View TS4962IQT_8970723.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

january 2010 doc id 10968 rev 8 1/44 44 ts4962 2.8 w filter-free mono cla ss d audio power amplifier features operating from v cc = 2.4 v to 5.5 v standby mode active low output power: 2.8 w into 4 and 1.7 w into 8 with 10% thd+n maximum and 5 v power supply output power: 2.2 w at 5 v or 0.7 w at 3.0 v into 4 with 1% thd+n maximum output power: 1.4 w at 5 v or 0.5 w at 3.0 v into 8 with 1% thd+n maximum adjustable gain via external resistors low current consumption 2 ma at 3 v efficiency: 88% typical signal to noise ratio: 85 db typical psrr: 63 db typical at 217 hz with 6 db gain pwm base frequency: 280 khz low pop & click noise thermal shutdown protection available in dfn8 3 x 3 mm package applications cellular phones pdas notebook pcs description the ts4962 is a differential class-d btl power amplifier. it can drive up to 2.2 w into a 4 load and 1.4 w into an 8 load at 5 v. it achieves outstanding efficiency (88% typ.) compared to standard ab-class audio amps. the gain of the device can be controlled via two external gain setting resistors. pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5 ms. a standby function (active low) enables the current consumption to be reduced to 10 na typical. dfn8 3 x 3 mm TS4962IQT pinout 1 2 3 4 8 7 6 5 exposed pad 1 2 3 4 8 7 6 5 exposed pad www.st.com
contents ts4962 2/44 doc id 10968 rev 8 contents 1 absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 application overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.1 differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.2 gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.3 common-mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . 31 4.4 low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.5 decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.6 wake-up time (t wu ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.7 shutdown time (t stby ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.8 consumption in standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.9 single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 4.10 output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.11 several examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.11.1 example 1: dual differential inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.11.2 example 2: one differential input plus one single-ended input . . . . . . . . 36 5 demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 6 recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 8 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
ts4962 absolute maximum rati ngs and operating conditions doc id 10968 rev 8 3/44 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings symbol parameter value unit v cc supply voltage (1) (2) 1. caution: this device is not protected in the event of abnormal operating conditions such as short-circuiting between any one output pin and ground or between any one output pin and v cc , and between individual output pins. 2. all voltage values are measur ed with respect to the ground pin. 6v v i input voltage (3) 3. the magnitude of the input signal must never exceed v cc + 0.3 v/gnd - 0.3 v. 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 dfn8 package 120 c/w pd power dissipation internally limited (4) 4. exceeding the power derating curves during a long period will provoke abnormal operation. esd human body model (5) 5. human body model: a 100 pf capacit or is charged to the specified voltage, then discharged through a 1.5 k resistor between two pins of the device. this is done for all couples of connected pin combinations while the other pins are floating. 2kv machine model (6) 6. machine model: a 200 pf capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ). this is done for all couples of connected pin combinations whil e the other pins are floating. 200 v charged device model (7) 7. charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. th is is done for all pins. latch-up latch-up immunity 200 ma v stby standby pin maximum voltage (8) 8. the magnitude of the standby signal must never exceed v cc + 0.3 v/gnd - 0.3 v. gnd to v cc v lead temperature (soldering, 10sec) 260 c table 2. dissipation ratings package derating factor power rating at 25c power rating at 85c dfn8 20 mw/c 2.5 w 1.3 w
absolute maximum ratings and operating conditions ts4962 4/44 doc id 10968 rev 8 table 3. operating conditions symbol parameter value unit v cc supply voltage (1) 1. for v cc between 2.4 v and 2.5 v, the operating temperature range is reduced to 0c t amb 70c. 2.4 to 5.5 v v ic common mode input voltage range (2) 2. for v cc between 2.4v and 2.5v, the common mode input range must be set at v cc /2. 0.5 to v cc -0.8 v v stby standby voltage input: (3) device on device off 3. without any signal on v stby , the device will be in standby. 1.4 v stby v cc gnd v stby 0.4 (4) 4. minimum current consumption is obtained when v stby = gnd. v r l load resistor 4 r thja thermal resistance junction to ambient dfn8 package (5) 5. when mounted on a 4-layer pcb. 50 c/w
