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general description the max9775/max9776 combine a high-efficiency class d, stereo/mono audio power amplifier with a mono directdrive receiver amplifier and a stereo directdrive headphone amplifier. maxim? 3rd-generation, ultra-low-emi, class d audio power amplifiers provide class ab performance with class d efficiency. the max9775/max9776 deliver 1.5w per channel into a 4 load from a 5v supply and offer efficiencies up to 79%. active emissions limiting circuitry and spread-spectrum modulation greatly reduce emi, eliminating the need for output filtering found in traditional class d devices. the max9775/max9776 utilize a fully differential archi- tecture, a full-bridged output, and comprehensive click- and-pop suppression. a 3d stereo enhancement function allows the max9775 to widen the stereo sound field immersing the listener in a cleaner, richer sound experience than typically found in portable applications. the devices utilize a flexible, user-defined mixer archi- tecture that includes an input mixer, volume control, and output mixer. all control is done through i 2 c. the mono receiver amplifier and stereo headphone amplifier use maxim? directdrive architecture that pro- duces a ground-referenced output from a single supply, eliminating the need for large dc-blocking capacitors, saving cost, space, and component height. the max9775 is available in a 36-bump wlp (3mm x 3mm) package. the max9776 is available in a 32-pin tqfn (5mm x 5mm) or a 36-bump wlp (3mm x 3mm) package. both devices are specified over the extended -40? to +85? temperature range. applications cell phones portable multimedia players handheld gaming consoles features ? unique spread-spectrum modulation and active emissions limiting significantly reduces emi ? 3d stereo enhancement (max9775 only) ? up to 3 stereo inputs ? 1.5w stereo speaker output (4 , v dd = 5v) ? 50mw mono receiver/stereo headphone outputs (32, v dd = 3.3v) ? high psrr (68db at 217hz) ? 79% efficiency (v dd = 3.3v, r l = 8, p out = 470mw) ? i 2 c control?nput configuration, volume control, output mode ? click-and-pop suppression ? low total harmonic distortion (0.03% at 1khz) ? current-limit and thermal protection ? available in space-saving, 36-bump wlp (3mm x 3mm) and 32-pin tqfn (5mm x 5mm) packages max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ________________________________________________________________ maxim integrated products 1 ordering information max9775 mixer/ mux gain control 3d sound control i 2 c interface single supply 2.7v to 5.5v max9776 mixer/ mux gain control i 2 c interface single supply 2.7v to 5.5v simplified block diagrams 19-0746; rev 4; 8/08 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. pin configurations appear at end of data sheet. part pin-package class d amplifier max9775 ebx+t 36 wlp* stereo max9776 etj+ 32 tqfn-ep** mono max9776ebx+t 36 wlp* mono note: all devices are specified over the -40? to +85? oper- ating temperature range. + denotes a lead-free/rohs-compliant package. * four center bumps depopulated. ** ep = exposed pad. directdrive is a registered trademark of maxim integrated products, inc.
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v dd = pv dd = cpv dd = 3.3v, v gnd = v pgnd = v cpgnd = 0v, shdn = v dd , i 2 c settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise noted. c1 = c2 = c3 = 1?. t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v dd to gnd..............................................................................6v pv dd to pgnd .........................................................................6v cpv dd to cpgnd ....................................................................6v cpv ss to cpgnd .....................................................-6v to +0.3v v ss to cpgnd..........................................................-6v to +0.3v c1n .......................................(cpv ss - 0.3v) to (cpgnd + 0.3v) c1p.......................................(cpgnd - 0.3v) to (cpv dd + 0.3v) hpl, hpr to gnd...................(cpv ss - 0.3v) to (cpv dd + 0.3v) gnd to pgnd and cpgnd................................................?.3v v dd to pv dd and cpv dd ....................................................?.3v sda, scl to gnd.....................................................-0.3v to +6v all other pins to gnd..................................-0.3v to (v dd + 0.3v) continuous current in/out of pv dd , pgnd, cpv dd , cpgnd, out__, hpr, and hpl..................................................?00ma continuous input current cpv ss ......................................260ma continuous input current (all other pins) .........................?0ma duration of short circuit between out_+ and out_- ..................................................continuous duration of hp_, out_ short circuit to gnd or pv dd ..........................................................continuous continuous power dissipation (t a = +70?) 36-bump (3mm x 3mm) ucsp multilayer board (derate 17.0mw/? above +70?) ...........................1360.5mw 32-pin (5mm x 5mm) tqfn single-layer board (derate 21.3mw/? above +70?) ...........................1702.1mw 32-pin tqfn multilayer board (derate 34.5mw/? above +70?)...........................................................2758.6mw junction temperature ......................................................+150? operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units general supply voltage range v dd , p vdd , c pvdd inferred from psrr test 2.7 5.5 v output mode 1, 6, 11 (rx mode) 6.3 10 output mode 4, 9, 14 (hp mode) 8 12.6 output mode 2, 7, 12 (sp mode) 9.5 15 quiescent current (mono) i dd output mode 3, 8, 13 (sp and hp mode) 12.9 18 ma output mode 1, 6, 11 (rx mode) 7 output mode 4, 9, 14 (hp mode) 9 output mode 2, 7, 12 (sp mode) 16.5 quiescent current (stereo) i dd output mode 3, 8, 13 (sp and hp mode) 20 ma mute current i mute current in mute (low power) 4.7 10 ma hard shutdown shdn = gnd 0.1 10 shutdown current i shdn soft shutdown see the i 2 c interface section 8.5 15 ? turn-on time t on time from shutdown or power-on to full operation 30 ms b and c pair inputs, t a = +25?, vol = max 17.5 28 41.0 k input resistance r in a pair inputs, t a = +25c, +20db 3.5 5.5 8.0 k common-mode rejection ratio cmrr t a = +25?, f in = 1khz (note 2) 45 50 60 db input dc bias voltage v bias in_ inputs 1.12 1.25 1.38 v
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier _______________________________________________________________________________________ 3 parameter symbol conditions min typ max units speaker amplifiers t a = +25? ?.5 ?3.5 output offset voltage v os t min t a t max ?0 mv into shutdown -62 out of shutdown -60 into mute -63 click-and-pop level k cp p eak vol tag e, t a = + 25c , a- w ei g hted , 32 sam p l es p er second ( n otes 2, 3) out of mute -62 db v dd = 2.7v to 5.5v 48 70 f = 217hz, 100mv p-p ripple 68 f = 1khz, 100mv p-p ripple 60 power-supply rejection ratio (note 3) psrr t a = +25? f = 20khz, 100mv p-p ripple 50 db r l = 4 , v dd = 5v 1500 r l = 8 , v dd = 3.3v 450 output power (note 4) p out thd+n = 1%, t a = +25? r l = 8 , v dd = 5v 1115 mw current limit 1.6 a r l = 8 , p out = 125mw 0.03 total harmonic distortion plus noise (note 4) thd+n f = 1khz r l = 4 , p out = 250mw 0.04 % bw = 20hz to 20khz 81 signal-to-noise ratio snr v out = 1.8v rms , r l = 8 , 3d not active (note 3) a-weighted 84 db fixed-frequency modulation 1100 output frequency f osc spread-spectrum modulation 1100 ? 30 khz efficiency p out = 470mw, f = 1khz both channels driven, l = 68? in series with 8 load 79 % gain a v 12 db channel-to-channel gain tracking (note 5) t a = +25? ? % 3d sound resistors (note 5) r 3d used with 22nf and 2.2nf external capacitors 579k crosstalk (notes 4, 5) l to r, r to l, f = 10khz, r l = 8 , v out = 300mv rms 73 db electrical characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, v gnd = v pgnd = v cpgnd = 0v, shdn = v dd , i 2 c settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise noted. c1 = c2 = c3 = 1?. t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1)
