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february 2007 rev 2 1/34 34 TS4997 2 x 1w differential input stereo audio amplifier with programmable 3d effects features operating range from v cc = 2.7v to 5.5v 1w output power per channel @ v cc =5v, thd+n=1%, r l =8 ultra low standby consumption: 10na typ. 80db psrr @ 217hz with grounded inputs high snr: 106db(a) typ. fast startup time: 45ms typ. pop&click-free circuit dedicated standby pin per channel lead-free qfn16 4x4mm package applications cellular mobile phones notebook and pda computers lcd monitors and tvs portable audio devices description the TS4997 is designed for top-class stereo audio applications. thanks to its compact and power-dissipation efficient qfn16 package with exposed pad, it suits a variety of applications. with a btl configuration, this audio power amplifier is capable of delivering 1w per channel of continuous rms output power into an 8 load @ 5v. 3d effects enhancement is programmed through a two digital input pin interface that allows more flexibility on each outp ut audio sound channel. each output channel (left and right), also has its own external controlled standby mode pin to reduce the supply current to less than 10na per channel. the device also features an internal thermal shutdown protection. the gain of each channel can be configured by external gain setting resistors. qfn16 4x4mm pin connections (top view) 56 78 16 15 14 13 12 11 10 9 1 2 3 4 lin- lin+ rin+ rin- lout+ lout- rout+ rout- byp vcc 3d1 3d0 gnd gnd stbyr stbyl 56 78 16 15 14 13 16 15 14 13 12 11 10 9 1 2 3 4 lin- lin+ rin+ rin- lout+ lout- rout+ rout- byp vcc 3d1 3d0 gnd gnd stbyr stbyl www.st.com
contents TS4997 2/34 contents 1 typical application sc hematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.1 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.2 differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.3 gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.4 common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.5 low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.6 3d effect enhancement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.7 power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.8 footprint recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.9 decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.10 standby control and wake-up time t wu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.11 shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.12 pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.13 single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.14 notes on psrr measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 5 qfn16 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 6 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
TS4997 typical application schematics 3/34 1 typical application schematics figure 1 shows a typical application for the TS4997 with a gain of +6db set by the input resistors. figure 1. typical application schematics table 1. external component descriptions components functi onal description r in input resistors that set the closed loop gain in conjunction with a fixed internal feedback resistor (gain = r feed /r in , where r feed = 50k ). c in input coupling capacitors that block th e dc voltage at the amplifier input terminal. thanks to common mode feedback, these input capacitors are optional. however, if they are added, they form with r in a 1st order high pass filter with -3db cut-off frequency (f cut-off = 1 / (2 x x r in x c in )). c s supply bypass capacitors that provides power supply filtering. c b bypass pin capacitor that pr ovides half supply filtering. cin1 330nf cb 1uf cs 1uf rin1 24k rin2 24k 1 2 4 3 16 15 13 5 6 14 12 11 9 10 8 7 bias stby 3d effect left righ t li n- rin- li n+ rin+ bypa ss gnd gnd lout- lout+ rout- rout+ - + + - stbyl stbyr 3d0 3d1 vcc TS4997 - qfn16 rin3 24k rin4 24k cin2 330nf cin3 330nf cin4 330nf vcc left speaker 8 ohms right speaker 8 ohms stbyl control stbyr control 3d0 control 3d1 control p1 dif f. input l- p2 dif f. input l+ p3 dif f. input r- p4 dif f. input r+ optional
absolute maximum ratings TS4997 4/34 2 absolute maximum ratings table 2. absolute maximum ratings 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 120 c/w p d power dissipation internally limited esd human body model (3) digital pins stbyl, stbyr, 3d0, 3d1 3. all voltage values are measured from each pin with respect to supplies. 2 1.5 kv esd machine model 200 v latch-up immunity 200 ma table 3. operating conditions symbol parameter value unit v cc supply voltage 2.7 to 5.5 v v icm common mode input voltage range gnd to v cc - 1v v v il 3d0 - 3d1 maximum low input voltage 0.4 v v ih 3d0 - 3d1 minimum high input voltage 1.3 v v stby standby voltage input: device on device off 1.3 v stby v cc gnd v stby 0.4 v r l load resistor 4 r out /gnd output resistor to gnd (v stby = gnd) 1m tsd thermal shutdown temperature 150 c r thja thermal resistance junction to ambient qfn16 (1) qfn16 (2) 1. when mounted on a 4-layer pcb with vias. 2. when mounted on a 2-layer pcb with vias. 45 85 c/w
