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e u a 2012a ds2 012a ver 1.4 feb. 2011 1 2.5-w/ch stereo filter-less class-d audio power amplifier with auto-recovery description the eua2012a is a high efficiency, 2.5w/channel stereo class-d audio power amplifier. a low noise, filterless pwm architecture eliminates the output filter, requiring only two external components for operation. operating from a single 5v supply, eua2012a is capable of delivering 2.5w/ channel of continuous output power to a 4 load with 10% thd+n. the eua2012a features independent shutdown controls for each channel. the gain can be selected to 6, 12, 18, or 24 db utilizing the g0 and g1 gain select pins. high psrr and differential architecture provide increased immunity to noise and rf rectification. the eua2012a is available in space-saving wcsp, tqfn and tssop packages, is an idea choice for mobile phones and other portable communication devices. typical application circuit features low emi emission output power by tqfn package - 2.5w/ch into 4 at 5v - 1.6w/ch into 8 at 5v - 800mw/ch into 8 at 3.6v wide supply voltage: 2.5v to 5.5v independent shutdown control for each channel selectable gain of 6,12,18 and 24 db high psrr :63db at 217hz fast 34ms startup time low 5ma quiescent current at 3.6v supply and 1.5 a shutdown current short-circuit auto-recovery and thermal protection space saving packages - 4mm 4mm tqfn-20 package - 2mm 2mm wcsp-16 package - tssop-20 package rohs compliant and 100% lead(pb)-free, halogen-free applications wireless or cellular handsets and pdas portable audios notebook pc figure1. v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 2 pin configurations package type pin configurations package type pin configurations tqfn-20 wcsp-16 tssop-20 pin description pin tqfn-20 wcsp-16 tssop-20 i/o description inr+ 16 d1 18 i right channel positive input inr- 17 c1 19 i right channel negative input inl+ 20 a1 2 i left channel positive input inl- 19 b1 1 i left channel negative input sdr 8 b3 10 i right channel shutdown terminal (active low) sdl 7 b4 9 i left channel shutdown terminal (active low) g0 15 c2 17 i gain select (lsb) g1 1 b2 4 i gain select (msb) pvdd 3,13 a2 6,15 i power supply (must be same voltage as avdd) avdd 9 d2 11 i analog supply (must be same voltage as pvdd) pgnd 4,12 c4 7,14 i power ground agnd 18 c3 20 i analog ground outr+ 14 d3 16 o right channel positive differential output outr- 11 d4 13 o right channel negative differential output outl+ 2 a3 5 o left channel positive differential output outl- 5 a4 8 o left channel negative differential output nc 6,10 - 3,12 - no internal connection n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 3 ordering information order number package type mark ing operating temperature range eua2012ahir1 wcsp-16 xxx h0 -40 c to +85c eua2012ajir1 tqfn-20 xxxxx 2012a -40 c to +85c EUA2012AQIR1 tssop-20 xxxxx eua2012a -40 c to +85c eua2012a l ead free code 1: lead free, halogen-free 0: lead packing r: tape & reel operating temperature range i: industry standard package type j: tqfn h: wcsp q: tssop block diagram figure 2. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 4 absolute maximum ratings (1) supply voltage, avdd,pvdd ------------------------------------------------------------------------- -0.3 v to 6v input voltage, v i ---------------------------------------------------------------------------------- -0.3 v to v dd +0.3v junction temperature, t j ------------------------------------------------------------------------------ -40c to 150c storage temperature rang, t stg --------------------------------------------------------------------- -65c to 85c esd susceptibility ------------------------------------------------------------------------------------------ 2kv lead temperature 1,6 mm (1/16 inch) from case for 10 seconds --------------------------------------- 260c thermal resistance ja (tqfn-20) -------------------------------------------------------------------------------------------- 45c/w ja (wcsp-16) -------------------------------------------------------------------------------------------- 105c/w ja (tssop-20) ------------------------------------------------------------------------------------------ 92c/w recommended operating conditions (2) min max unit supply voltage, avdd,pvdd 2.5 5.5 v high-level input voltage, sdl , sdr ,g0,g1 1.3 v low-level input voltage, sdl , sdr ,g0,g1 0. 35 v operating free-air temperature, t a -40 85 c note (1): stress beyond those listed under absolute maximum ratings may damage the device. note (2): the device is not guaranteed to function outside the recommended operating conditions. electrical characteristics t a = +25c (unless otherwise noted) eua2012a symbol parameter conditions min typ max. unit oo v outp ut offset voltage (measured differentially) inputs ac grounded, a v= 6db, v dd =2.5v to 5.5v 5 25 mv psrr power supply rejection ratio v dd = 2.5v to 5.5v -75 -55 db v icm common-mode input voltage 0.5 vdd-0.8 v cmrr common-mode rejection ration input shorted together, v dd = 2.5v to 5.5v -69 -50 db ih i high -level input current v dd = 5v, v i = v dd 50 a il i low-level input current v dd = 5v, v i = 0v 5 a v dd = 5v, no load or output filter 6.2 12 v dd = 3.6v, no load or output filter 5.2 7.5 v dd = 2.5v, no load or output filter 4.5 6 ma i dd supply current shut down mode 1.5 a v dd = 5v 400 v dd = 3.6v 450 r ds(on) stat ic drain-source on-state resistance v dd = 2.5v 550 m output impedance in shutdown mode v ( ) sdl,sdr =0.35v 2 k f (sw) switching frequency v dd = 2.5v to 5.5v 250 300 350 khz n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 5 electrical characteristics t a = +25c, r l =8 (unless otherwise noted) eua2012a symbol parameter conditions min typ max. unit g0,g1=0.35v 5.3 6 6.5 g0=v dd , g1=0.35v 11.2 1 2 12.5 g0=0.35v,g1= v dd 17.2 1 8 18.5 closed-loop voltage gain g0,g1= v dd 23 24 24.5 db v dd = 5v,f=1khz,thd=10% 1.6 rl=8 v dd = 3.6v,f=1khz,thd=10% 0.8 p o outp ut power (per channel) rl=4 v dd = 5v, ,f=1khz,thd=10% 2.5 w p o =1w,v dd = 5v,a v =6db,f=1khz 0.13 thd+n total harmonic distortion plus noise p o =0.5w,v dd = 5v,a v =6db,f=1khz 0.11 % channel crosstalk f=1khz -82 db v dd = 5v,a v =6db,f=217 hz -62 k svr supp ly ripple rejection ratio v dd = 3.6v,a v =6db,f=217 hz -63 db cmrr common mode rejection ratio v dd = 3.6v,v ic =1v pp ,f=217 hz -60 db a v =6db 30. 