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low distortion 1.5 watt audio power amplifier ssm2211 rev. c in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . s p ecificatio n s subj ec t to ch an g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . features 1.5 w output 1 differentia l (bt l 2 ) output single-supply operation: 2.7 v to 5.5 v functions down to 1.75 v wide bandwi dt h: 4 mhz highly stabl e , phase margin: >80 degrees low d istortion: 0.2% th d @ 1 w ou tpu t excellent power-su pply rejection applic ati o ns portable computers personal wireless communicators hands-fr ee te l e phones speaker phones intercoms musical toys and talk ing game s general description the ss m2211 3 is a hig h p e r f o r ma n c e a u d i o a m plif ier t h a t d e l i ve r s 1 w r m s of l o w d i stor t i on a u d i o p o we r i n to a br i d ge - co nn ec t e d 8 ? sp eak e r lo ad (o r 1.5 w r m s in t o 4 ? lo ad). i t o p era t es o v er a wi de t e m p era t u r e ra n g e a nd is sp e c if ie d fo r sin g le-s u p p l y v o l t a g es b e tw een 2.7 v a nd 5.5 v . w h en o p er - a t i n g f r om b a tte r i e s , i t c o n t i n u e s to op e r a t e dow n to 1 . 7 5 v . this mak e s t h e ss m2211 the bes t c h oice f o r unr e gu la t e d a p plic a t io n s , su ch as t o y s an d g a m e s. f e a t ur in g a 4 mhz b a ndwi d t h and disto r t i o n b e lo w 0.2% thd @ 1 w , sup e r i o r p e r f o r ma n c e is d e liv e r e d a t hig h er p o wer o r lo w e r s p eak e r lo ad im p e dan c e t h a n com p et i t iv e uni t s. the lo w dif f er en t i al dc o u t p ut v o l t a g e r e s u l t s i n n e g l ig ib le los s es in t h e s p e a k e r w i n d in g , and mak e s hig h val u e dc b l o c k i n g ca p a c i to rs unn e cess a r y . b a t t er y life is ex tende d b y usin g sh ut do w n m o de , w h ich ty p i ca l l y r e d u ces q u ies c e n t c u r r en t dra i n t o 100 na. func tio n a l block di agram v out b in? in+ shutdown bypass v out a v? (gnd) bias 00358-001 ssm2211 fi g u r e 1 . the ss m2211 is desig n e d t o o p era t e o v er t h e ? 20c t o +85c t e m p era t ur e ra ng e . th e ss m221 1 is a v a i la b l e in so i c -8 an d lfcs p (le a d f r a m e chi p s c ale) sur f ace m o un t p a cka g es. th e ad van c e d m e c h a n ical p a cka g ing o f th e ss m22 11cp en s u r e s lo w e r chi p t e m p era t ur e and enha n c e d p e r f o r ma n c e re l a t i v e t o st a n d a rd p a ck a g i n g opt i on s . a p plica t io n s incl ude p e rs o n al p o r t a b le co m p ut ers, han ds-f r e e teleph on es an d t r a n s c ei vers, t a l k in g to y s , in ter c o m sy stem s, and o t h e r lo w v o l t a g e a u dio sys t em s r e q u ir in g 1 w ou t p ut p o w e r . 1 1.5 w @ 4 ? 25c a m bient, < 1% thd, 5 v supply, 4-layer pcb. 2 brid ge-tied l o ad . 3 pr otected by u. s. patent no. 5,519,576.
ssm2211 rev. c | page 2 of 20 table of contents electrical characteristics ................................................................. 3 absolute maximum ratings ............................................................ 4 pin configurations ........................................................................... 5 typical performance characteristics ............................................. 6 product overview ........................................................................... 13 thermal performancelfcsp ................................................ 13 typical application ......................................................................... 14 bridged output vs. single-ended output configurations ... 14 speaker efficiency and loudness ............................................. 14 power dissipation ....................................................................... 15 output voltage headroom ........................................................ 16 automatic shutdown-sensing circuit ..................................... 16 shutdown-circuit design example ......................................... 17 start-up popping noise ............................................................. 17 ssm2211 amplifier design example .................................. 17 single-ended applications ........................................................ 18 driving two speakers single endedly ..................................... 18 evaluation board ........................................................................ 19 lfcsp printed circuit board layout considerations .......... 19 outline dimensions ....................................................................... 20 ordering guide .......................................................................... 20 revision history 10/04data sheet changed from rev. b to rev. c updated format..................................................................universal changes to general description .................................................... 1 changes to table 5............................................................................ 4 deleted thermal performancesoic section ........................... 8 changes to figure 31...................................................................... 10 changes to figure 40...................................................................... 12 changes to thermal performancelfcsp section ................. 13 deleted figure 52, renumbered successive figures .................. 14 deleted printed circuit board layout soic section ............ 14 changes to output voltage headroom section ......................... 16 changes to start-up popping noise section .............................. 17 changes to ordering guide .......................................................... 20 10/02Cdata sheet changed from rev. a to rev. b deleted 8-lead pdip .........................................................universal updated outline dimensions ............................................ 15 5/02Cdata sheet changed from rev. 0 to rev. a edits to general description...............................................1 edits to package type ................................................................3 edits to ordering guide ..........................................................3 edits to product overview ...................................................8 edits to printed circuit board layout consideration........................................................................ 13 added section printed circuit board layout considerationlfcsp........................................................ 14
ssm2211 rev. c | page 3 of 20 electrical characteristics table 1. v s = 5.0 v, t a = 25c, r l = 8 ?, c b = 0.1 f, v cm = v d /2, unless otherwise noted. parameter symbol conditions min typ max unit general characteristics differential output offset voltage v oos a vd = 2 4 50 mv output impedance z out 0.1 ? shutdown control input voltage high v ih i sy = < 100 ma 3.0 v input voltage low v il i sy = normal 1.3 v power supply power-supply rejection ratio psrr v s = 4.75 v to 5.25 v 66 db supply current i sy v o1 = v o2 = 2.5 v 9.5 ma supply current, shutdown mode i sd pin 1 = v dd ; see figure 32 100 na dynamic performance gain bandwidth gbp 4 mhz phase margin ? 0 86 degrees audio performance total harmonic distortion thd + n p = 0.5 w into 8 ? , f = 1 khz 0.15 % total harmonic distortion thd + n p = 1.0 w into 8 ? , f = 1 khz 0.2 % voltage noise density e n f = 1 khz 85 nv hz table 2. v s = 3.3 v, t a = 25c, r l = 8 ?, c b = 0.1 f, v cm = v d /2, unless otherwise noted. parameter symbol conditions min typ max unit general characteristics differential output offset voltage v oos a vd = 2 5 50 mv output impedance z out 0.1 ? shutdown input input voltage high v ih i sy = < 100 a 1.7 v input voltage low v il 1 v power supply supply current i sy v o1 = v o2 = 1.65 v 5.2 ma supply current, shutdown mode i sd pin 1 = v dd ; see figure 32 100 na audio performance total harmonic distortion thd + n p = 0.35 w into 8 ? , f = 1 khz 0.1 % table 3. v s = 2.7 v, t a = 25c, r l = 8 ?, c b = 0.1 f, v cm = v s /2, unless otherwise noted. parameter symbol conditions min typ max unit general characteristics differential output offset voltage v oos a vd = 2 5 50 mv output impedance z out 0.1 ? shutdown control input voltage high v ih i sy = < 100 ma 1.5 v input voltage low v il i sy = normal 0.8 v power supply supply current i sy v o1 = v o2 = 1.35 v 4.2 ma supply current, shutdown mode i sd pin 1 = v dd ; see figure 32 100 na audio performance total harmonic distortion thd + n p = 0.25 w into 8 ? , f = 1 khz 0.1 %
ssm2211 r e v. c | pa ge 4 o f 2 0 absolute maximum ratings a b s o l u te max i m u m r a t i n g s a pply a t 25c, un l e ss o t her w is e note d. table 4. p a r a m e t e r v a l u e supply voltage 6 v input voltage v dd common-mode input vol t age v dd esd susceptibili ty 2000 v storage temperature range ?65c to +150c operating temperature range ?20c to +85c junction tempe r ature range ?65c to +165c lead temperature range (soldering, 60 sec) 300c table 5. package type ja units 8-lead lfcsp (c p) 1 50 c/w 8-lead soic (s) 2 1 2 1 c / w 1 for t h e lfc s p, ja i s m e a s ure d wi t h ex pose d lea d fra m e s o ld ere d t o t h e printe d circuit bo ard . 2 f o r the s o ic , ja i s m e a s ure d wi t h t h e devi ce so ld ere d t o a 4- la yer pri n t e d circuit board. s t r e s s es a b o v e t h os e list e d u nde r a b s o l u te m a xim u m r a t i n g s ma y ca us e p e r m a n e n t dama ge to t h e de vi ce. t h is is a st r e ss ra t i n g o n l y ; t h e f u n c t i o n al o p er a t io n o f t h e de v i ce a t t h es e o r a n y o t h e r con d i t io n s ab o v e t h o s e i ndic a t e d i n t h e op era t io nal s e c t io n s o f t h is sp e c if ic a t ion is n o t im pli e d . e x p o sur e t o ab s o lute m a x i m u m r a t i ng c o nd it i o ns for e x te nd e d p e r i o d s m a y af fe c t d e v i c e rel i a b i l it y . esd c a uti o n esd (electrostatic discharge) sensitive device. ele c tros tatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge wi thout detection. although this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity.
