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features applications 3w output at 10% thd with a 4 load and 5v supply supply voltage from 2.5v to 5.5 v efficiency up to 89% superior low noise without input few external components to save the space and cost short circuit protection thermal shutdown space saving packages : 2mmx2mmwcsp 4mm x 4mm thin qfn lcd monitor / tv projector notebook computers portable speakers portable dvd players, game machines cellular phones/speaker phones qfn (wcsp) pam8404 pam8404 pam8404 a-weighted and wcsp 2mmx2mm description the pam8404 is a 3w high efficiency filterless class-d audio amplifier in 4mmx4mm and 2mmx2mm wafer chip scale packages that requires few external components. features like 89% efficiency, -63db psrr, improved rf-rectification immunity, and very small pcb area make the class-d amplifier ideal for cellular handset and pda applications. in cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the . the allows independent gain by summing signals from seperate sources, and has as low as 43 v noise floor. pam8404 is available in qfn 4mmx4mm packages. pb-free packages typical application circuit 1 www.poweranalog.com , power analog microelectronics inc pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1 fcc class b limit radiated emissions agnd sdl sdr inl- inl+ inr- inr+ g0 g1 av dd pvdd pgnd pa m84 04 outl- outl+ outr- ou tr + 0.22f 0.22f 0.22f 0.22f inr+ inr- inl+ inl- off on on off 10f 1f vdd 1f 10f g1 g0 vdd
block diagram 2 bandgap + - pam modulation h- bridge gnd outr- outr+ c s to battery v dd internal oscillator gain adjust + - inr+ inr- + - pam modulation h- bridge outl- outl+ gain adjust + - inl+ inl- g0 g1 300k 300k short-circuit protection otp sdr sdl www.poweranalog.com , power analog microelectronics inc pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
pin descriptions 3 pin configuration & marking information , power analog microelectronics inc wcsp 2mmx2mm top view inl+ pvdd outl+ inl- g1 sdr inr- g0 agnd outl- sdl pgnd inr+ avdd outr+ outr- b1 c1 d1 a1 a2 a3 a4 qfn 4mmx4mm top view name pin number description g1 1 b2 gain select (msb) outl+ 2 a3 left channel positive differential output pvdd 3,13 a2 power supply (must be same voltage as avdd) pgnd 4,12 c4 power ground outl- 5 a4 left channel negative differential output nc 6,10 - no connect sdl 7 b4 left channel shutdown terminal (active low) sdr 8 b3 right channel shutdown terminal (active low) avdd 9 d2 analog supply (must be same voltage as pvdd) outr- 11 d4 right channel negative differential output outr+ 14 d3 right channel positive differential output g0 15 c2 gain select (lsb) inr+ 16 d1 right channel positive input inr- 17 c1 right channel negative input agnd 18 c3 analog ground inl- 19 b1 left channel negative input inl+ 20 a1 left channel positive input www.poweranalog.com 1 2 3 4 5 6 7 8910 11 12 13 14 15 16 17 18 19 20 g1 outl+ pvdd pgnd outl- nc sdl sdr avdd nc outr- pgnd pvdd outr+ g0 inl+ inl- agnd inr- inr+ p8404 xxxyw fr yw (marking) fr: product code of pam8404 x: internal code y: year w: week pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
absolute maximum ratings these are stress ratings only and functional operation is not implied. exposure to absolute maximum ratings for prolonged time periods may affect device reliability. all voltages are with respect to ground . supply voltage ...........................................6.0v input voltage.............................-0.3v to v +0.3v storage temperature.....................-65 to 150 soldering temperature.................... . dd maximum junction temperature..................150c c c 250c,10 sec recommended operating conditions supply voltage range........................ operation temperature range.........-40 to 85 junction temperature range.........-40 to 125 2.5v to 5.5v c c c c thermal information 4 , power analog microelectronics inc www.poweranalog.com parameter symbol package maximum unit wcsp2x2-16 64 thermal resistance (junction to ambient) ja qfn4x4-20 31 c/w wcsp2x2-16 - thermal resistance (junction to case) jc qfn4x4-20 13 c/w pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