8 a v =12db 18. 6 a v =18db 12. 4 input impedance a v =24db 6.3 k start-up time from shutdown v dd = 3.6v 34 ms no weighting 56 output voltage noise v dd = 3.6v,f=20 to 20k h z,inputs are ac grounded, a v =6db a w e ighting 39 v n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 6 typical operating characteristics figure3. figu r e5. figure7. figure4. figur e6. figu r e8. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 7 figure9. figure11. figure13. figure10. figure12. figure14. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 8 figure15. figure17. figure19. figure16. figure18. figure20. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 9 figure21. figure23. figure25. figure22. figure24. figure26. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 10 figure27. figu r e29. figure31. fi g ure28. figure30. n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 11 application information decoupling capacitor (c s ) the eua2012a is a high-performance class-d audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (thd) is low. for higher frequency transients, spikes, or digital hash on the line a good low equivalent-series-resistance (esr) ceramic capacitor, typically 1 f, placed as close as possible to the device pv dd lead works best. placing this decoupling capacitor close to the eua2012a is important for the efficiency of the class-d amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. for filtering lower-frequency noise signals, a 4.7 f or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high psrr of this device. table 1. gain setting g1 g0 gain (v/v) gain (db) input impedance (r i )(k ) 0 0 2 6 30.8 0 1 4 12 18.6 1 0 8 18 12.4 1 1 16 24 6.3 input capacitors (c i ) the eua2012a does not require input coupling capacitors if the design uses a differential source that is biased from 0.5 v to v dd C 0.8 v. if the input signal is not bia se d within the recommended common ?mode input range, if high pass filter (shown in figure 32), or if using a single-ended source (shown in figure 33), input coupling capacitors are required. the input capacitors and input resistors form a high-pass filter with the corner frequency, fc, determined in equation (1). --------------------------------------------(1) the value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. speakers in wireless phones cannot usually respond well to low frequencies, so the corner frequency can be set to block low frequencies in this application. not using input capacitors can increase output offset. equation (2) is used to solve for the input coupling capacitance. --------------------------------------------(2) if the corner frequency is within the audio band, the capacitors should have a tolerance of 10% or better, because any mismatch in capacitance causes an impedance mismatch at the corner frequency and below. component location place all the external components very close to the eua2012a. placing the decoupling capacitor, cs, close to the eua2012a is important for the efficiency of the class-d amplifier. any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. filter free operation and ferrite bead filters a ferrite bead filter can often be used if the design is failing radiated emissions without an lc filter and the frequency sensitive circuit is greater than 1 mhz. this filter functions well for circuits that just have to pass fcc and ce because fcc and ce only test radiated emissions greater than 30 mhz. when choosing a ferrite bead, choose one with high impedance at high frequencies, and very low impedance at low frequencies. in addition, select a ferrite bead with adequate current rating to prevent distortion of the output signal. use an lc output filter if there are low frequency (< 1 mhz) emi sensitive circuits and/or there are long leads from amplifier to speaker. figure 34 shows typical ferrite bead and lc output filters. figure34. typical ferrite chip bead filter sho r t circuit auto-recovery when a short circuit event happens, the eua2012a goes to shutdown mode and tries to reactivate itself after 4ms. this auto-recovery will continue until the short circuit events is removed. ( ) i c i r2 1 c f p = ( ) c f i r2 1 i c p = n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 12 figu r e32. application schematic with differential input and input capacitors figure33. application schematic with single-ended input n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 13 packaging information tqfn -20 mill imeters inches symbols min. max. min. max. a 0.70 0.80 0.028 0.031 b 0.18 0.30 0.007 0.012 e 3.90 4.10 0.154 0.161 d 3.90 4.10 0.154 0.161 d1 2.70 0.106 e1 2.70 0.106 e 0.50 0.020 l 0.30 0.50 0.012 0.020 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 14 wcsp-16 millimeters inc h es symbols min. max. min. max. a - 0.675 - 0.027 a1 0.15 0.35 0.006 0.014 d 2.01 2.11 0.079 0.083 d1 0.50 0.020 e 2.01 2.11 0.079 0.083 e1 0.50 0.020 4 a d e d1 e1 a a1 3 2 1 b c d n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com
eua2012a ds2012a ver 1.4 feb. 2011 15 tssop-20 millimeters inc h es symbols min. max. min. max. a - 1.20 - 0.047 a1 0.00 0.15 0.000 0.006 b 0.19 0.30 0.007 0.012 e1 4.40 0.173 d 6.50 0.256 e 6.20 6.60 0.244 0.260 e 0.65 0.026 l 0.45 0.75 0.018 0.030 n~n?t?m?w3^v?mw`r?y?b?g ?pqls? tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com v?mw`r?y?b? www.gofotech.com

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