ts4962 application overview doc id 10968 rev 8 5/44 2 application overview table 4. external component information component functional description c s bypass supply capacitor. install as close as possible to the ts4962 to minimize high-frequency ripple. a 100 nf ceramic capacitor should be added to enhance the power supply f iltering at high frequencies. r in input resistor used to program the ts4962?s differential gain (gain = 300 k /r in with r in in k ). input capacitor because of common-mode feedback, thes e input capacitors are optional. however, they can be added to form with r in a 1st order high-pass filter with -3 db cut-off frequency = 1/(2* *r in *c in ). table 5. pin description pin number pin name description 1 stby standby input pin (active low) 2 nc no internal connection pin 3 in+ positive input pin 4 in- negative input pin 5 out+ positive output pin 6 vcc power supply input pin 7 gnd ground input pin 8 out- negative output pin exposed pad exposed pad can be connected to ground (pin 7) or left floating
application overview ts4962 6/44 doc id 10968 rev 8 figure 1. typical application schematics rin rin cs 1u gnd gnd gnd vcc vcc speaker capacitors input are optional + - differential input in+ gnd in- gnd in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k rin rin cs 1u gnd gnd gnd vcc vcc + - differential input capacitors input are optional in+ gnd in- gnd 2f 15h 15h load 4 ohms lc output filter 8 ohms lc output filter 2f gnd 1f 30h 30h 1f gnd in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k
ts4962 electrical characteristics doc id 10968 rev 8 7/44 3 electrical characteristics table 6. electrical characteristics at v cc = +5 v, with gnd = 0 v, v icm = 2.5 v, and t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 2.3 3.3 ma i stby standby current (1) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l = 8 325mv p out output power, g = 6 db thd = 1% max, f = 1 khz, r l = 4 thd = 10% max, f = 1 khz, r l = 4 thd = 1% max, f = 1 khz, r l = 8 thd = 10% max, f = 1 khz, r l = 8 2.2 2.8 1.4 1.7 w thd + n total harmonic distortion + noise p out = 850 mw rms , g = 6 db, 20 hz < f < 20 khz r l = 8 + 15 h, bw < 30 khz p out = 1 w rms , g = 6 db, f = 1 khz r l = 8 + 15 h, bw < 30 khz 2 0.4 % efficiency efficiency p out = 2 w rms , r l = 4 + 15 h p out =1.2 w rms , r l = 8 + 15 h 78 88 % psrr power supply rejection ratio with inputs grounded (2) f = 217 hz, r l = 8 , g=6db , v ripple = 200 mv pp 63 db cmrr common mode rejection ratio f = 217 hz, r l = 8 , g = 6 db, vic = 200 mv pp 57 db gain gain value (r in in k )v/v r stby internal resistance from standby to gnd 273 300 327 k f pwm pulse width modulator base frequency 200 280 360 khz snr signal to noise ratio (a weighting), p out = 1.2 w, r l = 8 85 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k r in ----------------- 300k r in ----------------- 327k r in -----------------
electrical characteristics ts4962 8/44 doc id 10968 rev 8 v n output voltage noise f = 20 hz to 20 khz, g = 6 db v rms unweighted r l = 4 a-weighted r l = 4 85 60 unweighted r l = 8 a-weighted r l = 8 86 62 unweighted r l = 4 + 15 h a-weighted r l = 4 + 15 h 83 60 unweighted r l = 4 + 30 h a-weighted r l = 4 + 30 h 88 64 unweighted r l = 8 + 30 h a-weighted r l = 8 + 30 h 78 57 unweighted r l = 4 + filter a-weighted r l = 4 + filter unweighted r l = 4 + filter a-weighted r l = 4 + filter 87 65 82 59 1. standby mode is active when v stby is tied to gnd. 2. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc at f = 217 hz. table 6. electrical characteristics at v cc = +5 v, with gnd = 0 v, v icm = 2.5 v, and t amb = 25c (unless otherwise specified) (continued) symbol parameter min. typ. max. unit
ts4962 electrical characteristics doc id 10968 rev 8 9/44 table 7. electrical characteristics at v cc = +4.2 v with gnd = 0 v, v icm = 2.1 v and t amb = 25c (unless otherwise specified) (1) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 2.1 3 ma i stby standby current (2) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l = 8 325mv p out output power, g = 6 db thd = 1% max, f = 1 khz, r l = 4 thd = 10% max, f = 1 khz, r l = 4 thd = 1% max, f = 1 khz, r l = 8 thd = 10% max, f = 1 khz, r l = 8 1.5 1.95 0.9 1.1 w thd + n total harmonic distortion + noise p out = 600 mw rms , g = 6 db, 20 hz < f < 20 khz r l = 8 + 15 h, bw < 30 khz p out = 700 mw rms , g = 6 db, f = 1 khz r l = 8 + 15 h, bw < 30 khz 2 0.35 % efficiency efficiency p out = 1.45 w rms , r l = 4 + 15 h p out = 0.9 w rms , r l = 8 + 15 h 78 88 % psrr power supply rejection ratio with inputs grounded (3) f = 217 hz, r l = 8 , g=6db , v ripple = 200 mv pp 63 db cmrr common mode rejection ratio f = 217 hz, r l = 8 , g = 6 db, vic = 200 mv pp 57 db gain gain value (r in in k )v/v r stby internal resistance from standby to gnd 273 300 327 k f pwm pulse width modulator base frequency 200 280 360 khz snr signal to noise ratio (a-weighting) p out = 0.8 w, r l = 8 85 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k r in ----------------- 300k r in ----------------- 327k r in -----------------
electrical characteristics ts4962 10/44 doc id 10968 rev 8 v n output voltage noise f = 20 hz to 20 khz, g = 6 db v rms unweighted r l = 4 a-weighted r l = 4 85 60 unweighted r l = 8 a-weighted r l = 8 86 62 unweighted r l = 4 + 15 h a-weighted r l = 4 + 15 h 83 60 unweighted r l = 4 + 30 h a-weighted r l = 4 + 30 h 88 64 unweighted r l = 8 + 30 h a-weighted r l = 8 + 30 h 78 57 unweighted r l = 4 + filter a-weighted r l = 4 + filter unweighted r l = 4 + filter a-weighted r l = 4 + filter 87 65 82 59 1. all electrical values ar e guaranteed with correlation measurements at 2.5 v and 5 v. 2. standby mode is active when v stby is tied to gnd. 3. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc at f = 217 hz. table 7. electrical characteristics at v cc = +4.2 v with gnd = 0 v, v icm = 2.1 v and t amb = 25c (unless otherwise specified) (1) (continued) symbol parameter min. typ. max. unit
