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october 2004 revision 3 1/25 operating from v cc = 2.2v to 5.5v 1.2w output power @ vcc=5v, thd=1%, f=1khz, with 8 ? load ultra-low consumption in standby mode (10na) 62db psrr @ 217hz in grounded mode near-zero pop & click ultra-low distortion (0.1%) unity gain stable available in a 9-bump flip-chip, miniso8 and dfn8 packages description the ts4990 has been designed for demanding audio applications such as mobile phones and to minimize the number of external components. this audio power amplifier is capable of delivering 1.2w of continuous rms output power into an 8 ? load @ 5v. an externally-controlled standby mode reduces the supply current to less than 10na. it also includes internal thermal shutdown protection. the unity-gain stable amplifier can be configured by external gain setting resistors. pin connections (top view) applications mobile phones (cellular / cordless) laptop / notebook computers pdas portable audio devices order codes ts4990ijt/TS4990EIJT - flip chip 1 2 3 4 5 8 7 6 standby bypass v out 2 v in- v in+ vcc v out 1 gnd 1 2 3 4 5 8 7 6 standby bypass v out 2 v in- v in+ vcc v out 1 gnd ts4990iqt - dfn8 standby bypass v+ in v in- v2 out gnd v cc v out1 1 2 3 4 8 7 6 5 ts4990ist - miniso8 vin- gnd bypass vout2 vcc vin+ vout1 gnd stby vin- gnd bypass vout2 vcc vin+ vout1 gnd stby part number temperature range package packing marking ts4990ijt TS4990EIJT 1 1) lead free flip-chip part number -40, +85c flip-chip tape & reel a90 ts4990ist mini so tape & reel k990 ts4990iqt dfn tape & reel k990 ts4990ekijt -40, +85c fc+back coating tape & reel a90 ts4990 1.2w audio power amplifier with active-low standby mode
ts4990 absolute maximum ratings 2/25 figure 1: typical application schematic 1 absolute maximum ratings table 2:operating conditions table 1:key parameters and their absolute maximum ratings symbol parameter value unit vcc supply voltage 1 1) all voltage values are measured with respect to the ground pin. 6v v i input voltage 2 2) the magnitude of input signal must never exceed v cc + 0.3v / g nd - 0.3v g nd 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 flip-chip 3 miniso8 dfn8 3) device is protected in case of over temperature by a thermal shutdown active @ 150 c. 250 215 120 c/w pd power dissipation internally limited esd human body model 2 kv esd machine model 200 v latch-up immunity 200ma lead temperature (soldering, 10sec) lead temperature (soldering, 10sec) for lead-free version 250 260 c symbol parameter value unit v cc supply voltage 2.2 to 5.5 v v icm common mode input voltage range 1.2v to v cc v vstb standby voltage input: device on device off 1.35 v stb v cc gnd v stb 0.4 v rl load resistor 4 ? rout- gnd resistor output to gnd (v stb = gnd) 1m ? tsd thermal shutdown temperature 150 c rthja thermal resistance junction to ambient flip-chip 1 miniso8 dfn8 2 1) this thermal resistance is reached with a 100mm 2 copper heatsink surface. 2) when mounted on a 4-layer pcb. 100 190 40 c/w rfeed rin audio in cfeed vcc cin + cs + cb standby control speaker 8ohms bias av = -1 vin- vin+ bypass standby vcc gnd vout 1 vout 2 + - + - ts4990
