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this is information on a product in full production. march 2014 docid026037 rev 1 1/37 a21sp16 3 w filter-free class-d audio power amplifier datasheet - production data features ? operating from v cc = 2.4 v to 5.5 v ? standby mode active low ? output power: 3 w into 4 ? and 1.75 w into 8 ?? with 10% thd+n max and 5 v power supply ? output power: 2.3 w @ 5 v or 0.75 w @ 3 v into 4 ?? with 1% thd+n max ? output power: 1.4 w @ 5 v or 0.45 w @ 3 v into 8 ?? with 1% thd+n max ? adjustable gain via external resistors ? low current consumption 2 ma @ 3 v ? efficiency: 88% typ. ? signal to noise ratio: 85 db typ. ? psrr: 63 db typ. @ 217 hz with 6 db gain ? pwm base frequency: 250 khz ? low pop & click noise ? thermal shutdown protection ? available in flip-chip 9 x 300 ? m (pb-free) applications ? wearable ? fitness and healthcare ? cellular phone ? pda description the a21sp16 is a differential class-d btl power amplifier. it is able to dr ive up to 2.3 w into a 4 ? load and 1.4 w into a 8 ? load at 5 v. it achieves outstanding efficiency (88% typ.) compared to classical class-ab audio amps. the gain of the device c an be controlled via two external gain-setting resistors. pop & click reduction circuitry provid es low on/off switch noise while allowing the device to start within 5 ms. a standby function (active low) allows the reduction of current cons umption to 10 na typ. v dd 1/a1 7/c1 8/c2 9/c3 4/b1 6/b3 2/a2 3/a3 5/b2 v dd in - in + gnd stby gnd out + out - v dd 1/a1 7/c1 8/c2 9/c3 4/b1 6/b3 2/a2 3/a3 5/b2 v dd in - in + gnd stby gnd out + out - pin connection in+: positive differential input in-: negative differential input vdd: analog power supply gnd: power supply ground stby: standby pin (active low) out+: positive differential output out-: negative differential output in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k block diagram table 1. order codes part number temperature range package packing marking a21sp16 -40 c to +85 c lead-free flip-chip tape & reel 62 www.st.com
contents a21sp16 2/37 docid026037 rev 1 contents 1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 application component informati on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.1 differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.2 gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.3 common mode feedback loop limi tations . . . . . . . . . . . . . . . . . . . . . . . . 28 for example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.4 low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.5 decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.6 wake-up time (t wu ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.7 shutdown time (t stby ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.8 consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.9 single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 5.10 output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 5.11 different examples with su mmed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 32 example 1: dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 example 2: one differential input plus one sing le-ended input . . . . . . . . . . . . . . . 33 6 footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
docid026037 rev 1 3/37 a21sp16 absolute maximum ratings 37 1 absolute maximum ratings table 2. absolute maximum ratings symbol parameter value unit v cc supply voltage (1), (2) 1. caution: this device is not protected in the event of abnormal operating conditions, such as for example, short-circuiting between any one output pi n and ground, between any one output pin and v cc , and between individual output pins. 2. all voltage values are measured with respect to the ground pin. 6v v in input voltage (3) 3. the magnitude of the input signal must never exceed v cc + 0.3v / gnd - 0.3v. gnd to v cc v t oper operating free-air temperature range -40 to + 85 c t stg storage temperature -65 to +150 c t j maximum junction temperature 150 c r thja thermal resistance junction to ambient (4) 4. the device is protected in case of over te mperature by a thermal shutdown active @ 150c. 200 c/w p diss power dissipation internally limited (5) 5. exceeding the power derating curves dur ing a long period causes abnormal operation. esd human body model 2 kv esd machine model 200 v latch-up latch-up immunity 200 ma v stby standby pin voltage maximum voltage (6) 6. the magnitude of the standby signal must never exceed v cc + 0.3v / gnd - 0.3v. gnd to v cc v lead temperature (soldering, 10 sec) 260 c table 3. operating conditions symbol parame ter value unit v cc supply voltage (1) 1. for v cc from 2.4v to 2.5v, the operating temperature range is reduced to 0c ? t amb ? 70c. 2.4 to 5.5 v v ic common mode input voltage range (2) 2. for v cc from 2.4v to 2.5v, the common mode input range must be set at v cc /2. 0.5 to v cc - 0.8 v v stby standby voltage input: (3) device on device off 3. without any signal on v stby , the device will be in standby. 1.4 ? v stby ?? v cc gnd ? v stby ? 0.4 (4) 4. minimum current consumption is obtained when v stby = gnd. v r l load resistor ? 4 ? r thja thermal resistance junction to ambient (5) 5. with heat sink surface = 125mm 2 . 90 c/w