ts4962 electrical characteristics doc id 10968 rev 8 11/44 table 8. electrical characteristics at v cc = +3.6 v with gnd = 0 v, v icm = 1.8 v, t amb = 25c (unless otherwise specified) (1) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 22.8ma i stby standby current (2) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l = 8 325mv p out output power, g = 6 db thd = 1% max, f = 1 khz, r l = 4 thd = 10% max, f = 1 khz, r l = 4 thd = 1% max, f = 1 khz, r l = 8 thd = 10% max, f = 1 khz, r l = 8 1.1 1.4 0.7 0.85 w thd + n total harmonic distortion + noise p out = 450 mw rms , g = 6 db, 20 hz < f < 20 khz r l = 8 + 15 h, bw < 30 khz p out = 500 mw rms , g = 6 db, f = 1 khz r l = 8 + 15 h, bw < 30 khz 2 0.1 % efficiency efficiency p out = 1 w rms , r l = 4 + 15 h p out = 0.65 w rms , r l = 8 + 15 h 78 88 % psrr power supply rejection ratio with inputs grounded (3) f = 217 hz, r l = 8 , g=6db , v ripple = 200 mv pp 62 db cmrr common mode rejection ratio f = 217 hz, r l = 8 , g = 6 db, vic = 200 mv pp 56 db gain gain value (r in in k )v/v r stby internal resistance from standby to gnd 273 300 327 k f pwm pulse width modulator base frequency 200 280 360 khz snr signal to noise ratio (a-weighting) p out = 0.6 w, r l = 8 83 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k r in ----------------- 300k r in ----------------- 327k r in -----------------
electrical characteristics ts4962 12/44 doc id 10968 rev 8 v n output voltage noise f = 20 hz to 20 khz, g = 6 db v rms unweighted r l = 4 a-weighted r l = 4 83 57 unweighted r l = 8 a-weighted r l = 8 83 61 unweighted r l = 4 + 15 h a-weighted r l = 4 + 15 h 81 58 unweighted r l = 4 + 30 h a-weighted r l = 4 + 30 h 87 62 unweighted r l = 8 + 30 h a-weighted r l = 8 + 30 h 77 56 unweighted r l = 4 + filter a-weighted r l = 4 + filter unweighted r l = 4 + filter a-weighted r l = 4 + filter 85 63 80 57 1. all electrical values ar e guaranteed with correlation measurements at 2.5 v and 5 v. 2. standby mode is activated when v stby is tied to gnd. 3. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc at f = 217 hz. table 8. electrical characteristics at v cc = +3.6 v with gnd = 0 v, v icm = 1.8 v, t amb = 25c (unless otherwise specified) (1) (continued) symbol parameter min. typ. max. unit
ts4962 electrical characteristics doc id 10968 rev 8 13/44 table 9. electrical characteristics at v cc = +3.0 v with gnd = 0 v, v icm = 1.5 v, t amb = 25c (unless otherwise specified) (1) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 1.9 2.7 ma i stby standby current (2) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l = 8 325mv p out output power, g = 6 db thd = 1% max, f = 1 khz, r l = 4 thd = 10% max, f = 1 khz, r l = 4 thd = 1% max, f = 1 khz, r l = 8 thd = 10% max, f = 1 khz, r l = 8 0.7 1 0.5 0.6 w thd + n total harmonic distortion + noise p out = 300 mw rms , g = 6 db, 20 hz < f < 20 khz r l = 8 + 15 h, bw < 30 khz p out = 350 mw rms , g = 6 db, f = 1 khz r l = 8 + 15 h, bw < 30 khz 2 0.1 % efficiency efficiency p out = 0.7 w rms , r l = 4 + 15 h p out = 0.45 w rms , r l = 8 + 15 h 78 88 % psrr power supply rejection ratio with inputs grounded (3) f = 217 hz, r l = 8 , g=6db , v ripple = 200 mv pp 60 db cmrr common mode rejection ratio f = 217 hz, r l = 8 , g = 6 db, v ic =200mv pp 54 db gain gain value (r in in k )v/v r stby internal resistance from standby to gnd 273 300 327 k f pwm pulse width modulator base frequency 200 280 360 khz snr signal to noise ratio (a-weighting) p out = 0.4 w, r l = 8 82 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k r in ----------------- 300k r in ----------------- 327k r in -----------------
electrical characteristics ts4962 14/44 doc id 10968 rev 8 v n output voltage noise f = 20 hz to 20 khz, g = 6 db v rms unweighted r l = 4 a-weighted r l = 4 83 57 unweighted r l = 8 a-weighted r l = 8 83 61 unweighted r l = 4 + 15 h a-weighted r l = 4 + 15 h 81 58 unweighted r l = 4 + 30 h a-weighted r l = 4 + 30 h 87 62 unweighted r l = 8 + 30 h a-weighted r l = 8 + 30 h 77 56 unweighted r l = 4 + filter a-weighted r l = 4 + filter unweighted r l = 4 + filter a-weighted r l = 4 + filter 85 63 80 57 1. all electrical values ar e guaranteed with correlation measurements at 2.5 v and 5 v. 2. standby mode is active when v stby is tied to gnd. 3. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc at f = 217 hz. table 9. electrical characteristics at v cc = +3.0 v with gnd = 0 v, v icm = 1.5 v, t amb = 25c (unless otherwise specified) (1) (continued) symbol parameter min. typ. max. unit