electrical characteristics ts4990 3/25 2 electrical characteristics table 3:electrical characteristics when v cc = +5v, gnd = 0v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 3.7 6 ma i standby standby current 1 no input signal, vstdby = g nd , rl = 8 ? 1) standby mode is activated when vstdby is tied to gnd 10 1000 na voo output offset voltage no input signal, rl = 8 ? 110 mv po output power thd = 1% max, f = 1khz, rl = 8 ? 0.9 1.2 w thd + n total harmonic distortion + noise po = 1wrms, av = 2, 20hz f 20khz, rl = 8 ? 0.2 % psrr power supply rejection ratio 2 rl = 8 ?, av = 2 , vripple = 200mvpp, input grounded f = 217hz f = 1khz 2) all psrr data limits are guaranteed by production sampling tests dynamic measurements - 20*log(rms(vout)/rms(vripple)). vripple is the sinusoidal signal superimposed upon vcc. 55 55 62 64 db t wu wake-up time (cb = 1f) 90 130 ms t stdb standby time (cb = 1f) 10 s v stdbh standby voltage level high 1.3 v v stdbl standby voltage level low 0.4 v m phase margin at unity gain r l = 8 ? , c l = 500pf 65 degrees gm gain margin r l = 8 ? , c l = 500pf 15 db gbp gain bandwidth product r l = 8 ? 1.5 mhz
ts4990 electrical characteristics 4/25 table 4:electrical characteristics when v cc = +3.3v, gnd = 0v, t amb = 25 c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 3.3 6 ma i standby standby current 1 no input signal, vstdby = g nd , rl = 8 ? 1) standby mode is activated when vstdby is tied to gnd 10 1000 na voo output offset voltage no input signal, rl = 8 ? 110 mv po output power thd = 1% max, f = 1khz, rl = 8 ? 375 500 mw thd + n total harmonic distortion + noise po = 400mwrms, av = 2, 20hz f 20khz, rl = 8 ? 0.1 % psrr power supply rejection ratio 2 rl = 8 ?, av = 2 , vripple = 200mvpp, input grounded f = 217hz f = 1khz 2) all psrr data limits are guaranteed by production sampling tests dynamic measurements - 20*log(rms(vout)/rms(vripple)). vripple is the sinusoidal signal superimposed upon vcc. 55 55 61 63 db t wu wake-up time (cb = 1f) 11 0 14 0 ms t stdb standby time (cb = 1f) 10 s v stdbh standby voltage level high 1.2 v v stdbl standby voltage level low 0.4 v m phase margin at unity gain r l = 8 ? , c l = 500pf 65 degrees gm gain margin r l = 8 ? , c l = 500pf 15 db gbp gain bandwidth product r l = 8 ? 1.5 mhz
electrical characteristics ts4990 5/25 table 5:electrical characteristics when v cc = 2.6v, gnd = 0v, t amb = 25 c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 3.1 6 ma i standby standby current 1 no input signal, vstdby = g nd , rl = 8 ? 1) standby mode is activated when vstdby is tied to gnd 10 1000 na voo output offset voltage no input signal, rl = 8 ? 110 mv po output power thd = 1% max, f = 1khz, rl = 8 ? 220 300 mw thd + n total harmonic distortion + noise po = 200mwrms, av = 2, 20hz f 20khz, rl = 8 ? 0.1 % psrr power supply rejection ratio 2 rl = 8 ?, av = 2 , vripple = 200mvpp, input grounded f = 217hz f = 1khz 2) all psrr data limits are guaranteed by production sampling tests dynamic measurements - 20*log(rms(vout)/rms(vripple)). vripple is the sinusoidal signal superimposed upon vcc. 55 55 60 62 db t wu wake-up time (cb = 1f) 125 150 ms t stdb standby time (cb = 1f) 10 s v stdbh standby voltage level high 1.2 v v stdbl standby voltage level low 0.4 v m phase margin at unity gain r l = 8 ? , c l = 500pf 65 degrees gm gain margin r l = 8 ? , c l = 500pf 15 db gbp gain bandwidth product r l = 8 ? 1.5 mhz table 6:components description components functional description r in inverting input resistor which sets the closed loop gain in conjunction with r feed . this resistor also forms a high pass filter with c in (fc = 1 / (2 x pi x rin x cin)) c in input coupling capacitor which blocks the dc voltage at the amplifier input terminal. r feed feed back resistor which sets the closed loop gain in conjunction with r in . c s supply bypass capacitor which provides power supply filtering. c b bypass pin capacitor which provides half supply filtering. c feed low pass filter capacitor allowing to cut the high frequency (low pass filter cut-off frequency 1 / (2 x pi x r feed x c feed )) av closed loop gain in btl configuration = 2 x (r feed / r in ) exposed pad dfn8 exposed pad is electricaly connected to pin7. see page 24 for more information.