application component information a21sp16 4/37 docid026037 rev 1 2 application component information figure 1. typical application schematics table 4. component information component functional description c s bypass supply capacitor. install as close as possible to the a21sp16 to minimize high-frequency ripple. a 100nf ceramic capacitor should be added to enhance the power suppl y filtering at high frequency. r in input resistor to program the a21sp16 differential gain (gain = 300 k ? /r in with r in in k ? ). input capacitor due to common mode feedback, these input capacitors are optional. however, they can be added to form with r in a 1st order high pass filter with -3db cut-off frequency = 1/(2* ? *r in *c in ). rin rin cs 1u gnd gnd gnd vcc vcc speaker in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k ts4962 capacitors input are optional + - differential input in+ gnd in- gnd rin rin cs 1u gnd gnd gnd vcc vcc + - differential input capacitors input are optional in+ gnd in- gnd 2f 15h 15h load 4 ohms lc output filter 8 ohms lc output filter 2f gnd 1f 30h 30h 1f gnd in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k ts4962
docid026037 rev 1 5/37 a21sp16 electrical characteristics 37 3 electrical characteristics table 5. v cc = +5v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) symbol parameter conditions min. typ. max. unit i cc supply current no input signal, no load 2.3 3.3 ma i stby standby current (1) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l =8 ? 325mv p out output power g=6db thd = 1% max, f = 1khz, r l =4 ? thd = 10% max, f = 1khz, r l =4 ? thd = 1% max, f = 1khz, r l =8 ? thd = 10% max, f = 1khz, r l =8 ? 2.3 3 1.4 1.75 w thd + n total harmonic distortion + noise p out =900mw rms , g = 6db, 20hz < f < 20khz r l = 8w + 15h, bw < 30khz p out =1w rms , g = 6db, f = 1khz, r l = 8w + 15h, bw < 30khz 1 0.4 % efficiency efficiency p out =2w rms , r l =4 ? + ? 15h p out =1.2w rms , r l =8 ? + ? 15h 78 88 % psrr power supply rejection ratio with inputs grounded (2) f = 217hz, r l =8 ??? g=6db ? v ripple = 200mv pp 63 db cmrr common mode rejection ratio f = 217hz, r l =8 ??? g = 6db, ? v icm =200mv pp 57 db gain gain value r in in k ? v/v r stby internal resistance from standby to gnd 273 300 327 k ? f pwm pulse width modulator base frequency 180 250 320 khz snr signal to noise ratio a-weighting, p out =1.2w, r l =8 ? 85 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k ? r in ------------------ 300k ? r in ------------------ 327k ? r in ------------------
electrical characteristics a21sp16 6/37 docid026037 rev 1 v n output voltage noise f = 20hz to 20khz, g = 6db unweighted r l =4 ? a-weighted r l =4 ? 85 60 ? v rms unweighted r l =8 ? a-weighted r l =8 ? 86 62 unweighted r l =4 ? + 15h a-weighted r l =4 ? + 15h 83 60 unweighted r l =4 ? + 30h a-weighted r l =4 ? + 30h 88 64 unweighted r l =8 ? + 30h a-weighted r l =8 ? + 30h 78 57 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 87 65 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 82 59 1. standby mode is active when v stby is tied to gnd. 2. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc @ f = 217hz. table 5. v cc = +5v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (continued) symbol parameter conditions min. typ. max. unit
docid026037 rev 1 7/37 a21sp16 electrical characteristics 37 table 6. v cc = +4.2v, gnd = 0v, v ic =2.5v, t amb = 25c (unless otherwise specified) (1) symbol parameter conditions min. typ. max. unit i cc supply current no input signal, no load 2.1 3 ma i stby standby current (2) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l =8 ? 325mv p out output power g=6db thd = 1% max, f = 1khz, r l =4 ? thd = 10% max, f = 1khz, r l =4 ? thd = 1% max, f = 1khz, r l =8 ? thd = 10% max, f = 1khz, r l =8 ? 1.6 2 0.95 1.2 w thd + n total harmonic distortion + noise p out =600mw rms , g = 6db, 20hz < f < 20khz r l =8 ? + 15h, bw < 30khz p out =700mw rms , g = 6db, f = 1khz, r l =8 ? + 15h, bw < 30khz 1 0.35 % efficiency efficiency p out =1.45w rms , r l =4 ? + ? 15h p out =0.9w rms , r l =8 ? + ? 15h 78 88 % psrr power supply rejection ratio with inputs grounded (3) f = 217hz, r l =8 ??? g=6db ? v ripple =200mv pp 63 db cmrr common mode rejection ratio f = 217hz, r l =8 ??? g=6db, ? v icm = 200mv pp 57 db gain gain value r in in k ? v/v r stby internal resistance from standby to gnd 273 300 327 k ? f pwm pulse width modulator base frequency 180 250 320 khz snr signal to noise ratio a-weighting, p out = 0.9w, r l =8 ? 85 db t wu wake-uptime 5 10 ms t stby standby time 5 10 ms 273k ? r in ------------------ 300k ? r in ------------------ 327k ? r in ------------------