ts4962 electrical characteristics doc id 10968 rev 8 15/44 table 10. electrical characteristics at v cc = +2.5 v with gnd = 0 v, v icm = 1.25v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 1.7 2.4 ma i stby standby current (1) no input signal, v stby = gnd 10 1000 na v oo output offset voltage no input signal, r l = 8 325mv p out output power, g = 6 db thd = 1% max, f = 1 khz, r l = 4 thd = 10% max, f = 1 khz, r l = 4 thd = 1% max, f = 1 khz, r l = 8 thd = 10% max, f = 1 khz, r l = 8 0.5 0.65 0.33 0.41 w thd + n total harmonic distortion + noise p out = 180 mw rms , g = 6 db, 20 hz < f < 20 khz r l = 8 + 15 h, bw < 30 khz p out = 200 mw rms , g = 6 db, f = 1 khz r l = 8 + 15 h, bw < 30 khz 1 0.05 % efficiency efficiency p out = 0.47 w rms , r l = 4 + 15 h p out = 0.3 w rms , r l = 8 + 15 h 78 88 % psrr power supply rejection ratio with inputs grounded (2) f = 217 hz, r l = 8 , g = 6 db , v ripple = 200 mv pp 60 db cmrr common mode rejection ratio f = 217 hz, r l = 8 , g = 6 db, v ic = 200 mv pp 54 db gain gain value (r in in k )v/v r stby internal resistance from standby to gnd 273 300 327 k f pwm pulse width modulator base frequency 200 280 360 khz snr signal to noise ratio (a-weighting) p out = 0.3 w, r l = 8 80 db t wu wake-up time 5 10 ms t stby standby time 5 10 ms 273k r in ----------------- 300k r in ----------------- 327k r in -----------------
electrical characteristics ts4962 16/44 doc id 10968 rev 8 v n output voltage noise f = 20 hz to 20 khz, g = 6 db v rms unweighted r l = 4 a-weighted r l = 4 85 60 unweighted r l = 8 a-weighted r l = 8 86 62 unweighted r l = 4 + 15 h a-weighted r l = 4 + 15 h 76 56 unweighted r l = 4 + 30 h a-weighted r l = 4 + 30 h 82 60 unweighted r l = 8 + 30 h a-weighted r l = 8 + 30 h 67 53 unweighted r l = 4 + filter a-weighted r l = 4 + filter unweighted r l = 4 + filter a-weighted r l = 4 + filter 78 57 74 54 1. standby mode is active when v stby is tied to gnd. 2. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinusoidal signal to v cc at f = 217 hz. table 10. electrical characteristics at v cc = +2.5 v with gnd = 0 v, v icm = 1.25v, t amb = 25c (unless otherwise specified) (continued) symbol parameter min. typ. max. unit
ts4962 electrical characteristics doc id 10968 rev 8 17/44 table 11. electrical characteristics at v cc +2.4 v with gnd = 0 v, v icm = 1.2 v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load 1.7 ma i stby standby current (1) no input signal, v stby = gnd 10 na v oo output offset voltage no input signal, r l = 8 3mv p out output power, g = 6 db thd = 1% max, f = 1 khz, r l = 4 thd = 10% max, f = 1 khz, r l = 4 thd = 1% max, f = 1 khz, r l = 8 thd = 10% max, f = 1 khz, r l = 8 0.42 0.61 0.3 0.38 w thd + n total harmonic distortion + noise p out = 150 mw rms , g = 6 db, 20 hz < f < 20 khz r l = 8 + 15 h, bw < 30 khz 1% efficiency efficiency p out = 0.38 w rms , r l = 4 + 15 h p out = 0.25 w rms , r l = 8 + 15 h 77 86 % cmrr common mode rejection ratio f = 217 hz, r l = 8 , g = 6 db, v ic = 200 mv pp 54 db gain gain value (r in in k )v/v r stby internal resistance from standby to gnd 273 300 327 k f pwm pulse width modulator base frequency 280 khz snr signal to noise ratio (a-weighting) p out = 0.25 w, r l = 8 80 db t wu wake-up time 5 ms t stby standby time 5 ms 273k r in ----------------- 300k r in ----------------- 327k r in -----------------
electrical characteristics ts4962 18/44 doc id 10968 rev 8 v n output voltage noise f = 20 hz to 20 khz, g = 6 db v rms unweighted r l = 4 a-weighted r l = 4 85 60 unweighted r l = 8 a-weighted r l = 8 86 62 unweighted r l = 4 + 15 h a-weighted r l = 4 + 15 h 76 56 unweighted r l = 4 + 30 h a-weighted r l = 4 + 30 h 82 60 unweighted r l = 8 + 30 h a-weighted r l = 8 + 30 h 67 53 unweighted r l = 4 + filter a-weighted r l = 4 + filter unweighted r l = 4 + filter a-weighted r l = 4 + filter 78 57 74 54 1. standby mode is active when v stby is tied to gnd. table 11. electrical characteristics at v cc +2.4 v with gnd = 0 v, v icm = 1.2 v, t amb = 25c (unless otherwise specified) (continued) symbol parameter min. typ. max. unit
ts4962 electrical characteristics doc id 10968 rev 8 19/44 3.1 electrical characteristics curves the graphs shown in this section use the following abbreviations. r l + 15 h or 30 h = pure resistor + very low series resistance inductor filter = lc output filter (1 f + 30 h for 4 and 0. 5f + 60 h for 8 ) all measurements are done with c s1 = 1 f and c s2 = 100 nf (see figure 2 ), except for the psrr where c s1 is removed (see figure 3 ). figure 2. schematic used for test measurements figure 3. schematic used for pssr measurements in+ in- rin 150k rin 150k cin cin gnd vcc + cs1 1uf gnd cs2 100nf gnd rl 4 or 8 ohms 15uh or 30uh or lc filter 5th order 50khz low pass filter audio measurement bandwidth < 30khz out+ out- ts4962 in+ in- rin 150k rin 150k 4.7uf 4.7uf gnd cs2 100nf gnd rl 4 or 8 ohms 15uh or 30uh or lc filter 5th order 50khz low pass filter rms selective measurement bandwidth=1% of fmeas out+ out- ts4962 gnd 5th order 50khz low pass filter reference 20hz to 20khz vcc gnd
electrical characteristics ts4962 20/44 doc id 10968 rev 8 figure 4. current consumption vs. power supply voltage figure 5. current consumption vs. standby voltage 012345 0.0 0.5 1.0 1.5 2.0 2.5 no load tamb=25 c current consumption (ma) power supply voltage (v) 012345 0.0 0.5 1.0 1.5 2.0 2.5 vcc = 5v no load tamb=25 c current consumption (ma) standby voltage (v) figure 6. current consumption vs. standby voltage figure 7. output offset voltage vs. common mode input voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 vcc = 3v no load tamb=25 c current consumption (ma) standby voltage (v) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 2 4 6 8 10 vcc=3.6v vcc=2.5v vcc=5v g = 6db tamb = 25 c voo (mv) common mode input voltage (v) figure 8. efficiency vs. output power figure 9. efficiency vs. output power 0.0 0.5 1.0 1.5 2.0 0 20 40 60 80 100 0 100 200 300 400 500 600 vcc=5v rl=4 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) 2.2 power dissipation (mw) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 20 40 60 80 100 0 50 100 150 200 vcc=3v rl=4 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw)