ts4990 electrical characteristics 6/25 figure 2: open loop frequency response figure 3: open loop frequency response figure 4: open loop frequency response figure 5: open loop frequency response figure 6: open loop frequency response figure 7: open loop frequency response 0.1 1 10 100 1000 10000 -60 -40 -20 0 20 40 60 -200 -160 -120 -80 -40 0 gain phase gain (db) frequency (khz) vcc = 5v rl = 8 ? tamb = 25 c phase ( ) 0.1 1 10 100 1000 10000 -60 -40 -20 0 20 40 60 -200 -160 -120 -80 -40 0 gain phase gain (db) frequency (khz) vcc = 3.3v rl = 8 ? tamb = 25 c phase ( ) 0.1 1 10 100 1000 10000 -60 -40 -20 0 20 40 60 -200 -160 -120 -80 -40 0 gain phase gain (db) frequency (khz) vcc = 2.6v rl = 8 ? tamb = 25 c phase ( ) 0.1 1 10 100 1000 10000 -40 -20 0 20 40 60 80 100 -200 -160 -120 -80 -40 0 gain phase gain (db) frequency (khz) vcc = 5v cl = 560pf tamb = 25 c phase ( ) 0.1 1 10 100 1000 10000 -40 -20 0 20 40 60 80 100 -200 -160 -120 -80 -40 0 gain phase gain (db) frequency (khz) vcc = 3.3v cl = 560pf tamb = 25 c phase ( ) 0.1 1 10 100 1000 10000 -40 -20 0 20 40 60 80 100 -200 -160 -120 -80 -40 0 gain phase gain (db) frequency (khz) vcc = 2.6v cl = 560pf tamb = 25 c phase ( )
electrical characteristics ts4990 7/25 figure 8: power supply rejection ratio (psrr) vs power supply figure 9: power supply rejection ratio (psrr) vs power supply figure 10: power supply rejection ratio (psrr) vs power supply figure 11: power supply rejection ratio (psrr) vs power supply figure 12: power supply rejection ratio (psrr) vs power supply figure 13: power supply rejection ratio (psrr) vs power supply 100 1000 10000 100000 -70 -60 -50 -40 -30 -20 -10 0 vcc : 2.2v 2.6v 3.3v 5v vripple = 200mvpp av = 2 input = grounded cb = cin = 1 f rl >= 4 ? tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 100000 -50 -40 -30 -20 -10 0 vcc : 2.2v 2.6v 3.3v 5v vripple = 200mvpp av = 10 input = grounded cb = cin = 1 f rl >= 4 ? tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 100000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc = 2.2, 2.6, 3.3, 5v vripple = 200mvpp rfeed = 22k ? input = floating cb = 1 f rl >= 4 ? tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 100000 -60 -50 -40 -30 -20 -10 0 vcc : 2.2v 2.6v 3.3v 5v vripple = 200mvpp av = 5 input = grounded cb = cin = 1 f rl >= 4 ? tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 100000 -60 -50 -40 -30 -20 -10 0 vcc = 5, 3.3, 2.5 & 2.2v vripple = 200mvpp av = 2 input = grounded cb = 0.1 f, cin = 1 f rl >= 4 ? tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 100000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc = 2.2, 2.6, 3.3, 5v vripple = 200mvpp rfeed = 22k ? input = floating cb = 0.1 f rl >= 4 ? tamb = 25 c psrr (db) frequency (hz)
ts4990 electrical characteristics 8/25 figure 14: power supply rejection ratio (psrr) vs dc output voltage figure 15: power supply rejection ratio (psrr) vs dc output voltage figure 16: power supply rejection ratio (psrr) vs dc output voltage figure 17: power supply rejection ratio (psrr) vs dc output voltage figure 18: power supply rejection ratio (psrr) vs dc output voltage figure 19: power supply rejection ratio (psrr) vs dc output voltage -5-4-3-2-1012345 -70 -60 -50 -40 -30 -20 -10 0 vcc = 5v vripple = 200mvpp rl = 8 ? cb = 1 f av = 2 tamb = 25 c psrr (db) differential dc output voltage (v) -5-4-3-2-1012345 -50 -40 -30 -20 -10 0 vcc = 5v vripple = 200mvpp rl = 8 ? cb = 1 f av = 10 tamb = 25 c psrr (db) differential dc output voltage (v) -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -60 -50 -40 -30 -20 -10 0 vcc = 3.3v vripple = 200mvpp rl = 8 ? cb = 1 f av = 5 tamb = 25 c psrr (db) differential dc output voltage (v) -5-4-3-2-1012345 -60 -50 -40 -30 -20 -10 0 vcc = 5v vripple = 200mvpp rl = 8 ? cb = 1 f av = 5 tamb = 25 c psrr (db) differential dc output voltage (v) -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -70 -60 -50 -40 -30 -20 -10 0 vcc = 3.3v vripple = 200mvpp rl = 8 ? cb = 1 f av = 2 tamb = 25 c psrr (db) differential dc output voltage (v) -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -50 -40 -30 -20 -10 0 vcc = 3.3v vripple = 200mvpp rl = 8 ? cb = 1 f av = 10 tamb = 25 c psrr (db) differential dc output voltage (v)