electrical characteristics a21sp16 8/37 docid026037 rev 1 v n output voltage noise f = 20hz to 20khz, g = 6db unweighted r l =4 ? a-weighted r l =4 ? 85 60 ? v rms unweighted r l =8 ? a-weighted r l =8 ? 86 62 unweighted r l =4 ? + 15h a-weighted r l =4 ? + 15h 83 60 unweighted r l =4 ? + 30h a-weighted r l =4 ? + 30h 88 64 unweighted r l =8 ? + 30h a-weighted r l =8 ? + 30h 78 57 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 87 65 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 82 59 1. all electrical values are guaranteed with correlation measurements at 2.5 v and 5 v. 2. standby mode is active when v stby is tied to gnd. 3. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc @ f = 217hz. table 6. v cc = +4.2v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (1) (continued) symbol parameter conditions min. typ. max. unit
docid026037 rev 1 9/37 a21sp16 electrical characteristics 37 table 7. v cc = +3.6v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (1) symbol parameter conditions min. typ. max. unit i cc supply current no input signal, no load 2 2.8 ma i stby standby current (2) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l =8 ? 325mv p out output power g=6db thd = 1% max, f = 1khz, r l =4 ? thd = 10% max, f = 1khz, r l =4 ? thd = 1% max, f = 1khz, r l =8 ? thd = 10% max, f = 1khz, r l =8 ? 1.15 1.51 0.7 0.9 w thd + n total harmonic distortion + noise p out =500mw rms , g = 6db, 20hz < f< 20khz r l =8 ? + 15h, bw < 30khz p out =500mw rms , g = 6db, f = 1khz, r l =8 ? + 15h, bw < 30khz 1 0.27 % efficiency efficiency p out =1w rms , r l =4 ?????? 15h p out =0.65w rms , r l =8 ????? 15h 78 88 % psrr power supply rejection ratio with inputs grounded (3) f = 217hz, r l =8 ??? g=6db ? v ripple = 200mv pp 62 db cmrr common mode rejection ratio f = 217hz, r l =8 ??? g = 6db, ? v icm =200mv pp 56 db gain gain value r in in k ? v/v r stby internal resistance from standby to gnd 273 300 327 k ? f pwm pulse width modulator base frequency 180 250 320 khz snr signal to noise ratio a-weighting, p out =0.6w, r l =8 ? 83 db t wu wake-uptime 5 10 ms t stby standby time 5 10 ms 273k ? r in ------------------ 300k ? r in ------------------ 327k ? r in ------------------
electrical characteristics a21sp16 10/37 docid026037 rev 1 v n output voltage noise f = 20hz to 20khz, g = 6db unweighted r l =4 ? a-weighted r l =4 ? 83 57 ? v rms unweighted r l =8 ? a-weighted r l =8 ? 83 61 unweighted r l =4 ? + 15h a-weighted r l =4 ?? + 15h 81 58 unweighted r l =4 ?? + 30h a-weighted r l =4 ? + 30h 87 62 unweighted r l =8 ? + 30h a-weighted r l =8 ?? + 30h 77 56 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 85 63 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 80 57 1. all electrical values are guaranteed with correlation measurements at 2.5v and 5v. 2. standby mode is active when v stby is tied to gnd. 3. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed si nusoidal signal to v cc @ f = 217hz. table 7. v cc = +3.6v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (1) (continued) symbol parameter conditions min. typ. max. unit
docid026037 rev 1 11/37 a21sp16 electrical characteristics 37 table 8. v cc = +3v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (1) symbol parameter conditions min. typ. max. unit i cc supply current no input signal, no load 1.9 2.7 ma i stby standby current (2) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l =8 ? 325mv p out output power g=6db thd = 1% max, f = 1khz, r l =4 ? thd = 10% max, f = 1khz, r l =4 ? thd = 1% max, f = 1khz, r l =8 ? thd = 10% max, f = 1khz, r l =8 ? 0.75 1 0.5 0.6 w thd + n total harmonic distortion + noise p out = 350mw rms , g = 6db, 20hz < f < 20khz r l =8 ? + 15h, bw < 30khz p out = 350mw rms , g = 6db, f = 1khz, r l =8 ? + 15h, bw < 30khz 1 0.21 % efficiency efficiency p out =0.7w rms , r l =4 ? + ? 15h p out =0.45w rms , r l =8 ? + ? 15h 78 88 % psrr power supply rejection ratio with inputs grounded (3) f = 217hz, r l =8 ??? g=6db ? v ripple = 200mv pp 60 db cmrr common mode rejection ratio f = 217hz, r l =8 ??? g=6db, ? v icm = 200mv pp 54 db gain gain value r in in k ? v/v r stby internal resistance from standby to gnd 273 300 327 k ? f pwm pulse width modulator base frequency 180 250 320 khz snr signal to noise ratio a-weighting, p out =0.4w, r l =8 ? 82 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k ? r in ------------------ 300k ? r in ------------------ 327k ? r in ------------------
electrical characteristics a21sp16 12/37 docid026037 rev 1 v n output voltage noise f = 20hz to 20khz, g = 6db unweighted r l =4 ? a-weighted r l =4 ? 83 57 ? v rms unweighted r l =8 ? a-weighted r l =8 ? 83 61 unweighted r l =4 ? + 15h a-weighted r l =4 ? + 15h 81 58 unweighted r l =4 ? + 30h a-weighted r l =4 ? + 30h 87 62 unweighted r l =8 ? + 30h a-weighted r l =8 ? + 30h 77 56 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 85 63 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 80 57 1. all electrical values are guaranteed with correlation measurements at 2.5 v and 5 v. 2. standby mode is active when v stby is tied to gnd. 3. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed si nusoidal signal to v cc @ f = 217hz. table 8. v cc = +3v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (1) (continued) symbol parameter conditions min. typ. max. unit