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 4 _______________________________________________________________________________________ electrical characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, v gnd = v pgnd = v cpgnd = 0v, shdn = v dd , i 2 c settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise noted. c1 = c2 = c3 = 1?. t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units receiver amplifier output offset voltage v os t a = +25? ?.8 ?.5 mv into shutdown -62 into mute -67 out of shutdown -63 click-and-pop level k cp peak voltage, t a = +25?, a-weighted, 32 samples per second (notes 3, 6) out of mute -66 db v dd = 2.7v to 5.5v 58 80 f = 217hz, 100mv p-p ripple 80 f = 1khz, 100mv p-p ripple 70 power-supply rejection ratio (note 3) psrr t a = +25? f = 20khz, 100mv p-p ripple 62 db r l = 16 60 output power p out t a = +25?, thd+n = 1% r l = 32 50 mw gain a v 3db r l = 16 (v out = 800mv rms , f = 1khz) 0.03 total harmonic distortion plus noise thd+n r l = 32 (v out = 800mv rms , f = 1khz) 0.024 % bw = 20hz to 20khz 87 signal-to-noise ratio snr r l = 16 , v out = 800mv rms (note 3) a-weighted 89 db slew rate sr 0.3 v/? capacitive drive c l 300 pf headphone amplifiers output offset voltage v os t a = +25? ?.8 ?.5 mv into shutdown -61 into mute -65 out of shutdown -60 click-and-pop level k cp peak voltage, t a = +25?, a-weighted, 32 samples per second (notes 2, 4) out of mute -64 db contact ? esd protection hp_ air ? kv v dd = 2.7v to 5.5v 58 80 f = 217hz, 100mv p-p ripple 80 f = 1khz, 100mv p-p ripple 70 power-supply rejection ratio (note 3) psrr t a = +25? f = 20khz, 100mv p-p ripple 62 db
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier _______________________________________________________________________________________ 5 electrical characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, v gnd = v pgnd = v cpgnd = 0v, shdn = v dd , i 2 c settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise noted. c1 = c2 = c3 = 1?. t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units r l = 16 60 output power p out t a = +25?, thd+n = 1% r l = 32 50 mw current limit 170 ma gain a v +3 db channel-to-channel gain tracking t a = +25? ? % r l = 16 (v out = 800mv rms , f = 1khz) 0.03 total harmonic distortion plus noise thd+n r l = 32 (v out = 800mv rms , f = 1khz) 0.024 % bw = 20hz to 20khz 92 signal-to-noise ratio snr r l = 16 , v out = 800mv rms a-weighted 93 db slew rate sr 0.3 v/? capacitive drive c l 300 pf crosstalk l to r, r to l, f = 10khz, r l = 16 , v out = 160mv rms 75 db volume control hp gain (max) 3 sp gain (max) 12 hp gain (min) -72 in+6db = 0 (minimum gain setting) sp gain (min) -63 hp gain (max) 9 sp gain (max) 18 hp gain (min) -61 volume control in+6db = 1 (maximum gain setting) sp gain (min) -57 db mono+6db = 0 0 mono gain all outputs mono+6db = 1 6 db ina+20db = 0 (minimum gain setting) set by in+6db input pair a control ina+20db = 1 (maximum gain setting) 20 db mute attenuation (minimum volume) v in = 1v rms 80 db digital inputs ( shdn , sda, scl) input-voltage high v ih 1.4 v input-voltage low v il 0.4 v input hysteresis (sda, scl) v hys 200 mv
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 6 _______________________________________________________________________________________ electrical characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, v gnd = v pgnd = v cpgnd = 0v, shdn = v dd , i 2 c settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise noted. c1 = c2 = c3 = 1?. t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) parameter symbol conditions min typ max units sda, scl input capacitance c in 10 pf input leakage current i in 0.3 5.0 ? pulse width of spike suppressed t sp 50 ns digital outputs (sda open drain) output low voltage sda v ol i sink = 6ma 0.4 v output fall time sda t of v h(min) to v l(max) bus capacitance = 10pf to 400pf, i sink = 3ma 250 ns i 2 c interface timing (note 7) serial clock frequency f scl dc 400 khz bus free time between stop and start conditions t buf 1.3 ? start condition hold t hd:sta 0.6 ? stop condition setup time t su:sta 0.6 ? clock low period t low 1.3 ? clock high period t high 0.6 ? data setup time t su:dat 100 ns data hold time t hd:dat 0 900 ns maximum receive scl/sda rise time t r 300 ns maximum receive scl/sda fall time t f 300 ns setup time for stop condition t su:sto 0.6 ? capacitive load for each bus line c b 400 pf note 1: all devices are 100% production tested at room temperature. all temperature limits are guaranteed by design. note 2: measured at headphone outputs. note 3: amplifier inputs ac-coupled to gnd. note 4: testing performed with a resistive load in series with an inductor to simulate an actual speaker load. for r l = 8 , l = 68?; for r l = 4 , l = 47?. note 5: max9775 only. note 6: testing performed at room temperature with an 8 resistive load in series with a 68? inductive load connected across btl outputs for speaker amplifier. testing performed with a 32 resistive load connected between out_ and gnd for head- phone amplifier. testing performed with 32 resistive load connected between outrx and gnd for mono receiver amplifi- er. mode transitions are controlled by i 2 c. note 7: guaranteed by design.
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier _______________________________________________________________________________________ 7 total harmonic distortion plus noise vs. frequency max9775/76 toc01 frequency (hz) thd+n (%) 10k 1k 100 0.1 0.001 0.01 1 10 100k v dd = 5v r l = 4 p out = 400mw p out = 1000mw total harmonic distortion plus noise vs. frequency max9775/76 toc02 frequency (hz) thd+n (%) 10k 1k 100 0.1 0.001 0.01 1 10 100k v dd = 5v r l = 8 p out = 150mw p out = 750mw total harmonic distortion plus noise vs. frequency max9775/76 toc03 frequency (hz) thd+n (%) 10k 1k 100 0.1 0.001 0.01 1 10 100k v dd = 3.3v r l = 4 p out = 400mw p out = 150mw total harmonic distortion plus noise vs. frequency max9775/76 toc04 frequency (hz) thd+n (%) 10k 1k 100 0.1 0.001 0.01 1 10 100k v dd = 3.3v r l = 8 p out = 300mw p out = 150mw total harmonic distortion plus noise vs. frequency max9775/76 toc05 frequency (hz) thd+n (%) 10k 1k 100 0.01 0.1 1 0.001 10 100k ssm ffm v dd = 3.3v r l = 8 p out = 500mw total harmonic distortion plus noise vs. output power max9775/76 toc06 output power (w) thd+n (%) 1.6 1.2 0.8 0.4 0.01 0.1 1 10 100 0.001 0 2.0 v dd = 5v r l = 4 f = 10khz f = 20hz f = 1khz typical operating characteristics (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.)