electrical characteristics ts4990 9/25 figure 20: power supply rejection ratio (psrr) vs dc output voltage figure 21: power supply rejection ratio (psrr) vs dc output voltage figure 22: output power vs power supply voltage figure 23: power supply rejection ratio (psrr) vs dc output voltage figure 24: power supply rejection ratio (psrr) at f=217hz vs bypass capacitor figure 25: output power vs power supply voltage -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 -70 -60 -50 -40 -30 -20 -10 0 vcc = 2.6v vripple = 200mvpp rl = 8 ? cb = 1 f av = 2 tamb = 25 c psrr (db) differential dc output voltage (v) -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 -50 -40 -30 -20 -10 0 vcc = 2.6v vripple = 200mvpp rl = 8 ? cb = 1 f av = 10 tamb = 25 c psrr (db) differential dc output voltage (v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 thd+n=10% rl = 4 ? f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) vcc (v) -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 -60 -50 -40 -30 -20 -10 0 vcc = 2.6v vripple = 200mvpp rl = 8 ? cb = 1 f av = 5 tamb = 25 c psrr (db) differential dc output voltage (v) 0.1 1 -80 -70 -60 -50 -40 -30 av=10 vcc: 2.6v 3.3v 5v av=5 vcc: 2.6v 3.3v 5v av=2 vcc: 2.6v 3.3v 5v tamb=25 c psrr at 217hz (db) bypass capacitor cb ( f) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 thd+n=10% rl = 8 ? f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) vcc (v)
ts4990 electrical characteristics 10/25 figure 26: output power vs power supply voltage figure 27: output power vs load resistor figure 28: output power vs load resistor figure 29: output power vs power supply voltage figure 30: output power vs load resistor figure 31: power dissipation vs pout 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.2 0.4 0.6 0.8 1.0 1.2 thd+n=10% rl = 16 ? f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) vcc (v) 4 8 12 16 20 24 28 32 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 thd+n=10% vcc = 5v f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) load resistance ( ) 4 8 12 16 20 24 28 32 0.0 0.1 0.2 0.3 0.4 0.5 0.6 thd+n=10% vcc = 2.6v f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) load resistance ( ) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.1 0.2 0.3 0.4 0.5 0.6 thd+n=10% rl = 32 ? f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) vcc (v) 8 162432 0.0 0.2 0.4 0.6 0.8 1.0 thd+n=10% vcc = 3.3v f = 1khz bw < 125khz tamb = 25 c thd+n=1% output power (w) load resistance ( ) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 rl=16 ? rl=8 ? vcc=5v f=1khz thd+n<1% rl=4 ? power dissipation (w) output power (w)
electrical characteristics ts4990 11/25 figure 32: power dissipation vs pout figure 33: power derating curves figure 34: clipping voltage vs power supply voltage and load resistor figure 35: power dissipation vs pout figure 36: clipping voltage vs power supply voltage and load resistor figure 37: current consumption vs power supply voltage 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.0 0.1 0.2 0.3 0.4 0.5 0.6 rl=4 ? rl=8 ? vcc=3.3v f=1khz thd+n<1% rl=16 ? power dissipation (w) output power (w) 0 25 50 75 100 125 150 0.0 0.2 0.4 0.6 0.8 1.0 1.2 no heat sink heat sink surface 100mm 2 (see demoboard) flip-chip package power dissipation (w) ambiant temperature ( c) 2.5 3.0 3.5 4.0 4.5 5.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 tamb = 25 c rl = 16 ? rl = 8 ? rl = 4 ? vout1 & vout2 clipping voltage low side (v) power supply voltage (v) 0.0 0.1 0.2 0.3 0.4 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 rl=4 ? rl=8 ? vcc=2.6v f=1khz thd+n<1% rl=16 ? power dissipation (w) output power (w) 2.5 3.0 3.5 4.0 4.5 5.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 tamb = 25 c rl = 16 ? rl = 8 ? rl = 4 ? vout1 & vout2 clipping voltage high side (v) power supply voltage (v) 012345 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 no load tamb=25 c current consumption (ma) power supply voltage (v)