docid026037 rev 1 13/37 a21sp16 electrical characteristics 37 table 9. v cc = +2.5v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) symbol parameter conditions min. typ. max. unit i cc supply current no input signal, no load 1.7 2.4 ma i stby standby current (1) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l =8 ? 325mv p out output power g=6db thd = 1% max, f = 1khz, r l =4 ? thd = 10% max, f = 1khz, r l =4 ? thd = 1% max, f = 1khz, r l =8 ? thd = 10% max, f = 1khz, r l =8 ? 0.52 0.71 0.33 0.42 w thd + n total harmonic distortion + noise p out =200mw rms , g = 6db, 20hz < f< 20khz r l =8 ? + 15h, bw < 30khz p out = 200w rms , g = 6db, f = 1khz, r l =8 ? + 15h, bw < 30khz 1 0.19 % efficiency efficiency p out = 0.47w rms , r l =4 ? + ? 15h p out =0.3w rms , r l =8 ? + ? 15h 78 88 % psrr power supply rejection ratio with inputs grounded (2) f = 217hz, r l =8 ??? g=6db ? v ripple = 200mv pp 60 db cmrr common mode rejection ratio f = 217hz, r l =8 ??? g = 6db, ? v icm =200mv pp 54 db gain gain value r in in k ? v/v r stby internal resistance from standby to gnd 273 300 327 k ? f pwm pulse width modulator base frequency 180 250 320 khz snr signal to noise ratio a-weighting, p out =1.2w, r l =8 ? 80 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k ? r in ------------------ 300k ? r in ------------------ 327k ? r in ------------------
electrical characteristics a21sp16 14/37 docid026037 rev 1 v n output voltage noise f = 20hz to 20khz, g = 6db unweighted r l =4 ? a-weighted r l =4 ? 85 60 ? v rms unweighted r l =8 ? a-weighted r l =8 ? 86 62 unweighted r l =4 ? + 15h a-weighted r l =4 ? + 15h 76 56 unweighted r l =4 ? + 30h a-weighted r l =4 ? + 30h 82 60 unweighted r l =8 ? + 30h a-weighted r l =8 ? + 30h 67 53 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 78 57 unweighted r l =4 ? + filter a-weighted r l =4 ? + filter 74 54 1. standby mode is active when v stby is tied to gnd. 2. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed si nusoidal signal to v cc @ f = 217hz. table 9. v cc = +2.5v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) (continued) symbol parameter conditions min. typ. max. unit
docid026037 rev 1 15/37 a21sp16 electrical characteristics 37 table 10. v cc = +2.4v, gnd = 0v, v ic = 2.5v, t amb = 25c (unless otherwise specified) symbol parameter conditions min. typ. max. unit i cc supply current no input signal, no load 1.7 ma i stby standby current (1) no input signal, v stby = gnd 10 na v oo output offset voltage no input signal, r l =8 ? 3mv p out output power g=6db thd = 1% max, f = 1khz, r l =4 ? thd = 10% max, f = 1khz, r l =4 ? thd = 1% max, f = 1khz, r l =8 ? thd = 10% max, f = 1khz, r l =8 ? 0.48 0.65 0.3 0.38 w thd + n total harmonic distortion + noise p out =200mw rms , g = 6db, 20hz < f< 20khz r l =8 ? + 15h, bw < 30khz 1 % efficiency efficiency p out = 0.38w rms , r l =4 ? + ? 15h p out = 0.25w rms , r l =8 ?? + ? 15h 77 86 % cmrr common mode rejection ratio f = 217hz, r l =8 ? , g = 6db, dv icm = 200mv pp 54 db gain gain value r in in k ? v/v r stby internal resistance from standby to gnd 273 300 327 k ? f pwm pulse width modulator base frequency 250 khz snr signal to noise ratio a weighting, p out = 1.2w, r l =8 ? 80 db t wu wake-up time 5 ms t stby standby time 5 ms v n output voltage noise f = 20hz to 20khz, g = 6db unweighted r l =4 ? a-weighted r l =4 ? 85 60 ? v rms unweighted r l =8 ? a-weighted r l =8 ? 86 62 unweighted r l =4 ?? + 15h a-weighted r l =4 ?? + 15h 76 56 unweighted r l =4 ?? + 30h a-weighted r l =4 ?? + 30h 82 60 unweighted r l =8 ?? + 30h a-weighted r l =8 ? + 30h 67 53 unweighted r l =4 ?? + filter a-weighted r l =4 ?? + filter 78 57 unweighted r l =4 ?? + filter a-weighted r l =4 ?? + filter 74 54 1. standby mode is active when v stby is tied to gnd. 273k ? r in ------------------ 300k ? r in ------------------ 327k ? r in ------------------
electrical characteristic curves a21sp16 16/37 docid026037 rev 1 4 electrical characteristic curves the graphs included in this sect ion use the following abbreviations: ? r l + 15 ? h or 30 ? h = pure resistor + very low series resistance inductor ? filter = lc output filter (1 f + 30 h for 4 ? and 0.5 f + 60 h for 8 ? ) ? all measurements done with c s1 = 1f and c s2 = 100 nf except for psrr where cs1 is removed. figure 2. test diagram for measurements figure 3. test diagram for psrr measurements in+ in- rin 150k rin 150k cin cin gnd vcc + cs1 1uf gnd cs2 100nf gnd rl 4 or 8 ohms 15uh or 30uh or lc filter 5th order 50khz low pass filter audio measurement bandwidth < 30khz out+ out- ts4962 in+ in- rin 150k rin 150k 4.7uf 4.7uf gnd cs2 100nf gnd rl 4 or 8 ohms 15uh or 30uh or lc filter 5th order 50khz low pass filter rms selective measurement bandwidth=1% of fmeas out+ out- ts4962 gnd 5th order 50khz low pass filter reference 20hz to 20khz vcc gnd
docid026037 rev 1 17/37 a21sp16 electrical characteristic curves 37 figure 4. current consumption vs. power supply voltage figure 5. current consumption vs. standby voltage 012345 0.0 0.5 1.0 1.5 2.0 2.5 no load tamb=25 c current consumption (ma) power supply voltage (v) 012345 0.0 0.5 1.0 1.5 2.0 2.5 vcc = 5v no load tamb=25 c current consumption (ma) standby voltage (v) figure 6. current consumption vs. standby voltage figure 7. output offset voltage vs. common mode input voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 vcc = 3v no load tamb=25 c current consumption (ma) standby voltage (v) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 5 10 15 20 vcc=3.3v vcc=2.5v vcc=5v g = 6db tamb = 25 c voo (mv) common mode input voltage (v) figure 8. efficiency vs. output power fi gure 9. efficiency vs. output power 0.0 0.5 1.0 1.5 2.0 0 20 40 60 80 100 0 100 200 300 400 500 600 vcc=5v rl=4 + 15 h f=1khz thd+n 2% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 20 40 60 80 100 0 50 100 150 200 vcc=3v rl=4 + 15 h f=1khz thd+n 2% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw)