5 electrical characteristic qfn 4x4 20-pin t=25 a avdd=pvdd=5v, gnd=pgnd=0v, unless otherwise noted. c, , power analog microelectronics inc www.poweranalog.com parameter symbol test conditions min typ max unit supply voltage v dd 2.5 5.5 v v dd =5v 3 thd+n=10% f=1khz r l =4 v dd =3.6v 1.5 w v dd =5v 2.35 thd+n=1% f=1khz r l =4 v dd =3.6v 1.2 w v dd =5v 1.7 thd+n=10% f=1khz r l =8 v dd =3.6v 0.9 w v dd =5v 1.4 output power p o thd+n=1% f=1khz r l =8 v dd =3.6v 0.7 w v dd =5.0v,po=0.5w,r l =8 0.15 v dd =3.6v,po=0.5w,r l =8 f=1khz 0.27 % v dd =5.0v,po=1w,r l =4 0.23 total harmonic distortion plus noise thd+n v dd =3.6v,po=1w,r l =4 f=1khz 0.24 % f=100hz -48 power supply ripple rejection psrr v dd =5.0v, inputs ac-grounded with cin=1f f=1khz -63 db crosstalk cs v dd =5v,po=0.5w,r l =4,gv=23db f=1khz -93 db signal-to-noise ratio snr v dd =5v, vorms=1v,gv=23db a-weighting 87 db v dd =5v, inputs ac-grounded with cin=1f a-weighting 43 output noise vn bw 22hz-22khz no a-weighting 59 v dynamic range dyn v dd =5.0v, thd=1% a-weighting 97 db r l =8, thd=10% 89 efficiency r l =4, thd=10% f=1khz 84 % v dd =5v 11 quiescent current i q v dd =3.6v no load 6 ma shutdown current i sd v dd =5.5v vsd=0.3v < 1 a pmos 250 static drain-to-source on-state resistor rdson i ds =500ma,vgs=5v nmos 170 m switching frequency fsw v dd =3v to 5v 300 khz output offset voltage vos vin=0v, v dd =5v 10 mv g0=l g1=l 6 g0=h g1=l 12 g0=l g1=h 18 closed-loop voltage gain gain v dd =5v r l =4 f=1khz g0=h g1=h 24 db over temperature protection otp 150 over temperature hysterisis oth no load, junction temperature 50 c pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
6 electrical characteristic wcsp 2x2-16 t=25 a avdd=pvdd=5v, gnd=pgnd=0v, unless otherwise noted. c, , power analog microelectronics inc www.poweranalog.com parameter symbol test conditions min typ max unit supply voltage v dd 2.5 5.5 v v dd =5v 2.2 thd+n=10% f=1khz r l =4 v dd =3.6v 1.2 w v dd =5v 1.8 thd+n=1% f=1khz r l =4 v dd =3.6v 1 w v dd =5v 1.5 thd+n=10% f=1khz r l =8 v dd =3.6v 0.8 w v dd =5v 1.2 output power p o thd+n=1% f=1khz r l =8 v dd =3.6v 0.6 w v dd =5.0v,po=0.5w,r l =8 0.3 v dd =3.6v,po=0.5w,r l =8 f=1khz 0.4 % v dd =5.0v,po=1w,r l =4 0.3 total harmonic distortion plus noise thd+n v dd =3.6v,po=1w,r l =4 f=1khz 0.2 % power supply ripple rejection psrr v dd =5.0v, inputs ac-grounded with cin=1f f=217hz -50 db crosstalk cs v dd =5v,po=0.5w,r l =4,gv=23db f=1khz -70 db signal-to-noise ratio snr v dd =5v, vorms=1v,gv=23db a-weighting 85 db v dd =5v, inputs ac-grounded with cin=1f a-weighting 34 output noise vn bw 22hz-22khz no a-weighting 54 v dynamic range dyn v dd =5.0v, thd=1% a-weighting 98 db r l =8, thd=10% 85 efficiency r l =4, thd=10% f=1khz 75 % v dd =5v 12 quiescent current i q v dd =3.6v no load 7 ma shutdown current i sd v dd =2.5v to 5.5v vsd=0.3v < 1 a pmos 500 static drain-to-source on-state resistor rdson i ds =500ma,vgs=5v nmos 460 m switching frequency fsw v dd =5v 300 khz output offset voltage vos vin=0v, v dd =5v 20 mv g0=l g1=l 6 g0=h g1=l 12 g0=l g1=h 18 closed-loop voltage gain gain v dd =5v r l =4 f=1khz g0=h g1=h 24 db over temperature protection otp 150 over temperature hysterisis oth no load, junction temperature 50 c pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