ssm2211 r e v. c | pa ge 5 o f 2 0 pin conf igurations 1 2 3 4 8 7 6 5 top view (not to scale) shutdown v out a v+ v? v out b bypass in+ in? 00358-002 1 2 3 4 8 7 6 5 top view (not to scale) shutdown v out a v+ v? v out b bypass in+ in? 00358-003 f i g u re 2. 8-l e ad so ic (so - 8) f i g u re 3. 8-l e ad l f csp (c p - 8)
ssm2211 r e v. c | pa ge 6 o f 2 0 typical perf orm ance cha r acte ristics frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 5v a vd = 2 (btl) r l = 8 ? p l = 500mw 00358-004 fi g u r e 4 . t h d + n v s . fr e q u e n c y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 5v a vd = 10 (btl) r l = 8 ? p l = 500mw 00358-005 fi g u r e 5 . t h d + n v s . fr e q u e n c y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0.1 f c b = 1 f t a = 25 c v dd = 5v a vd = 20 (btl) r l = 8 ? p l = 500mw 00358-006 fi g u r e 6 . t h d + n v s . fr e q u e n c y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 5v a vd = 2 (btl) r l = 8 ? p l = 1w 00358-007 fi g u r e 7 . t h d + n v s . fr e q u e n c y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 5v a vd = 10 (btl) r l = 8 ? p l = 1w 00358-008 fi g u r e 8 . t h d + n v s . fr e q u e n c y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0.1 f c b = 1 f t a = 25 c v dd = 5v a vd = 20 (btl) r l = 8 ? p l = 1w 00358-009 fi g u r e 9 . t h d + n v s . fr e q u e n c y
ssm2211 r e v. c | pa ge 7 o f 2 0 p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 5v a vd = 2 (btl) r l = 8 ? frequency = 20hz c b = 0.1 f 00358-010 f i gure 10. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 5v a vd = 2 (btl) r l = 8 ? frequency = 1khz c b = 0.1 f 00358-011 f i gure 11. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 5v a vd = 2 (btl) r l = 8 ? frequency = 20khz c b = 0.1 f 00358-012 f i gure 12. thd + n vs. p ou tpu t frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 3.3v a vd = 2 (btl) r l = 8 ? p l = 350mw 00358-013 f i gure 13. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 3.3v a vd = 10 (btl) r l = 8 ? p l = 350mw 00358-014 f i gure 14. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0.1 f c b = 1 f t a = 25 c v dd = 3.3v a vd = 20 (btl) r l = 8 ? p l = 350mw 00358-015 f i gure 15. thd + n vs. f r equenc y
ssm2211 r e v. c | pa ge 8 o f 2 0 p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 3.3v a vd = 2 (btl) r l = 8 ? frequency = 20hz c b = 0.1 f 00358-016 f i gure 16. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 3.3v a vd = 2 (btl) r l = 8 ? frequency = 1khz c b = 0.1 f 00358-017 f i gure 17. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 3.3v a vd = 2 (btl) r l = 8 ? frequency = 20khz c b = 0.1 f 00358-018 f i gure 18. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 2.7v a vd = 2 (btl) r l = 8 ? p l = 250mw 00358-019 f i gure 19. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0 c b = 0.1 f c b = 1 f t a = 25 c v dd = 2.7v a vd = 10 (btl) r l = 8 ? p l = 250mw 00358-020 f i gure 20. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 c b = 0.1 f c b = 1 f t a = 25 c v dd = 2.7v a vd = 20 (btl) r l = 8 ? p l = 250mw 00358-021 f i gure 21. thd + n vs. f r equenc y
ssm2211 r e v. c | pa ge 9 o f 2 0 p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 2.7v a vd = 2 (btl) r l = 8 ? frequency = 20hz 00358-022 f i gure 22. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 2.7v a vd = 2 (btl) r l = 8 ? frequency = 1khz 00358-023 f i gure 23. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c v dd = 2.7v a vd = 2 (btl) r l = 8 ? frequency = 20khz 00358-024 f i gure 24. thd + n vs. p ou tpu t frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 r l = 32 ? p o = 60mw r l = 8 ? p o = 250mw t a = 25 c v dd = 5v a vd = 10 single ended c b = 0.1 f c c = 1000 f 00358-025 f i gure 25. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 r l = 32 ? p o = 20mw r l = 8 ? p o = 85mw t a = 25 c v dd = 3.3v a vd = 10 single ended c b = 0.1 f c c = 1000 f 00358-026 f i gure 26. thd + n vs. f r equenc y frequency (hz) thd + n (%) 10 1 0.01 20 100 20k 1k 10k 0.1 r l = 32 ? p o = 15mw r l = 8 ? p o = 65mw t a = 25 c v dd = 2.7v a vd = 10 single ended c b = 0.1 f c c = 1000 f 00358-027 f i gure 27. thd + n vs. f r equenc y