electrical characteristic curves a21sp16 18/37 docid026037 rev 1 figure 10. efficiency vs. output power figure 11. efficiency vs. output power 0.0 0.2 0.4 0.6 0.8 1.0 0 20 40 60 80 100 0 50 100 150 vcc=5v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) 0.0 0.1 0.2 0.3 0.4 0.5 0 20 40 60 80 100 0 25 50 75 vcc=3v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) figure 12. output power vs. power supply voltage figure 13. output power vs. power supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 thd+n=10% rl = 4 + 15 h f = 1khz bw < 30khz tamb = 25 c thd+n=2% output power (w) vcc (v) 2.5 3.0 3.5 4.0 4.5 5.0 0.0 0.5 1.0 1.5 2.0 thd+n=10% rl = 8 + 15 h f = 1khz bw < 30khz tamb = 25 c thd+n=1% output power (w) vcc (v) figure 14. psrr vs. frequency figure 15. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3v 20k 20 vcc=5v vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 4 + 15 h tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3v 20k 20 vcc=5v vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 4 + 30 h tamb = 25 c psrr (db) frequency (hz)
docid026037 rev 1 19/37 a21sp16 electrical characteristic curves 37 figure 16. psrr vs. frequency figure 17. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3v 20k 20 vcc=5v vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 4 + filter tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3v 20k 20 vcc=5v vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 8 + 15 h tamb = 25 c psrr (db) frequency (hz) figure 18. psrr vs. frequency figure 19. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3v 20k 20 vcc=5v vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 8 + 30 h tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3v 20k 20 vcc=5v vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 8 + filter tamb = 25 c psrr (db) frequency (hz) figure 20. psrr vs. common mode input voltage figure 21. cmrr vs. frequency 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3.3v vcc=2.5v vcc=5v vripple = 200mvpp f = 217hz, g = 6db rl 4 + 15 h tamb = 25 c psrr(db) common mode input voltage (v) 100 1000 10000 -60 -40 -20 0 vcc=5v, 3v rl=4 + 15 h g=6db vicm=500mvpp cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz)
electrical characteristic curves a21sp16 20/37 docid026037 rev 1 figure 22. cmrr vs. frequency figure 23. cmrr vs. frequency 100 1000 10000 -60 -40 -20 0 vcc=5v, 3v rl=4 + 30 h g=6db vicm=500mvpp cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) 100 1000 10000 -60 -40 -20 0 vcc=5v, 3v rl=4 + filter g=6db vicm=500mvpp cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) figure 24. cmrr vs. frequency figure 25. cmrr vs. frequency 100 1000 10000 -60 -40 -20 0 vcc=5v, 3v rl=8 + 15 h g=6db vicm=500mvpp cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) 100 1000 10000 -60 -40 -20 0 vcc=5v, 3v rl=8 + 30 h g=6db vicm=500mvpp cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) figure 26. cmrr vs. frequency figure 27. cmrr vs. common mode input voltage 100 1000 10000 -60 -40 -20 0 vcc=5v, 3v rl=8 + filter g=6db vicm=500mvpp cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -70 -60 -50 -40 -30 -20 vcc=3.3v vcc=2.5v vcc=5v vicm = 200mvpp f = 217hz g = 6db rl 4 + 15 h tamb = 25 c cmrr(db) common mode input voltage (v)
docid026037 rev 1 21/37 a21sp16 electrical characteristic curves 37 figure 28. thd+n vs. output power figure 29. thd+n vs. output power 1e-3 0.01 0.1 1 0.1 1 10 vcc=4v vcc=2.5v rl = 4 + 15 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=4v vcc=2.5v rl = 4 + 30 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 30. thd+n vs. output power figure 31. thd+n vs. output power 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=2.5v vcc=3.3v rl = 8 + 15 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=2.5v vcc=3.3v rl = 8 + filter f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 32. thd+n vs. output power figure 33. thd+n vs. output power 1e-3 0.01 0.1 1 0.1 1 10 vcc=4v vcc=2.5v rl = 4 + 15 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=4v vcc=2.5v rl = 4 + 30 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w)
electrical characteristic curves a21sp16 22/37 docid026037 rev 1 figure 34. thd+n vs. output power figure 35. thd+n vs. output power 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=2.5v vcc=3.3v rl = 8 + 15 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=2.5v vcc=3.3v rl = 8 + filter f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 36. thd+n vs. frequency figure 37. thd+n vs. frequency 1000 10000 0.1 1 10 po=0.45w po=0.9w rl=8 + 15 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) 1000 10000 0.1 1 10 po=0.45w po=0.9w rl=8 + filter g=6db bw < 30khz vcc=5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) figure 38. thd+n vs. frequency figure 39. thd+n vs. frequency 1000 10000 0.1 1 10 po=0.35w po=0.7w rl=4 + 15 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 200 thd + n (%) frequency (hz) 1000 10000 0.1 1 10 po=0.35w po=0.7w rl=4 + 30 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 200 thd + n (%) frequency (hz)