typical operating characteristics (t =25c) a thd+n vs output power r =8 , gain=23db, f=1khz l thd+n vs output power r =4 , gain=23db, f=1khz l 0.0 1 30 0.0 2 0.0 5 0.1 0.2 0.5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz v dd =5 . 5 v v dd =5v v dd =3. 6v thd+n vs frequency p =0.5w, r =8 , c =1 f,gain=23db olin ? thd+n vs frequency p =0.5w, r =4 , c =1 f,gain=23db olin ? 7 , power analog microelectronics inc www.poweranalog.com efficiency vs output power r=8 v =5v,l=33 h ldd , efficiency vs output power r=4 v =5v,l=33 h ldd , pam8404 3w/ch filterless stereo class-d audio amplifier 10 20 30 40 50 60 70 80 90 100 0 200 400 600 800 1000 1200 1400 1600 1800 output pow er(mw) efficiency(%) 10 20 30 40 50 60 70 80 90 100 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 output pow er(mw) efficiency(%) 0. 0 1 30 0. 0 2 0. 0 5 0. 1 0. 2 0. 5 1 2 5 10 % 10m 4 20m 50m 100m 200m 500m 1 2 w v dd =2 . 5 v v dd =3.6v v dd =5v 0. 0 1 30 0. 0 2 0. 0 5 0. 1 0. 2 0. 5 1 2 5 10 % 10m 4 20m 50m 100m 200m 500m 1 2 w v dd =2 . 5 v v dd =3.6v v dd =5v 0 . 01 30 0 . 02 0 . 05 0 . 1 0 . 2 0 . 5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz v dd =5 . 5 v v dd =5v v dd =3. 6v qfn 4x4 20-pin 03/2009 rev 1.1
8 , power analog microelectronics inc www.poweranalog.com typical operating characteristics (t =25c) a frequency response v =5v,r=4 ,c =1 f dd l in ? pssr vs frequency input ac-ground, v =5v 200mvpp, r =4 , c =1 f, gain=16db dd lin ? crosstalk vs frequency v =5v, r =4 , gain=23db dd l noise floor fft inputs ac-ground, v =5v, c =1 f, r =4 , gain=23db dd in l ? thd+n vs frequency v =5v, r =8 , c =1 f,gain=23db dd l in ? thd+n vs frequency v =5v, r =4 , c =1 f,gain=23db dd l in ? pam8404 3w/ch filterless stereo class-d audio amplifier 0.0 1 30 0.0 2 0.0 5 0.1 0.2 0.5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz p o =1.3w p o =1w p o =0.5w 0 . 01 30 0 . 02 0 . 05 0 . 1 0 . 2 0 . 5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz p o =2 w p o =1w p o =0.5w +0 +2 5 +2 .5 +5 +7 .5 +1 0 +1 2 .5 +1 5 +1 7.5 +2 0 +2 2.5 d b r a 20 20k 50 100 200 500 1k 2k 5k 10k hz g0=1g1=1 g0=0 g1=1 g0=1g1=0 g0=0 g1=0 -100 +0 -9 0 -8 0 -7 0 -6 0 -5 0 -4 0 -3 0 -2 0 -1 0 d b 20 20 k 50 100 200 500 1k 2k 5k 10 k hz l r - 120 - 65 - 115 - 110 - 105 - 100 - 95 - 90 - 85 - 80 - 75 - 70 d b 20 20k 50 100 200 500 1k 2k 5k 10k hz tt rtol ltor -120 -5 0 -11 0 -100 -9 0 -8 0 -7 0 -6 0 d b r a 20 20k 50 100 200 500 1k 2k 5k 10k hz l r qfn 4x4 20-pin 03/2009 rev 1.1
9 , power analog microelectronics inc www.poweranalog.com typical operating characteristics (t =25c) a output power vs supply voltage c =1 f, r =8 , gain=23db, f=1khz in l ? output power vs supply voltage c =1 f, r =4 , gain=23db, f=1khz in l ? quiescent current vs supply voltage no input, r =no load l frequency vs supply voltage input ac-ground pam8404 3w/ch filterless stereo class-d audio amplifier 0 2 4 6 8 10 12 14 16 22.533.544.555.56 pow er supply voltage(v) quiescent current(ma) 280 284 288 292 296 300 22.533.544.555.56 pow er supply voltage(v) frequency(khz) 0 0.5 1 1.5 2 2.5 22.533.544.555.56 pow er supply voltage(v) output power(w) 1 % 10 % 0 0.5 1 1.5 2 2.5 3 3.5 4 22.533.544.555.56 pow er supply voltage(v) output power(w) 1 % 10 % qfn 4x4 20-pin 03/2009 rev 1.1