TS4997 electrical characteristics 5/34 3 electrical characteristics table 4. 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, left and right channel active 7.4 9.6 ma i stby standby current (1) no input signal, v stbyl = gnd, v stbyr = gnd, r l = 8 10 2000 na v oo output offset voltage no input signal, r l = 8 135 mv p o output power thd = 1% max, f = 1khz, r l = 8 800 1000 mw thd + n total harmonic distortion + noise p o = 700mw rms , g = 6db, r l = 8 , 20hz f 20khz 0.5 % psrr power supply rejection ratio (2) , inputs grounded r l = 8 , g = 6db , c b = 1f, v ripple = 200mv pp , 3d effect off f = 217hz f = 1khz 80 75 db cmrr common mode rejection ratio (3) r l = 8 , g = 6db , c b = 1f, v incm = 200mv pp , 3d effect off f = 217hz f = 1khz 57 57 db snr signal-to-noise ratio a-weighted, g = 6db, c b = 1f, r l = 8 , 3d effect off (thd + n 0.5%, 20hz < f < 20khz) 108 db crosstalk channel separation, r l = 8 , g = 6db, 3d effect off f = 1khz f = 20hz to 20khz 105 80 db v n output voltage noise, f = 20hz to 20khz, r l = 8 , g=6db c b = 1f, 3d effect off unweighted a-weighted 15 10 vrms gain gain value (r in in k ) v/v t wu wake-up time (c b = 1f) 46 ms t stby standby time (c b = 1f) 10 s 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 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 sinusoidal si gnal superimposed upon v cc . 3. dynamic measurements - 20*log(rms(v out )/rms(v incm )). 40 k r in --------------- - 50 k r in --------------- - 60 k r in --------------- -
electrical characteristics TS4997 6/34 table 5. v cc = +3.3v, gnd = 0v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load, left and right channel active 6.6 8.6 ma i stby standby current (1) no input signal, v stbyl = gnd, v stbyr = gnd, r l = 8 10 2000 na v oo output offset voltage no input signal, r l = 8 135 mv p o output power thd = 1% max, f = 1khz, r l = 8 370 460 mw thd + n total harmonic distortion + noise p o = 300mw rms , g = 6db, r l = 8 , 20hz f 20khz 0.5 % psrr power supply rejection ratio (2) , inputs grounded r l = 8 , g = 6db , cb = 1f, v ripple = 200mv pp , 3d effect off f = 217hz f = 1khz 80 75 db cmrr common mode rejection ratio (3) r l = 8 , g = 6db , c b = 1f, v incm = 200mv pp , 3d effect off f = 217hz f = 1khz 57 57 db snr signal-to-noise ratio a-weighted, g = 6db, c b = 1f, rl = 8 , 3d effect off (thd + n 0.5%, 20hz < f < 20khz) 104 db crosstalk channel separation, r l = 8 , g = 6db, 3d effect off f = 1khz f = 20hz to 20khz 105 80 db v n output voltage noise, f = 20hz to 20khz, r l = 8 , g=6db c b = 1f, 3d effect off unweighted a-weighted 15 10 vrms gain gain value (r in in k ) v/v t wu wake-up time (c b = 1f) 47 ms t stby standby time (c b = 1f) 10 s 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 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 sinusoidal si gnal superimposed upon v cc . 3. dynamic measurements - 20*log(rms(v out )/rms(v incm )). 40 k r in --------------- - 50 k r in --------------- - 60 k r in --------------- -
TS4997 electrical characteristics 7/34 table 6. v cc = +2.7v, gnd = 0v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load, left and right channel active 6.2 8.1 ma i stby standby current (1) no input signal, v stbyl = gnd, v stbyr = gnd, r l = 8 10 2000 na v oo output offset voltage no input signal, r l = 8 135 mv p o output power thd = 1% max, f = 1khz, r l = 8 220 295 mw thd + n total harmonic distortion + noise p o = 200mw rms , g = 6db, r l = 8 , 20hz f 20khz 0.5 % psrr power supply rejection ratio (2) , inputs grounded r l = 8 , g = 6db , cb = 1f, v ripple = 200mv pp , 3d effect off f = 217hz f = 1khz 76 73 db cmrr common mode rejection ratio (3) r l = 8 , g = 6db , c b = 1f, v incm = 200mv pp , 3d effect off f = 217hz f = 1khz 57 57 db snr signal-to-noise ratio a-weighted, g = 6db, c b = 1f, rl = 8 , 3d effect off (thd + n 0.5%, 20hz < f < 20khz) 102 db crosstalk channel separation, r l = 8 , g = 6db, 3d effect off f = 1khz f = 20hz to 20khz 105 80 db v n output voltage noise, f = 20hz to 20khz, r l = 8 , g=6db c b = 1f, 3d effect off unweighted a-weighted 15 10 vrms gain gain value (r in in k ) v/v t wu wake-up time (c b = 1f) 46 ms t stby standby time (c b = 1f) 10 s 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 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 sinusoidal si gnal superimposed upon v cc . 3. dynamic measurements - 20*log(rms(v out )/rms(v incm )). 40 k r in --------------- - 50 k r in --------------- - 60 k r in --------------- -
electrical characteristics TS4997 8/34 table 7. index of graphics description figure page thd+n vs. output power figure 2 to 13 page 9 to page 10 thd+n vs. frequency figure 14 to 19 page 11 psrr vs. frequency figure 20 to 28 page 12 to page 13 psrr vs. common mode input voltage figure 29 page 13 cmrr vs. frequency figure 30 to 35 page 13 to page 14 cmrr vs. common mode input voltage figure 36 page 14 crosstalk vs. frequency figure 37 to 39 page 14 to page 15 snr vs. power supply voltage figure 40 to 45 page 15 to page 16 differential dc output voltage vs. common mode input voltage figure 46 to 48 page 16 current consumption vs. power supply voltage figure 49 page 16 current consumption vs. standby voltage figure 50 to 52 page 17 standby current vs. power supply voltage figure 53 page 17 frequency response figure 54 to 56 page 17 to page 18 output power vs. load resistance figure 57 page 18 output power vs. power supply voltage figure 58 to 59 page 18 power dissipation vs. output power figure 60 to 62 page 18 to page 19 power derating curves figure 63 page 19