docid026037 rev 1 23/37 a21sp16 electrical characteristic curves 37 figure 40. thd+n vs. frequency figure 41. thd+n vs. frequency 1000 10000 0.01 0.1 1 10 po=0.1w po=0.3w rl=4 + 15 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) 1000 10000 0.01 0.1 1 10 po=0.1w po=0.3w rl=4 + filter g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) figure 42. thd+n vs. frequency figure 43. thd+n vs. frequency 1000 10000 0.1 1 10 po=0.45w po=0.9w rl=8 + 15 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) 0.0 0.2 0.4 0.6 0.8 1.0 0 20 40 60 80 100 0 50 100 150 vcc=5v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) figure 44. thd+n vs. frequency figure 45. thd+n vs. frequency 1000 10000 0.01 0.1 1 10 po=0.25w po=0.5w rl=8 + 15 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 200 thd + n (%) frequency (hz) 1000 10000 0.01 0.1 1 10 po=0.25w po=0.5w rl=8 + 30 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 200 thd + n (%) frequency (hz)
electrical characteristic curves a21sp16 24/37 docid026037 rev 1 figure 46. thd+n vs. frequency figure 47. thd+n vs. frequency 1000 10000 0.01 0.1 1 10 po=0.1w po=0.2w rl=8 + 15 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) 1000 10000 0.01 0.1 1 10 po=0.1w po=0.2w rl=8 + filter g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 200 thd + n (%) frequency (hz) figure 48. gain vs. frequency f igure 49. gain vs. frequency 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=4 + 15 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=4 + 30 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) figure 50. gain vs. frequency f igure 51. gain vs. frequency 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=4 + filter g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=8 + 15 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz)
docid026037 rev 1 25/37 a21sp16 electrical characteristic curves 37 figure 52. gain vs. frequency f igure 53. gain vs. frequency 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=8 + 30 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=8 + filter g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) figure 54. gain vs. frequency figure 55. startup & shutdown time v cc =5 v, g=6 db, c in = 1 f (5 ms/div) 100 1000 10000 0 2 4 6 8 vcc=5v, 3v rl=no load g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) vo1 vo2 vo1 -vo2 standby figure 56. startup & shutdown time v cc =3v, g=6 db, c in = 1 f (5 ms/div) figure 57. startup & shutdown time v cc =5v , g=6 db, c in = 100 nf (5 ms/div) vo1 vo2 vo1 -vo2 standby vo1 vo2 vo1 -vo2 standby
electrical characteristic curves a21sp16 26/37 docid026037 rev 1 figure 58. startup & shutdown time v cc =3 v, g=6 db, c in = 100 nf (5 ms/div) figure 59. startup & shutdown time v cc = 5 v, g = 6 db, no c in (5 ms/div) vo1 vo2 vo1 -vo2 standby vo1 vo2 vo1 -vo2 standby figure 60. startup & shutdown time v cc =3 v, g=6 db, no c in (5 ms/div) vo1 vo2 vo1 -vo2 standby
docid026037 rev 1 27/37 a21sp16 application information 37 5 application information 5.1 differential configuration principle the a21sp16 is a monolithic fu lly-differential inpu t/output class d power amplifier. the a21sp16 also includes a common-mode feedback loop that controls t he output bias value to average it at v cc /2 for any dc common mo de input voltage. this allows the device to always have a maximum output voltage swing, and by consequence, maximizes the output power. moreover, as the load is connected differentially compared to a single-ended topology, the output is four times higher for the same power supply voltage. the advantages of a full-differential amplifier are: ? high psrr (power supply rejection ratio). ? high common mode noise rejection. ? virtually zero pop without additional circuitry, giving a faster start-up time compared to conventional single-ended input amplifiers. ? easier interfacing with differential output audio dac. ? no input coupling capacitors required due to common mode feedback loop. the main disadvantage is: ? as the differential function is directly link ed to external resistor mismatching, paying particular attention to this mismatching is mandatory in order to obtain the best performance from the amplifier. 5.2 gain in typical application schematic typical differential applications are shown in figure 1 on page 4 . in the flat region of the freq uency-response curve (no input coupling capacitor effect), the differential gain is expressed by the relation: with r in expressed in k ?? due to the tolerance of the internal 150 k ? feedback resistor, the di fferential gain will be in the range (no tolerance on r in ): a v diff out + out - ? in + in - ? ------------------------------- 300 r in --------- - == 273 r in --------- - a v diff 327 r in --------- - ??
