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myland preliminary MY8008 rev.1.0 june 15, 2005 2 . reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers are responsible for their products and applications using components. note that the external components or pcb layout should be designed not to generate abnormal voltages to the chip to prevent from latch up which may cause damage to the device. typical application s1 switch + c13 10uf c6 1uf c9 1uf c5 1uf l1 33uh c7 1uf 1 20 2 19 3 18 4 17 5 16 6 15 7 8 loutp vdd rinn linp linn nc rinp nc gnd loutn vdd sdnb avdd agnd routp vdd 9 10 14 13 cap vdd routn gnd 11 12 jp1 2 c10 1uf l2 33uh c8 1uf l3 33uh c12 1uf l4 33uh in1- in1+ in2+ in2- sdn r6 22k r7 22k r8 22k r9 22k vdd vo1+ vo1- vo2- vo2+ r5 100 r3 100 r4 100 j1 phonejack stereo r10 100k c1 0.47uf c2 0.47uf c3 0.47uf c4 0.47uf c11 1uf r2 0 r1 0 c14 470p c15 470p absolute maximum ratings over operating free-air temperature range unless otherwise noted(1) in normal mode -0.3v to 6v v supply voltage, v dd, av dd in shutdown mode -0.3v to 7v v input voltage, v i -0.3v to v dd +0.3v v continuous total power dissipation see package dissipation ratings operating free-air temperature, t a -20 to 85 c operating junction temperature, t j -20 to 150 c storage temperature, t stg -40 to 150 c (1) stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
myland preliminary MY8008 rev.1.0 june 15, 2005 3 kohms 20 ri kohms 320 gain + = recommended operating conditons min nom max unit supply voltage, v dd, av dd 2.5 5.5 v high-level input voltage, v ih sdnb 2 v dd v low-level input voltage, v il sdnb 0 0.8 v operating free-air temperature, t a -20 85 c package dissipation ratings packge derating factor t a 25 c power rating t a = 70 c power rating t a = 85 c power rating tssop20 8.73 mw/ c 1.09w 698mw 567mw electrical characteristics t a =25 c (unless otherwise noted) parameter test conditions min typ max unit v os output offset voltage (measured differentially) v i =0v,a v =2, v dd =av dd =2.5v to 5.5v 25 mv psrr power supply rejection ratio v dd =av dd =2.5v to 5.5v -75 -55 db cmrr common mode rejection ratio v dd =av dd =2.5v to 5.5v, v ic =1vpp, rl=8 -55 -50 db i ih high-level input current v dd =av dd =5.5v, v i =5.8v (sdnb) 30 a i il low-level input current v dd =av dd =5.5v, v i =-0.3v (sdnb) 1 a i q quiescent current / ch v dd =av dd =5v, no load 2.2 3 ma i q (sd) shutdown current / ch v ( sdn ) =0.8v, v dd =av dd =2.5v to 5.5v 0.2 0.5 a r ds(on) static output resistance v dd =av dd =5.5v 790 m f(sw) switching frequency v dd =av dd =2.5v to 5.5v 200 250 300 khz *av btl gain v dd =av dd =2.5v to 5.5v, rl=8 12 16 20 v v r sdn resistance from shutdown to gnd v ( sdnb ) =5v 200 k z i input impedance rinn,rinp,linn,linp 20 k *the gain of the amplifier is determined by, for v dd =v dda =2.5v to 5.5v where ri is the external serial resistance at the input pin.
myland preliminary MY8008 rev.1.0 june 15, 2005 4 operating characteristics t a =25 c, r l =8 speaker (unless otherwise noted) parameter test conditions min typ max unit r l =8 1.5 w r l =4 2.3 w p o output power / ch r l =3 v dd =av dd =5v. thd+n=10%,f=1khz. 2.7 w v dd =av dd =5v, p o =0.85w, r l= 8 , f=1khz 0.55 v dd =av dd =5v, p o =1.3w, r l= 4 , f=1khz 0.55 thd+n total harmonic distortion plus noise v dd =av dd =5v, p o =1.5w, r l= 3 , f=1khz 0.64 % snr signal-to-noise ratio v dd =av dd =5v, p o =1w, r l= 8 85 db crosstalk crosstalk between outputs v dd =av dd =5v, p o =1w r l =8 -60 db terminal functions terminal name pin no i/o description agnd 15 - analog ground av dd 16 - analog power supply cap 14 i capacitance for power up delay gnd 11,20 - digital ground linn 5 i negative input of left channel linp 4 i positive input of left channel loutn 19 o negative output of left channel loutp 1 o positive output of left channel nc 3,8 - no connection rinn 6 i negative input of right channel rinp 7 i positive input of right channel routn 12 o negative output of right channel routp 10 o positive output of right channel sdnb 17 i shutdown terminal (active low logic) v dd 2,9,13,18 - digital power supply typical characteristics note 1. input coupling 1 f capacitors are used for all measurements. 2. differential inputs are applied and btl outputs are measured. 3. balanced lc filter is used for thd+n measurement and power efficiency measurement. 4. characteristic frequency of the lc filter is set 41khz unless otherwise specified.