TS4997 electrical characteristics 9/34 figure 2. thd+n vs. output power figure 3. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=2.7v vcc=3.3v vcc=5v rl = 4 g = +6db f = 1khz 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=2.7v vcc=3.3v vcc=5v rl = 4 g = +12db f = 1khz cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) figure 4. thd+n vs. output power figure 5. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=2.7v vcc=3.3v vcc=5v rl = 8 g = +6db f = 1khz 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=2.7v vcc=3.3v vcc=5v rl = 8 g = +12db f = 1khz cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) figure 6. thd+n vs. output power figure 7. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=2.7v vcc=3.3v vcc=5v rl = 16 g = +6db f = 1khz 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=2.7v vcc=3.3v vcc=5v rl = 16 g = +12db f = 1khz cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w)
electrical characteristics TS4997 10/34 figure 8. thd+n vs. output power figure 9. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=2.7v vcc=3.3v vcc=5v rl = 4 g = +6db f = 10khz 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=2.7v vcc=3.3v vcc=5v rl = 4 g = +12db f = 10khz cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) figure 10. thd+n vs. output power figure 11. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=2.7v vcc=3.3v vcc=5v rl = 8 g = +6db f = 10khz 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=2.7v vcc=3.3v vcc=5v rl = 8 g = +12db f = 10khz cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w) figure 12. thd+n vs. output power figure 13. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 vcc=2.7v vcc=3.3v vcc=5v rl = 16 g = +6db f = 10khz 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=2.7v vcc=3.3v vcc=5v rl = 16 g = +12db f = 10khz cb = 1 f bw < 125khz tamb = 25 c thd + n (%) output power (w)
TS4997 electrical characteristics 11/34 figure 14. thd+n vs. frequency figure 15. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 vcc=2.7v pout=260mw vcc=3.3v pout=430mw vcc=5v pout=950mw rl = 4 g = +6db cb = 1 f bw < 125khz tamb = 25 c thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 vcc=2.7v pout=260mw vcc=3.3v pout=430mw vcc=5v pout=950mw rl = 4 g = +12db cb = 1 f bw < 125khz tamb = 25 c thd + n (%) frequency (hz) figure 16. thd+n vs. frequency figure 17. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 vcc=2.7v pout=200mw vcc=3.3v pout=300mw vcc=5v pout=700mw rl = 8 g = +6db cb = 1 f bw < 125khz tamb = 25 c thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 vcc=2.7v pout=200mw vcc=3.3v pout=300mw vcc=5v pout=700mw rl = 8 g = +12db cb = 1 f bw < 125khz tamb = 25 c thd + n (%) frequency (hz) figure 18. thd+n vs. frequency figure 19. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 vcc=2.7v pout=120mw vcc=3.3v pout=200mw vcc=5v pout=450mw rl = 16 g = +6db cb = 1 f bw < 125khz tamb = 25 c thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 vcc=2.7v pout=120mw vcc=3.3v pout=200mw vcc=5v pout=450mw rl = 16 g = +12db cb = 1 f bw < 125khz tamb = 25 c thd + n (%) frequency (hz)
electrical characteristics TS4997 12/34 figure 20. psrr vs. frequency figure 21. psrr vs. frequency 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 5v vripple = 200mvpp g = +6db cb = 1 f, cin = 4.7 f inputs grounded tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 5v vripple = 200mvpp g = +12db cb = 1 f, cin = 4.7 f inputs grounded tamb = 25 c psrr (db) frequency (hz) figure 22. psrr vs. frequency figure 23. psrr vs. frequency 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 5v vripple = 200mvpp cb = 1 f inputs floating tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 3.3v vripple = 200mvpp g = +6db cb = 1 f, cin = 4.7 f inputs grounded tamb = 25 c psrr (db) frequency (hz) figure 24. psrr vs. frequency figure 25. psrr vs. frequency 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 3.3v vripple = 200mvpp g = +12db cb = 1 f, cin = 4.7 f inputs grounded tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 3.3v vripple = 200mvpp cb = 1 f inputs floating tamb = 25 c psrr (db) frequency (hz)
TS4997 electrical characteristics 13/34 figure 26. psrr vs. frequency figure 27. psrr vs. frequency 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 2.7v vripple = 200mvpp g = +6db cb = 1 f, cin = 4.7 f inputs grounded tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 2.7v vripple = 200mvpp g = +12db cb = 1 f, cin = 4.7 f inputs grounded tamb = 25 c psrr (db) frequency (hz) figure 28. psrr vs. frequency figure 29. psrr vs. common mode input voltage 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d off 3d low vcc = 2.7v vripple = 200mvpp cb = 1 f inputs floating tamb = 25 c psrr (db) frequency (hz) 012345 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3.3v vripple = 200mvpp f = 217hz, g = +6db cb = 1 f, rl 8 3d effect off tamb = 25c vcc=2.7v psrr (db) common mode input voltage (v) vcc=5v figure 30. cmrr vs. frequency figure 31. cmrr vs. frequency 100 1000 10000 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d low 3d off vcc = 5v rl 8 g = +6db vic = 200mvpp cb = 1 f, cin = 4.7 f tamb = 25c cmrr (db) frequency (hz) 100 1000 10000 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d low 3d off vcc = 5v rl 8 g = +12db vic = 200mvpp cb = 1 f, cin = 4.7 f tamb = 25c cmrr (db) frequency (hz)