ts4962 electrical characteristics doc id 10968 rev 8 21/44 figure 10. efficiency vs. output power figure 11. efficiency vs. output power 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 20 40 60 80 100 0 50 100 150 vcc=5v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) 0.0 0.1 0.2 0.3 0.4 0.5 0 20 40 60 80 100 0 25 50 75 vcc=3v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) figure 12. output power vs. power supply voltage figure 13. output power vs. power supply voltage 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 thd+n=10% rl = 4 + 15 h f = 1khz bw < 30khz tamb = 25 c thd+n=1% output power (w) vcc (v) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.5 1.0 1.5 2.0 thd+n=10% rl = 8 + 15 h f = 1khz bw < 30khz tamb = 25 c thd+n=1% output power (w) vcc (v) figure 14. psrr vs. frequency figure 15. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v, 3.6v, 2.5v 20k 20 vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 4 + 15 h r/r 0.1% tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v, 3.6v, 2.5v 20k 20 vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 4 + 30 h r/r 0.1% tamb = 25 c psrr (db) frequency (hz)
electrical characteristics ts4962 22/44 doc id 10968 rev 8 figure 16. psrr vs. frequency figure 17. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v, 3.6v, 2.5v 20k 20 vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 4 + filter r/r 0.1% tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v, 3.6v, 2.5v 20k 20 vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 8 + 15 h r/r 0.1% tamb = 25 c psrr (db) frequency (hz) figure 18. psrr vs. frequency figure 19. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v, 3.6v, 2.5v 20k 20 vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 8 + 30 h r/r 0.1% tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=5v, 3.6v, 2.5v 20k 20 vripple = 200mvpp inputs = grounded g = 6db, cin = 4.7 f rl = 8 + filter r/r 0.1% tamb = 25 c psrr (db) frequency (hz) figure 20. psrr vs. common mode input voltage figure 21. cmrr vs. frequency 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -80 -70 -60 -50 -40 -30 -20 -10 0 vcc=3.6v vcc=2.5v vcc=5v vripple = 200mvpp f = 217hz, g = 6db rl 4 + 15 h tamb = 25 c psrr(db) common mode input voltage (v) 100 1000 10000 -60 -40 -20 0 vcc=5v, 3.6v, 2.5v rl=4 + 15 h g=6db vicm=200mvpp r/r 0.1% cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz)
ts4962 electrical characteristics doc id 10968 rev 8 23/44 figure 22. cmrr vs. frequency figure 23. cmrr vs. frequency 100 1000 10000 -60 -40 -20 0 vcc=5v, 3.6v, 2.5v rl=4 + 30 h g=6db vicm=200mvpp r/r 0.1% cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) 100 1000 10000 -60 -40 -20 0 vcc=5v, 3.6v, 2.5v rl=4 + filter g=6db vicm=200mvpp r/r 0.1% cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) figure 24. cmrr vs. frequency figure 25. cmrr vs. frequency 100 1000 10000 -60 -40 -20 0 vcc=5v, 3.6v, 2.5v rl=8 + 15 h g=6db vicm=200mvpp r/r 0.1% cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) 100 1000 10000 -60 -40 -20 0 vcc=5v, 3.6v, 2.5v rl=8 + 30 h g=6db vicm=200mvpp r/r 0.1% cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) figure 26. cmrr vs. frequency figure 27. cmrr vs. common mode input voltage 100 1000 10000 -60 -40 -20 0 vcc=5v, 3.6v, 2.5v rl=8 + filter g=6db vicm=200mvpp r/r 0.1% cin=4.7 f tamb = 25 c 20k 20 cmrr (db) frequency (hz) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -70 -60 -50 -40 -30 -20 vcc=3.6v vcc=2.5v vcc=5v vicm = 200mvpp f = 217hz g = 6db rl 4 + 15 h tamb = 25 c cmrr(db) common mode input voltage (v)
electrical characteristics ts4962 24/44 doc id 10968 rev 8 figure 28. thd+n vs. output power figure 29. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 3 vcc=3.6v vcc=5v vcc=2.5v rl = 4 + 15 h f = 100hz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.01 0.1 1 10 3 vcc=3.6v vcc=5v vcc=2.5v rl = 4 + 30 h or filter f = 100hz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 30. thd+n vs. output power figure 31. thd+n vs. output power 1e-3 0.01 0.1 1 0.01 0.1 1 10 2 vcc=5v vcc=2.5v vcc=3.6v rl = 8 + 15 h f = 100hz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.01 0.1 1 10 2 vcc=5v vcc=2.5v vcc=3.6v rl = 8 + 30 h or filter f = 100hz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 32. thd+n vs. output power figure 33. thd+n vs. output power 1e-3 0.01 0.1 1 0.1 1 10 3 vcc=3.6v vcc=5v vcc=2.5v rl = 4 + 15 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 3 vcc=3.6v vcc=5v vcc=2.5v rl = 4 + 30 h or filter f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w)