ts4990 electrical characteristics 12/25 figure 38: current consumption vs standby voltage @ vcc = 5v figure 39: current consumption vs standby voltage @ vcc = 2.6v figure 40: thd + n vs output power figure 41: current consumption vs standby voltage @ vcc = 3.3v figure 42: current consumption vs standby voltage @ vcc = 2.2v figure 43: thd + n vs output power 012345 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 vcc = 5v no load tamb=25 c current consumption (ma) standby voltage (v) 0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 vcc = 2.6v no load tamb=25 c current consumption (ma) standby voltage (v) 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 4 ? f = 20hz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 vcc = 3.3v no load tamb=25 c current consumption (ma) standby voltage (v) 0.0 0.5 1.0 1.5 2.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 vcc = 2.2v no load tamb=25 c current consumption (ma) standby voltage (v) 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 8 ? f = 20hz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w)
electrical characteristics ts4990 13/25 figure 44: thd + n vs output power figure 45: thd + n vs output power figure 46: thd + n vs output power figure 47: thd + n vs output power figure 48: thd + n vs output power figure 49: thd + n vs output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 16 ? f = 20hz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 8 ? f = 1khz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 4 ? f = 20khz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 4 ? f = 1khz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 16 ? f = 1khz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 8 ? f = 20khz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w)
ts4990 electrical characteristics 14/25 figure 50: thd + n vs output power figure 51: thd + n vs frequency figure 52: signal to noise ratio vs power supply with unweighted filter (20hz to 20khz) figure 53: thd + n vs frequency figure 54: thd + n vs frequency figure 55: signal to noise ratio vs power supply with unweighted filter (20hz to 20khz) 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=5v vcc=3.3v vcc=2.6v vcc=2.2v rl = 16 ? f = 20khz av = 2 cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) 100 1000 10000 0.01 0.1 vcc=2.2v, po=130mw vcc=5v, po=1w rl=8 ? av=2 cb = 1 f bw < 125khz tamb = 25 c 20k 20 thd + n (%) frequency (hz) 2.5 3.0 3.5 4.0 4.5 5.0 80 85 90 95 100 105 110 av = 2 cb = 1 f thd+n < 0.7% tamb = 25 c rl=16 ? rl=4 ? rl=8 ? signal to noise ratio (db) power supply voltage (v) 100 1000 10000 0.1 1 vcc=2.2v, po=150mw vcc=5v, po=1.3w rl=4 ? av=2 cb = 1 f bw < 125khz tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 vcc=2.2v, po=100mw vcc=5v, po=0.55w rl=16 ? av=2 cb = 1 f bw < 125khz tamb = 25 c 20k 20 thd + n (%) frequency (hz) 2.5 3.0 3.5 4.0 4.5 5.0 70 75 80 85 90 95 av = 10 cb = 1 f thd+n < 0.7% tamb = 25 c rl=16 ? rl=4 ? rl=8 ? signal to noise ratio (db) power supply voltage (v)
electrical characteristics ts4990 15/25 figure 56: signal to noise ratio vs power supply with a weighted filter figure 57: output noise voltage device on figure 58: signal to noise ratio vs power supply with a weighted filter figure 59: output noise voltage device in standby 2.5 3.0 3.5 4.0 4.5 5.0 80 85 90 95 100 105 110 av = 2 cb = 1 f thd+n < 0.7% tamb = 25 c rl=16 ? rl=4 ? rl=8 ? signal to noise ratio (db) power supply voltage (v) 246810 10 15 20 25 30 35 40 45 vcc=2.2v to 5.5v cb=1 f rl=8 ? tamb=25 c a weighted filter unweighted filter output noise voltage ( vrms) closed loop gain 2.5 3.0 3.5 4.0 4.5 5.0 70 75 80 85 90 95 100 av = 10 cb = 1 f thd+n < 0.7% tamb = 25 c rl=16 ? rl=4 ? rl=8 ? signal to noise ratio (db) power supply voltage (v) 246810 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 vcc=2.2v to 5.5v cb=1 f rl=8 ? tamb=25 c a weighted filter unweighted filter output noise voltage ( vrms) closed loop gain