electrical characteristics TS4997 14/34 figure 32. cmrr vs. frequency figure 33. cmrr vs. frequency 100 1000 10000 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d low 3d off vcc = 3.3v rl 8 g = +6db vic = 200mvpp cb = 1 f, cin = 4.7 f tamb = 25c cmrr (db) frequency (hz) 100 1000 10000 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d low 3d off vcc = 3.3v rl 8 g = +12db vic = 200mvpp cb = 1 f, cin = 4.7 f tamb = 25c cmrr (db) frequency (hz) figure 34. cmrr vs. frequency figure 35. cmrr vs. frequency 100 1000 10000 -70 -60 -50 -40 -30 -20 -10 0 3dhigh 3d medium 3d low 3d off vcc = 2.7v rl 8 g = +6db vic = 200mvpp cb = 1 f, cin = 4.7 f tamb = 25c cmrr (db) frequency (hz) 100 1000 10000 -70 -60 -50 -40 -30 -20 -10 0 3d high 3d medium 3d low 3d off vcc = 2.7v rl 8 g = +12db vic = 200mvpp cb = 1 f, cin = 4.7 f tamb = 25c cmrr (db) frequency (hz) figure 36. cmrr vs. common mode input voltage figure 37. crosstalk vs. frequency 012345 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 vcc=3.3v vripple = 200mvpp f = 217hz, g = +6db cb = 1 f, rl 8 3d effect off tamb = 25c vcc=2.7v cmrr (db) common mode input voltage (v) vcc=5v 100 1000 10000 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 crosstalk level (db) frequency (hz) rl = 4 g = +6db cin = 1 f, cb = 1 f 3d effect off tamb = 25 c vcc=5v vcc=3.3v vcc=2.7v
TS4997 electrical characteristics 15/34 figure 38. crosstalk vs. frequency figure 39. crosstalk vs. frequency 100 1000 10000 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 crosstalk level (db) frequency (hz) rl = 8 g = +6db cin = 1 f, cb = 1 f 3d effect off tamb = 25 c vcc=5v vcc=3.3v vcc=2.7v 100 1000 10000 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 crosstalk level (db) frequency (hz) rl = 16 g = +6db cin = 1 f, cb = 1 f 3d effect off tamb = 25 c vcc=5v vcc=3.3v vcc=2.7v figure 40. snr vs. power supply voltage figure 41. snr vs. power supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 5.5 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 3d high 3d medium 3d low 3d off a - weighted filter f = 1khz g = +6db, rl = 4 thd + n < 0.5% tamb = 25 c singnal to noise ratio (db) supply voltage (v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 3d high 3d middle 3d low 3d off a - weighted filter f = 1khz g = +6db ,rl = 8 thd + n < 0.5% tamb = 25 c singnal to noise ratio (db) supply voltage (v) figure 42. snr vs. power supply voltage figure 43. snr vs. power supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 5.5 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 3d high 3d middle 3d low 3d off a - weighted filter f = 1khz g = +6db ,rl = 16 thd + n < 0.5% tamb = 25 c singnal to noise ratio (db) supply voltage (v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 76 78 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 3d high 3d medium 3d low 3d off unweighted filter (20hz to 20khz) f = 1khz g = +6db, rl = 4 thd + n < 0.5% tamb = 25 c singnal to noise ratio (db) supply voltage (v)
electrical characteristics TS4997 16/34 figure 44. snr vs. power supply voltage figure 45. snr vs. power supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 5.5 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 3d high 3d medium 3d low 3d off unweighted filter (20hz to 20khz) f = 1khz g = +6db, rl = 8 thd + n < 0.5% tamb = 25 c singnal to noise ratio (db) supply voltage (v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 3d high 3d medium 3d low 3d off unweighted filter (20hz to 20khz) f = 1khz g = +6db, rl = 16 thd + n < 0.5% tamb = 25 c singnal to noise ratio (db) supply voltage (v) figure 46. differential dc output voltage vs. common mode input voltage figure 47. differential dc output voltage vs. common mode input voltage 012345 1e-3 0.01 0.1 1 10 100 1000 3d high 3d medium 3d low vcc = 5v g = +6db tamb = 25 c |voo| (mv) common mode input voltage (v) 3d off 0.0 0.5 1.0 1.5 2.0 2.5 3.0 1e-3 0.01 0.1 1 10 100 1000 3d high 3d medium 3d low vcc = 3.3v g = +6db tamb = 25 c |voo| (mv) common mode input voltage (v) 3d off figure 48. differential dc output voltage vs. common mode input voltage figure 49. current consumption vs. power supply voltage 0.0 0.5 1.0 1.5 2.0 2.5 1e-3 0.01 0.1 1 10 100 1000 3d high 3d medium 3d low vcc = 2.7v g = +6db tamb = 25 c |voo| (mv) common mode input voltage (v) 3d off 012345 0 1 2 3 4 5 6 7 8 one channel active no load tamb = 25 c current consumption (ma) power supply voltage (v) both channels active
TS4997 electrical characteristics 17/34 figure 50. current consumption vs. standby voltage figure 51. current consumption vs. standby voltage 012345 0 1 2 3 4 5 6 7 8 one channel active current consumption (ma) standby voltage (v) vcc = 5v no load tamb = 25 c both channels active 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 1 2 3 4 5 6 7 one channel active current consumption (ma) standby voltage (v) vcc = 3.3v no load tamb = 25 c both channels active figure 52. current consumption vs. standby voltage figure 53. standby current vs. power supply voltage 0.0 0.5 1.0 1.5 2.0 2.5 0 1 2 3 4 5 6 7 one channel active current consumption (ma) standby voltage (v) vcc = 2.7v no load tamb = 25 c both channels active 012345 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 standby current (na) power supply voltage (v) no load tamb = 25 c figure 54. frequency response figure 55. frequency response 100 1000 10000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 cin=680nf, rin=12k cin=4.7 f, rin=12k cin=4.7 f, rin=24k 20k gain (db) frequency (hz) cin=330nf, rin=24k vcc = 5v po = 700mw 3d effect off zl = 8 + 500pf tamb = 25 c 20 100 1000 10000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 cin=680nf, rin=12k cin=4.7 f, rin=12k cin=4.7 f, rin=24k 20k gain (db) frequency (hz) cin=330nf, rin=24k vcc = 3.3v po = 300mw 3d effect off zl = 8 + 500pf tamb = 25 c 20