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) total harmonic distortion plus noise vs. output power max9775/76 toc07 output power (w) thd+n (%) 1.2 0.9 0.6 0.3 0.01 0.1 1 10 100 0.001 0 1.5 v dd = 5v r l = 8 f = 10khz f = 20hz f = 1khz total harmonic distortion plus noise vs. output power max9775/76 toc08 output power (w) thd+n (%) 0.6 0.4 0.2 0.01 0.1 1 10 100 0.001 0 0.8 v dd = 3.3v r l = 4 f = 10khz f = 20hz f = 1khz total harmonic distortion plus noise vs. output power max9775/76 toc09 output power (w) thd+n (%) 0.4 0.2 0.01 0.1 1 10 100 0.001 0 0.6 v dd = 3.3v r l = 8 f = 10khz f = 20hz f = 1khz total harmonic distortion plus noise vs. output power max9775/76 toc10 output power (w) thd+n (%) 1.2 0.9 0.6 0.3 0.01 0.1 1 10 100 0.001 0 1.5 v dd = 5v r l = 8 f = 1khz ssm ffm efficiency vs. output power max9775/76 toc11 output power (w) efficiency (%) 3.2 2.4 1.6 0.8 10 20 30 40 50 60 70 80 90 100 0 0 4.0 v dd = 5v f in = 1khz p out = p outl + p outr r l = 8 r l = 4 efficiency vs. output power max9775/76 toc12 output power (w) efficiency (%) 1.6 1.2 0.8 0.4 10 20 30 40 50 60 70 80 90 100 0 0 2.0 v dd = 3.3v f in = 1khz p out = p outl + p outr r l = 8 r l = 4
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier _______________________________________________________________________________________ 9 typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) output power vs. supply voltage max9775/76 toc13 supply voltage (v) output power (mw) 5.2 4.7 4.2 3.7 3.2 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 0 2.7 r l = 4 f = 1khz thd+n = 10% thd+n = 1% output power vs. supply voltage max9775/76 toc14 supply voltage (v) output power (mw) 5.2 4.7 3.2 3.7 4.2 200 400 600 800 1000 1200 1400 1600 0 2.7 r l = 8 f = 1khz thd+n = 10% thd+n = 1% output power vs. load max9775/76 toc15 load ( ) output power (w) 10 0.5 1.0 1.5 2.0 2.5 0 1 100 thd+n = 10% thd+n = 1% v dd = 5v f = 1khz output power vs. load max9775/76 toc16 load ( ) output power (w) 10 200 400 600 800 1000 0 1 100 thd+n = 10% thd+n = 1% v dd = 3.3v f = 1khz power-supply rejection ratio vs. frequency max9775/76 toc17 frequency (hz) power-supply rejection ratio (db) 10k 1k 100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 -100 10 100k outr outl v dd = 3.3v v in = 100mv p-p r l = 8 crosstalk vs. frequency frequency (hz) crosstalk (db) max9775/6 toc18 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k left to right right to left out_ = 1v p-p r l = 8
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 10 ______________________________________________________________________________________ typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) crosstalk vs. input amplitude input amplitude (v rms ) crosstalk (db) max9775/6 toc19 0 0.1 0.2 0.3 0.4 0.5 0.6 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 f in = 1khz r l = 8 gain = +12db left to right right to left in-band output spectrum max9775/76 toc20 frequency (hz) output magnitude (dbv) 15k 10k 5k -120 -100 -80 -60 -40 -20 0 20 -140 0 20k ssm mode r l = 8 v dd = 3.3v f in = 1khz unweighted in-band output spectrum max9775/76 toc21 frequency (hz) output magnitude (dbv) 15k 10k 5k -120 -100 -80 -60 -40 -20 0 20 -140 0 20k ffm mode r l = 8 v dd = 3.3v f in = 1khz unweighted wideband output spectrum fixed-frequency mode frequency (mhz) output magnitude (dbv) max9775/6 toc22 -140 -120 -100 -80 -60 -40 -20 0 20 0.1 1 10 100 1000 v dd = 5v r l = 8 inputs ac grounded wideband output spectrum spread-spectrum mode frequency (mhz) output magnitude (dbv) max9775 toc23 -140 -120 -100 -80 -60 -40 -20 0 20 0.1 1 10 100 1000 v dd = 5v r l = 8 inputs ac grounded max9775 supply current vs. supply voltage max9775/76 toc24 supply voltage (v) supply current (ma) 5.2 4.7 4.2 3.7 3.2 15 20 25 10 2.7 sp mode inputs ac grounded outputs unloaded
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 11 typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) max9776 supply current vs. supply voltage max9775/76 toc25 supply voltage (v) supply current (ma) 5.2 4.7 4.2 3.7 3.2 6 8 10 12 14 16 4 2.7 sp mode inputs ac grounded outputs unloaded shutdown supply current vs. supply voltage max9775/76 toc26 supply voltage (v) supply current (na) 5.2 4.7 4.2 3.7 3.2 10 20 30 40 50 60 70 80 90 100 0 2.7 total harmonic distortion plus noise vs. frequency max9775/76 toc27 frequency (hz) thd+n (%) 10k 1k 100 0.01 0.1 1 0.001 10 100k v dd = 5v r l = 32 p out = 20mw p out = 40mw total harmonic distortion plus noise vs. frequency max9775/76 toc28 frequency (hz) thd+n (%) 10k 1k 100 0.01 0.1 1 0.001 10 100k v dd = 3.3v r l = 16 p out = 20mw p out = 40mw total harmonic distortion plus noise vs. frequency max9775/76 toc29 frequency (hz) thd+n (%) 10k 1k 100 0.01 0.1 1 0.001 10 100k v dd = 3.3v r l = 32 p out = 10mw p out = 40mw total harmonic distortion plus noise vs. output power max9775/76 toc30 output power (mw) thd+n (%) 60 40 20 0.01 0.1 1 10 100 0.001 080 v dd = 5v r l = 32 f = 10khz f = 20hz f = 1khz
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 12 ______________________________________________________________________________________ typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) total harmonic distortion plus noise vs. output power output power (mw) thd+n (%) max9775 toc31 0 30 60 90 120 0.001 0.01 0.1 1 10 100 f = 20hz f = 1khz f = 10khz v dd = 3.3v r l = 16 total harmonic distortion plus noise vs. output power max9775/76 toc32 output power (mw) thd+n (%) 60 40 20 0.01 0.1 1 10 100 0.001 080 v dd = 3.3v r l = 32 f = 10khz f = 20hz f = 1khz total harmonic distortion plus noise vs. common-mode voltage common-mode voltage (v) thd+n (%) max9775/6 toc33 0 0.5 1.0 1.5 2.0 2.5 0.001 0.01 0.1 1 10 100 v dd = 3.3v f in = 1khz p out = 30mw gain = +3db r l = 32 power dissipation vs. output power max9775/76 toc34 total output power (mw) power dissipation (mw) 80 40 50 100 150 200 250 300 350 400 450 500 0 0 120 v dd = 5v f = 1khz r l = 32 p out = p outr + p outl power dissipation vs. output power max9775/76 toc35 total output power (mw) power dissipation (mw) 120 80 40 50 100 150 200 250 300 350 400 450 500 0 0 160 v dd = 3.3v f = 1khz p out = p outr + p outl r l = 16 r l = 32 output power vs. supply voltage max9775/76 toc36 supply voltage (v) output power (mw) 5.2 4.7 4.2 3.7 3.2 35 40 45 50 55 60 65 30 2.7 thd+n = 10% thd+n = 1% r l = 32 f = 1khz
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 13 typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) output power vs. load max9775/76 toc37 load ( ) output power (mw) 100 20 40 60 80 100 120 140 160 180 200 0 10 1000 thd+n = 10% thd+n = 1% v dd = 5v f = 1khz output power vs. load max9775/76 toc38 load ( ) output power (mw) 100 20 40 60 80 100 120 140 160 180 200 0 10 1000 thd+n = 10% thd+n = 1% v dd = 3.3v f = 1khz output power vs. load resistance and charge-pump capacitor size load ( ) output power (mw) max9775/6 toc39 0 20 40 60 80 100 10 100 1000 c1 = c2 = 2.2 f v dd = 3.3v f = 1khz thd+n = 1% c1 = c2 = 1 f c1 = c2 = 0.68 f power-supply rejection ratio vs. frequency frequency (hz) power-supply rejection ratio (db) max9775/6 toc40 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k hpl hpr v dd = 3.3v v in = 100mv p-p r l = 32 output frequency spectrum max9775/76 toc41 frequency (hz) output magnitude (dbv) 15k 10k 5k -120 -100 -80 -60 -40 -20 0 20 -140 0 20k v dd = 3.3v f = 1khz r l = 32 crosstalk vs. frequency frequency (hz) crosstalk (db) max9775/6 toc42 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 100 1k 10k 100k out_ = 1v p-p r l = 32 left to right right to left
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 14 ______________________________________________________________________________________ typical operating characteristics (continued) (v dd = pv dd = cpv dd = 3.3v, gnd = pgnd = cpgnd = 0v, shdn = v dd , i 2 c default gain settings (ina gain = +20db, inb gain = inc gain = 0db, volume setting = 0db, mono path gain = 0db, shdn = 1, ssm = 1). speaker load resistors (r lsp ) are terminated between out_+ and out_-, headphone load resistors are terminated to gnd, unless otherwise stated. c1 = c2 = c3 = 1?. t a = +25?, unless otherwise noted.) crosstalk vs. input amplitude input amplitude (v rms ) crosstalk (db) max9775 toc43 0 0.4 0.8 1.2 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 f in = 1khz r l = 32 gain = +3db left to right right to left turn-on response max9775/76 toc44 10ms/div scl 2v/div speaker output 50ma/div headphone output 2v/div turn-off response max9775/76 toc45 10ms/div scl 2v/div speaker output 50ma/div headphone output 2v/div mute-on response max9775/76 toc46 10ms/div scl 2v/div speaker output 50ma/div headphone output 2v/div mute-off response max9775/76 toc47 10ms/div scl 2v/div speaker output 50ma/div headphone output 2v/div
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 15 pin description?ax9775 pin name function f1 pv dd class d power supply e1 outl- negative left-speaker output d2 scl serial clock input. connect a 1k pullup resistor from scl to v dd . d1, f3 pgnd power ground c1 outl+ positive left-speaker output c2 sda serial data input. connect a 1k pullup resistor from sda to v dd . b1 cl_l 3d external capacitor 3. connect a 2.2nf capacitor to gnd. b2 cl_h 3d external capacitor 4. connect a 22nf capacitor to gnd. a1 cpv dd charge-pump power supply a2 c1p charge-pump flying capacitor positive terminal b3 vbias common-mode bias a3 cpgnd charge-pump gnd a4 c1n charge-pump flying capacitor negative terminal b4 inc1 input c1. left input or positive input (see table 5a). a5 cpv ss charge-pump output. connect to v ss . a6 hpl left headphone output b5 v ss headphone amplifier negative power supply. connect to cpv ss . b6 hpr right headphone output c5 inc2 input c2. right input or negative input (see table 5a). c6 outrx mono receiver output d6 v dd analog power supply d5 inb2 input b2. right input or negative input (see table 5a). e6 cr_l 3d external capacitor 1. connect a 2.2nf capacitor to gnd. e5 inb1 input b1. left input or positive input (see table 5a). f6 gnd analog ground f5 cr_h 3d external capacitor 2. connect a 22nf capacitor to gnd. e4 ina2 input a2. right input or negative input (see table 5a). f4 outr+ positive right speaker output e3 ina1 input a1. left input or positive input (see table 5a). f2 outr- negative right speaker output e2 shdn active-low hardware shutdown ?p exposed pad. the external pad lowers the package? thermal impedance by providing a direct heat conduction path from the die to the pcb. the exposed pad is internally connected to gnd. connect the exposed thermal pad to the gnd plane.