ts4990 application information 16/25 3 application information 3.1 btl configuration principle the ts4990 is a monolithic power amplifier with a btl output type. btl (bridge tied load) means that each end of the load is connected to two single-ended output amplifiers. thus, we have: single-ended output 1 = v out1 = v out (v) single ended output 2 = v out2 = -v out (v) and v out1 - v out2 = 2v out (v) the output power is: for the same power supply voltage, the output power in btl configuration is four times higher than the output power in single ended configuration. 3.2 gain in typical application schematic the typical application schematic is shown in page 1. in the flat region (no c in effect), the output voltage of the first stage is (in volts): for the second stage: v out2 = -v out1 (v) the differential output voltage is (in volts): the differential gain named gain (g v ) for more convenient usage is: v out2 is in phase with v in and v out1 is phased 180 with v in . this means that the positive terminal of the loudspeaker should be connected to v out2 and the negative to v out1 . 3.3 low and high frequency response in the low frequency region, c in starts to have an effect. c in forms with r in a high-pass filter with a - 3db cut-off frequency. f cl is in hz. in the high frequency region, you can limit the bandwidth by adding a capacitor (c feed ) in parallel with r feed . it forms a low-pass filter with a -3db cut-off frequency. f ch is in hz. the following graph shows an example of c in and c feed influence. figure 60: frequency response gain vs cin, & cfeed 3.4 power dissipation and efficiency hypotheses: load voltage and current are sinusoidal (v out and i out ) supply voltage is a pure dc source (v cc ) regarding the load we have: p out 2v outrms () 2 r l ---------------------------------- = v out1 v ? in () r feed r in -------------- = v out2 v out1 ? 2v in r feed r in -------------- = g v v out2 v out1 ? v in ---------------------------------- 2 r feed r in -------------- == f cl 1 2 r in c in ------------------------ = f ch 1 2 r feed c feed ------------------------------------- = 10 100 1000 10000 -25 -20 -15 -10 -5 0 5 10 rin = rfeed = 22k ? tamb = 25 c cfeed = 2.2nf cfeed = 680pf cfeed = 330pf cin = 470nf cin = 82nf cin = 22nf gain (db) frequency (hz) v out = v peak sin t (v)
application information ts4990 17/25 and and therefore, the average current delivered by the supply voltage is: the power delivered by the supply voltage is: psupply = vcc icc av g (w) then, the power dissipated by each amplifier is p diss = p supply - p out (w) and the maximum value is obtained when: and its value is: note: this maximum value is only dependent on power supply voltage and load values. the efficiency is the ratio between the output power and the power supply the maximum theoretical value is reached when vpeak = vcc, so 3.5 decoupling of the circuit two capacitors are needed to correctly bypass the ts4990. a power supply bypass capacitor c s and a bias voltage bypass capacitor c b . c s has particular influence on the thd+n in the high frequency region (above 7khz) and an indirect influence on power supply disturbances. with a value for c s of 1f, you can expect similar thd+n performances to those shown in the datasheet. in the high frequency region, if c s is lower than 1f, it increases thd+n and disturbances on the power supply rail are less filtered. on the other hand, if c s