electrical characteristics TS4997 18/34 figure 56. frequency response figure 57. output power vs. load resistance 100 1000 10000 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 cin=680nf, rin=12k cin=4.7 f, rin=12k cin=4.7 f, rin=24k 20k gain (db) frequency (hz) cin=330nf, rin=24k vcc = 2.7v po = 200mw 3d effect off zl = 8 + 500pf tamb = 25 c 20 4 8 12 16 20 24 28 32 0 200 400 600 800 1000 1200 1400 1600 1800 vcc=5.5v vcc=5v vcc=4.5v vcc=4v vcc=3.3v vcc=3v vcc=2.7v thd+n = 1% f = 1khz cb = 1 f bw < 125khz tamb = 25 c output power (mw) load resistance ( ) figure 58. output power vs. power supply voltage figure 59. output power vs. power supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 200 400 600 800 1000 1200 1400 1600 1800 rl=32 rl=8 rl=16 rl=4 f = 1khz cb = 1 f bw < 125 khz tamb = 25 c output power at 1% thd + n (mw) vcc (v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 rl=32 rl=8 rl=16 rl=4 f = 1khz cb = 1 f bw < 125 khz tamb = 25 c output power at 10% thd + n (mw) vcc (v) figure 60. power dissipation vs. output power figure 61. power dissipation vs. output power 0 200 400 600 800 1000 1200 1400 1600 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 rl=4 rl=16 rl=8 vcc = 5v f = 1khz thd+n < 1% power dissipation (mw) output power (mw) 0 100 200 300 400 500 600 700 0 50 100 150 200 250 300 350 400 450 500 550 600 rl=4 rl=16 rl=8 vcc = 3.3v f = 1khz thd+n < 1% power dissipation (mw) output power (mw)
TS4997 electrical characteristics 19/34 figure 62. power dissipation vs. output power figure 63. power derating curves 0 50 100 150 200 250 300 350 400 450 0 50 100 150 200 250 300 350 400 rl=4 rl=16 rl=8 vcc = 2.7v f = 1khz thd+n < 1% power dissipation (mw) output power (mw) 0 255075100125150 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 2.6 2.8 3.0 mounted on 2-layer pcb with vias no heat sink -amr value mounted on 4-layer pcb with vias qfn16 package power dissipation (w) ambiant temperature ( c) table 8. output noise, t amb = 25c conditions 3d effect level unweighted filter (20hz to 20khz) v cc = 2.7v to 5.5v a-weighted filter v cc = 2.7v to 5.5v inputs floating off 10 vrms 6 vrms inputs floating low 18 vrms 12 vrms inputs floating medium 24 vrms 15 vrms inputs floating high 34 vrms 22 vrms inputs grounded, g=6db off 15 vrms 10 vrms inputs grounded, g=6db low 28 vrms 19 vrms inputs grounded, g=6db medium 36 vrms 24 vrms inputs grounded, g=6db high 52 vrms 35 vrms inputs grounded, g=12db off 20 vrms 14 vrms inputs grounded, g=12db low 39 vrms 26 vrms inputs grounded, g=12db medium 50 vrms 33 vrms inputs grounded, g=12db high 71 vrms 48 vrms
application information TS4997 20/34 4 application information 4.1 general description the TS4997 integrates two monolithic full-differential input/output power amplifiers with two selectable standby pins dedicated for each channel. the gain of each channel is set by external input resistors. the TS4997 also features 3d effect enhancements that can be programmed through a two digital input pin interface that allows changing 3d effect levels in three steps. 4.2 differential configuration principle the TS4997 also includes a common mode feedback loop that controls the output bias value to average it at v cc /2 for any dc common mode input voltage. this allows maximum output voltage swing, and therefore, to maximize the output power. moreover, as the load is connected differentially instead of single-ended, output power 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 no pops&clicks without additional circuitry, giving a faster startup 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. in theory, the filtering of the internal bias by an external bypass capacitor is not necessary. however, to reach maximum performance in all tolerance situations, it is recommended to keep this option. the only constraint is that the differential f unction is directly linked to external resistor mismatching, therefore you must pay particular attention to this mismatching in order to obtain the best performance from the amplifier. 4.3 gain in typical application schematic a typical differential application is shown in figure 1 on page 3 . the value of the differential gain of each amplifier is dependent on the values of external input resistors r in1 to r in4 and of integrated feedback resistors with fixed value. in the flat region of the frequency-response curve (no c in effect), the differential gain of each channel is expressed by the relation given in equation 1 . equation 1 where r in = r in1 = r in2 = r in3 = r in4 expressed in k and r feed = 50k (value of internal feedback resistors). a v diff v o+ v o- ? diff input+ diff input- ? ------------------------------------------------------ r feed r in -------------- 50k r in ------------- - ===