ts4962 electrical characteristics doc id 10968 rev 8 25/44 figure 34. thd+n vs. output power figure 35. thd+n vs. output power 1e-3 0.01 0.1 1 0.1 1 10 2 vcc=5v vcc=2.5v vcc=3.6v rl = 8 + 15 h f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) 1e-3 0.01 0.1 1 0.1 1 10 2 vcc=5v vcc=2.5v vcc=3.6v rl = 8 + 30 h or filter f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 36. thd+n vs. frequency figure 37. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 po=0.7w po=1.4w rl=4 + 15 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.7w po=1.4w rl=4 + 30 h or filter g=6db bw < 30khz vcc=5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) figure 38. thd+n vs. frequency figure 39. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 po=0.42w po=0.85w rl=4 + 15 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 50 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.42w po=0.85w rl=4 + 30 h or filter g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 50 thd + n (%) frequency (hz)
electrical characteristics ts4962 26/44 doc id 10968 rev 8 figure 40. thd+n vs. frequency figure 41. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 po=0.17w po=0.35w rl=4 + 15 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.17w po=0.35w rl=4 + 30 h or filter g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) figure 42. thd+n vs. frequency figure 43. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 po=0.42w po=0.85w rl=8 + 15 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.42w po=0.85w rl=8 + 30 h or filter g=6db bw < 30khz vcc=5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) figure 44. thd+n vs. frequency figure 45. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 po=0.22w po=0.45w rl=8 + 15 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 50 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.22w po=0.45w rl=8 + 30 h or filter g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 50 thd + n (%) frequency (hz)
ts4962 electrical characteristics doc id 10968 rev 8 27/44 figure 46. thd+n vs. frequency figure 47. thd+n vs. frequency 100 1000 10000 0.01 0.1 1 10 po=0.1w po=0.18w rl=8 + 15 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.1w po=0.18w rl=8 + 30 h or filter g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 50 thd + n (%) frequency (hz) figure 48. gain vs. frequency figure 49. gain vs. frequency 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=4 + 15 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=4 + 30 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) figure 50. gain vs. frequency figure 51. gain vs. frequency 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=4 + filter g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=8 + 15 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz)
electrical characteristics ts4962 28/44 doc id 10968 rev 8 figure 52. gain vs. frequency figure 53. gain vs. frequency 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=8 + 30 h g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=8 + filter g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) figure 54. gain vs. frequency figure 55. startup and shutdown times v cc =5v, g=6db, c in = 1f (5ms/div) 100 1000 10000 0 2 4 6 8 vcc=5v, 3.6v, 2.5v rl=no load g=6db vin=500mvpp cin=1 f tamb = 25 c 20k 20 differential gain (db) frequency (hz) vo1 vo2 vo1-vo2 standby figure 56. startup and shutdown times v cc = 3v, g = 6db, c in = 1f (5ms/div) figure 57. startup and shutdown times v cc = 5v, g = 6db, c in = 100nf (5ms/div) vo1 vo2 vo1-vo2 standby vo1 vo2 vo1-vo2 standby
ts4962 electrical characteristics doc id 10968 rev 8 29/44 figure 58. startup and shutdown times v cc = 3v, g = 6db, c in = 100nf (5ms/div) figure 59. startup and shutdown times v cc = 5v, g = 6db, no c in (5ms/div) figure 60. startup and shutdown times v cc = 3v, g = 6db, no c in (5ms/div) vo1 vo2 vo1-vo2 standby vo1 vo2 vo1-vo2 standby vo1 vo2 vo1-vo2 standby
application information ts4962 30/44 doc id 10968 rev 8 4 application information 4.1 differential configuration principle the ts4962 is a monolithic, fully differential input/output class d power amplifier. the ts4962 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 the device to always have a maximum output voltage swing, and by consequence, maximize the output power. moreover, as the load is connected differentially compared to a single-ended topology, the output is four times higher for the same power supply voltage. the advantages of a fully differential amplifier are: high psrr (power supply rejection ratio). high common mode noise rejection. virtually zero pop without additional circuitry, giving a faster start-up time compared to conventional single-ended input amplifiers. easier interfacing with differential output audio dac. no input coupling capacitors required because of common-mode feedback loop. the main disadvantage is that, since the differential function is directly linked to the external resistor mismatching, particular attention should be paid to this mismatching in order to obtain the best performance from the amplifier. 4.2 gain in typical application schematic typical differential applications are shown in figure 1 on page 6 . in the flat region of the frequency-response curve (no input coupling capacitor effect), the differential gain is expressed by the relation: with r in expressed in k . due to the tolerance of the internal 150 k feedback resistor, the differential gain is in the range (no tolerance on r in ): a v diff out + out - ? in + in - ? ------------------------------- 300 r in --------- - == 273 r in --------- - a v diff 327 r in --------- - ?