application information a21sp16 28/37 docid026037 rev 1 5.3 common mode feedback loop limitations as explained previously, the common mode fe edback loop allows the output dc bias voltage to be averaged at v cc /2 for any dc common mode bias input voltage. however, due to v icm limitation in the input stage (see table 3: operating conditions on page 3 ), the common mode feedback loop can ensure its role only within a defined range. this range depends upon the values of v cc and r in (a vdiff ). to have a good estimation of the v icm value, we can apply this formula (no tolerance on r in ): with and the result of the calculation must be in the range: due to the +/-9% tolerance on the 150k ? resistor, it?s also important to check v icm in these conditions: if the result of v icm calculation is not in the previous range, input coupling capacitors must be used (with v cc from 2.4 v to 2.5 v, input coupling capacitors are mandatory). for example: with v cc =3 v, r in = 150 k ? and v ic = 2.5 v, we typically find v icm = 2 v and this is lower than 3v - 0.8 v = 2.2 v. with 136.5 k ? we find 1.97 v, and with 163.5 k ? we have 2.02 v. so, no input coupling capacitors are required. 5.4 low frequency response if a low frequency bandwid th limitation is requested, it is possible to use input coupling capacitors. in the low frequency region, c in (input coupling capacitor) starts to have an effect. c in forms, with r in , a first order high-pass filter with a -3db cut-off frequency: so, for a desired cut-off frequency we can calculate c in , with r in in ? and f cl in hz. v icm v cc r in ? 2v ic ? 150k ? ? + 2r in 150k ? + ?? ? --------------------------------------------------------------------------- - (v) = v ic in + in - + 2 --------------------- (v) = 0.5v v icm v cc 0.8v ? ?? ? 2v ic ? 136.5k ? ? + 2r in 136.5k ? + ?? ? -------------------------------------------------------------------------------- - v icm v cc r in ? 2v ic ? 163.5k ? ? + 2r in 163.5k ? + ?? ? -------------------------------------------------------------------------------- - ?? ? r in ? c in ? ------------------------------------ (hz) = c in 1 2 ? r in ? f cl ? ------------------------------------- - (f) =
docid026037 rev 1 29/37 a21sp16 application information 37 5.5 decoupling of the circuit a power supply capacitor, referred to as c s, is needed to correctly bypass the a21sp16. the a21sp16 has a typical switching frequency at 250 khz and output fall and rise time about 5 ns. due to these very fast transients, careful decoupling is mandatory. a 1 f ceramic capacitor is enough, but it must be located very close to the a21sp16 in order to avoid any extra parasitic inductance created an overly long track wire. in relation with di/dt, this parasitic inductance introduces an overvoltage that decreases the global efficiency and, if it is too high, may cause a breakdown of the device. in addition, even if a ceramic capacitor has an adequate high frequency esr value, its current capability is also important. a 0603 size is a good compromise , particularly when a 4 ? load is used. another important parameter is the rated voltage of the capacitor. a 1 f/6.3 v capacitor used at 5 v, loses about 50% of its value. in fact, with a 5 v power supply voltage, the decoupling value is about 0.5 f instead of 1 f. as c s has particular influence on the thd+n in the medium-high frequency region, this capacitor variation becomes decisive. in addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply amr value (6 v). 5.6 wake-up time (t wu ) when the standby is released to set the device on, there is a wait of about 5 ms. the a21sp16 has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise. 5.7 shutdown time (t stby ) when the standby command is set, the time requi red to put the two outp ut stages into high impedance and to put the internal circuitry in shutdown mode, is about 5 ms. this time is used to decrease the gain and avoid any pop noise during shutdown. 5.8 consumption in shutdown mode between the shutdown pin and gnd there is an internal 300 k ? resistor. this resistor forces the a21sp16 to be in standby mode when the standby input pin is left floating. however, this resistor also introduces additi onal power consumption if the shutdown pin voltage is not 0 v. for example, with a 0.4 v standby voltage pin, table 3: operating conditions on page 3 , shows that you must add 0.4 v/300 k ? = 1.3 a in typical (0.4 v/273 k ? = 1.46 a in maximum) to the shutdown current specified in table 5 on page 5 . 5.9 single-ended input configuration it is possible to use the a21sp16 in a single-ended input configuration. however, input coupling capacitors are needed in this configuration. the schematic in figure 61 shows a single-ended input typical application.