TS4997 application information 21/34 due to the tolerance on the internal 50k feedback resistors, the differential gain will be in the range (no tolerance on r in ): the difference of resistance between input resistors of each channel have direct influence on the psrr, cmrr and other amplifier parameters. in order to reach maximum performance, we recommend matching the input resistors r in1 , r in2 , r in3 , and r in4 with a maximum tolerance of 1%. note: for the rest of this section, av diff will be called a v to simplify the mathematical expressions. 4.4 common mode feedback loop limitations as explained previously, the common mode feedback loop allows the output dc bias voltage to be averaged at v cc /2 for any dc common mode bias input voltage. due to the v icm limitation of the input stage (see table 3 on page 4 ), the common mode feedback loop can fulfil its role only within the defined range. this range depends upon the values of v cc , r in and r feed ( a v ). to have a good estimation of the v icm value, use the following formula: equation 2 with v cc in volts, r in in k and the result of the calculation must be in the range: due to the +/-20% tolerance on the 50k feedback resistors r feed (no tolerance on r in ), it is also important to check that the v icm remains in this range at the tolerance limits: if the result of the v icm calculation is not in this range, an input coupling capacitor must be used. example: v cc =2.7v, a v = 2, and v ic =2.2v. with internal resistors r feed = 50k , calculated external resistors are r in = r feed / a v = 25k , v cc = 2.7v and v ic = 2.2v, which gives v icm = 1.92v. taking into account the tolerance on the feedback resistors, with r feed = 40k the common mode input voltage is v icm =1.87v and with r feed = 60k , it is v icm =1.95v. these values are not in range from gnd to v cc - 1v = 1.7v, therefore input coupling capacitors are required. alternatively, you can change the v ic value. 40k r in ------------- - a v diff 60k r in ------------- - ? v icm v cc r in 2v ic r feed + 2r in r feed + () -------------------------------------------------------------------------- - v cc r in 2v ic 50k + 2r in 50k + () -------------------------------------------------------------------------- - v () == v ic diff input+ diff input- + 2 ------------------------------------------------------ - (v) = gnd v icm v cc 1v ? ? v cc r in 2v ic 40k + 2r in 40k + () -------------------------------------------------------------------------- v icm v cc r in 2v ic 60k + 2r in 60k + () -------------------------------------------------------------------------- v ()
application information TS4997 22/34 4.5 low frequency response the input coupling capacitors block the dc part of the input signal at the amplifier inputs. in the low frequency region, c in starts to have an effect. c in and r in form a first-order high pass filter with a -3db cut-off frequency. with r in expressed in and c in expressed in f. so, for a desired -3db cut-off frequency we can calculate c in : from figure 64 , you can easily establish the c in value required for a -3 db cut-off frequency for some typical cases. figure 64. -3db lower cut-off frequency vs. input capacitance 4.6 3d effect enhancement the TS4997 features 3d audio effect which can be programmed at three discrete levels (low, medium, high) through input pins 3d1 and 3d0 which provide a digital interface. the correspondence between the logic levels of this interface and 3d effect levels are shown in ta b l e 9 . the 3d audio effect applied to stereo audio signals evokes perception of spatial hearing and improves this effect in cases where the stereo speakers are too close to each other, such as in small handheld device s, or mobile equipment. the perceived amount of 3d effect is also dependent on many factors such as speaker position, distance between speakers and listener, frequency spectrum of audio signal, or difference of signal between left and right channel. in some cases, the volume can increase when switching on the 3d effect. this factor is dependent on the composition of the stereo audio signal and its frequency spectrum. f cl 1 2 r in c in ---------------------------------------------- - hz () = c in 1 2 r in f cl ----------------------------------------------- - f () = 0.2 0.4 0.6 0.8 1 10 100 rin=24k g~6db rin=12k g~12db rin=6.2k g~18db tamb=25 c low -3db cut off frequency (hz) input capacitor cin ( f) 0.1
TS4997 application information 23/34 4.7 power dissipation and efficiency assumptions: load voltage and current are sinusoidal (v out and i out ) supply voltage is a pure dc source (v cc ) the output voltage is: and and therefore, the average current delivered by the supply voltage is: equation 3 the power delivered by the supply voltage is: equation 4 p supply = v cc i ccavg (w) therefore, the power dissipated by each amplifier is: p diss = p supply - p out (w) table 9. 3d effect settings 3d effect level 3d0 3d1 off 00 low 01 medium 10 high 11 v out = v peak sin t (v) i out = v out r l ------------ - (a) p out = v peak 2 2r l -------------------- - (w) i ccavg = 2 v peak r l ---------------- - (a) p diss 22v cc r l ---------------------- p out p out w () ? =
application information TS4997 24/34 and the maximum value is obtained when: and its value is: equation 5 note: this maximum value is only dependent on the power supply voltage and load values. the efficiency is the ratio between the output power and the power supply: equation 6 the maximum theoretical value is reached when v peak = v cc , so: the TS4997 is stereo amplifier so it has two power amplifiers. each amplifier produces heat due to its power dissipation. therefore, the maximum die temperature is the sum of each amplifier?s maximum power dissipatio n. it is calculated as follows: p diss 1 = power dissipation of left channel power amplifier p diss 2 = power dissipation of right channel power amplifier to t a l p diss = p diss 1 + p diss 2 (w) in most cases, p diss 1 = p diss 2 , giving: the maximum die temperature allowable for the