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 16 ______________________________________________________________________________________ pin description?ax9776 pin tqfn ucsp name function 1f1pv dd class d power supply 2 e1 out- negative left-speaker output 3 d2 scl serial clock input. connect a 1k pullup resistor from scl to v dd . 4, 29 d1, f3 pgnd power ground 5 c1 out+ positive left-speaker output 6 c2 sda serial data input. connect a 1k pullup resistor from sda to v dd . 7, 8, 23, 26, 28, 31 b1, b2, e6, f2, f4, f5 i.c. internal connection. leave unconnected. this pin is internally connected to the signal path. do not connect together or to any other pin. 9 a1 cpv dd charge-pump power supply 10 a2 c1p charge-pump flying capacitor positive terminal 11 b3 vbias common-mode bias 12 a3 cpgnd charge-pump gnd 13 a4 c1n charge-pump flying capacitor negative terminal 14 b4 inc1 input c1. left input or positive input (see table 5a). 15 a5 cpv ss charge-pump output. connect to v ss . 16 a6 hpl left headphone output 17 b5 v ss headphone amplifier negative power supply. connect to cpv ss . 18 b6 hpr right headphone output 19 c5 inc2 input c2. right input or negative input (see table 5a). 20 c6 outrx mono receiver output 21 d6 v dd analog power supply 22 d5 inb2 input b2. right input or negative input (see table 5a). 24 e5 inb1 input b1. left input or positive input (see table 5a). 25 f6 gnd analog ground 27 e4 ina2 input a2. right input or negative input (see table 5a). 30 e3 ina1 input a1. left input or positive input (see table 5a). 32 e2 shdn active-low hardware shutdown ep ep exposed pad. the external pad lowers the package? thermal impedance by providing a direct heat conduction path from the die to the pcb. the exposed pad is internally connected to gnd. connect the exposed thermal pad to the gnd plane.
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 17 typical application circuits max9775 charge pump v dd c1 1 f 10k c3 1 f 13 (a4) 12 (a3) 10 (a2) 9 (a1) c1n vbias cpgnd input a: 0db, 6db, or 20db c1p 30 (e3) 27 (e4) 1 f 1 f cpv dd 1 f 6 (c2) 3 (d2) ina2 ina1 input b: 0db or 6db maxim 3d sound 24 (e5) 22 (d5) 1 f 1 f inb2 inb1 class d amplifier input c: 0db or 6db 14 (b4) 19 (c5) 1 f 1 f inc2 inc1 input mixer output mixer right volume left volume mono volume 11 (b3) 32 (e2) sda scl shdn i 2 c control 3db 3db 3db directdrive 12db class d amplifier 12db outr- outrx hpr outr+ cl_h 22nf outl- outl+ hpl 31 (f2) 20 (c6) 18 (b6) 28 (f4) 2 (e1) 5 (c1) 16 (a6) 3d circuit 8 (b2) cl_l 2.2nf 7 (b1) cr_h 22nf 26 (f5) cr_l 2.2nf 23 (e6) 25 (f6) gnd 4 (d1) 29 (f3) pgnd pgnd c2 1 f 15 (a5) 17 (b5) cpv ss v ss 1 f 21 (d6) v dd v dd 1 f 0.1 f 1 (f1) pv dd v dd
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 18 ______________________________________________________________________________________ typical application circuits (continued) max9776 charge pump v dd c1 1 f c3 1 f 13 (a4) 12 (a3) 10 (a2) 9 (a1) c1n vbias cpgnd input a: 0db, 6db, or 20db c1p 30 (e3) 27 (e4) 1 f 1 f cpv dd 1 f 6 (c2) 3 (d2) ina2 ina1 input b: 0db or 6db 24 (e5) 22 (d5) 1 f 1 f inb2 inb1 class d amplifier input c: 0db or 6db 14 (b4) 19 (c5) 1 f 1 f inc2 inc1 input mixer output mixer right volume left volume mono volume 11 (b3) 32 (e2) sda scl shdn i 2 c control 3db 3db 3db directdrive 12db outrx hpr out- out+ hpl 20 (c6) 18 (b6) 2 (e1) 5 (c1) 16 (a6) 25 (f6) gnd 4 (d1) 29 (f3) pgnd pgnd c2 1 f 15 (a5) 17 (b5) cpv ss v ss 1 f 21 (d6) v dd v dd 1 f 0.1 f 1 (f1) pv dd v dd 10k
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 19 out+ out- v in- v in+ v out+ - v out- t on(min) t sw detailed description the max9775/max9776 ultra-low-emi, filterless, class d audio power amplifiers feature several improvements to switch-mode amplifier technology. the max9775/ max9776 feature active emissions limiting circuitry to reduce emi. zero dead-time technology maintains state- of-the-art efficiency and thd+n performance by allowing the output fets to switch simultaneously without cross- conduction. a unique filterless modulation scheme and spread-spectrum modulation create compact, flexible, low-noise, efficient audio power amplifiers while occupying minimal board space. the differential input architecture reduces common-mode noise pickup with or without the use of input-coupling capacitors. the max9775/max9776 can also be configured as single- ended input amplifiers without performance degradation. the max9775/max9776 feature three fully differential input pairs (ina_, inb_, inc_) that can be configured as stereo single-ended or mono differential inputs. i 2 c provides control for input configuration, volume level, and mixer configuration. the max9775? 3d enhance- ment feature widens the stereo sound field to improve stereo imaging when stereo speakers are placed in close proximity. directdrive allows the headphone and mono receiver amplifiers to output ground-referenced signals from a single supply, eliminating the need for large dc-block- ing capacitors. comprehensive click-and-pop suppres- sion minimizes audible transients during the turn-on and turn-off of amplifiers. class d speaker amplifier comparators monitor the audio inputs and compare the complementary input voltages to a sawtooth waveform. the comparators trip when the input magnitude of the sawtooth exceeds their corresponding input voltage. the active emissions limiting circuitry slightly reduces the turn-on rate of the output h-bridge by slew-rate limiting the comparator output pulse. both comparators reset at a fixed time after the rising edge of the second compara- tor trip point, generating a minimum-width pulse (t on(min) ,100ns typ) at the output of the second com- parator (figure 1). as the input voltage increases or decreases, the duration of the pulse at one output increases while the other output pulse duration remains the same. this causes the net voltage across the speak- er (v out+ - v out- ) to change. the minimum-width pulse helps the devices to achieve high levels of linearity. figure 1. outputs with an input signal applied
max9775/max9776 operating modes fixed-frequency modulation the max9775/max9776 feature a fixed-frequency modulation mode with a 1.1mhz switching frequency, set through the i 2 c interface (table 2). in fixed-frequen- cy modulation mode, the frequency spectrum of the class d output consists of the fundamental switching frequency and its associated harmonics (see the wideband output spectrum fixed-frequency mode graph in the typical operating characteristics ). spread-spectrum modulation the max9775/max9776 feature a unique spread-spec- trum modulation that flattens the wideband spectral com- ponents. proprietary techniques ensure that the cycle-to-cycle variation of the switching period does not degrade audio reproduction or efficiency (see the typical operating characteristics ). select spread-spec- trum modulation mode through the i 2 c interface (table 2). in spread-spectrum modulation mode, the switching frequency varies randomly by 30khz around the center frequency (1.16mhz). the modulation scheme remains the same, but the period of the sawtooth waveform changes from cycle to cycle (figure 2). instead of a large amount of spectral energy present at multiples of the switching frequency, the energy is now spread over a bandwidth that increases with frequency. above a few megahertz, the wideband spectrum looks like white noise for emi purposes (see figure 3). 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 20 ______________________________________________________________________________________ v out+ - v out- t sw t sw t sw t sw v in- v in+ out+ out- t on(min) figure 2. output with an input signal applied (spread-spectrum modulation mode)
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 21 frequency (mhz) amplitude (db v/m) 40.0 30.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0 220.0 240.0 260.0 280.0 300.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 en55022b limit figure 3. emi with 76mm of speaker cable