myland preliminary MY8008 rev.1.0 june 15, 2005 5 application information
myland preliminary MY8008 rev.1.0 june 15, 2005 6
myland preliminary MY8008 rev.1.0 june 15, 2005 7 kohms 20 ri kohms 320 gain + = l input resistors and gain the gain of the amplifier is determined by, for vdd=vdda =2.5v to 5.5v where ri is the external serial resistance at the input pin. note please refer to document 010 app for more application examples. detailed description efficiency the output transistors of a class d amplifier act as switches. the power loss is mainly due to the turn on resistance of the output transistors when driving current to the load. as the turn on resistance is so small that the power loss is small and the power efficiency is high. with 8 ohm load the power efficiency can be better than 85%. shutdown the shutdown mode reduces power consumption. a low at shutdown pin forces the device in shutdown mode and a high forces the device in normal operating mode. shutdown mode is useful for power saving when not in use. this function is useful when other devices like earphone amplifier on the same pcb are used but class d amplifier is not necessary.
myland preliminary MY8008 rev.1.0 june 15, 2005 8 pop-less a soft start capacitor can be added to the cap pin. this capacitor introduces delay for the internal circuit to be stable before driving the load. the pop or click noise when power up/down or switching in between shutdown mode can be thus eliminated. the delay time is proportional to the value of the capacitance. it is about 500ms for a capacitor of 1uf at 5v. voltage gain the voltage gain is defined in the table on page 3. for lower voltage gain one can add external input resistors to input pins. if external resistors are used they should be well matched. well matched input resistors are also required even for single ended input configuration for low noise. automatic output power control (apc) the voltage gain is self adjusted in the chip over voltage range. this means that, regardless supply voltage change, the output power keeps about the same for a given input level from vdd=5.5v to 2.5v. it allows the best use of the battery. differential input vs single ended input differential input offers better noise immunity over single ended input. a differential input amplifier suppresses common noise and amplifies the difference voltage at the inputs. for single ended applications just tie the negative input end of the balanced input structure to ground. if external input resistors are used, the negative input has to be grounded with a series resistor of the same value as the positive input to reduce common noise. output filter ferrite bead filter can be used for emi purpose. the ferrite filter reduces emi around 1 mhz and higher fcc and ce only test radiated emissions greater than 30 mhz . when selecting a ferrite bead, choose one with high impedance at high frequencies, but low impedance at low frequencies. use an lc output filter if there are low frequency 1 mhz emi sensitive circuits and/or there are long wires from the amplifier to the speaker. emi is also affected by pcb layout and the placement of the surrounding components.
myland preliminary MY8008 rev.1.0 june 15, 2005 9 the suggested lc values for different speaker impendence are showed in following figures for reference. typical lc output filter, cutoff frequency of 41 khz, speaker impedance=3 & 4 0.1 f 0.1 f vo+ vo- 33 h 33 h 0.47 f typical lc output filter, cutoff frequency of 41 khz, speaker impedance=8 other lc output filter, speaker impedance=3 & 4
myland preliminary MY8008 rev.1.0 june 15, 2005 10 other lc output filter speaker impedance=8 100pf 100pf vo+ vo- ferrite chip bead ferrite chip bead typical ferrite chip bead filter 1kohms@100mhz, dcr=0.2ohms, i=1a over temperature protection a temperature sensor is built in the device to detect the temperature inside the device. when a high temperature around 145oc and above is detected the switching output signals are disabled to protect the device from over temperature. automatic recovery circuit enables the device to come back to normal operation when the internal temperature of the device is below around 120oc. over current protection a current detection circuit is built in the device to detect the switching current of the output stages of the device. it disables the device when the current is beyond about 3.5amps. it protects the device when there is an accident short between outputs or between output and power/gnd pins. it also protects the device when an abnormal low impedance is tied to the output. high current beyond the specification may potentially causes electron migration and permanently damage the device. shutdown or power down is necessary to resolve the protection situation. there is no automatic recovery from over current protection.
myland preliminary MY8008 rev.1.0 june 15, 2005 11 physical dimensions (in millimeters) 4.16 typ 7.72 typ 0.42 typ 0.65 typ (1.78 typ) land pattern
d ????l1|a??? 2 ??ea1|a?? y^??p?1???3? y^???p?1?????1??a?3? ?l??3?1??rg??mo???y??a? ??ea1|a?? class - d vs class - ab 0 0.2 0.4 0.6 0.8 1 1.2 0 10 20 30 40 50 60 70 80 90 100 e f f i c i e n c y - % po- output power - w efficiency vs output power class-ab class-d 0 2 4 6 8 10 12 0 2 4 6 8 10 12 14 16 18 pout(w) p d ( w ) class-d class-ab output power total power power eff (power supply) heat class - ab 10w 40% 10w / 40%=25w 25w - 10w=15w class - d 10w 90% 10w / 90%=11.1w 11.1w - 10w=1.1w

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