ssm2211 rev. c | page 10 of 20 p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c a vd = 2 (btl) r l = 8 ? frequency = 20hz c b = 0.1 f v dd = 2.7v v dd = 5v v dd = 3.3v 00358-028 f i gure 28. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 t a = 25 c a vd = 2 (btl) r l = 8 ? frequency = 1khz c b = 0.1 f v dd = 2.7v v dd = 5v v dd = 3.3v 00358-029 f i gure 29. thd + n vs. p ou tpu t p output (w) thd + n (%) 10 1 0.01 20n 0.1 2 0.1 1 v dd = 2.7v v dd = 5v v dd = 3.3v t a = 25 c a vd = 2 (btl) r l = 8 ? frequency = 20khz c b = 0.1 f 00358-030 f i gure 30. thd + n vs. p ou tpu t ambient temperature ( c) m a xim u m pow e r d i ssipa tion ( w ) 00358-031 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 ?40 ? 30 ?20 ? 10 0 1 0 3 0 7 0 20 40 50 60 90 80 110 100 120 t j,max = 150c free air, no heat sink soic ja = 121 c/w lfcsp ja = 50 c/w 8-lead soic 8-lead lfcsp f i gure 31. maxi mu m p o w e r d i ssipati o n v s . a m bient t e m p er atu r e shutdown voltage at pin 1 (v) s u p p l y curre nt ( a) 10k 8k 0 05 12 3 4 6k 4k 2k v dd = 5v 00358-032 f i gure 32. sup p l y current v s . sh utd o w n v o lt age supply voltage (v) s u p p l y curre nt (ma) 14 0 01 6 23 4 5 12 10 8 4 2 6 t a = 25 c r l = open 00358-033 f i gure 33. sup p l y current v s . sup p ly v o ltag e
ssm2211 rev. c | page 11 of 20 load resistance ( ? ) outp ut p o we r (w) 1.6 0.6 0 48 4 8 12 16 20 24 28 32 36 40 44 1.4 0.8 0.4 0.2 1.2 1.0 5v 3.3v 2.7v 00358-034 f i g u re 34. p ou tpu t v s . l oad r e s i s t ance frequency (hz) gain ( d b) 80 ?60 ?80 ?40 ?20 0 20 40 60 100 1k 100m 10k 100k 1m 10m ph a se sh ift ( d egrees) 180 ?135 ?180 ?90 ?45 0 45 90 135 00358-035 f i g u re 35. g a in, p h as e v s . f r equenc y ( s ing l e a m p lif ier) output offset voltage (mv) fre q ue ncy 25 20 0 ? 2 0 ? 15 25 ? 1 0 ? 5 0 10 15 20 5 15 10 5 v dd = 2.7v sample size = 300 00358-036 f i gure 36. o u tput o ffs et v o ltage d i s t ributi on output offset voltage (mv) fre q ue ncy 20 16 0 ?30 ? 20 30 ?10 0 10 20 12 8 4 v dd = 3.3v sample size = 300 00358-037 f i gure 37. o u tput o ffs et v o ltage d i s t ributi on output offset voltage (mv) 20 16 0 ? 3 0 ? 20 30 ?10 0 10 20 12 8 4 v dd = 3.3v sample size = 300 fre q ue ncy v dd = 5v sample size = 300 00358-038 f i gure 38. o u tput o ffs et v o ltage d i s t ributi on supply current (ma) fre q ue ncy 600 300 0 6 7 8 9 10 11 12 13 14 15 500 400 200 100 v dd = 5v sample size = 1,700 00358-039 f i gure 39. sup p l y current d i s t r i buti on
ssm2211 rev. c | page 12 of 20 frequency (hz) p s rr (db) ?7 0 20 100 30k 1k 10k t a = 25 c v dd = 5v 100mv c b = 15 f a vd = 2 ?6 5 ?6 0 ?5 5 ?5 0 00358-040 fi g u r e 4 0 . p s r r v s . fr e q u e n c y
ssm2211 rev. c | page 13 of 20 product overview the ss m2211 is a lo w dis t o r tio n s p e a k e r a m p l if ier tha t can r u n f r o m a 1.7 v t o 5.5 v s u p p l y . i t co n s is ts o f a ra il -t o-ra il in p u t a nd a dif f er en tial o u t p u t tha t can b e dr i v en wi t h in 400 mv o f e i t h e r su p p ly r a i l w h i l e s u p p ly i n g a su st ai ne d out p u t c u r r e n t of 350 ma. the ss m2211 is uni t y-ga in s t a b le , r e q u ir in g n o ex ter n a l co m p e n s a t i on c a p a ci to rs, a n d ca n b e co nf igur e d fo r ga in s o f u p t o 40 db . f i gur e 41 s h o w s t h e s i m p l i f i ed s c h e ma tic. 4 3 shutdown v o1 v dd a2 a1 2 v in 20k ? 20k ? 50k ? 0.1 f 7 8 5 6 ssm2211 50k ? 50k ? 50k ? v o2 bias control 00358-041 1 f i g u re 41. si mpl i f i e d s c h e m a t i c pin 4 an d pi n 3 a r e t h e i n ver t ing a nd n o ni n v er t i n g ter m ina l s t o a1. an o f fs et v o l t a g e is p r o v ided a t p i n 2, whic h sh o u l d b e co nn e c te d to pi n 3 fo r us e in si n g le-su p ply a p plica t io n s . t h e o u t p u t o f a1 a p p e a r s a t p i n 5. a s e con d o p am p , a2, is co nf ig- ur ed wi t h a f i xed ga in o f a v = ?1 a nd p r o d uces a n in v e r t e d r e p l ica o f p i n 5 a t p i n 8. th e ss m2211 o u t p u t s a t p i n s 5 and 8 p r o d uce a b r idge d co nf igur a t ion o u tp u t to w h i c h a sp e a k e r can b e co n n e c t e d . t h is b r idge conf igura t io n o f fers t h e a d van t a g e o f a m o r e ef f i cien t p o w e r t r a n sfer f r o m t h e i n p u t to t h e sp e a ker . b e ca us e b o t h ou t p uts a r e symm et r i c , t h e dc b i as a t p i n s 5 and 8 a r e exac t l y e q ua l , r e s u l t in g in ze r o dc dif f er en t i a l v o l t a g e acr o s s t h e ou t p u t s. thi s e l i m ina t es t h e n e e d fo r a co u p lin g c a p a ci t o r a t th e o u t p u t . thermal performancelfcsp the addi t i o n o f t h e lfcs p t o t h e analog d e vic e s p a cka g e p o r t f o lio o f f e rs th e s s m2211 us er ev en g r ea t e r c h o i ce w h en co n s ider in g t h e r mal p e r f o r ma nce cr i t er ia . f o r t h e 8-l e ad, 3 mm 3 mm lfcs p , t h e ja i s 50c/ w . this i s a sig n if ic a n t p e r f o r ma n c e im p r o v em e n t o v er m o s t o t h e r p a cka g i n g o p t i on s.