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 22 ______________________________________________________________________________________ filterless modulation/common-mode idle the max9775/max9776 use maxim? unique modula- tion scheme that eliminates the lc filter required by tra- ditional class d amplifiers, improving efficiency, reducing component count, conserving board space and system cost. conventional class d amplifiers out- put a 50% duty-cycle square wave when no signal is present. with no filter, the square wave appears across the load as a dc voltage, resulting in finite load current, increasing power consumption, especially when idling. when no signal is present at the input of the max9775/max9776, the outputs switch as shown in figure 4. because the max9775/max9776 drive the speaker differentially, the two outputs cancel each other, resulting in no net idle mode voltage across the speaker, minimizing power consumption. directdrive traditional single-supply headphone amplifiers have outputs biased at a nominal dc voltage (typically half the supply) for maximum dynamic range. large cou- pling capacitors are needed to block this dc bias from the headphone. without these capacitors, a significant amount of dc current flows to the headphone, resulting in unnecessary power dissipation and possible dam- age to both headphone and headphone amplifier. maxim? directdrive architecture uses a charge pump to create an internal negative supply voltage. this allows the headphone outputs of the max9775/max9776 to be biased at gnd, almost doubling dynamic range while operating from a single supply. with no dc component, there is no need for the large dc-blocking capacitors. instead of two large (220?, typ) tantalum capacitors, the max9775/max9776 charge pump requires two small ceramic capacitors, conserving board space, reducing cost, and improving the frequency response of the head- phone amplifier. see the output power vs. load resistance and charge-pump capacitor size graph in the typical operating characteristics for details of the possible capacitor sizes. there is a low dc voltage on the amplifier outputs due to amplifier offset. however, the offset of the max9775/max9776 is typically 1.4mv, which, when combined with a 32 load, results in less than 44na of dc current flow to the headphones. in addition to the cost and size disadvantages of the dc-blocking capacitors required by conventional head- phone amplifiers, these capacitors limit the amplifier? low-frequency response and can distort the audio sig- nal. previous attempts at eliminating the output-cou- pling capacitors involved biasing the headphone return (sleeve) to the dc bias voltage of the headphone amplifiers. this method raises some issues: 1) the sleeve is typically grounded to the chassis. using the midrail biasing approach, the sleeve must be isolated from system ground, complicating prod- uct design. 2) during an esd strike, the driver? esd structures are the only path to system ground. thus, the amplifier must be able to withstand the full esd strike. 3) when using the headphone jack as a lineout to other equipment, the bias voltage on the sleeve may conflict with the ground potential from other equip- ment, resulting in possible damage to the amplifiers. v in = 0v out- out+ v out+ - v out- = 0v figure 4. outputs with no input signal
charge pump the max9775/max9776 feature a low-noise charge pump. the switching frequency of the charge pump is half the switching frequency of the class d amplifier, regardless of the operating mode. the nominal switch- ing frequency is well beyond the audio range, and thus does not interfere with the audio signals, resulting in an snr of 93db. although not typically required, addition- al high-frequency noise attenuation can be achieved by increasing the size of c2 (see the typical application circuits ). the charge pump is active in both speaker and headphone modes. 3d enhancement the max9775 features a 3d stereo enhancement func- tion, allowing the max9775 to widen the stereo sound field and immerse the listener in a cleaner, richer sound experi- ence. note the max9776, mono class d speaker amplifier does not feature 3d stereo enhancement. as stereo speaker applications become more compact, the quality of stereophonic sound is jeopardized. with maxim? 3d stereo enhancement, it is possible to emulate stereo sound in situations where the speakers must be positioned close together. as shown in figure 6, wave interference can be used to cancel the left channel in the vicinity of the listener? right ear and vice versa. this technique can yield an apparent separation between the speakers that is a factor of four or greater than the actual physical separation. the external capacitors cl_l, cl_h, cr_l, and cr_h set the starting and stopping range of the 3d effect. cl_h and cr_h are for the lower limit (in the max9775 typical application circuit , it is 1khz), cr_l and cl_l are for the higher limit (10khz). the internal resistor is typically 7k and the frequencies are calculated as: where r = 7k and c = cr_h and cl_h. where r = 7k and c = cr_l and cl_l. for example, with cr_l = cl_l = 2.2nf and cr_h = cl_h = 22nf, the 3d start frequency is 1khz and the 3d stop frequency is 10khz. enabling the 3d sound effect results in an apparent 6db gain because the internal left and right signals are mixed together. this gain can be nulled by volume adjusting the left and right signals. the volume control can be pro- grammed through the i 2 c-compatible interface to com- pensate for the extra 6db increase in gain. for example, 3 1 2 d stop rc _ = 3 1 2 d start rc _ = max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 23 v dd / 2 v dd gnd +v dd -v dd gnd v out v out conventional driver-biasing scheme directdrive biasing scheme figure 5. traditional amplifier output vs. max9775/max9776 directdrive output + + d q r i l i r q l right left right left listener figure 6. max9775 3d stereo enhancement
max9775/max9776 if the right and left volume controls are set for a maxi- mum gain 0db (11111 in table 7, in+6db = 0 from table 10) before the 3d effect is activated, the volume control should be programmed to -6db (11001 in table 7) immediately after the 3d effect has been activated. signal path the audio inputs of the max9775/max9776?na, inb, and inc?re preamplified and then mixed by the input mixer to create three internal signals: left (l), right (r), and mono (m). tables 5a and 5b show how the inputs are mixed to create l, r, and m. these signals are then independently volume adjusted by the l, r, and m vol- ume control and routed to the output mixer. the output mixer mixes the internal l, r, and m signals to create a variety of audio mixes that are output to the headphone speaker and mono receiver amplifiers. figure 6 shows the signal path that the audio signals take. signal amplification takes place in three stages. in the first stage, the inputs (ina, inb, and inc) are pre- amplified. the amount by which each input is amplified is determined by the bits ina+20db (b4 in the input mode control register) and in+6db (b3 in the global control register). after preamplification, they are mixed in the input mixer to create the internal signals l, r, and m. in the second stage of amplification, the internal l, r, and m signals are independently volume adjusted. finally, each output amplifier has its own internal gain. the speaker, headphone, and mono receiver amplifiers have fixed gains of 12db, 3db, and 3db, respectively. current-limit and thermal protection the max9775/max9776 feature current limiting and thermal protection to protect the device from short cir- cuits and overcurrent conditions. the headphone amplifier pulses in the event of an overcurrent condition with a pulse every 100? as long as the condition is present. should the current still be high, the above cycle is repeated. the speaker amplifier current-limit protection clamps the output current without shutting down the output. this can result in a distorted output. current is limited to 1.6a in the speaker amplifiers and 170ma in the headphone and mono receiver amplifiers. the max9775/max9776 have thermal protection that disables the device at +150? until the temperature decreases to +120?. 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 24 ______________________________________________________________________________________ input mixer input preamplifier input a: 0db, 6db, 20db -75db to 0db -75db to 0db 0db to 6db mvol mono+6db lvol -75db to 0db rvol input b and c: 0db, 6db output mixer 3db 3db 12db speaker headphone receiver mono figure 7. signal path
