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this is information on a product in full production. july 2013 docid14236 rev 2 1/29 ts2012 filter-free stereo 2x2.8 w cl ass d audio power amplifier datasheet - production data features ? operating range from v cc = 2.5 v to 5.5 v ? standby mode active low ? output power per channel: 1.35 w @ 5 v or 0.68 w @ 3.6 v into 8 with 1 % thd+n max ? output power per channel: 2.2 w @ 5 v into 4 with 1 % thd+n max ? four gains can be selected: 6, 12, 18, 24 db ? low current consumption ? psrr: 70 db typ @ 217 hz with 6 db gain ? fast startup phase: 1 ms ? thermal shutdown protection ? qfn20 4x4 mm lead-free package applications ? cellular phone ? pda ? flat panel tv description the ts2012 is a fully differential, class d, power amplifier stereo. it is able to drive up to 1.35 w into an 8 load at 5 v per channel. it achieves outstanding efficiency compared to typical class ab audio amps. the device has four differ ent gain settings utilizing two discrete pins: g0 and g1. pop and click reduction circuitry provides low on/off switch noise while allowing the device to start within 1 ms. two standby pins (active low) allow each channel to be switched off independently. the ts2012 is available in a qfn20 4x4 mm package. gain select pwm h bridge lin + lin - g0 g1 av lout+ lout- cc pv cc pv cc stby l stby r gain select pwm h bridge rin - rin + rout+ rout- oscillator standby control 300k 300k 300k 300k agnd pgnd pgnd 1 2 3 4 5 7 8 9 11 12 13 14 15 16 17 18 19 20 ts2012 - qfn20 (4x4 mm) g1 g0 lout+ pvcc pgnd pvcc rout+ pgnd nc stbyl stbyr avcc lin+ lin- agnd rin- lout- nc rout- rin+ 1 2 4 3 5 67 8 910 11 12 13 14 15 16 17 18 19 20 g1 g0 lout+ pvcc pgnd pvcc rout+ pgnd nc stbyl stbyr avcc lin+ lin- agnd rin- lout- nc rout- rin+ 1 2 4 3 5 67 8 910 11 12 13 14 15 16 17 18 19 20 pin connections (top view) block diagram www.st.com
contents ts2012 2/29 docid14236 rev 2 contents 1 absolute maximum ratings and operating c onditions . . . . . . . . . . . . . 3 2 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 electrical characteristic tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.1 differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.2 gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 4.3 common mode feedback loop limi tations . . . . . . . . . . . . . . . . . . . . . . . . 21 4.4 low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.5 decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.6 wakeup time (t wu ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.7 shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.8 consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 4.9 single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 4.10 output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1 qfn20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
docid14236 rev 2 3/29 ts2012 absolute ma ximum ratings and operating conditions 29 1 absolute maximum ratings and operating conditions table 1. 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. 6 v v i input voltage (2) 2. the magnitude of the input signal must never exceed v cc + 0.3 v / gnd - 0.3 v. gnd to v cc t oper operating free air temperature range -40 to + 85 c t stg storage temperature -65 to +150 t j maximum junction temperature 150 r thja thermal resistance junction to ambient (3) 3. the device is protected in case of over te mperature by a thermal shutdown active @ 150 c. 100 c/w p d power dissipation internally limited (4) 4. exceeding the power derating curves over a long period causes abnormal operation. esd hbm: human body model (5) 5. human body model: 100 pf discharged through a 1.5 k resistor between two pins of the device, done for all couples of pin combinati ons with other pins floating. 2kv mm: machine model (6) 6. machine model: a 200 pf cap is charged to the spec ified voltage, then discharged directly between two pins of the device with no external se ries resistor (internal resistor < 5 ), done for all couples of pin combinations with other pins floating. 200 v latch-up latch-up immunity 200 ma v stby standby pin voltage maximum voltage gnd to v cc v lead temperature (soldering, 10 s) 260 c
absolute maximum ratings and operating conditions ts2012 4/29 docid14236 rev 2 table 2. operating conditions symbol parameter value unit v cc supply voltage 2.5 to 5.5 v v i input voltage range gnd to v cc v ic input common mode voltage (1) 1. i v oo i 40 mv max with all differential gains except 24 db. for 24 db gain, input decoupling caps are mandatory. gnd+0.5v to v cc -0.9v v stby standby voltage input (2) device on device in standby (3) 2. without any signal on v stby , the device is in standby (internal 300 k 20 % pull-down resistor). 3. minimum current consumption is obtained when v stby = gnd. 1.4 v stby v cc gnd v stby 0.4 r l load resistor 4 v ih go, g1 - high level input voltage (4) 4. between g0, g1pins and gnd, there is an internal 300k (20 %) pull-down resistor. when pins are floating, the gain is 6 db. in full standby (left and right channels off), these resistors are disconnected (hiz input). 1.4 v ih v cc v v il go, g1 - low level input voltage gnd v il 0.4 r thja thermal resistance junction to ambient (5) 5. with 4-layer pcb. 40 c/w
docid14236 rev 2 5/29 ts2012 typical application 29 2 typical application figure 1. typical application schematics vcc csl ts2012 15 h 2 f 2 f 15 h 30 h 1 f 1 f 30 h load 4 lc output filter 8 lc output filter gain select gain select standby control pwm h bridge pwm h bridge oscillator lin + lin - rin - rin + g0 g1 stby l stby r av agnd pgnd pgnd lout+ lout- cc pv cc pv cc rout+ rout- left speaker right speaker cin cin left in+ input capacitors are optional left in- differential left input cin cin right in+ right in- differential right input standby control vcc csr vcc cs 100nf vcc csl ts2012 gain select gain select standby control pwm h bridge pwm h bridge oscillator lin + lin - rin - rin + g0 g1 stby l stby r av agnd pgnd pgnd lout+ lout- cc pv cc pv cc rout+ rout- cin cin left in+ input capacitors are optional left in- differential left input cin cin right in+ right in- differential right input gain select standby control vcc csr 1 f vcc cs 100nf lc output filter lc output filter load control gain select control 1 f 1 f 1 f
typical application ts2012 6/29 docid14236 rev 2 table 3. external component descriptions components functional description c s , c sl , c sr supply capacitor that provides power supply filtering. c in input coupling capacitors (optional) that block the dc voltage at the amplifier input terminal. the capacitors also form a high pass filter with z in (f cl = 1 / (2 x x z in x c in )). table 4. pin descriptions pin number pin name pin description 1 g1 gain select pin (msb) 2 lout+ left channel positive output 3 pvcc power supply 4 pgnd power ground 5 lout- left channel negative output 6 nc no internal connection 7 stbyl standby pin (active low) for left channel output 8 stbyr standby pin (active low) for right channel output 9 avcc analog supply 10 nc no internal connection 11 rout- right channel negative output 12 pgnd power ground 13 pvcc power supply 14 rout+ right channel positive output 15 g0 gain select pin (lsb) 16 rin+ right channel positive differential input 17 rin- right channel negative differential input 18 agnd analog ground 19 lin- left channel negative differential input 20 lin+ left channel positive differential input thermal pad connect the thermal pad of the qfn package to pcb ground
docid14236 rev 2 7/29 ts2012 electrical characteristics 29 3 electrical characteristics 3.1 electrical characteristic tables table 5. v cc = +5 v, gnd = 0 v, v ic = 2.5 v, t amb = 25 c (unless otherwise specified) symbol parameters and test conditions min. typ. max. unit i cc supply current no input signal, no load, both channels 58ma i stby standby current no input signal, v stby = gnd 0.2 2 a v oo output offset voltage floating inputs, g = 6db, r l = 8 25 mv p o output power thd + n = 1 % max, f = 1 khz, r l = 4 thd + n = 1 % max, f = 1 khz, r l = 8 thd + n = 10 % max, f = 1 khz, r l = 4 thd + n = 10 % max, f = 1 khz, r l = 8 2.2 1.35 2.8 1.65 w thd + n total harmonic distortion + noise p o = 0.8 w, g = 6 db, f =1 khz, r l = 8 0.07 % efficiency efficiency per channel p o = 2.2 w, r l = 4 +15 h p o = 1.25 w, r l = 8 +15 h 81 89 psrr power supply rejection ratio with inputs grounded c in = 1 f (1) , f = 217 hz, r l = 8 , gain = 6 db , v ripple = 200 mv pp 70 db crosstalk channel separation p o = 0.9 w, g = 6 db, f = 1 khz, r l = 8 90 cmrr common mode rejection ratio c in = 1 f, f = 217 hz, r l = 8 , gain = 6 db , vicm = 200 mv pp 70 gain gain value g1 = g0 = v il g1 = v il & g0 = v ih g1 = v ih & g0 = v il g1 = g0 = v ih 5.5 11.5 17.5 23.5 6 12 18 24 6.5 12.5 18.5 24.5 z in single ended input impedance all gains, referred to ground 24 30 36 k f pwm pulse width modulator base frequency 190 280 370 khz snr signal to noise ratio (a-weighting) p o = 1.3 w, g = 6 db, r l = 8 99 db t wu wakeup time 1 3 ms t stby standby time 1
electrical characteristics ts2012 8/29 docid14236 rev 2 v n output voltage noise f = 20 hz to 20 khz, r l =8 unweighted (filterless, g = 6 db) a-weighted (filterless, g = 6 db) unweighted (with lc output filter, g = 6 db) a-weighted (with lc out put filter, g = 6 db) unweighted (filterless, g = 24 db) a-weighted (filterless, g = 24 db) unweighted (with lc output filter, g = 24 db) a-weighted (with lc outpu t filter, g = 24 db) 63 35 60 35 115 72 109 71 v rms 1. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinus signal to v cc @ f = 217 hz. table 5. v cc = +5 v, gnd = 0 v, v ic = 2.5 v, t amb = 25 c (unless otherwise specified) (continued) symbol parameters and test conditions min. typ. max. unit
docid14236 rev 2 9/29 ts2012 electrical characteristics 29 table 6. v cc = +3.6 v, gnd = 0 v, v ic = 1.8 v, t amb = 25 c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load, both channels 3.3 6.5 ma i stby standby current no input signal, v stby = gnd 0.2 2 a v oo output offset voltage floating inputs, g = 6db, r l = 8 25 mv p o output power thd + n = 1 % max, f = 1 khz, r l = 4 thd + n = 1 % max, f = 1 khz, r l = 8 thd + n = 10 % max, f = 1 khz, r l = 4 thd + n = 10 % max, f = 1 khz, r l = 8 1.15 0.68 1.3 0.9 w thd + n total harmonic distortion + noise p o = 0.4 w, g = 6 db, f =1 khz, r l = 8 0.05 % efficiency efficiency per channel p o = 1.15 w, r l = 4 +15 h p o = 0.68 w, r l = 8 +15 h 80 88 psrr power supply rejection ratio with inputs grounded c in = 1 f (1) , f = 217 hz, r l = 8 , gain = 6 db , v ripple = 200 mv pp 70 db crosstalk channel