ssm2211 rev. c | page 14 of 20 typical a p plicati on ssm2211 a udio input speaker 8v r f c s 5v 2 7 1 8 5 6 4 3 ? + c c r i c b ? + 00358-042 f i g u re 42. t y pic a l conf ig ur at i o n f i gur e 42 sh o w s h o w t h e ss m22 11 is co nn ec t e d in a typ i cal a p p l ic a t ion. th e ss m2211 ca n b e co nf igur ed f o r ga in m u ch like a s t anda r d o p am p . th e ga i n f r o m t h e a u dio i n p u t t o t h e sp e a ke r is i f v r r a = ( 1 ) t h e 2 f a ct o r co m e s f r o m th e fa ct th a t p i n 8 h a s th e o p pos i t e p o la r i ty f r o m pin 5, p r o v id in g t w ic e t h e v o l t a g e swi n g t o t h e sp e a k e r f r o m t h e b r idge d o u t p ut co nf igura t io n. c s is a su p p ly b y p a ss c a p a c i tor to p r o v id e p o we r su p p ly f i l t er in g. pi n 2 i s co nn e c te d to pin 3 to p r o v ide a n o f fs et vol t a g e fo r sing l e -su p pl y u s e, wit h c b pr o v i d in g a lo w a c im p e d a n c e t o g r ou nd to hel p p o we r - su p p ly re j e c t ion. b e c a u s e pin 4 is a vir t ual ac g r o u nd , t h e i n p u t i m p e dan c e is e q u a l t o r i . c c is t h e in p u t co u p lin g ca p a ci t o r which als o cr ea t e s a hig h -p as s f i l t er wi t h a co r n er f r e q uen c y o f c i hp c r f = ( 2 ) b e ca us e t h e ss m2211 has a n exce l l en t p h as e ma rg in, a f e e d b a c k c a pa c i t o r i n pa rall e l w i th r f t o b a nd li mi t t h e am plif ier is n o t r e q u ir e d , as i t is in s o m e co m p e t i t o r s p r o d uc ts. bridged o u tput vs. s i ngle-ende d ou tpu t configurations the p o wer del i ver e d t o a lo ad w i t h a si n u s o i d a l sig n a l can b e exp r es s e d i n t e r m s o f t h e sig n al s p e ak v o l t a g e and t h e r e sis t an c e o f t h e lo ad as l pk l r v p 2 2 = (3) by dr i v i n g a lo a d f r o m a b r i d ge d o u tp u t co nf ig ur a t io n, t h e vol t a g e s w ing a c r o ss t h e lo ad d o ub les. t h us, an adva n t a g e in usin g a b r i d ge d o u t p ut co nf igura t io n b e com e s a p p a r e n t f r o m e q ua tion 3, as do u b lin g t h e p e a k v o l t a g e r e s u l t s in f o ur tim e s th e p o w e r de li ver e d t o t h e lo ad . i n a typ i cal a p p l ica t io n op e r a t i n g f r om a 5 v supply , t h e m a x i m u m p o we r t h a t c a n b e de liv e r e d b y t h e ss m2211 t o a n 8 ? s p eak e r in a sin g le-ended co nf igura t io n is 250 mw . b y dr ivin g this sp eaker wi t h a b r idg e d o u t p u t , 1 w o f p o w e r can be de li v e r e d . this tr a n s l a t es t o a 12 db i n cr e a s e i n s o und-p r essur e l e vel f r o m t h e sp e a k e r . dr i v i n g a sp e a ker dif f er en t i a l ly f r o m a b r idge d o u t p ut o f fers a n o t h e r ad van t ag e in t h a t i t eli m ina t es t h e n e e d fo r a n o u t p ut co u p lin g c a p a ci t o r t o th e lo ad . i n a sin g le-s u p p l y a p p l ica t io n, t h e q u ies c en t v o l t a g e a t t h e o u t p u t is half o f t h e s u p p l y v o l t a g e . i f a sp e a k e r is c o nn e c te d in a si n g le-e nde d co n f igur a t io n, a co u p l i n g ca pa ci t o r i s n eeded t o p r ev e n t d c curr e n t f r o m f l o w in g t h r o u g h th e s p ea k e r . t h i s c a pa ci t o r a l s o n e ed s t o b e l a r g e e n o u g h t o p r ev en t l o w f r eq uen c y r o ll - o f f . t h e co rn e r f r eq ue n c y is g i v e n b y c l c r f = ? ( 4 ) w h er e r l is t h e sp e a ke r re s i st anc e and c c is t h e co u p lin g ca p a ci tan c e . f o r a n 8 ? s p ea k e r a nd a co r n er f r eq uen c y o f 2 0 h z , a 1000 f ca p a ci t o r w o u l d be n e e d ed , whic h is p h ysic al l y la rg e a nd cos t l y . by co nn e c t i n g a sp e a k e r in a b r i d ge d o u t p ut conf igur a t io n, t h e q u ies c e n t dif f er en t i al v o l t a g e ac r o s s t h e sp e a k e r b e com e s n e a r l y zer o , elim ina t ing t h e n e e d fo r t h e co u p l i n g ca p a ci t o r . speaker efficie n cy and lou d ne ss the ef fe c t i v e lo udn e s s o f 1 w of p o w e r deli v e r e d i n t o a n 8 ? s p e a k e r is a f u nc t i o n o f t h e sp e a k e r s ef f i cien c y . the ef f i cien c y is ty p i c a l l y r a te d a s t h e s o u n d p r essur e le vel (spl) a t 1 m e ter in f r o n t o f th e spe a k e r wi th 1 w o f po w e r a p p l i e d t o th e s p e a k e r . m o s t s p eakers a r e betw een 85 db a nd 95 db s p l a t 1 m e ter a t 1 w . t a bl e 6 s h ow s a c o m p ar i s o n of t h e rel a t i v e l o u d ne ss of dif f er en t s o u n ds. table 6. ty pical soun d pressure le vels source of sound db spl threshold of pai n 120 heavy street traffic 95 cabin of jet aircr a ft 80 average conver sation 65 average home a t night 50 quiet recording studio 30 t h reshold of he aring 0 i t ca n easil y be s e en tha t 1 w o f p o w e r in t o a sp eak e r can p r o d uce q u i t e a b i t o f aco u s t ic e n erg y .