click-and-pop suppression in conventional single-supply headphone amplifiers, the output-coupling capacitor is a major contributor of audi- ble clicks and pops. upon startup, the amplifier charges the coupling capacitor to its bias voltage, typically half the supply. likewise, during shutdown, the capacitor is dis- charged to gnd. this results in a dc shift across the capacitor, which, in turn, appears as an audible transient at the speaker. since the max9775/max9776 headphone amplifier does not require output-coupling capacitors, this problem does not arise. in most applications, the output of the preamplifier dri- ving the max9775/max9776 has a dc bias of typically half the supply. during startup, the input-coupling capacitor is charged to the preamplifier? dc bias volt- age, resulting in a dc shift across the capacitor and an audible click/pop. an internal delay of 30ms eliminates the click/pop caused by the input filter. shutdown the max9775/max9776 feature a 0.1? hard shutdown mode that reduces power consumption to extend battery life and a soft shutdown where current consumption is typically 8.5?. hard shutdown is controlled by connect- ing the shdn pin to gnd, disabling the amplifiers, bias circuitry, charge pump, and i 2 c. in shutdown, the head- phone amplifier output impedance is 1.4k and the speaker output impedance is 300k . similarly, the max9775/max9776 enter soft-shutdown when the shdn bit = 0 (see table 2). the i 2 c interface is active and the contents of the command register are not affected when in soft-shutdown. this allows the master to write to the max9775/max9776 while in shutdown. the i 2 c interface is completely disabled in hardware shutdown. when the max9775/max9776 are re-enabled the default settings are applied (see table 3). i 2 c interface the max9775/max9776 feature an i 2 c 2-wire serial interface consisting of a serial data line (sda) and a serial clock line (scl). sda and scl facilitate commu- nication between the max9775/max9776 and the mas- ter at clock rates up to 400khz. figure 8 shows the 2-wire interface timing diagram. the max9775/ max9776 are receive-only slave devices relying on the master to generate the scl signal. the master, typical- ly a microcontroller, generates scl and initiates data transfer on the bus. the max9775/max9776 cannot write to the sda bus except to acknowledge the receipt of data from the master. the max9775/max9776 will not acknowledge a read command from the master. a master device communicates to the max9775/ max9776 by transmitting the proper address followed by the data word. each transmit sequence is framed by a start (s) or repeated start (sr) condition and a stop (p) condition. each word transmitted over the bus is 8 bits long and is always followed by an acknowledge clock pulse. the max9775/max9776 sda line operates as both an input and an open-drain output. a pullup resistor, greater than 500 , is required on the sda bus. the max9775/max9776 scl line operates as an input only. a pullup resistor (greater than 500 ) is required on scl if there are multiple masters on the bus or if the master in a single-master system has an open-drain scl output. series resistors in line with sda and scl are optional. series resistors protect the digital inputs of the max9775/max9776 from high-voltage spikes on the bus lines, and minimize crosstalk and undershoot of the bus signals. max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 25 scl sda start condition stop condition repeated start condition start condition t hd, sta t su, sta t hd, sta t sp t buf t su, sto t low t su, dat t hd, dat t high t r t f figure 8. 2-wire serial-interface timing diagram
max9775/max9776 bit transfer one data bit is transferred during each scl cycle. the data on sda must remain stable during the high period of the scl pulse. changes in sda while scl is high are control signals (see the start and stop conditions section). sda and scl idle high when the i 2 c bus is not busy. start and stop conditions a master device initiates communication by issuing a start condition. a start condition is a high-to-low transition on sda with scl high. a stop condition is a low-to-high transition on sda while scl is high (figure 9). a start (s) condition from the master signals the beginning of a transmission to the max9775/max9776. the master terminates transmission, and frees the bus, by issuing a stop (p) condition. the bus remains active if a repeated start (sr) condition is generated instead of a stop condition. early stop conditions the max9775/max9776 recognize a stop condition at any point during data transmission except if the stop condition occurs in the same high pulse as a start condition. slave address the max9775/max9776 are available with one preset slave address (see table 1). the address is defined as the seven most significant bits (msbs) followed by the read/ write bit. the address is the first byte of informa- tion sent to the max9775/max9776 after the start condition. the max9775/max9776 are slave devices only capable of being written to. the read/ write bit should be a zero when configuring the max9775/ max9776. acknowledge the acknowledge bit (ack) is a clocked 9th bit that the max9775/max9776 use to handshake receipt of each byte of data (see figure 10). the max9775/max9776 pull down sda during the master-generated 9th clock pulse. monitoring ack allows for detection of unsuc- cessful data transfers. an unsuccessful data transfer occurs if a receiving device is busy or if a system fault has occurred. in the event of an unsuccessful data transfer, the bus master may reattempt communications. 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 26 ______________________________________________________________________________________ scl sda ssrp figure 9. start, stop, and repeated start conditions 1 scl start condition sda 289 clock pulse for acknowledgment acknowledge not acknowledge slave address part a6 a5 a4 a3 a2 a1 a0 r/ w max9775 1 0 0 1 1 0 0 0 max9776 1 0 0 1 1 0 1 0 figure 10. acknowledge table 1. max9775/max9776 address map
write data format a write to the max9775/max9776 includes transmis- sion of a start condition, the slave address with the r/ w bit set to 0 (table 1), one byte of data to configure the command register, and a stop condition. figure 11 illustrates the proper format for one frame. the max9775/max9776 only accept write data, but they acknowledge the receipt of the address byte with the r/ w bit set high. the max9775/max9776 do not write to the sda bus in the event that the r/ w bit is set high. subsequently, the master reads all 1? from the max9775/max9776. always set the r/ w bit to zero to avoid this situation. programming the max9775/max9776 the max9775/max9776 are programmed through 6 control registers. each register is addressed by the 3 msbs (b5?7) followed by 5 configure bits (b0?4) as shown in table 2. correct programming of the max9775/max9776 requires writing to all 6 control reg- isters. upon power-on, their default settings are as list- ed in table 3. max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 27 s ack 0 acknowledge from max9775/max9776 r/w acknowledge from max9775/max9776 b7 b6 b5 b4 b3 b2 command byte is stored on receipt of stop condition ack p b1 b0 slave address command byte figure 11. write data format example b7 b6 b5 b4 b3 b2 b1 b0 function command data input mode control 0 0 0 ina+20db inmode (tables 5a and 5b) mono volume control 0 0 1 mvol (table 7) left volume control 0 1 0 lvol (table 7) right volume control 0 1 1 rvol (table 7) output mode control 1 0 0 mono+6db outmode (table 9) global control register 1 0 1 shdn in+6db mute ssm 3d/mono table 2. control registers command data description input mode (000) 10000 input a gain = +20db; input a, b, and c singled-ended stereo inputs mono volume (001) 11111 maximum volume left volume (010) 11111 maximum volume right volume (011) 11111 maximum volume output mode (100) 01000 0db of extra mono gain, mode 8: stereo headphone, stereo speaker global control register (101) 00011 powered-off, input b/c gain = 0db, mute off, ssm on, 3d/mono on table 3. power-on reset conditions