typical operating characteristics (t =25c) a thd+n vs output power r =8 , gain=23db, f=1khz l thd+n vs output power r =4 , gain=23db, f=1khz l thd+n vs frequency p =0.5w, r =8 , c =1 f,gain=23db olin ? thd+n vs frequency p =0.5w, r =4 , c =1 f,gain=23db olin ? 10 , power analog microelectronics inc www.poweranalog.com efficiency vs output power r=8 v =5v,l=22 h ldd , efficiency vs output power r=4 v =5v,l=22 h ldd , pam8404 3w/ch filterless stereo class-d audio amplifier wcps 2x2-16 10 20 30 40 50 60 70 80 90 0 200 400 600 800 1000 1200 1400 1600 output pow er(mw) efficiency(%) 10 20 30 40 50 60 70 80 90 100 0 300 600 900 1200 1500 1800 2100 2400 output pow er(mw) efficiency(%) 0. 1 30 0. 2 0. 5 1 2 5 10 20 % 10 m 4 20 m50 m 100 m 200 m 500 m1 2 w v dd =3 . 6 v v dd =5v v dd =5.5v 0. 0 1 30 0. 0 2 0. 0 5 0.1 0.2 0.5 1 2 5 10 % 10 m 4 20 m50 m 100 m 200 m 500 m1 2 w v dd =3 . 6 v v dd =5v v dd =5.5v 0. 0 1 30 0. 0 2 0. 0 5 0.1 0.2 0.5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz v dd =5 . 5 v v dd =5v v dd =3. 6v 0. 0 1 30 0. 0 2 0. 0 5 0. 1 0. 2 0. 5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz v dd =5 . 5 v v dd =5v v dd =3. 6v 03/2009 rev 1.1
11 , power analog microelectronics inc www.poweranalog.com typical operating characteristics (t =25c) a frequency response v =5v,r=4 ,c =1 f dd l in ? pssr vs frequency input ac-ground, v =5v 200mvpp, r =4 , c =1 f, gain=5db dd lin ? crosstalk vs frequency v =5v, r =4 , gain=23db dd l noise floor fft inputs ac-ground, v =5v, c =1 f, r =4 , gain=23db dd in l ? thd+n vs frequency v =5v, r =8 , c =1 f, gain=23db dd l in ? thd+n vs frequency v =5v, r =4 , c =1 f, gain=23db dd l in ? pam8404 3w/ch filterless stereo class-d audio amplifier rtol ltor l r wcps 2x2-16 0. 0 1 30 0. 0 2 0. 0 5 0.1 0.2 0.5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz p o =1 w p o =1.2w p o =0.5w 0. 0 1 30 0. 0 2 0. 0 5 0. 1 0. 2 0. 5 1 2 5 10 20 % 20 20k 50 100 200 500 1k 2k 5k 10k hz p o =1.8w p o =1.2w p o =0.5w +0 +2 5 +2.5 +5 +7.5 +1 0 +1 2 .5 +1 5 +1 7 .5 +2 0 +2 2 .5 d b r a 20 20 k 50 100 200 500 1k 2k 5k 10 k hz g0=1 g1=1 g0=0 g1=1 g0=1 g1=0 g0=0 g1=0 -100 +0 -9 0 -8 0 -7 0 -6 0 -5 0 -4 0 -3 0 -2 0 -1 0 d b 20 20 k 50 100 200 500 1k 2k 5k 10k hz l r -100 -5 0 -9 5 -9 0 -8 5 -8 0 -7 5 -7 0 -6 5 -6 0 -5 5 d b 20 20 k 50 100 200 500 1k 2k 5k 10k hz -130 -50 -120 -11 0 -100 -90 -80 -70 -60 d b r a 20 20k 50 100 200 500 1 k 2 k 5k 10k hz 03/2009 rev 1.1
12 , power analog microelectronics inc www.poweranalog.com typical operating characteristics (t =25c) a output power vs supply voltage c =1 f, r =8 , gain=23db, f=1khz in l ? output power vs supply voltage c =1 f, r =4 , gain=23db, f=1khz in l ? quiescent current vs supply voltage no input, r =no load l frequency vs supply voltage input ac-ground pam8404 3w/ch filterless stereo class-d audio amplifier 1 % 10 % 1 % 10 % wcps 2x2-16 0 2 4 6 8 10 12 14 16 2 2.5 3 3.5 4 4.5 5 5.5 6 pow er supply voltage(v) quiescent current(ma) 284 288 292 296 300 304 2 2.5 3 3.5 4 4.5 5 5.5 6 pow er supply voltage(v) frequency(khz) 0 0.4 0.8 1.2 1.6 2 22.533.544.555.56 pow er supply voltage(v) output power(w) 0 0.5 1 1.5 2 2.5 3 2 2.5 3 3.5 4 4.5 5 5.5 6 pow er supply voltage(v) output power(w) 03/2009 rev 1.1
13 , power analog microelectronics inc www.poweranalog.com notes 1. the ap aux-0025 low pass filter is necessary for class-d amplifier measurement with ap analyzer. 2. two 22h inductors are used in series with load resistor to emulate the small speaker for efficiency measurement. test setup for performance testing ap system one generator pam8404 demo board +out input load ap low pass filter aux-0025 ap system one analyzer gnd -out vdd power supply pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