is higher than 1f, those disturbances on the power supply rail are more filtered. c b has an influence on thd+n at lower frequencies, but its function is critical to the final result of psrr (with input grounded and in the lower frequency region). if c b is lower than 1f, thd+n increases at lower frequencies and psrr worsens. if c b is higher than 1f, the benefit on thd+n at lower frequencies is small, but the benefit to psrr is substantial. note that c in has a non-negligible effect on psrr at lower frequencies. the lower the value of c in , the higher the psrr. 3.6 wake-up time: t wu when the standby is released to put the device on, the bypass capacitor c b will not be charged immediately. as c b is directly linked to the bias of the amplifier, the bias will not work properly until the c b voltage is correct. the time to reach this voltage is called wake-up time or t wu and specified in electrical characteristics table with c b =1f. if c b has a value other than 1f, please refer to the graph in figure 60 to establish the wake-up time value. i out = v out r l ------------- - (a) p out = v peak 2 2r l ---------------------- ( w ) i cc avg = 2 v peak r l ------------------- - (a) p diss 22v cc r l ---------------------- p out p out ? = ? pdiss ? p out --------------------- - = 0 ) w ( r vcc 2 max pdiss l 2 2 = = p out p supply -------------------- - = v peak 4v cc ----------------------- 4 ---- - = 78.5%
ts4990 application information 18/25 figure 61: typical wake-up time vs. c b due to process tolerances, the maximum value of wake-up time could be establish by the graph in figure 61: figure 62: maximum wake-up time vs. c b note: bypass capacitor c b as also a tolerance of typically +/-20%. to calculate the wake-up time with this tolerance, refer to the previous graph (considering for example for c b =1f in the range of 0.8f 1f 1.2f). 3.7 shutdown time when the standby command is set, the time required to put the two output stages in high impedance and the internal circuitry in shutdown mode is a few microseconds. note: in shutdown mode, bypass pin and vin- pin are short- circuited to ground by internal switches. this allows a quick discharge of c b and c in capacitors. 3.8 pop performance pop performance is intimately linked with the size of the input capacitor c in and the bias voltage bypass capacitor c b . the size of c in is dependent on the lower cut-off frequency and psrr values requested. the size of c b is dependent on thd+n and psrr values requested at lower frequencies. moreover, c b determines the speed with which the amplifier turns on. in order to reach near zero pop and click, the equivalent input constant time, in = (r in + 2k ? )xc in (s) with r in 5k ? must not reach the in maximum value as indicated in the graph below. figure 63: in max. versus bypass capacitor by following previous rules, the ts4990 can reach near zero pop and click even with high gains such as 20 db. example: with r in =22k ? and a 20 hz, -3 db low cut-off frequency, c in =361 nf. so, c in =390 nf with standard value which gives a lower cut-off frequency equal to 18.5 hz. in this case, (r in +2k ? )xc in = 9.36 ms. when referring to the previous graph, if c b =1 f and vcc = 5 v, we read 20 ms max. this value is twice as high as our current value, thus we can state that pop and click will be reduced to its lowest value. minimizing both c in and the gain benefits both the pop phenomena, and the cost and size of the application. 1234 0 100 200 300 400 500 600 4.7 0.1 tamb=25 c vcc=2.6v vcc=3.3v vcc=5v startup time (ms) bypass capacitor cb ( f) 1234 0 100 200 300 400 500 600 tamb=25 c 4.7 0.1 vcc=5v vcc=3.3v vcc=2.6v max. startup time (ms) bypass capacitor cb ( f) 1234 0 40 80 120 160 vcc=5v vcc=3.3v vcc=2.6v tamb=25 c in max. (ms) bypass capacitor cb ( f)
application information ts4990 19/25 3.9 application: differential inputs btl power amplifier the schematic in figure 63 shows how to design the ts4990 to work in a differential input mode. the gain of the amplifier is: in order to reach the optimal performance of the differential function, r 1 and r 2 should be matched at 1% max. figure 64: differential input amplifier configuration the input capacitor c in could be calculated by the following formula using the -3db lower frequency required. (f l is the lower frequency required) note: this formula is true only if: is 5 times lower than f l . the following bill of material is an example of a differential amplifier with a gain of 2 and a -3db lower cut-off frequency of about 80hz. components: 1 2 vdiff r r 2 g = r2 r1 neg. input vcc cin + cs + cb standby control speaker 8ohms bias av = -1 vin- vin+ bypass standby vcc gnd vout 1 vout 2 + - + - ts4990 r1 pos. input cin r2 designator part type r1 20k / 1% r2 20k / 1% c in 100nf c b =c s 1f u1 ts4990 ) f ( f r 2 1 c l 1 in ) hz ( c ) r r ( 2 1 f b 2 1 cb + =
ts4990 package mechanical data 20/25 4 package mechanical data 4.1 ts4990ijt pinout and package mechanical data 4.1.1 pinout (top view) 4.1.2 marking (top view) 4.1.3 package mechanical data for 9-bump flip-chip balls are underneath a c b 1 2 3 vin- gnd bypass vout2 vcc vin+ vout1 gnd stby a c b 1 2 3 vin- gnd bypass vout2 vcc vin+ vout1 gnd stby vin- gnd bypass vout2 vcc vin+ vout1 gnd stby st logo part number: a90 three digits datecode: yww e symbol for lead-free only the dot is for marking pin a1 symbol for lead-free version a90 yww e a90 yww e die size: 1.60 x 1.60 mm 30m die height (including bumps): 600m bump diameter: 315m 50m bump diameter before reflow: 300m 10m bump height: 250m 40m die height: 350m 20m pitch: 500m 50m coplanarity: 60m max * back coating height : 100m 10m * optional 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 100m 600m 100m
package mechanical data ts4990 21/25 4.1.4 daisy chain mechanical data remarks the daisy chain sample features two by two pin connections. the schematic above illustrates the way pins connect to each other. this sample is used to test continuity on your board. your pcb needs to be designed the opposite way, so that pins that are unconnected in the daisy chain sample, are connected on your pcb. if you do this, by simply connecting a ohmmeter between pin a1 and pin a3, the soldering process continuity can be tested. order code a c b 1 2 3 1.6mm 1.6mm a c b 1 2 3 1.6mm 1.6mm part number temperature range package marking j tsdc05ijt tsdc05eijt 1 -40, +85 c ? ? dc3 dc3 1) lead free daisy chain part number
ts4990 package mechanical data 22/25 4.1.5 ts4990 footprint recommendations 4.1.6 tape & reel specification (top view) device orientation the devices are oriented in the carrier pocket with pin number a1 adjacent to the sprocket holes. 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. user direction of feed a 1 a 1 8 die sizex + 70m die sizey + 70m 4 1.5 4 all dimensions are in mm user direction of feed a 1 a 1 a 1 a 1 8 die sizex + 70m die sizey + 70m 4 1.5 4 all dimensions are in mm
package mechanical data ts4990 23/25 4.2 mini so8 package mechanical data
ts4990 package mechanical data 24/25 4.3 dfn8 package mechanical data for enhanced thermal performance, the exposed pad must be soldered to a dfn8 exposed pad (e2 x d2) is connected to pin number 7. copper area on the pcb, acting as heatsink. this copper area can be electricaly connected to pin7 or left floating.
revision history ts4990 25/25 5 revision history date revision description of changes july 2002 1 first release september 2003 2 update mechanical data october 2004 3 order code for back coating on flip chip information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2004 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 - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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