ts4962 application information doc id 10968 rev 8 31/44 4.3 common-mode feedba ck loop limitations as explained previously, the common-mode fe edback loop allows the output dc bias voltage to be averaged at v cc /2 for any dc common-mode bias input voltage. however, due to a v icm limitation in the input stage (see table 3: operating conditions on page 4 ), the common-mode feedback loop can play its role only within a defined range. this range depends upon the values of v cc and r in (a vdiff ). to have a good estimation of the v icm value, we can apply this formula (no tolerance on r in ): with and the result of the calculation must be in the range: due to the +/-9% tolerance on the 150 k resistor, it is also important to check v icm in these conditions. if the result of the v icm calculation is not in the previous range, input coupling capacitors must be used. with v cc between 2.4 and 2.5 v, input coupling capacitors are mandatory. for example: with v cc =3v, r in = 150 k and v ic = 2.5 v, we typically find v icm = 2 v, which is lower than 3 v-0.8 v = 2.2 v. with 136.5 k we find 1.97 v and with 163.5 k we have 2.02 v. therefore, no input coupling capacitors are required. 4.4 low frequency response if a low frequency bandwidth limitation is requested, it is possible to use input coupling capacitors. in the low frequency region, c in (input coupling capacitor) starts to have an effect. c in forms, with r in , a first order high-pass filter with a -3 db cut-off frequency. so, for a desired cut-off frequency we can calculate c in , with r in in and f cl in hz. v icm v cc r in 2v ic 150k + 2r in 150k + () ----------------------------------------------------------------------------- - (v) = v ic in + in - + 2 --------------------- (v) = 0.5v v icm v cc 0.8v ? ? v cc r in 2v ic 136.5k + 2r in 136.5k + () ---------------------------------------------------------------------------------- - v icm v cc r in 2v ic 163.5k + 2r in 163.5k + () ---------------------------------------------------------------------------------- - ? f cl 1 2 r in c in -------------------------------------- (hz) = c in 1 2 r in f cl --------------------------------------- - (f) =
application information ts4962 32/44 doc id 10968 rev 8 4.5 decoupling of the circuit a power supply capacitor, referred to as c s , is needed to correctly bypass the ts4962. the ts4962 has a typical switching frequency at 250 khz and output fall and rise time about 5 ns. due to these very fast transients, careful decoupling is mandatory. a 1 f ceramic capacitor is enough, but it must be located very close to the ts4962 in order to avoid any extra parasitic inductance being created by an overly long track wire. in relation with di/dt, this parasitic inductance introduces an overvoltage that decreases the global efficiency and, if it is too high, may cause a breakdown of the device. in addition, even if a ceramic capacitor has an adequate high frequency esr value, its current capability is also important. a 0603 si ze is a good compromise, particularly when a 4 load is used. another important parameter is the rated voltage of the capacitor. a 1 f/6.3 v capacitor used at 5 v loses about 50% of its value. in fact, with a 5 v power supply voltage, the decoupling value is about 0.5 f instead of 1 f. as c s has particular influence on the thd+n in the medium-high frequency region, this capacitor variation becomes decisive. in addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply amr value (6 v). 4.6 wake-up time (t wu ) when the standby is released to set the device on, there is a wait of about 5 ms. the ts4962 has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise. 4.7 shutdown time (t stby ) when the standby command is set, the time required to put the two output stages into high impedance and to put the internal circuitry in st andby mode is about 5 ms. this time is used to decrease the gain and avoid any pop noise during the shutdown phase. 4.8 consumption in standby mode between the standby pin and gnd there is an internal 300 k resistor. this resistor forces the ts4962 to be in standby mode when the standby input pin is left floating. however, this resistor also introduces additional power consumption if the standby pin voltage is not 0 v. for example, with a 0.4 v standby voltage pin, table 3 on page 4 shows that you must add 0.4 v/300 k = 1.3 a typical (0.4 v/273 k = 1.46 a maximum) to the standby current specified in table 5 on page 5 .
ts4962 application information doc id 10968 rev 8 33/44 4.9 single-ended input configuration it is possible to use the ts4962 in a single-ended input configuration. however, input coupling capacitors are needed in this configuration. figure 61 shows a typical single-ended input application. figure 61. single-ended input typical application all formulas are identical except for the gain with r in in k . due to the internal resistor tolerance we have: in the event that multiple single-ended inputs are summed, it is important that the impedance on both ts4962 inputs (in - and in + ) be equal. figure 62. typical application schema tic with multiple single-ended inputs rin rin cs 1u gnd gnd vcc speaker cin cin ve gnd gnd standby in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k a v gle sin v e out + out - ? ------------------------------- 300 r in --------- - == 273 r in --------- - a v gle sin 327 r in --------- - ? rin1 req cs 1u gnd gnd vcc speaker cin1 ceq ve1 gnd gnd standby rink cink vek gnd in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k