max9775/max9776 the max9775/max9776 have three flexible inputs that can be configured as single-ended stereo inputs or dif- ferential mono inputs. all input signals are summed into three unique signals?eft (l), right (r), and mono (m)?hich are routed to the output amplifiers. the bit ina+20db allows the option of boosting low-level sig- nals on ina. ina+20db can be set as follows: 1 = input a? gain +20db for low-level signals such as fm receivers. 0 = input a? gain is either 0db or +6db as set by in+6db (bit b3 of the control register). tables 5a and 5b show how the inputs?na, inb, and inc?re mixed to create the internal signals left (l), right (r), and mono (m). 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 28 ______________________________________________________________________________________ input mode control register b7 b6 b5 b4 b3 b2 b1 b0 input mode control 0 0 0 ina+20db inmode (tables 5a and 5b ) table 4. input mode control register programming mode input configuration inmode b3 b2 b1 b0 ina1 ina2 inb1 inb2 inc1 inc2 0 0 0 0 lrlrlr 0001lrlrm+m- 0010lrm+m-lr 0 0 1 1 l r m+m-m+m- 0100lrr+r-l+l- 0101lrl+l-r+r- 0110m+m-lrlr 0 1 1 1 m+m- l r m+m- 1 0 0 0 m+m-m+m- l r 1 0 0 1 m+m-m+m-m+m- 1010m+m-r+r-l+l- 1011m+m-l+l-r+r- table 5a. input mode programming mode internal signals left (l), right (r), and mono (m) inmode b3 b2 b1 b0 lrm 0 0 0 0 ina1 + inb1 + inc1 ina2 + inb2 + inc2 0 0 0 1 ina1 + inb1 ina2 + inb2 inc1 - inc2 0 0 1 0 ina1 + inc1 ina2 + inc2 inb1 - inb2 0 0 1 1 ina1 ina2 (inb1 - inb2) + (inc1 - inc2) 0 1 0 0 ina1 + (inc1 - inc2) ina2 + (inb1 - inb2) 0 1 0 1 ina1 + (inb1 - inb2) ina2 + (inc1 - inc2) 0 1 1 0 inb1 + inc1 inb2 + inc2 ina1 - ina2 0 1 1 1 inb1 inb2 (ina1 - ina2) + (inc1 - inc2) 1 0 0 0 inc1 inc2 (ina1 - ina2) + (inb1 - inb2) 1001 (ina1 - ina2) + (inb1 - inb2) + (inc1 - inc2) 1 0 1 0 inc1 - inc2 inb1 - inb2 ina1 - ina2 1 0 1 1 inb1 - inb2 inc1 - inc2 ina1 - ina2 table 5b. internal signals l, r, and m
the max9775/max9776 have separate volume controls for each of the internal signals: left (l), right (r), and mono (m). the final gain of each signal is determined by the way the following bits are set: mvol, lvol, rvol, ina+20db, in+6db, and mono+6db. table 7 shows how to configure the l, r, and m amplifiers for specific gains. max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 29 mono/left/right volume control register b7 b6 b5 b4 b3 b2 b1 b0 mono volume control 0 0 1 mvol left volume control 0 1 0 lvol right volume control 0 1 1 rvol table 6. mono/left/right volume control registers mvol/lvol/rvol b4 b3 b2 b1 b0 gain (db) 00000 mute 00001 -75 00010 -71 00011 -67 00100 -63 00101 -59 00110 -55 00111 -51 01000 -47 01001 -44 01010 -41 01011 -38 01100 -35 01101 -32 01110 -29 01111 -26 mvol/lvol/rvol b4 b3 b2 b1 b0 gain (db) 10000 -23 10001 -21 10010 -19 10011 -17 10100 -15 10101 -13 10110 -11 10111 -9 11000 -7 11001 -6 11010 -5 11011 -4 11100 -3 11101 -2 11110 -1 11111 0 table 7. volume control settings
max9775/max9776 mono+6db in the output mode control register allows an extra 6db of gain on the internal mono signal: 1 = additional 6db of gain is applied to the internal mono (m) signal path. 0 = no additional gain is applied to the internal mono (m) signal path. the max9775 has five output amplifiers: a mono receiver amplifier, a stereo directdrive headphone amplifier, and a stereo class d amplifier. the max9776 has four output amplifiers: a mono receiver amplifier, a stereo directdrive headphone amplifier, and a mono class d amplifier. table 9 shows how each of the three internal signals left (l), right (r), and mono (m)?re mixed and rout- ed to the various outputs. 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 30 ______________________________________________________________________________________ output mode control register b7 b6 b5 b4 b3 b2 b1 b0 output mode control 1 0 0 mono+6db outmode (table 9) table 8. output mode control register outmode max9775 max9776 mode b3 b2 b1 b0 receiver left hp right hp left spk right spk 00000 10001 m 20010 m m m 30011 m m m m m 40100 m m 50101 60110 1 / 2 (l + r) 70111 l r l + r 81000 l r l r l + r 91001 l r 101010 111011m + 1 / 2 (l + r) 12 1 1 0 0 l + m r + m l + r + 2m 13 1 1 0 1 l + m r + m l + m r + m l + r + 2m 14 1 1 1 0 l + m r + m 15 1 1 1 1 mute mute mute mute mute mute table 9. output modes ?= amplifier off. l = left signal. r = right signal. m = mono signal.
the global control register is used for global configu- rations, those affecting all inputs and outputs. the bits in the control register are shown in table 11. max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 31 global control register register b7 b6 b5 b4 b3 b2 b1 b0 global control register 1 0 1 shdn in+6db mute ssm 3d/mono table 10. global control register bit name function b4 shdn 1 = normal operation 0 = low-power shutdown mode. i 2 c settings are saved. b3 in+6db 1 = all input signals are boosted by 6db. 0 = all input signals are passed un-amplified. this bit does not affect ina if the ina+20db bit (b4 of the input mode control register) is set to 1, in which case ina is boosted by 20db. b2 mute 1 = mute all outputs. 0 = all outputs are active. b1 ssm 1 = spread-spectrum class d modulation. 0 = fixed-frequency class d modulation. b0 3d/mono max9775: 1 = 3d enhancement is on. 0 = 3d enhancement is off. 1 = speakers will output l+r in modes 7, 8, 12, and 13 (see table 9). 0 = speakers will output l in modes 7, 8, 12, and 13 (see table 9). table 11. global control register configurations applications information class d filterless operation traditional class d amplifiers require an output filter to recover the audio signal from the amplifier? pwm out- put. the filters add cost, increase the solution size of the amplifier, and can decrease efficiency. the tradi- tional pwm scheme uses large differential output swings (2 x v dd(p-p) ) and causes large ripple currents. any parasitic resistance in the filter components results in a loss of power, lowering the efficiency. the max9775/max9776 do not require an output filter. the device relies on the inherent inductance of the speaker coil and the natural filtering of both the speak- er and the human ear to recover the audio component of the square-wave output. eliminating the output filter results in a smaller, less costly, more efficient solution. because the switching frequency of the max9775/ max9776 speaker output is well beyond the bandwidth of most speakers, voice coil movement due to the square-wave frequency is very small. although this move- ment is small, a speaker not designed to handle the addi- tional power may be damaged. for optimum results use a speaker with a series inductance > 10?. typical 8 speakers, for portable audio applications, exhibit series inductances in the 20? to 100? range. input amplifier differential input the max9775/max9776 feature a programmable differ- ential input structure, making it compatible with many codecs, and offering improved noise immunity over a single-ended input amplifier. in devices such as cell phones, high-frequency signals from the rf transmitter can be picked up by the amplifier? input traces. the signals appear at the amplifier? inputs as common- mode noise. a differential input amplifier amplifies the difference of the two inputs and any signal common to both is cancelled.
single-ended input the max9775/max9776 can be configured as a single- ended input amplifier by appropriately configuring the input control register (see tables 5a and 5b). dc-coupled input the input amplifier can accept dc-coupled inputs that are biased to the amplifier? bias voltage. dc-coupling eliminates the input-coupling capacitors; reducing com- ponent count to potentially six external components (see the typical application circuits ). however, the highpass filtering effect of the capacitors is lost, allow- ing low-frequency signals to feed through to the load. unused inputs connect any unused input pin directly to vbias. this saves input capacitors on unused inputs and provides the highest noise immunity on the input. component selection input filter an input capacitor (c in ) in conjunction with the input impedance of the max9775/max9776 form a highpass filter that removes the dc bias from the incoming signal. the ac-coupling capacitor allows the amplifiers to auto- matically bias the signal to an optimum dc level. assuming zero source impedance, the -3db point of the highpass filter is given by: choose c in so that f -3db is well below the lowest fre- quency of interest. use capacitors whose dielectrics have low-voltage coefficients, such as tantalum or alu- minum electrolytic. capacitors with high-voltage coeffi- cients, such as ceramics, may result in increased distortion at low frequencies. other considerations when designing the input filter include the constraints of the overall system and the actual frequency band of interest. although high-fidelity audio calls for a flat-gain response between 20hz and 20khz, portable voice-reproduction devices such as cell phones and two-way radios need only concentrate on the frequency range of the spoken human voice (typi- cally 300hz to 3.5khz). in addition, speakers used in portable devices typically have a poor response below 300hz. taking these two factors into consideration, the input filter may not need to be designed for a 20hz to 20khz response, saving both board space and cost due to the use of smaller capacitors. class d output filter the max9775/max9776 do not require a class d out- put filter. the devices pass en55022b emission stan- dards with 152mm of unshielded speaker cables. however, output filtering can be used if a design is fail- ing radiated emissions due to board layout or cable length, or the circuit is near emi-sensitive devices. use a ferrite bead filter when radiated frequencies above 10mhz are of concern. use an lc filter when radiated frequencies below 10mhz are of concern, or when long leads (> 152mm) connect the amplifier to the speaker. figure 12 shows optional speaker amplifier output filters. external component selection bias capacitor v bias is the output of the internally generated dc bias voltage. the v bias bypass capacitor, c vbias improves psrr and thd+n by reducing power supply and other noise sources at the common-mode bias node, and also generates the clickless/popless, startup/shutdown dc bias waveforms for the speaker amplifiers. bypass v bias with a 1? capacitor to gnd. f rc db in in ? = 3 1 2 max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 32 ______________________________________________________________________________________ out_+ out_- 33 h 33 h 0.47 f 0.033 f 0.1 f 22 22 0.033 f 0.1 f figure 12. speaker amplifier output filter
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 33 table 12. suggested capacitor manufacturers supplier phone fax website taiyo yuden 800-348-2496 847-925-0899 www.t-yuden.com tdk 807-803-6100 847-390-4405 www.component.tdk.com charge-pump capacitor selection use capacitors with an esr less than 100m for opti- mum performance. low-esr ceramic capacitors mini- mize the output resistance of the charge pump. most surface-mount ceramic capacitors satisfy the esr requirement. for best performance over the extended temperature range, select capacitors with an x7r dielec- tric or better. table 12 lists suggested manufacturers. flying capacitor (c1) the value of the flying capacitor (c1) affects the output resistance of the charge pump. a c1 value that is too small degrades the device? ability to provide sufficient current drive, which leads to a loss of output voltage. increasing the value of c1 reduces the charge-pump out- put resistance to an extent. above 1?, the on-resistance of the switches and the esr of c1 and c2 dominate. output capacitor (c2) the output capacitor value and esr directly affect the ripple at cpv ss . increasing the value of c2 reduces output ripple. likewise, decreasing the esr of c2 reduces both ripple and output resistance. lower capacitance values can be used in systems with low maximum output power levels. see the output power vs. load resistance and charge-pump capacitor size graph in the typical operating characteristics . cpv dd bypass capacitor (c3) the cpv dd bypass capacitor (c3) lowers the output impedance of the power supply and reduces the impact of the max9775/max9776? charge-pump switching transients. bypass cpv dd with c3 to pgnd and place it physically close to the cpv dd and pgnd. use a value for c3 that is equal to c1. supply bypassing, layout, and grounding proper layout and grounding are essential for optimum performance. use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance. large traces also aid in mov- ing heat away from the package. proper grounding improves audio performance, minimizes crosstalk between channels, and prevents any switching noise from coupling into the audio signal. connect pgnd and gnd together at a single point on the pcb. route all traces that carry switching transients away from gnd and the traces/components in the audio signal path. connect all of the power-supply inputs (cpv dd , v dd , and pv dd ) together. bypass cpv dd with a 1? capaci- tor to cpgnd. bypass v dd with 1? capacitor to gnd. bypass pv dd with a 1? capacitor in parallel with a 0.1? capacitor to pgnd. place the bypass capacitors as close to the max9775/max9776 as possible. place a bulk capacitor between pv dd and pgnd if needed. use large, low-resistance output traces. current drawn from the outputs increases as load impedance decreases. high output trace resistance decreases the power delivered to the load. large output, supply, and gnd traces also allow more heat to move from the max9775/max9776 to the pcb, decreasing the thermal impedance of the circuit. tqfn applications information the max9776 tqfn-ep package features an exposed thermal pad on its underside. this pad lowers the package? thermal impedance by providing a direct heat conduction path from the die to the pcb. the exposed pad is internally connected to gnd. connect the exposed thermal pad to the pcb gnd plane. wlp applications information for the latest application details on wlp construction, dimensions, tape carrier information, pcb techniques, bump-pad layout, and recommended reflow tempera- ture profile, as well as the latest information of reliability testing results, refer to application note 1891: understanding the basics of the wafer-level chip- scale package (wl-csp) available on maxim? website at www.maxim-ic.com/ucsp . wlp thermal consideration when operating at maximum output power, the wlp thermal dissipation can become a limiting factor. the wlp package does not dissipate as much power as a tqfn and as a result will operate at a higher tempera- ture. at peak output power into a 4 load, the max9775/max9776 can exceed its thermal limit, trig- gering thermal protection. as a result, do not choose the wlp package when maximum output power into 4 is required.
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 34 ______________________________________________________________________________________ chip information process: bicmos pin configurations top view tqfn-ep* 32 28 29 30 31 25 26 27 i.c. ina1 pgnd i.c. shdn ina2 i.c. gnd 10 13 15 14 *ep 16 11 12 9 cpv dd vbias c1p c1n cpgnd cpv ss inc1 hpl 17 18 19 20 21 22 23 i.c. 24 inb1 inb2 v dd outrx inc2 hpr v ss 2 3 4 5 6 7 8 i.c. i.c. sda out+ pgnd scl out- 1 pv dd max9776 + top view (bumps on bottom) max9775 c1p cpgnd c1n cpv dd 1 a b c d 234 outl+ sda pgnd scl wlp e f pv dd outr- pgnd outr+ cpv ss hpl cl_h vbias inc1 cl_l v ss hpr 56 inc2 outrx inb2 v dd cr_h gnd outl- shdn ina1 ina2 inb1 cr_l max9776 c1p cpgnd c1n cpv dd 1 a b c d 234 out+ sda pgnd scl wlp e f pv dd i.c. pgnd i.c. cpv ss hpl i.c. vbias inc1 i.c. v ss hpr 56 inc2 outrx inb2 v dd i.c. gnd out- shdn ina1 ina2 inb1 i.c.
max9775/max9776 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) qfn thin.eps 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 35
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier 36 ______________________________________________________________________________________ package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier ______________________________________________________________________________________ 37 wlp pkg.eps package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) package type package code document no. 36 wlp w363a3+3 21-0024 32 tqfn-ep t3255-4 21-0140
max9775/max9776 2 x 1.5w, stereo class d audio subsystem with directdrive headphone amplifier maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 38 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2008 maxim integrated products is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/07 initial release 1 7/07 initial release of max9776 ucsp package and updated tables 3 and 5b 1, 7, 27, 28 2 9/07 initial release of max9775 ucsp and removal of max9775 tqfn, updated pin description and table 9 1, 12, 15, 30, 33, 34 3 1/08 updated the typical application circuits 17, 18 4 8/08 changed package code and drawing 1, 33, 34, 37

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