14 , power analog microelectronics inc www.poweranalog.com application information pam8404 3w/ch filterless stereo class-d audio amplifier gain settin table-1: input capacitors (ci ) decoupling capacitor (cs) howtoreduceemi figure 1: the gain of pam8404 can be selected as 6,12,18 or 24 db utilizing the g0 and g1 gain setting pins. the gains showed in the following table are realized by changing the input resistors inside the amplifier. the input impedance changes with the gain setting. gain setting for optimal performance the gain should be set to 2x (ri=150k ). lower gain allows the pam8404 to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. in addition to these features, lower value of gain minimizes pop noise. in the typical application, an input capacitor, ci, is required to allow the amplifier to bias the input signal to the proper dc level for optimum operation. in this case, ci and the input impedance ri form a high-pass filter with the corner frequency determined by the follow equation: it is important to consider the value of ci as it directly affects the low frequency performance of the circuit. when ri is 28.1 200hz, the equation is reconfigured as follows: when input resistance variation is considered, the ci is 28nf, so one would likely choose a value of 33nf. a further consideration for this capacitor is the leakage path from the input source through the input network (ci, ri + rf) to the load. this leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. for this reason, a low-leakage tantalum or ceramic capacitor is the best choice. when polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications as the dc level is held at v /2, which is likely higher than the source dc level. please note that it is important to confirm the capacitor polarity in the application. if the corner frequency is within the audio band, the capacitors should have a tolerance 10% or better, because any mismatch in capacitance cause an impedance mismatch at the corner frequency and below. the pam8404 is a high-performance cmos audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (thd) as low as possible. power supply decoupling also prevents the oscillations causing by long lead length between the amplifier and the speaker. the optimum decoupling is achieved by using two different types of capacitors that target on different types of noise on the power supply leads. for higher frequency transients, spikes, or digital hash on the line, a good low equivalent- series-resistan ifier is recommended. most applications require a ferrite bead filter for emi elimination as shown at figure 1. the ferrite filter reduces emi of around 1mhz and higher. when selecting a ferrite bead, choose one with high impedance at high frequencies and low impedance at low frequencies. ferrite bead filter to reduce emi k and the specification calls for a flat bass response are down to ce (esr) ceramic capacitor, typically 1f, is placed as close as possible to the device each vdd and pvdd pin for the best operation. for filtering lower frequency noise signals, a large ceramic capacitor of 10f or greater placed near the audio power ampl dd g1 g0 gain (v/v) gain (db) input impedance (k) 0 0 2 6 28.1 0 1 4 12 17.3 10 8 18 9.8 1 1 16 24 5.2 c 1 f 2rici ic 1 ci 2rf 220pf 220pf out+ out- ferrite bead ferrite bead 03/2009 rev 1.1
shutdown operation short circuit protection (scp) over temperature protection (otp) pop and click circuitry pcb layout guidelines grounding power supply line figure 2: components placement in order to reduce power consumption while not in use, the pam8404 contains shutdown circuitry to turn off the amplifier's bias circuitry. it features independent shutdown controls for each channel. this shutdown turns the amplifier off when logic low is placed on the pin. by switching the shutdown pin to gnd, the pam8404 supply current draw will be minimized in idle mode. the pam8404 has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorts or output-to-gnd shorts occur. when a short circuit occurs, the device immediately goes into shutdown state. once the short is removed, the device will be reactivated. thermal protection on the pam8404 