application information ts4962 34/44 doc id 10968 rev 8 we have the following equations. in general, for mixed situations (single-ended and differential inputs) it is best to use the same rule, that is, equalize impedance on both ts4962 inputs. 4.10 output filter considerations the ts4962 is designed to operate without an output filter. however, due to very sharp transients on the ts4962 output, emi-radiated emissions may cause some standard compliance issues. these emi standard compliance issues can appear if the distance between the ts4962 outputs and the loudspeaker terminal is long (typically more than 50 mm, or 100 mm in both directions, to the speaker terminals). as the pcb layout and internal equipment device are different for each configuration, it is difficult to provide a one-size-fits-all solution. however, to decrease the prob ability of emi issues, there are several simple rules to follow. reduce, as much as possible, the distance between the ts4962 output pins and the speaker terminals. use ground planes for "shielding" sensitive wires. place, as close as possible to the ts4962 and in series with each output, a ferrite bead with a rated current of at least 2.5 a and an impedance greater than 50 at frequencies above 30 mhz. if, after testing, these ferrite beads are not necessary, replace them by a short-circuit. allow enough footprint to place, if necessary, a capacitor to short perturbations to ground (see figure 63 ). figure 63. method for shorting perturbations to ground out + out - ? v e1 300 r in1 ------------ - v ek 300 r ink ------------ - (v) ++ = c eq k j1 = c in i = c in i 1 2 r ini f cl i ------------------------------------------------------- ( f ) = r eq 1 1 r ini ---------- j1 = k ------------------- = ferrite chip bead about 100pf gnd from ts4962 output to speaker
ts4962 application information doc id 10968 rev 8 35/44 in the case where the distance between the ts4962 output and the speaker terminals is high, it is possible to observe low frequency emi issues due to the fact that the typical operating frequency is 250 khz. in this confi guration, we recommend using an output filter (as represented in figure 1 on page 6 ). it should be placed as close as possible to the device. 4.11 several examples with summed inputs 4.11.1 example 1: dual differential inputs figure 64. typical application schematic with dual differential inputs with (r i in k ): r1 r1 cs 1u gnd gnd vcc speaker standby r2 r2 e1+ e1- e2- e2+ in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k a v 1 out + out - ? e 1 + e 1 - ? ------------------------------- 300 r 1 --------- - == a v 2 out + out - ? e 2 + e 2 - ? ------------------------------- 300 r 2 --------- - == 0.5v v cc r 1 r 2 300 v ic1 r 2 v ic2 + r 1 () + 300 r 1 r 2 + () 2r 1 r 2 + ------------------------------------------------------------------------------------------------------------------------------- - v cc 0.8v ? ? v ic 1 e 1 + e 1 - + 2 ------------------------ = and v ic 2 e 2 + e 2 - + 2 ------------------------ =
application information ts4962 36/44 doc id 10968 rev 8 4.11.2 example 2: one differentia l input plus one single-ended input figure 65. typical application schemati c with one differential input and one single-ended input with (r i in k ) : r1 r2 cs 1u gnd gnd vcc speaker standby r2 r1 e1+ e2- e2+ c1 c1 gnd in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k a v 1 out + out - ? e 1 + ------------------------------- 300 r 1 --------- - == a v 2 out + out - ? e 2 + e 2 - ? ------------------------------- 300 r 2 --------- - == c 1 1 2 r 1 f cl -------------------------------------- (f) =
ts4962 demonstration board doc id 10968 rev 8 37/44 5 demonstration board a demonstration board for the ts4962 is available. for more information about this demonstration board, refer to the application note an2406 "ts4962iq class d audio amplifier evaluation board user guidelines" available on www.st.com . figure 66. schematic diagram of mono class d demonstration board for the ts4962 dfn package figure 67. top view c1 100nf c2 100nf gnd vcc vcc gnd gnd c3 1uf gnd r1 150k r2 150k in- stdby in+ out- out+ vcc 1 4 3 7 8 6 5 gnd internal bias pwm output bridge h oscillator 150k 150k + - 300k u1 ts4962dfn 1 2 3 cn1 input cn2 cn3 1 2 3 cn4 cn5 speaker cn6 gnd positive input negative input positive output negative output
demonstration board ts4962 38/44 doc id 10968 rev 8 figure 68. bottom layer figure 69. top layer
ts4962 recommended footprint doc id 10968 rev 8 39/44 6 recommended footprint figure 70. recommended footprint for ts4962 dfn package 1.4mm 1.8mm 0.8mm 0.35mm 0.65mm 2.2mm
package information ts4962 40/44 doc id 10968 rev 8 7 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
ts4962 package information doc id 10968 rev 8 41/44 figure 71. dfn8 3 x 3 exposed pad package mechanical drawing (pitch 0.65 mm) table 12. dfn8 3 x 3 exposed pad package mechanical data (pitch 0.65 mm) note: 1 the pin 1 identifier must be visible on the top surface of the package by using an indentation mark or other feature of the package body. exact shape and size of this feature are optional. 2 the dimension l does not conform with jedec mo-248, which recommends 0.40+/-0.10 mm. for enhanced thermal performance, the exposed pad must be soldered to a copper area on the pcb, acting as a heatsink. this copper area can be electrically connected to pin 7 or left floating. ref. dimensions millimeters inches min. typ. max. min. typ. max. a 0.50 0.60 0.65 0.020 0.024 0.026 a1 0.02 0.05 0.0008 0.002 a3 0.22 0.009 b 0.25 0.30 0.35 0.010 0.012 0.014 d 2.85 3.00 3.15 0.112 0.118 0.124 d2 1.60 1.70 1.80 0.063 0.067 0.071 e 2.85 3.00 3.15 0.112 0.118 0.124 e2 1.10 1.20 1.30 0.043 0.047 0.051 e 0.65 0.026 l 0.50 0.55 0.60 0.020 0.022 0.024 ddd 0.08 0.003
ordering information ts4962 42/44 doc id 10968 rev 8 8 ordering information table 13. order codes part number temperature range package packaging marking TS4962IQT -40c, +85c dfn8 tape & reel k962
ts4962 revision history doc id 10968 rev 8 43/44 9 revision history table 14. document revision history date revision changes 31-may-2006 5 modified package information. now includes only standard dfn8 package. 16-oct-2006 6 added curves in section 3: electrical characteristics . added evaluation board information in section 5: demonstration board . added recommended footprint. 10-jan-2007 7 added paragraph about rated voltage of capacitor in section 4.5: decoupling of the circuit . 18-jan-20 10 8 added table 5: pin description .
ts4962 44/44 doc id 10968 rev 8 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2010 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

▲Up To Search▲

Price & Availability of TS4962IQT

	To Download TS4962IQT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .