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may 2007 rev 10 1/31 31 ts4990 1.2 w audio power amplifier with active low standby mode features operating range from v cc = 2.2 v to 5.5 v 1.2 w output power @ v cc = 5 v, thd = 1%, f = 1 khz, with 8 load ultra-low consumption in standby mode (10 na) 62 db psrr @ 217 hz in grounded mode near-zero pop & click ultra-low distortion (0.1%) unity gain stable available in 9-bump flip-chip, miniso-8 and dfn8 packages applications mobile phones (cellular / cordless) laptop / notebook computers pdas portable audio devices description the ts4990 is designed for demanding audio applications such as mobile phones to reduce the number of external components. this audio power amplifier is capable of delivering 1.2 w of continuous rms output power into an 8 load @ 5 v. an externally controlled standby mode reduces the supply current to less than 10 na. it also includes an internal thermal shutdown protection. the unity-gain stable amplifier can be configured by external gain setting resistors. ts4990ijt/ts4990eijt - flip-chip 9 bumps ts4990iqt - dfn8 ts4990ist - miniso-8 vin- gnd bypass vout2 vcc vin+ vout1 gnd stby vin- gnd bypass vout2 vcc vin+ vout1 gnd stby ts4990id/ts4990idt - so-8 stby bypass vin+ vin- vout1 v gnd vout2 1 2 3 4 8 5 7 6 cc stby bypass vin+ vin- vout1 v gnd vout2 1 2 3 4 8 5 7 6 cc 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 www.st.com
contents ts4990 2/31 contents 1 absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 typical application sc hematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.1 btl configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2 gain in a typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.3 low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.4 power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.5 decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.6 wake-up time (t wu ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.7 shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.8 pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.9 application example: differential input, btl power amplifier . . . . . . . . . . 22 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.1 flip-chip package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.2 miniso-8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 5.3 dfn8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5.4 so-8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 6 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
ts4990 absolute maximum rati ngs and operating conditions 3/31 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings (amr) symbol parameter value unit v cc supply voltage (1) 1. all voltage values are measur ed with respect to the ground pin. 6v v i input voltage (2) 2. 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 flip-chip (3) miniso-8 dfn8 3. the device is protected in case of over te mperature by a thermal shutdown active @ 150c. 250 215 120 c/w p diss power dissipation internally limited esd human body model 2 kv esd machine model 200 v latch-up immunity 200 ma lead temperature (soldering, 10sec) lead temperature (soldering, 10sec) for lead- free version 250 260 c table 2. operating conditions 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 v stby standby voltage input: device on device off 1.35 v stby v cc gnd v stby 0.4 v r l load resistor 4 r out-gnd resistor output to gnd (v stby = gnd) 1m t sd thermal shutdown temperature 150 c r thja thermal resistance junction to ambient flip-chip (1) miniso-8 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
typical application schematics ts4990 4/31 2 typical application schematics figure 1. typical application schematics table 3. component descriptions component functional description r in inverting input resistor that sets the closed loop gain in conjunction with r feed . this resistor also forms a high pass filter with c in (f c = 1 / (2 x pi x r in x c in )). c in input coupling capacitor that blocks the dc voltage at the amplifier input terminal. r feed feed back resistor that sets the closed loop gain in conjunction with r in . c s supply bypass capacitor that provides power supply filtering. c b bypass pin capacitor that 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 )). a v closed loop gain in btl configuration = 2 x (r feed / r in ). exposed pad dfn8 exposed pad is electrically connected to pin 7. see dfn8 package mechanical data on page 28 for more information. 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