prevents the device from damage when the internal die temperature exceeds 150c. there is a 15c tolerance on this trip point from device to device. once the die temperature exceeds the set point, the device will enter the shutdown state and the outputs are disabled. this is not a latched fault. the thermal fault is cleared once the temperature of the die decreased by 50c. this large hysteresis will prevent motor boating sound well and the device begins normal operation at this point with no external system interaction. the pam8404 contains circuitry to minimize turn- on and turn-off transients or click and pops, where turn-on refers to either power supply turn- on or device recover from shutdown mode. when the device is turned on, the amplifiers are internally muted. an internal current source ramps up the internal reference voltage. the device will remain in mute mode until the reference voltage reach half supply voltage /2. as soon as the reference voltage is stable, the device will begin full operation. for the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage. it is recommended to use plane grounding or separate grounds. do not use one line connecting power gnd and analog gnd. noise currents in the output power stage need to be returned to output noise ground and nowhere else. when these currents circulate elsewhere, they may get into the power supply, or the signal ground, etc, even worse, they may form a loop and radiate noise. any of these instances results in degraded amplifier performance. the output noise ground that the logical returns for the output noise currents associated with class d switching must tie to system ground at the power exclusively. signal currents for the inputs, reference need to be returned to quite ground. this ground only ties to the signal components and the gnd pin. gnd then ties to system ground. same a the ground, vdd and pvdd need to be separately connected to the system power supply. it is recommended that all the trace could be routed as short and thick as possible. for the power line layout, just imagine water stream, any barricade placed in the trace (shown in figure 2) could result in the bad performance of the amplifier. power line 404 on the pvdd terminal. input capacitors need to be placed very close to input pins. output filter - the ferrite emi filter should be placed as close to the output terminals as possible for the best emi performance, and the capacitors used in the filters should be grounded to system ground. sdx decoupling capacitors-as previously described, the high-frequency 1f decoupling capacitors should be placed as close to the power supply terminals (vdd and pvdd) as possible. large bulk power supply decoupling capacitors (10f or greater) should be placed near the pam8 v s dd 15 , power analog microelectronics inc www.poweranalog.com pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
ordering information 16 shipping package (r: tape & reel) number of pins (e: 16; g: 20) package type (z: wcsp; k: qfn4x4) pam8404 x x x part number marking package type shipping package PAM8404ZER fr yw wcsp 16 3,000 units/tape & reel pam8404kgr p8404 xxxyw qfn4x4 20l 3,000 units/tape & reel , power analog microelectronics inc www.poweranalog.com pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
17 , power analog microelectronics inc www.poweranalog.com 1.95 0.02 1.95 0.02 wcsp 2x2 units:millimeter 1.00 0.50 0.415 0.04 0.235 0.02 outline dimensions pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1
18 , power analog microelectronics inc www.poweranalog.com outline dimensions qfn4x4-20l pam8404 3w/ch filterless stereo class-d audio amplifier 03/2009 rev 1.1

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