TS4997 is 150c. in case of overheating, a thermal shutdown protection set to 150c, puts the TS4997 in standby until the temperature of the die is reduced by about 5c. to calculate the maximum ambient temperature t amb allowable, you need to know: the power supply voltage value, v cc the load resistor value, r l the package type, r thja example: v cc =5v, r l =8 , r thja qfn16=85c/w (with 2-layer pcb with vias). using the power dissipation formula given in equation 5 , the maximum dissipated power per channel is: p dissmax = 633mw and the power dissipated by both channels is: to t a l p dissmax = 2 x p dissmax = 1266mw ? pdiss ? p out -------------------- - = 0 ) w ( r vcc 2 max pdiss l 2 2 = = p out p supply ------------------- = v peak 4vcc -------------------- = 4 ---- - = 78.5% totalp diss = 2 p diss1 42v cc r l ---------------------- p out 2p out w () ? =
TS4997 application information 25/34 t amb is calculated as follows: equation 7 therefore, the maximum allowable value for t amb is: t amb = 150 - 85 x 2 x 1.266=42.4c if a 4-layer pcb with vias is used, r thja qfn16 = 45c/w and the maximum allowable value for t amb in this case is: t amb = 150 - 45 x 2 x 1.266 = 93c 4.8 footprint recommendation footprint soldering pad dimensions are given in figure 72 on page 31 . as discussed in the previous section, the maximum allowable value for ambient temperature is dependent on the thermal resistance junction to ambient r thja . decreasing the r thja value causes better power dissipation. based on best thermal performance, it is recommended to use 4-layer pcbs with vias to effectively remove heat from the device. it is also recommended to use vias for 2-layer pcbs to connect the package exposed pad to heatsink cooper areas placed on another layer. for proper thermal conductivity, the vias must be plated through an d solder-filled. typical thermal vias have the following dimensions: 1.2mm pitch, 0.3mm diameter. figure 65. qfn16 footprint recommendation 4.9 decoupling of the circuit two capacitors are needed to correctly by pass the TS4997: a power supply bypass capacitor c s and a bias voltage bypass capacitor c b . t amb 150 cr tjha totalp dissmax ? =
application information TS4997 26/34 the c s capacitor has particular influence on the thd+n at high frequencies (above 7khz) and an indirect influence on power supply disturbances. with a value for c s of 1f, one can expect thd+n performance similar to that shown in the datasheet. in the high frequency region, if c s is lower than 1f, then thd+n increases and disturbances on the power supply rail are less filtered. on the other hand, if c s is greater than 1f, then those disturbances on the power supply rail are more filtered. the c b capacitor has an influence on the thd+n at lower frequencies, but also impacts psrr performance (with grounded input and in the lower frequency region). 4.10 standby control and wake-up time t wu the TS4997 has two dedicated standby pins (stbyl, stbyr). these pins allow to put each channel in standby mode or active mode independently. the amplifier is designed to reach close to zero pop when switching from one mode to the other. when both channels are in standby (v stbyl = v stbyr = gnd), the circuit is in shutdown mode. when at least one of the two standby pins is released to put the device on, the bypass capacitor c b starts to be charged. 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 reach this voltage is called the wake-up time or t wu and is specified in table 4 on page 5 , with c b =1f. during the wake-up phase, the TS4997 gain is close to zero. after the wake-up time, the gain is released and set to its nominal value. if c b has a value different from 1f, then refer to the graph in figure 66 to establish the corresponding wake-up time. when a channel is set to standby mode, the outputs of this channel are in high impedance state. figure 66. typical startup time vs. bypass capacitor 0.00.51.01.52.02.53.03.54.04.5 30 40 50 60 70 80 90 100 tamb=25 c vcc=2.7v vcc=3.3v vcc=5v startup time (ms) bypass capacitor cb ( f)
TS4997 application information 27/34 4.11 shutdown time when the standby command is activated (both channels put into standby mode), the time required to put the two output stages of each channel in high impedance and the internal circuitry in shutdown mode is a few microseconds. note: in shutdown mode when both channels are in standby, the bypass pin and l in +, l in -, r in +, r in - pins are shorted to ground by internal switches. this allows a quick discharge of c b and c in capacitors. 4.12 pop performance due to its fully differential structure, the pop performance of the TS4997 is close to perfect. however, due to mismatching between internal resistors r feed , external resistors r in and external input capacitors c in , some noise might remain at startup. to eliminate the effect of mismatched components, the TS4997 includes pop reduction circuitry. with this circuitry, the TS4997 is close to zero pop for all possible common applications. in addition, when the TS4997 is in standby mode, due to the high impedance output stage in this configuration, no pop is heard. 4.13 single-ended input configuration it is possible to use the TS4997 in a single-ended input configuration. however, input coupling capacitors are needed in this configuration. the schematic diagram in figure 67 shows an example of this configuration for a gain of +6db set by the input resistors.
application information TS4997 28/34 figure 67. typical single-ended input application the component calculations remain the same for the gain. in single-ended input configuration, the formula is: with r in expressed in k . 4.14 notes on psrr measurement what is the psrr? the psrr is the power supply rejection ratio. the psrr of a device is the ratio between a power supply disturbance and the result on the output. in other words, the psrr is the ability of a device to minimize the impact of power supply disturbance to the output. how is the psrr measured? the psrr is measured as shown in figure 68 . cin1 330nf cb 1uf cs 1uf 1 2 4 3 16 15 13 5 6 14 12 11 9 10 8 7 bias stby 3d effect left ri gh t li n- rin- li n+ rin+ bypa ss gnd gnd lout- lout+ rout- rout+ - + + - stbyl stbyr 3d0 3d1 vcc TS4997 - qfn16 cin2 330nf cin3 330nf cin4 330nf vcc left speaker 8 ohms right speaker 8 ohms stbyl control stbyr control 3d0 control 3d1 control p1 dif f. input l- p2 dif f. input r- rin1 24k rin2 24k rin3 24k rin4 24k av se = v o+ v o- ? v e -------------------------- r feed r in -------------- 50k r in ------------- - ==
TS4997 application information 29/34 figure 68. psrr measurement principles of operation the dc voltage supply (v cc ) is fixed the ac sinusoidal ripple voltage (v ripple ) is fixed no bypass capacitor c s is used the psrr value for each frequency is calculated as: rms is an rms selective measurement. cin1 4.7uf cb 1uf rin1 rin2 1 2 4 3 16 15 13 5 6 14 12 11 9 10 8 7 bias stby 3d effect left righ t li n- rin- li n+ rin+ bypa ss gnd gnd lout- lout+ rout- rout+ - + + - stbyl stbyr 3d0 3d1 vcc TS4997 - qfn16 rin3 rin4 cin2 4.7uf cin3 4.7uf cin4 4.7uf stbyl control stbyr control 3d0 control 3d1 control rl 8ohms rl 8ohms vcc vrip ple psrr 20 log rms output () rms vripple () ---------------------------------- db () =
qfn16 package information TS4997 30/34 5 qfn16 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 . figure 69. qfn16 package figure 70. pinout (top view) 56 78 16 15 14 13 12 11 10 9 1 2 3 4 lin- lin+ rin+ rin- lout+ lout- rout+ rout- byp vcc 3d1 3d0 gnd gnd stbyr stbyl 56 78 16 15 14 13 16 15 14 13 12 11 10 9 1 2 3 4 lin- lin+ rin+ rin- lout+ lout- rout+ rout- byp vcc 3d1 3d0 gnd gnd stbyr stbyl
TS4997 qfn16 package information 31/34 figure 71. qfn16 4x4mm figure 72. footprint soldering pad dimensions ref millimeters (mm) min typ max a 0.8 0.9 1.0 a1 0.02 0.05 a3 0.20 b 0.18 0.25 0.30 d 3.85 4.0 4.15 d2 2.1 2.6 e 3.85 4.0 4.15 e2 2.1 2.6 e 0.65 k 0.2 l 0.30 0.40 0.50 r 0.11 footprint data ref mm a 4.2 b 4.2 c 0.65 d 0.35 e 0.65 f 2.70 * the exposed pad is connected to ground. * * the exposed pad is connected to ground. *
ordering information TS4997 32/34 6 ordering information table 10. order codes part number temperature range package packaging marking TS4997iqt -40c, +85c qfn16 4x4mm tape & reel q997
TS4997 revision history 33/34 7 revision history date revision changes 10-jan-2007 1 preliminary data. 20-feb-2007 2 first release.
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