separation p o = 0.5 w, g = 6 db, f =1 khz, r l = 8 90 cmrr common mode rejection ratio c in = 1 f, f = 217 hz, r l = 8 , gain = 6 db , vicm = 200 mv pp 70 gain gain value g1 = g0 = v il g1 = v il & g0 = v ih g1 = v ih & g0 = v il g1 = g0 = v ih 5.5 11.5 17.5 23.5 6 12 18 24 6.5 12.5 18.5 24.5 z in single ended input impedance all gains, referred to ground 24 30 36 k f pwm pulse width modulator base frequency 190 280 370 khz snr signal to noise ratio (a-weighting) p o = 0.65 w, g = 6 db, r l = 8 96 db t wu wakeup time 1 3 ms t stby standby time 1
electrical characteristics ts2012 10/29 docid14236 rev 2 v n output voltage noise f = 20 hz to 20 khz, r l = 4 unweighted (filterless, g = 6 db) a-weighted (filterless, g = 6 db) unweighted (with lc output filter, g = 6 db) a-weighted (with lc out put filter, g = 6 db) unweighted (filterless, g = 24 db) a-weighted (filterless, g = 24 db) unweighted (with lc output filter, g = 24 db) a-weighted (with lc outpu t filter, g = 24 db) 58 34 55 34 111 70 105 69 v rms 1. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinus signal to v cc @ f = 217 hz. table 6. v cc = +3.6 v, gnd = 0 v, v ic = 1.8 v, t amb = 25 c (unless otherwise specified) (continued) symbol parameter min. typ. max. unit
docid14236 rev 2 11/29 ts2012 electrical characteristics 29 table 7. v cc = +2.5v, gnd = 0v, v ic =1.25v, t amb = 25c (unless otherwise specified) symbol parameter min. typ. max. unit i cc supply current no input signal, no load, both channels 2.8 4 ma i stby standby current no input signal, v stby = gnd 0.2 2 a v oo output offset voltage floating inputs, g = 6db, r l = 8 25 mv p o output power thd + n = 1 % max, f = 1 khz, r l = 4 thd + n = 1 % max, f = 1 khz, r l = 8 thd + n = 10 % max, f = 1 khz, r l = 4 thd + n = 10 % max, f = 1 khz, r l = 8 0.53 0.32 0.75 0.45 w thd + n total harmonic distortion + noise p o = 0.2 w, g = 6 db, f =1 khz, r l = 8 0.04 % efficiency efficiency per channel p o = 0.53 w, r l = 4 +15 h p o = 0.32 w, r l = 8 +15 h 80 88 psrr power supply rejection ratio with inputs grounded c in = 1 f (1) , f = 217 hz, r l = 8 , gain = 6 db , v ripple = 200 mv pp 70 db crosstalk channel separation p o = 0.2 w, g = 6 db, f = 1 khz, r l = 8 90 cmrr common mode rejection ratio c in = 1 f, f = 217 hz, r l = 8 , gain = 6 db , vicm = 200 mv pp 70 gain gain value g1 = g0 = v il g1 = v il & g0 = v ih g1 = v ih & g0 = v il g1 = g0 = v ih 5.5 11.5 17.5 23.5 6 12 18 24 6.5 12.5 18.5 24.5 z in single ended input impedance all gains, referred to ground 24 30 36 k f pwm pulse width modulator base frequency 190 280 370 khz snr signal to noise ratio (a-weighting) p o = 0.3 w, g = 6 db, r l = 8 93 db t wu wakeup time 1 3 ms t stby standby time 1
electrical characteristics ts2012 12/29 docid14236 rev 2 3.2 electrical characteristic 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 0.5 f + 60 h for 8 ) all measurements are made with c sl = c sr = 1 f and c s = 100 nf (see figure 2 ), except for the psrr where c sl,r is removed (see figure 3 ). figure 2. test diagram for measurements v n output voltage noise f = 20 hz to 20 khz, r l = 8 unweighted (filterless, g = 6 db) a-weighted (filterless, g = 6 db) unweighted (with lc out put filter, g = 6 db) a-weighted (with lc output filter, g = 6 db) unweighted (filterless, g = 24 db) a-weighted (filterless, g = 24 db) unweighted (with lc output filter, g = 24 db) a-weighted (with lc output filter, g = 24 db) 57 34 54 33 110 71 104 69 v rms 1. dynamic measurements - 20*log(rms(v out )/rms(v ripple )). v ripple is the superimposed sinus signal to v cc @ f = 217 hz. table 7. v cc = +2.5v, gnd = 0v, v ic =1.25v, t amb = 25c (unless otherwise specified) (continued) symbol parameter min. typ. max. unit vcc cin cin (csr) 1/2 ts2012 c 100nf in+ in- 15 h or 30 h ? or lc filter out+ out- 1 f 4 or 8 rl 5th order 50khz low-pass filter audio measurement bandwith < 30khz gnd gnd gnd s csl