ts4990 electrical characteristics 5/31 3 electrical characteristics table 4. electrical characteristics when v cc = +5 v, gnd = 0 v, 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 stby standby current (1) no input signal, v stby = gnd, r l = 8 1. standby mode is activated when v stby is tied to gnd. 10 1000 na v oo output offset voltage no input signal, r l = 8 110mv p out output power thd = 1% max, f = 1khz, r l = 8 0.9 1.2 w thd + n total harmonic distortion + noise p out = 1w rms , a v = 2, 20hz f 20khz, r l = 8 0.2 % psrr power supply rejection ratio (2) r l = 8 , a v = 2 , v ripple = 200mv pp , input grounded f = 217hz f = 1khz 2. all psrr data limits are guarant eed by production sampling tests. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the sinusoidal signal superimposed upon v cc . 55 55 62 64 db t wu wake-up time (c b = 1f) 90 130 ms t stby standby time (c b = 1f) 10 s v stbyh standby voltage level high 1.3 v v stbyl 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 6/31 table 5. electrical characteristics when v cc = +3.3 v, gnd = 0 v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 3.3 6 ma i stby standby current (1) no input signal, v stby = gnd, r l = 8 1. standby mode is activated when v stby is tied to gnd. 10 1000 na v oo output offset voltage no input signal, r l = 8 110mv p out output power thd = 1% max, f = 1khz, r l = 8 375 500 mw thd + n total harmonic distortion + noise p out = 400mw rms , a v = 2, 20hz f 20khz, r l =8 0.1 % psrr power supply rejection ratio (2) r l = 8 , a v = 2 , v ripple = 200mv pp , input grounded f = 217hz f = 1khz 2. all psrr data limits are guarant eed by production sampling tests. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the sinusoidal signal superimposed upon v cc . 55 55 61 63 db t wu wake-up time (c b = 1f) 110 140 ms t stby standby time (c b = 1f) 10 s v stbyh standby voltage level high 1.2 v v stbyl 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 7/31 table 6. electrical characteristics when v cc = 2.6v, gnd = 0v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 3.1 6 ma i stby standby current (1) no input signal, v stby = gnd, r l = 8 1. standby mode is activated when v stby is tied to gnd. 10 1000 na v oo output offset voltage no input signal, r l = 8 110mv p out output power thd = 1% max, f = 1khz, r l = 8 220 300 mw thd + n total harmonic distortion + noise p out = 200mw rms , a v = 2, 20hz f 20khz, r l =8 0.1 % psrr power supply rejection ratio (2) r l = 8 , a v = 2 , v ripple = 200mv pp , input grounded f = 217hz f = 1khz 2. all psrr data limits are guarant eed by production sampling tests. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the sinusoidal signal superimposed upon v cc . 55 55 60 62 db t wu wake-up time (c b = 1f) 125 150 ms t stby standby time (c b = 1f) 10 s v stbyh standby voltage level high 1.2 v v stbyl 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 8/31 figure 2. open loop frequency response figure 3. 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 () figure 4. open loop frequency response figure 5. 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 = 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 () figure 6. open loop frequency response figure 7. open loop frequency response 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 ()
ts4990 electrical characteristics 9/31 figure 8. psrr vs. power supply figure 9. 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) figure 10. psrr vs. power supply figure 11. psrr vs. power supply 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) figure 12. psrr vs. power supply figure 13. psrr vs. power supply 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)
electrical characteristics ts4990 10/31 figure 14. psrr vs. dc output voltage figure 15. 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) figure 16. psrr vs. dc output voltage figure 17. psrr vs. dc output voltage -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) figure 18. psrr vs. dc output voltage figure 19. psrr vs. dc output voltage -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)
ts4990 electrical characteristics 11/31 figure 20. psrr vs. dc output voltage figure 21. psrr vs. dc output 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) figure 22. output power vs. power supply voltage figure 23. psrr vs. dc output voltage 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) figure 24. psrr at f = 217 hz vs. bypass capacitor figure 25. output power vs. power supply voltage 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)
electrical characteristics ts4990 12/31 figure 26. output power vs. power supply voltage figure 27. output power vs. load resistor 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 ( ) figure 28. output power vs. load resistor figure 29. output power vs. power supply voltage 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) figure 30. output power vs. load resistor figure 31. power dissipation vs. p out 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)
ts4990 electrical characteristics 13/31 figure 32. power dissipation vs. p out figure 33. power derating curves 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) figure 34. clipping voltage vs. power supply voltage and load resistor figure 35. power dissipation vs. p out 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) figure 36. clipping voltage vs. power supply voltage and load resistor figure 37. current consumption vs. power supply voltage 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)
electrical characteristics ts4990 14/31 figure 38. current consumption vs. standby voltage @ v cc = 5v figure 39. current consumption vs. standby voltage @ v cc = 2.6v 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) figure 40. thd + n vs. output power figure 41. current consumption vs. standby voltage @ v cc = 3.3v 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) figure 42. current consumption vs. standby voltage @ v cc = 2.2v figure 43. thd + n vs. output power 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)