application information a21sp16 30/37 docid026037 rev 1 figure 61. single-ended input typical application all formulas are identical except for the gain (with r in in k ?? : and, due to the internal resistor tolerance we have: in the event that multiple single-ended inpu ts are summed, it is important that the impedance on both a21sp16 inputs (in - and in + ) are equal. figure 62. typical application schematic with multiple single-ended inputs rin rin cs 1u gnd gnd vcc speaker in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k ts4962 cin cin ve gnd gnd standby a v gle sin v e out + out - ? ------------------------------- 300 r in --------- - == 273 r in --------- - a v gle sin 327 r in --------- - ?? rin1 req cs 1u gnd gnd vcc speaker cin1 ceq ve1 gnd gnd standby rink cink vek gnd in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k ts4962
docid026037 rev 1 31/37 a21sp16 application information 37 we have the following equations: in general, for mixed situations (single-ended an d differential inputs), it is best to use the same rule, that is, to equalize impedance on both a21sp16 inputs. 5.10 output filter considerations the a21sp16 is designed to operate without an output filter. however, due to very sharp transients on the a21sp16 output, emi radiated emissions may cause some standard compliance issues. these emi standard compliance issues can appear if the distance between the a21sp16 outputs and loudspeaker terminal is long (typ ically more than 50 mm, or 100 mm in both directions, to the speaker terminals). as the pcb layout and internal equipment device are different for each configuration, it is difficult to provide a one-size-fits-all solution. however, to decrease the probability of emi is sues, there are several simple rules to follow: ? reduce, as much as possible, the distance between the a21sp16 output pins and the speaker terminals. ? use ground planes for ?shielding? sensitive wires. ? place, as close as possible to the a21sp16 and in series with each output, a ferrite bead with a rated current at minimum 2 a and impedance greater than 50 ?? at frequencies above 30 mhz. if, after testin g, these ferrite beads are not necessary, replace them by a short-circuit. murata blm18eg221sn1 or blm18eg121sn1 are possible examples of devices you can use. ? allow enough footprint to place, if necessar y, a capacitor to short perturbations to ground (see the schematics in figure 63 ). figure 63. method for shorting pertubations to ground in the case where the distance between the a21sp16 outputs and speaker terminals is high, it is possible to have low frequency emi is sues due to the fact th at the typical operating frequency is 250 khz. in this configuration, we recommend using an output filter (as shown out + out - ? v e1 300 r in1 ------------ - ?? v ek 300 r ink ------------ - ? (v) ++ = c eq k ? j1 = c inj = c inj 1 2 ? r inj f ? ? ? clj ---------------------------------------------------- ( f ) = r eq 1 1 r inj ---------- j1 = k ? ------------------- = ferrite chip bead about 100pf gnd from ts4962 output to speaker
application information a21sp16 32/37 docid026037 rev 1 in figure 1: typical application schematics on page 4 ). it should be placed as close as possible to the device. 5.11 different example s with summed inputs example 1: dual differential inputs figure 64. typical application schematic with dual differential inputs with (r i in k ? ): r1 r1 cs 1u gnd gnd vcc speaker standby r2 r2 e1+ e1- e2- e2+ in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k ts4962 a v 1 out + out - ? e 1 + e 1 - ? ------------------------------- 300 r 1 --------- - == a v 2 out + out - ? e 2 + e 2 - ? ------------------------------- 300 r 2 --------- - == 0.5v v cc r 1 ? r 2 300 v ic1 r 2 v ic2 + ? r 1 ? ?? ? + ? 300 r 1 r 2 + ?? 2r 1 ? r 2 ? + ? --------------------------------------------------------------------------------------------------------------------------- v cc 0.8v ? ?? + 2 ------------------------ = and v ic 2 e 2 + e 2 - + 2 ------------------------ =
docid026037 rev 1 33/37 a21sp16 application information 37 example 2: one differential in put plus one single-ended input figure 65. typical application schematic with one differential input plus one single- ended input with (r i in k ? ): r1 r2 cs 1u gnd gnd vcc speaker standby r2 r1 e1+ e2- e2+ in- stdby in+ out- out+ vcc c2 c1 a1 a2 a3 b1 b2 b3 c3 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k ts4962 c1 c1 gnd a v 1 out + out - ? e 1 + ------------------------------- 300 r 1 --------- - == a v 2 out + out - ? e 2 + e 2 - ? ------------------------------- 300 r 2 --------- - == c 1 1 2 ? r 1 ? f cl ? ------------------------------------ (f) =
footprint recommendations a21sp16 34/37 docid026037 rev 1 6 footprint recommendations figure 66. footprint recommendations pad in cu 18 ? m with flash niau (2-6 ? m, 0.2 ? m max.) 150 ? m min. 500 ? m 500 ? m 500 ? m 500 ? m ? =250 ? m ? =400 ? m typ. 75m min. 100 ? m max. track non solder mask opening ? =340 ? m min. pad in cu 18 ? m with flash niau (2-6 ? m, 0.2 ? m max.) 150 ? m min. 500 ? m 500 ? m 500 ? m 500 ? m ? =250 ? m ? =400 ? m typ. 75m min. 100 ? m max. track non solder mask opening ? =340 ? m min.
docid026037 rev 1 35/37 a21sp16 package information 37 7 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions a nd product status are available at: www.st.com . ecopack ? is an st trademark. figure 67. pin-out for 9-bump flip-chip (top view) figure 68. marking for 9-bump flip-chip (top view) figure 69. mechanical data for 9-bump flip-chip v dd 1/a1 7/c1 8/c2 9/c3 4/b1 6/b3 2/a2 3/a3 5/b2 v dd in - in + gnd stby gnd out + out - v dd 1/a1 7/c1 8/c2 9/c3 4/b1 6/b3 2/a2 3/a3 5/b2 v dd in - in + gnd stby gnd out + out - ? bumps are underneath ? bump diameter = 300 ? m ? st logo ? symbol for lead-free: e ? two first xx product code: w2 ? third x: assembly code ? three digits date code: y for year - ww for week ? the dot is for marking pin a1 xxx yww e xxx yww e ? die size: 1.6 mm x 1.6 mm 30 ?? m ? die height (including bumps): 600 ? m ? bump diameter: 315 ?? m ? 50 ? m ? bump diameter before reflow: 300 ? m ? 10 ? m ? bump height: 250 ? m 40 ? m ? die height: 350 ? m 20 ? m ? pitch: 500 ? m ? 50 ? m ? coplanarity: 50 ? m max 1.60 mm 1.60 mm 0.5mm 0.5mm ? 0.25mm 1.60 mm 1.60 mm 0.5mm 0.5mm ? 0.25mm 600m 600m
revision history a21sp16 36/37 docid026037 rev 1 8 revision history table 11. document revision history date revision changes 06-mar-2014 1 initial release.
docid026037 rev 1 37/37 a21sp16 37 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems wi th product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2014 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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