ssm2211 rev. c | page 15 of 20 power diss ipatio n an o t h e r i m p o r t a n t a d van t a g e i n usin g a b r idge d o u t p u t co nf ig - ura t io n is t h e fa c t t h a t b r idge d o u t p ut a m pl if iers a r e m o r e ef f i cien t t h a n s i n g le-e nde d am plif iers in d e li ve r i n g p o w e r t o a l o a d . e ffi c i e n c y i s d e fi n e d a s th e r a t i o o f p o w e r fr o m t h e p o w e r su p p ly to t h e p o we r del i v e re d to t h e l o a d : sy l p p = an a m p l if ier wi th a hig h er ef f i cien c y has les s in t e r n al p o w e r dissi p a t io n, w h i c h r e su l t s i n a lo w e r die - to -ca s e j u n c t i on te m p - era t ur e , as com p a r e d t o a n am plif ier t h a t is less ef f i cien t. t h is is im p o r t an t w h e n co n s ider in g t h e am plif ier s m a xim u m p o w e r dissi p a t io n r a t i n g vs. am b i en t tem p er a t ur e. a n in ter n a l p o w e r dissi p a t io n vs . o u t p ut p o w e r e q ua t i on can b e d e r i ve d to f u l l y un de r s ta n d th i s . the i n t e r n a l p o w e r dissi p a t io n o f t h e am plif ier is t h e in t e r n a l v o l t a g e dr o p m u l t i p lie d b y t h e a v era g e val u e o f t h e s u p p l y c u r r e n t . a n e a s i e r w a y to f i nd i n te r n a l p o we r d i ss i p a t i o n i s to m e as ur e t h e dif f er en ce b e tw e e n t h e p o w e r de li ver e d b y t h e su p p ly vol t a g e s o ur ce a nd t h e p o w e r del i ver e d i n to t h e lo ad . the w a v e fo r m o f t h e su p p l y c u r r en t fo r a b r idge d o u t p u t a m plif ier is sh o w n i n f i gur e 43 . t t 00358-043 v out v peak i sy i dd, peak time i dd, avg time f i g u re 43. br idg e d a m plif ier o u t p ut v o lt ag e and su p p ly current v s . ti me by in t e g r a t in g t h e su p p l y c u r r en t o v er a p e r i o d t , t h e n dividing t h e re su lt b y t , i dd , a v g ca n b e fo u n d . e x p r ess e d i n ter m s o f p e a k o u t p ut vol t a g e and lo ad r e sist ance l peak avg dd r v i = ( 5 ) ther efo r e p o w e r de li v e r e d b y t h e su p p l y , n e g l e c t i n g t h e b i as c u r r en t fo r t h e de vice is l peak dd sy r v v p = (6) the p o wer dissi p a t e d b y t h e am plif ier in t e r n a l ly is sim p ly t h e dif f er en ce b e twe e n e q u a t i on 6 a nd e q u a t i o n 3 . the e q ua t i on f o r in t e r n al p o wer d i s s i p a t ed , p di ss , exp r es s e d i n t e r m s o f p o w e r deliver e d to t h e lo ad a nd lo ad r e sist a n c e is l peak dd diss r v v p = ( 7 ) the g r a p h o f this eq ua tio n is sho w n in f i gur e 4 4 . output power (w) 1.5 0 0 1.5 pow e r d i ssipa tion ( w ) 0.5 1.0 1.0 0.5 v dd = 5v r l = 4 ? r l = 8 ? r l = 16 ? 00358-044 f i gure 4 4 . p o wer dissi pa ti on vs . o u tput p o w e r wi th v dd = 5 v b e ca us e t h e ef f i cien c y o f a b r i d g e d o u t p u t am plif ier (e q u a t ion 3 divide d b y e q u a t i o n 6) i n cr e a s e s w i t h t h e s q ua re r o o t o f p l , t h e p o we r diss i p a t e d i n te r n a l ly b y t h e de v i c e st a y s rel a t i v e ly f l a t , a nd ac t u a l ly de c r e a s e s w i t h hig h er o u t p u t p o w e r . the max i - m u m p o w e r dissi p a t i o n o f t h e d e v i ce can b e fo u nd b y dif f er - e n ti a t i n g eq u a ti o n 7 w i th r e s p ect t o l o a d po w e r , a n d s e t t i n g th e de r i v a t i ve e q u a l to ze ro . t h i s y i el ds 0 1 2 2 1 = ? = ? ? ? l l dd l diss p r v p p ( 8 ) an d o c c u rs w h en 2 2 , 2 l dd max diss r v p = ( 9 ) u s in g e q u a t i on 9 a nd t h e p o w e r der a t i n g c u r v e in f i gur e 31, t h e maxim u m am b i e n t t e m p er a t ur e can b e fo und e a si l y . this en s u r e s tha t t h e ss m2211 do es n o t excee d i t s maxim u m j u n c tion t e m p er a t ur e o f 150c. the p o wer dissi p a t io n fo r a sing le-e n d e d o u t p u t a p pli c a t io n w h er e t h e lo ad i s ca p a ci t i ve l y co u p le d is g i v e n b y l l l dd diss p p r v p ? = ? ( 1 0 ) the g r a p h o f e q ua tion 10 is sh o w n in f i gur e 45 .