ts4990 electrical characteristics 15/31 figure 44. thd + n vs. output power figure 45. 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) figure 46. thd + n vs. output power figure 47. thd + n vs. output power 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) 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 = 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)
electrical characteristics ts4990 16/31 figure 50. thd + n vs. output power figure 51. thd + n vs. frequency 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) figure 52. snr vs. power supply with unweighted filter (20hz to 20khz) figure 53. thd + n vs. frequency 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) figure 54. thd + n vs. frequency figure 55. snr vs. power supply with unweighted filter (20hz to 20khz) 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)
ts4990 electrical characteristics 17/31 figure 56. signal to noise ratio vs. power supply with a weighted filter figure 57. output noise voltage device on 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 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 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
application information ts4990 18/31 4 application information 4.1 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. 4.2 gain in a typical application the typical application schematics are shown in figure 1 on page 4 . 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 convenience 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 . 4.3 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. p out 2v out rms () 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 ------------------------------------ =
ts4990 application information 19/31 the graph in figure 60 shows an example of c in and c feed influence. figure 60. frequency response gain vs. c in & c feed 4.4 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 ). the load can be expressed as: and and therefore, the average current delivered by the supply voltage is: the power delivered by the supply voltage is: therefore, the power dissipated by each amplifier is: p diss = p supply - p out (w) 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) 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 supply v cc i cc avg (w) ? = p diss 22v cc r l ---------------------- p out p out ? =
application information ts4990 20/31 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 v peak = v cc , so: 4.5 decoupling of the circuit two capacitors are needed to correctly by pass 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 thd+n levels similar to th ose shown in the datasheet. in the high frequency region, if c s is lower than 1f, it incr eases 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. 4.6 wake-up time (t wu ) when the standby is released to put the device on, the bypass capacitor c b is not charged immediately. because 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 reac h this voltage is called wake-up time or t wu and specified in the electrical characteristics tables with c b =1f. if c b has a value other than 1f, refer to the graph in figure 60 on page 19 to establish the wake-up time. p diss p out ------------------ = 0 p diss max 2v cc 2 2 r l -------------- - (w) = = p out p supply ------------------- = v peak 4v cc ---------------------- - 4 ---- - = 78.5%
ts4990 application information 21/31 figure 61. typical wake-up time vs. c b due to process tolerances, the maximum value of wake-up time can be established by the graph in figure 62 . figure 62. maximum wake-up time vs. c b note: the bypass capacitor c b also has a typical tolerance of +/-20%. to calculate the wake-up time with this tolerance, refer to the graph above (considering for example for c b =1f in the range of 0.8f 1f 1.2f). 4.7 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. in shutdown mode, the bypass pin and v in pin are short-circuited to ground by internal switches. this allows a quick discharge of c b and c in capacitors. 4.8 pop performance pop performance is intimately linked with the size of the input capacitor c in and the bias voltage bypass capacitor c b . 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)
application information ts4990 22/31 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 & 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 figure 63 below. figure 63. in max. versus bypass capacitor by following the 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 =361nf. so, c in =390nf with standard value which gives a lower cut-of f frequency equal to 18.5 hz. in this case, (r in +2k )xc in = 9.36ms. by referring to the previous graph, if c b = 1 f and v cc =5v, we read 20 ms max. this value is twice as high as our current value, thus we can state that pop & 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. 4.9 application example: differen tial input, btl power amplifier the schematics in figure 64 show how to configure the ts4990 to work in differential input mode. the gain of the amplifier is: in order to reach the best performance of the differential function, r 1 and r 2 should be matched at 1% max. 1234 0 40 80 120 160 vcc=5v vcc=3.3v vcc=2.6v tamb=25 c in max. (ms) bypass capacitor cb ( f) g vdiff 2 r 2 r 1 ------ - =
ts4990 application information 23/31 figure 64. differential input amplifier configuration the input capacitor c in can 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 . example bill of materials the following bill of materials is for the example of a differential amplifier with a gain of 2 and a -3db lower cut-off frequency of about 80hz. 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 c in 1 2 r 1 f l -------------------- - (f) f cb 1 2 r 1 r 2 + () c b ---------------------------------------- (hz) = pin name function al description r 1 20k / 1% r 2 20k / 1% c in 100nf c b =c s 1f u1 ts4990
package information ts4990 24/31 5 package information in order to meet environmental requirements, stmicroelectronics offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an stmicroelectronics trademark. ecopack specifications are available at: www.st.com . 5.1 flip-chip package figure 65. flip-chip silhouette and pin-out (top view) figure 66. marking (top view) 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 balls are underneath xxx yww e xxx yww e st logo product and assembly code: xxx a90 from tours 90s from shenzhen three-digit datecode: yww e symbol for lead-free only the dot is for marking pin a1 symbol for lead-free version
ts4990 package information 25/31 figure 67. package mechanical data for 9-bump flip-chip figure 68. daisy chain mechanical data the daisy chain sample features two-by-two pin connections. the schematics above illustrate the way pins connect to each other. this sample is used to te st 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 an ohmmeter between pin a1 and pin a3, the soldering process continuity can be tested. 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: 50m 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 a c b 1 2 3 1.6mm 1.6mm a c b 1 2 3 1.6mm 1.6mm
package information ts4990 26/31 figure 69. ts4990 footprint recommendations figure 70. 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 size x + 70m die size y + 70m 4 1.5 4 all dimensions are in mm user direction of feed a 1 a 1 a 1 a 1 8 die size x + 70m die size y + 70m 4 1.5 4 all dimensions are in mm
ts4990 package information 27/31 5.2 miniso-8 package mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a 1.1 0.043 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 0.78 0.86 0.94 0.031 0.034 0.037 b 0.25 0.33 0.40 0.010 0.013 0.016 c 0.13 0.18 0.23 0.005 0.007 0.009 d 2.90 3.00 3.10 0.114 0.118 0.122 e 4.75 4.90 5.05 0.187 0.193 0.199 e1 2.90 3.00 3.10 0.114 0.118 0.122 e 0.65 0.026 k0606 l 0.40 0.55 0.70 0.016 0.022 0.028 l1 0.10 0.004
package information ts4990 28/31 5.3 dfn8 package mechanical data note: dfn8 exposed pad (e2 x d2) is connected to pin number 7. for enhanced thermal performance, the exposed pad must be soldered to a copper area on the pcb, acting as a heatsink. this copper area ca n be electrically connected to pin7 or left floating. ref. dimensions millimeters mils min. typ. max. min. typ. max. a 0.80 0.90 1.00 31.5 35.4 39.4 a1 0.02 0.05 0.8 2.0 a2 0.70 25.6 a3 0.20 7.9 b 0.18 0.23 0.30 7.1 9.1 11.8 d 2.875 3.00 3.125 118.1 d2 2.23 2. 2.48 87.8 90.7 97.7 e 2.875 3.00 3.125 118.1 e2 1.49 1.64 1.74 58.7 64.6 68.5 e 0.65 25.6 l 0.30 0.40 0.50 11.8 15.7 19.7
ts4990 package information 29/31 5.4 so-8 package mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a1.750.069 a1 0.10 0.25 0.004 0.010 a2 1.25 0.049 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 d 4.80 4.90 5.00 0.189 0.193 0.197 h 5.80 6.00 6.20 0.228 0.236 0.244 e1 3.80 3.90 4.00 0.150 0.154 0.157 e 1.27 0.050 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 k1818 ccc 0.10 0.004
ordering information ts4990 30/31 6 ordering information 7 revision history table 7. order codes part number temperature range package packing marking ts4990ijt ts4990eijt (1) 1. lead-free flip-chip part number. -40c, +85c flip-chip, 9 bumps tape & reel 90 tsdc05ijt tsdc05eijt (2) 2. lead free daisy chain part number. flip-chip, 9 bumps tape & reel dc3 ts4990ist miniso-8 tape & reel k990 ts4990iqt dfn8 tape & reel k990 ts4990ekijt fc + back coating tape & reel 90 ts4990id/idt so-8 tube or tape & reel ts4990i date revision changes jul-2002 1 first release. sep-2003 2 update mechanical data. oct-2004 3 order code for back coating on flip-chip. apr-2005 4 typography error on page 1: mini-so-8 pin connection. may-2005 5 new marking for assembly code plant. jul-2005 6 error on table 4 on page 5 . parameters in wrong column. sep-2005 7 updated mechanical coplanarity data to 50m (instead of 60m) (see figure 67 on page 25 ). mar-2006 8 so-8 package inserted in the datasheet. 21-jul-2006 9 update of figure 66 on page 24 . disclaimer update. 11-may-2007 10 corrected value of psrr in table 5 on page 6 from 1 to 61 (typical value). moved table 3: component descriptions to section 2: typical application schematics on page 4 . merged daisy chain flip-chip order code table into ta bl e 7 : o r d e r codes on page 30 .
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