ssm2211 rev. c | page 16 of 20 output power (w) 0.35 0.30 0 0 0.4 0.1 pow e r d i ssipa tion ( w ) 0.2 0.3 0.20 0.15 0.10 0.05 0.25 v dd = 5v r l = 4 ? r l = 8 ? r l = 16 ? 00358-045 f i gure 45. p o wer d i ssipation vs. sing le -ended o u tput p o w e r with v dd = 5 v the max i m u m p o w e r diss i p a t i o n fo r a sin g le-e n d e d o u t p ut is l dd max diss r v p 2 2 , = ( 1 1 ) outpu t vo ltage hea d room the o u t p u t s o f bo t h a m p l if iers in t h e s s m2211 ca n com e t o wi thin 400 mv o f ei ther s u p p l y ra il while dr iving a n 8 ? lo ad . a s com p a r ed t o o t h e r com p et i t o r s eq ui valen t p r o d uc ts, t h e ss m2211 has a hig h er o u t p u t vol t a g e h e adr o o m . this mea n s tha t t h e s s m22 11 ca n de li ver a n eq uivalen t maxim u m o u t p u t p o w e r w h i l e r u nnin g f r o m a lo w e r su p p ly vol t a g e. by r u nnin g a t a l o we r su p p ly v o l t age, t h e in te r n a l p o we r diss ip a t ion of t h e de vice is r e d u ce d , as can be s een in e q u a tio n 9. this ext e n d ed output h e a d ro o m , a l ong w i t h t h e l f c s p p a ck age, a l l o w s t h e ss m2211 t o o p era t e in hig h er a m b i en t t e m p era t ur es than o t h e r co m p et i t o r s de vices. the ss m2211 is als o ca p a b l e o f p r o v idin g am p l if ica t io n ev en a t s u p p l y v o l t a g es as lo w as 1.7 v . the maxi m u m p o w e r a v a i l a b l e a t t h e o u t p ut is a f u n c t i o n o f t h e s u p p l y v o l t a g e. ther efo r e , as t h e s u p p l y v o l t ag e de cr e a s e s, s o do es t h e maxim u m p o wer output f r om t h e d e v i c e . t h e m a x i m u m output p o we r v s . supply v o l t a g e a t va r i ous b r idg e d-tie d lo ad r e sis t a n ces is s h o w n in f i gur e 46 t h e max i m u m o u t p u t p o w e r is d e f i n e d as t h e p o in t a t w h ich t h e o u t p u t has 1% t o t a l ha r m o n ic dist or t i o n (thd). t o f i n d t h e mi nim u m s u p p l y v o l t a g e n e e d e d t o achie v e a sp e c if ie d max i m u m u ndisto r te d o u tp u t p o w e r , us e f i gur e 46. f o r exa m p l e , a n a p p l ic a t ion r e q u ir es o n l y 500 mw t o b e o u t p u t f o r a n 8 ? s p eak e r . w i th t h e s p eak e r co nn ect e d in a b r id g e d o u t p ut co nf igur a t io n, t h e mi ni m u m su p p ly vol t a g e r e q u ir e d is 3.3 v . supply voltage (v) 0 1.5 5.0 2.0 max p out @ 1 % thd (w) 2.5 3.0 3.5 4.0 4.5 1.6 1.0 0.8 0.4 0.2 1.4 1.2 0.6 rl = 4 ? rl = 8 ? rl = 16 ? 00358-046 f i g u re 46. m a x i mu m o u t p ut p o we r v s . v sy sh utd o wn f e atu r e the ss m2211 c a n b e p u t in t o a lo w p o w e r co nsum p t ion sh u t - do wn m o de b y co nn e c t i n g pi n 1 to 5 v . i n sh u t do wn m o de, th e s s m2211 has a n extr eme l y l o w s u p p l y c u r r en t o f les s than 10 na. this ma k e s the ss m221 1 ideal f o r ba t t er y-p o w e r e d ap p l i c at i o n s . pin 1 sh o u ld b e co nn e c te d to g r o u nd fo r n o r m a l o p er a t ion. c o nn ectin g p i n 1 t o v dd m u t e s th e ou t p u t s and p u ts t h e de vice in to sh utdo w n m o de. a p u l l -up o r p u l l -do w n r e sisto r is n o t r e q u ir e d . pi n 1 sh o u l d a l w a y s b e co nne c t e d to a f i xe d p o te n t ia l, ei t h er v dd o r g r o u nd , an d ne ve r b e lef t f l o a t i ng . l e a v in g pi n 1 un co nn ec t e d cou l d p r o d uce u n p r edic tab l e r e s u l t s. autom a tic shutd o w n -sensi ng circuit f i gur e 47 sh o w s a cir c ui t tha t can b e us ed t o take the ss m2211 in and o u t o f sh u t do w n m o d e a u to ma t i ca l l y . t h is cir c ui t ca n be s e t t o t u r n t h e ss m2211 o n when an in p u t s i g n al o f a cer t a i n a m pli t ude is de te c t e d . th e cir c u i t a l s o p u ts t h e de vice in t o lo w p o w e r sh u t do w n m o de if a n in p u t sig n a l is n o t s e n s e d wi t h i n a cer t a i n am o u n t o f t i m e . this ca n b e us ef u l i n a va r i e t y o f p o r t a b le radio a p plica t io n s w h e r e p o w e r co n s er va t i on is cr i t i c a l . ssm2211 v in v dd c2 r5 r6 r1 r3 r2 d1 c1 r4 r7 4 v dd op181 a2 1 5 r8 a1 ? + v dd 8 note additional pins omitted for clarity 00358- 047 f i gure 4 7 . a u to ma t i c sh ut d o wn cir c uit
ssm2211 rev. c | page 17 of 20 th e i n put s i g n a l to t h e s s m 2 2 1 1 i s a l s o c o nne c te d to t h e non- in ver t in g t e r m inal o f a2. r1, r 2 , a nd r3 s e t t h e t h r e sh old v o l t a g e f o r wh en t h e ss m2211 is t o be t a k e n ou t o f s h u t do wn m o de . d1 h a l f- wa v e r e c t if ies t h e o u t p ut o f a2, dis c ha rg in g c1 t o gr o u n d wh e n a n in p u t s i gnal gr ea t e r th a n th e se t th r e s h o l d v o l t a g e is det e c t e d . r4 con t r o ls t h e cha r g e t i m e o f c1, w h ich s e ts t h e t i m e u n til the ss m2211 is p u t back in t o s h u t do wn m o de a f ter t h e i n p u t sig n a l is no lo n g er dete c t e d . r5 a nd r6 a r e u s e d t o est a b l i s h a v o l t a g e r e fer e n c e p o i n t e q ual t o half o f th e s u p p l y v o l t a g e . r7 a nd r8 s e t t h e ga in o f t h e ss m2211. d1 sh o u ld be a 1n9 14 o r eq ui valen t dio d e an d a2 s h o u l d be a ra il -t o-ra il o u t p u t am p l if ier , s u c h as a n o p 181 o r e q ui vale n t . this en s u r e s t h a t c1 dis c ha rges s u f f i cien t l y t o b r i n g th e s s m2211 ou t o f s h u t do wn m o de . t o f i n d t h e a p p r o p r i a t e co m p onen t v a l u es, f i rs t t h e gain o f a2 mu s t b e d e t e r m i n e d by ths sy min v, v v a = ( 1 2 ) w h er e: v sy is t h e s i ng l e su p p ly vol t age. v ths i s th e th r e sh o l d v o l t a g e . a v s h o u l d b e s e t t o a minim u m o f 2 f o r th e cir c ui t t o w o rk prop e r l y . ne x t c h o o s e r1 a nd s e t r2 to ? ? ? ? ? ? ? ? ? = v a r1 r2 2 1 (13) fi n d r3 as: ( 1 ? + = v a r2 r2 r2 r1 r3 ) ( 1 4 ) c1 ca n be a r b i tr a r il y s e t b u t sh ou ld be smal l eno u g h t o k e ep a2 f r o m beco min g ca p a ci t i v e l y o v erlo aded . r4 and c1 co n t r o l the s h u t d o wn ra t e . t o p r ev e n t i n t e rm i t t e n t sh u t d o wn wi t h lo w f r eq ue n c y i n p u t si gn als, th e m i n i m u m t i m e co n s ta n t sh o u ld b e low f c1 r4 10 ( 1 5 ) w h er e f lo w is t h e lo w e s t i n p u t f r e q uen c y exp e c t e d . shutdown-circuit de sign exam ple i n t h i s exa m ple , a p o r t a b le rad i o a p plic a t io n r e q u ir es t h e ss m2211 t o be t u r n ed o n w h en a n in p u t sig n al g r ea t e r tha n 50 mv is det e c t ed . th e de vice sh o u ld r e t u r n t o s h u t do wn m o de wi thin 500 m s af t e r th e in p u t sig n al is n o lo n g er det e c t e d . the l o we st f r e q u e nc y of in te re st is 2 0 0 h z , and a 5 v su p p ly is u s e d . t h e m i n i m u m g a i n of t h e s h ut d o w n c i rc u i t f r om e q u a t i on 1 2 i s a v = 100. r1 is s e t t o 100 k?. u s in g e q u a tio n 1 3 a nd e q u a tio n 14, r2 = 98 k? a nd r3 = 4.9 m ? . c1 is s e t t o 0 . 01 f , a n d bas e d o n e q ua tio n 15, r4 is s e t t o 10 m? . t o minimize p o w e r su p p ly c u r r en t, r5 and r6 a r e s e t t o 10 m?. the p r e v io us p r o c e d ur e p r o v ides a n ade q ua t e s t a r tin g p o in t f o r th e s h u t do wn c i r c ui t. s o m e co m p o n en t v a l u e s m a y n eed t o be ad j u s t ed e m p i ri call y t o opt i m i z e p e r f or m a nc e. start-up popping noise d u r i n g p o w e r - u p o r r e le as e f r o m sh u t do wn mo de, t h e mi dr a i l b y pa s s ca pa c i t o r , c b , det e r m in es th e r a t e a t whic h t h e ss m2211 st ar ts u p . by adju st ing t h e charg i ng t i me c o nst a n t of c b , t h e s t a r t-u p p o p n o is e can b e p u sh e d in t o t h e sub a u d ib le ra n g e , g r e a t l y re d u c i ng st ar t - up p o ppi n g noi s e. o n p o we r - up , t h e m i d r a i l b y pa s s ca pa c i t o r i s c h a r g e d th r o u g h a n e f f e cti v e re s i st anc e of 2 5 k ? . t o m i n i m i z e st ar t - up p o ppi ng , t h e ch arg i ng tim e co n s ta n t f o r c b s h o u ld be gr ea t e r th a n th e c h a r gi n g tim e co n s tan t f o r th e in p u t co u p lin g ca p a ci t o r , c c . c b 25 k? > c c r 1 (16) f o r a n a p plic a t i o n w h er e r1 = 10 k? a nd c c = 0.22 f , th e m i d r a i l b y pa s s ca pa c i t o r , c b , sho u ld be a t le as t 0.1 f t o mini mi ze st a r t- u p p o p p i n g n o is e. ssm2211 amplifier design exampl e ma x i mu m o u t p u t p o w e r 1 w i n p u t i m p e dan c e 20 k? loa d i m pe da n c e 8 ? inp u t l e v e l 1 v r m s b a n d wid t h 20 h z ? 20 kh z 0.25 db the co nf igura t i o n sh o w n in f i g u r e 42 is us e d . the f i rst t h in g to de te r m i n e is t h e mini m u m su p p ly r a i l ne c e ss ar y to ob t a i n t h e s p ecif ie d maxim u m ou t p u t p o w e r . f r o m f i gure 46, f o r 1 w o f o u t p u t p o w e r in t o a n 8 ? lo ad , t h e su p p l y v o l t a g e m u s t be a t leas t 4.6 v . a s u p p l y ra il o f 5 v ca n be easil y ob ta in ed f r o m a v o l t a g e r e fer e n c e . th e ext r a su ppl y v o l t a g e als o al lo ws t h e ss m2211 t o r e p r o d uce p e aks in exces s o f 1 w wi t h o u t c l i p p i ng th e si gn al . w i th v dd = 5 v a nd r l = 8 ?, e q ua t i o n 9 sh o w s tha t th e maxim u m p o w e r dis s i p a t ion f o r th e ss m22 11 is 633 mw . f r o m the p o w e r dera tin g c u r v e in f i gur e 31, t h e a m b i en t t e m p era t ur e m u s t b e les s than 7 3 c f o r th e so i c a nd 118c f o r t h e lfcs p . the r e q u ir e d ga in o f t h e am plif i e r ca n b e d e t e r m i n e d f r o m e q ua tion 17 as 8 . 2 = = rms in, l l v v r p a ( 1 7 )
ssm2211 rev. c | page 18 of 20 f r om e q u a t i on 1 2 v f a ri r = or r f = 1.4 ri . b e ca us e t h e de sir e d i n p u t im p e dan c e is 20 k? , ri = 20 k? a nd r2 = 28 k?. the f i nal des i g n s t ep is t o s e le c t t h e in p u t c a p a ci t o r . w h en add i n g an i n p u t ca p a ci t o r , c c , hig h -p as s f i l t er , t h e co r n er f r e- q u en c y n e eds t o be fa r en o u g h a w a y f o r th e des i g n t o meet t h e b a ndwi d t h cr i t e r ia . f o r a f i rst - o r der f i l t er t o achie v e a p a ss- ba nd r e s p o n s e wi thin 0.25 db , th e co r n er f r eq uen c y sh o u ld b e at l e a s t 4 . 1 4 aw ay f r o m t h e p a s s - b a n d f r e q u e n c y . s o , (4.14 f hp ) < 20 h z . u s in g e q u a tio n 2, t h e minim u m s i ze o f in p u t c a p a ci to r ca n b e fo u n d: () ? ? ? ? ? ? ? > 14 . 4 hz 20 k 20 2 1 c c ( 1 8 ) so c c > 1.65 f . u s in g a 2.2 f is a p r ac tic a l ch o i ce f o r c c . t h e ga in ba n d wi d t h p r od uc t f o r ea c h in t e rn a l a m p l i f i e r in t h e ss m2211 is 4 mh z. b e c a us e 4 mh z is m u c h g r ea t e r than 4.14 20 kh z, t h e desig n m e ets th e u p p e r f r eq uen c y ba ndwid t h cr i t er ia . the ss m2211 co u l d als o be co nf igur e d f o r hig h er dif f er en t i a l ga ins w i t h o u t r u nni n g in to b a n d wi d t h l i m i t a t i o n s. e q ua tion 16 sh o w s a n a p p r o p r i a t e val u e fo r c b t o r e d u ce s t a r t- up p o ppi ng noi s e : ( ) ( ) f 76 . 1 k 25 k 20 f 2 . 2 = ? ? > b c (19) se l e c t i n g c b t o be 2.2 f f o r a p r ac tical val u e o f ca p a ci t o r mini mi zes st a r t-u p p o p p in g n o is e. t o summa r i ze t h e f i na l desig n : v dd 5 v r1 20 k? r f 28 k? c c 2.2 f c b 2.2 f ma x . t a 85c single-ended ap plica t io ns ther e a r e a p pli c a t io n s in w h ich dr i v in g a sp e a ker dif f er en t i a l ly is n o t p r ac t i cal. an exa m ple w o u l d b e a p a ir o f s t er e o s p e a k e rs w h er e t h e min u s t e r m inal o f b o t h s p e a k e rs is c o nn e c t e d t o g r o u n d . f i gur e 48 s h o w s h o w t h is ca n be accom p lish e d . ssm2211 5v 2 7 1 8 5 6 4 3 0.47 f 470 f + ? + ? 10k ? 10k ? 250mw speaker (8 ? ) audio input 0.1 f 00358-048 ssm2211 5v 2 7 1 8 5 6 4 3 0.47 f 470 f + ? + ? 10k ? 10k ? 250mw speaker (8 ? ) audio input 0.1 f 00358-048 f i gure 48. a sing le -end ed o u t p ut a p pl ic at io n i t is n o t n e ce ss ar y t o co nn e c t a d u m m y lo ad t o t h e u n us e d o u t p u t t o he l p sta b il ize t h e o u t p u t . th e 470 f c o u p lin g c a p a c i tor c r e a te s a h i g h - p a s s f r e q u e nc y c u tof f , a s g i ve n i n e q ua tion 4, o f 4 2 h z , which is accep t ab le f o r mos t co m p u t er sp e a k e r a p plic a t io n s . t h e o v era l l ga in fo r a sin g l e -e n d e d o u t p u t co nf igura t io n is a v = r f /r 1 , w h i c h fo r t h is exa m ple is e q ual t o 1. drivi n g tw o spea kers single end e dly i t i s p o ss ibl e to d r ive t w o sp e a k e rs s i ng l e e n d e d l y w i t h b o t h o u t p u t s o f the s s m2211. ssm2211 5v 2 7 1 8 5 6 4 3 1 f 470 f + ? + ? 20k ? 20k ? right speaker (8 ? ) a udio input 0.1 f 00358-049 470 f + ? left speaker (8 ? ) f i gur e 4 9 . ssm2211 use d a s a dua l -sp e a k er a m pl i f i e r e a ch sp e a k e r is dr i v en b y a si n g le ende d o u t p u t . the t r ade - o f f is tha t o n l y 250 mw o f s u s t a i n e d p o w e r can be p u t in t o eac h s p eak e r . als o , a co u p lin g c a p a ci t o r m u s t be co nn ec ted in s e r i es wi t h e a ch o f t h e s p e a k e rs t o p r e v en t la rg e dc c u r r en ts f r o m f l o w i n g th r o u g h th e 8 ? s p e a k e r s . t h e s e c o u p li n g ca pa c i t o r s p r o d uce a hig h - p ass f i l t er w i t h a co r n er f r e q uen c y g i ven b y e q ua t i on 4. f o r a sp e a k e r lo ad of 8 ? a n d a co uplin g c a p a ci t o r o f 470 f , this r e s u l t s in a ?3 db f r eq uen c y o f 42 h z . b e c a u s e t h e p o we r of a s i ng l e - e n d e d output i s one q u ar te r t h at o f a b r idge d o u t p u t , b o t h sp e a kers t o get h er a r e st i l l ha lf as lo ud (?6 db s p l) as a sin g le sp e a k e r dr i v en w i t h a b r idge d o u t p ut. the p o la r i ty o f t h e sp e a k e rs is i m p o r t a n t, as e a ch o u t p u t is 180 out of ph a s e w i t h t h e ot he r . by c o n n e c t i ng t h e m i n u s te r m i n a l o f s p eak e r 1 t o p i n 5, an d the pl us t e r m inal o f s p eak e r 2 t o p i n 8, p r o p er s p e a ker phas e ca n b e es t a b l is he d .
ssm2211 rev. c | page 19 of 20 the max i m u m p o w e r diss i p a t i o n o f t h e de vi ce ca n b e fo u n d b y do u b l i n g e q ua tio n 11, as s u ming bo t h lo ads a r e eq ual . i f t h e lo ads a r e dif f er en t, us e e q ua t i on 11 t o f i nd t h e p o w e r dis s i p a- t i o n ca u s e d b y ea c h l o a d , th e n ta k e th e s u m t o fi n d th e t o t a l p o w e r dis s i p a t e d b y t h e s s m22 11. w h e n y o u ha v e d e t e rmin ed t h e c l osed - l oo p ga in r e q u i r ed b y yo ur s o ur ce lev e l , an d can develo p 1 w acr o s s th e 8 ? lo ad r e si s t o r w i t h t h e n o rm al in p u t sign al lev e l , r e p l ace t h e r e si s t o r wit h you r sp e a ke r . y o u r sp e a ke r ma y b e c o n n e c te d ac ro ss t h e v o1 and v o2 p o sts fo r b r idge d mo de o p er a t io n on ly a f ter t h e 8 ? lo ad r e sis t o r is r e m o v e d. f o r n o p h as e in v e rsio n, v o2 sh o u ld b e c o n n e c te d to t h e ( + ) te r m i n a l of t h e s p e a ke r . evaluation board an eval u a t ion b o a r d f o r th e ss m2211 is a v a i lab l e . f o r m o r e inf o r m a t io n, cal l 1-800-an alo g d . 8 ssm2211 5 v o2 gnd ch a ch b probes ch b inv. on display a+b oscilloscope 2.5v common mode v o1 8 ? 1w 00358-051 v+ 8 4 ssm2211 5 3 2 1 v o2 6 j1 j2 c1 0.1 f 7 c in 1 f cw on shutdown r1 51k ? + + r in 20k ? r f 20k ? v o1 r l 1w 8 ? volume 20k ? pot. audio input c1 0.1 f c2 10 f 00358-050 f i g u re 51. u s ing an o s cil l o s c ope t o d i s p lay t h e br idg e d o u t p ut v o lt ag e f i g u re 50. ev aluat i on b o a r d s c h e m a t i c the v o l t a g e ga in o f the ss m22 11 is g i v e n b y e q ua t i o n 20 in f v r r a = (20) t o us e th e s s m 2211 in a s i n g le-ende d o u t p u t c o nf igura t io n, r e place j1 and j 2 j u m p ers wi t h ele c t r oly t ic ca p a ci t o rs o f a s u i t a b l e v a l u e , w i t h th e n e g a ti v e t e rm i n a l s t o t h e o u t p u t te r m i n a l s v o1 and v o2 . th e sing le-e n d e d lo ads ma y t h en be re t u r n e d to g r ou nd. n o te t h a t t h e m a x i m u m out p ut p o we r i s r e d u ced t o 250 mw , o n e-q u a r ter o f th e ra t e d maxim u m, d u e t o t h e max i m u m s w i n g i n t h e n o n b r i dge d m o de b e in g on e-h a l f, an d p o we r b e i n g prop or t i on a l to t h e s q u a re of t h e vo lt age. f o r f r eq uen c y r e s p o n s e do wn 3 db a t 100 h z , a 200 f ca p a ci t o r is r e q u i r ed w i th 8 ? s p eak e r s . the ss m2211 e v al u a tion bo a r d als o co m e s wi t h a sh u t do wn swi t ch, w h ich al lo ws t h e us er t o swi t ch b e tw e e n o n (n o r mal o p er a t ion) a nd t h e p o w e r - co n s er vin g sh utdo w n m o d e . i f desir e d , the in p u t sig n al ma y be a t t e n u a t e d b y t u r n in g t h e 10 k? p o t e n t iom e t e r in t h e c w d i r e c t io n. c in is ola t es t h e i n p u t co mm on-m o d e v o l t a g e (v d /2) p r es en t a t pin 2 a nd 3. w i t h v+ = 5 v , t h er e is 2.5 v co mm o n - m o d e v o l t a g e p r es en t a t b o t h output te r m i n a l s , v o1 and v o2 , as w e l l . lfcsp pri n ted circui t board lay o ut consi d era t io ns the lfcs p is a plast i c e n ca psu l a t e d p a cka g e w i t h a cop p er le a d f r a m e s u bs tra t e . this is a le adless p a c k a g e wi th s o lder la n d s o n t h e b o t t om s u r f ace o f t h e p a ckag e in s t e a d o f con v e n t i o n al fo r m e d p e r i meter l e ads. a ke y fe a t u r e t h a t a l l o ws t h e u s er to re a c h t h e qu o t e d ja p e r f o r ma nce is t h e exp o s e d die a t t a ch p a ddle (d ap) o n t h e b o t t o m s u r f ace o f t h e p a cka g e . w h e n s o lder e d t o t h e pcb , t h e d a p c a n p r o v ide ef f i c i en t cond uc t i on o f h e a t f r o m t h e die t o t h e pcb . f o r t h e us er t o achie ve o p t i m u m p a ckag e p e r f o r ma n c e, co n s idera t io n s h o u l d b e g i v e n t o t h e pcb p a d desig n fo r b o t h t h e s o lder lan d s a nd t h e d a p . f o r f u r t h e r info r m a t io n t h e us e r is dir e c t e d t o t h e a m k o r t e c h n o log y do c u m e n t , a p p lic a tio n n o t e s f o r s u r f ace m o un t a s sem b l y o f amk o r s m i cr ole a d f r am e (mlf ) p a c k a g es. t h is ca n b e do wn lo a d e d f r o m t h e a m k o r t e ch n o lo g y w e bsi t e, w w w . a m k o r . com, as a p r o d uc t a p plic a t ion n o t e . ca uti o n: the g r o u n d le ad of th e os cil l os cop e p r obe , o r an y o t h e r in s t r u m e n t us ed t o measur e th e ou t p u t s i g n al , m u s t n o t b e c o n n e c te d to e i t h e r output , a s t h i s wou l d s h o r t out one of t h e a m plif ier s o u t p u t s an d p o ss i b ly da m a ge t h e de vic e . a s a fe m e t h o d o f displ a y i ng t h e dif f er en t i a l o u t p u t s i g n a l using a g r ou nd e d s c o p e i s s h ow n i n fi g u re 5 1 . c o n n e c t c h an nel a s p r ob e t o t h e v o2 ter m ina l p o st, co nn e c t c h a n nel b s p r o b e to th e v o1 p o st, i n ver t c h a nnel b a nd ad d t h e tw o cha nnels t o g e th er . m o s t m u l t ic h a nn e l os cillosco pes h a v e th is f e a t ur e b u il t in. i f you m u st c o nne c t t h e g r ou nd l e ad of t h e te st i n st r u me n t to e i t h e r output s i g n a l pi ns , a p o we r - l i ne i s o l a t i o n t r ans f or me r m u s t b e us e d t o is ola t e t h e i n s t r u m e n t g r o u n d f r o m t h e p o w e r su p p ly g r ou nd. rec a ll tha t v = p r , so th en f o r p o = 1 w a nd r l = 8 ?, v = 2.8 v r m s, o r 8 v p-p . i f t h e a v a i lab l e in p u t sig n al is 1.4 v r m s o r m o r e , us e t h e b o a r d as is , wi t h r f = r i = 20 k?. i f m o r e ga i n i s n eed e d , in cr ea s e t h e v a l u e o f r f .
ssm2211 rev. c | page 20 of 20 outline dimensions 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5. 00 ( 0 . 1 9 68) 4. 80 ( 0 . 1 8 90) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012aa f i g u re 52. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic ] narro w b o dy (r -8), s-suffix di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) 1 ex po s e d pa d (b o t t o m v i e w ) 0.50 bsc 0.60 max pin 1 indicator 1.50 ref 0.50 0.40 0.30 0.25 min 0.45 2.75 bsc sq top view 12 max 0.80 max 0. 65 t y p seating plane pin 1 indicato r 0.90 0.85 0.80 0.30 0.23 0.18 0.05 max 0.02 nom 0.20 ref 1.90 1.75 1.60 4 1.60 1.45 1.30 3.00 bsc sq 5 8 f i gure 53. 8-l e ad f r a m e c h ip s c al e p a ck age [l fcsp ] 3 mm 3 m m b o d y (cp - 8- 2) di me nsio ns sho w n i n mi ll im e t e r s ordering guide model temperature r a nge package de scri ption package options brand SSM2211CP-R2 ? 20c to +85c 8-lead lfcsp cp-8-2 b5a ssm2211cp-ree l ? 20c to +85c 8-lead lfcsp cp-8-2 b5a ssm2211cp-ree l 7 ? 20c to +85c 8-lead lfcsp cp-8-2 b5a ssm2211cpz-reel 1 ? 20c to +85c 8-lead lfcsp cp-8-2 b5a ssm2211cpz-reel7 1 ? 20c to +85c 8-lead lfcsp cp-8-2 b5a ssm2211s ? 20c to +85c 8-lead soic r-8 (s-su ffix) ssm2211s-reel ? 20c to +85c 8-lead soic r-8 (s-su ffix) ssm2211s-reel7 ? 20c to +85c 8-lead soic r-8 (s-su ffix) ssm2211sz 1 ? 20c to +85c 8-lead soic r-8 (s-su ffix) ssm2211sz-ree l 1 ? 20c to +85c 8-lead soic r-8 (s-su ffix) ssm2211sz-ree l 7 1 ? 20c to +85c 8-lead soic r-8 (s-su ffix) 1 z=pb-free part. ? 2004 anal og de vices, inc. all rights reserve d . tra d em arks and registered trade m ar ks are the pr op erty of their respective own e rs. c00358-0-10/04( c)

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