docid14236 rev 2 13/29 ts2012 electrical characteristics 29 figure 3. test diagram for psrr measurements table 8. index of graphics description figure current consumption vs. power supply voltage figure 4 current consumption vs. standby voltage figure 5 efficiency vs. output power figure 6 - figure 9 output power vs. power supply voltage figure 10 , figure 11 psrr vs. common mode input voltage figure 12 psrr vs. frequency figure 13 cmrr vs. common mode input voltage figure 14 cmrr vs. frequency figure 15 gain vs. frequency figure 16 , figure 17 thd+n vs. output power figure 18 - figure 25 thd+n vs. frequency figure 26 - figure 37 crosstalk vs. frequency figure 38 - figure 41 power derating curves figure 42 startup and shutdown time figure 43 , figure 44 vcc cin cin 1/2 ts2012 cs 100nf in+ in- 15 h or 30 h ? or lc filter out+ out- 4 or 8 rl 5th order 50khz low-pass filter rms selective measurement bandwith =1% of fmeas gnd gnd gnd 1 f 1 f gnd 5th order 50khz low-pass filter reference 20hz to 20khz vripple vcc
electrical characteristics ts2012 14/29 docid14236 rev 2 figure 4. current consumption vs. power supply voltage figure 5. current consumption vs. standby voltage (one channel) 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0 1 2 3 4 5 6 one channel on both channels on t amb =25c no loads current consumption (ma) power supply voltage (v) 012345 0.0 0.5 1.0 1.5 2.0 2.5 v cc =3.6v v cc =5v no load t amb =25c v cc =2.5v current consumption (ma) standby voltage (v) figure 6. efficiency vs. outp ut power (i) figure 7. efficiency vs. output power (ii) 0.0 0.1 0.2 0.3 0.4 0.5 0 20 40 60 80 100 0 25 50 75 100 125 vcc=2.5v rl=4 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) 0.0 0.5 1.0 1.5 2.0 0 20 40 60 80 100 0 100 200 300 400 500 vcc=5v rl=4 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) figure 8. efficiency vs. output power (iii) figure 9. efficiency vs. output power (iv) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0 20 40 60 80 100 0 10 20 30 40 50 vcc=2.5v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 20 40 60 80 100 0 40 80 120 160 200 vcc=5v rl=8 + 15 h f=1khz thd+n 1% power dissipation efficiency efficiency (%) output power (w) power dissipation (mw)
docid14236 rev 2 15/29 ts2012 electrical characteristics 29 figure 10. output power vs. power supply voltage (i) figure 11. output po wer vs. power supply voltage (ii) 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) power supply voltage (v) 2.53.03.54.04.55.05.5 0.0 0.4 0.8 1.2 1.6 2.0 thd+n=10% rl = 8 + 15 h f = 1khz bw < 30khz tamb = 25 c thd+n=1% output power (w) power supply voltage (v) figure 12. psrr vs. common mode input voltage figure 13. psrr vs. frequency 0.00.51.01.52.02.53.03.54.04.55.0 -80 -70 -60 -50 -40 -30 -20 -10 0 gain=6db gain=24db vcc=3v vcc=2.5v vcc=5v vripple = 200mvpp, f = 217hz rl 4 + 15 h, tamb = 25 c psrr(db) common mode input voltage (v) 100 1k 10k -80 -70 -60 -50 -40 -30 -20 -10 0 gain=24db inputs grounded, vripple = 200mvpp rl 4 + 15 h, cin=1 f, tamb=25 c vcc = 2.5, 3.6, 5v 20k 20 gain=6db psrr (db) frequency (hz) figure 14. cmrr vs. common mode input voltage figure 15. 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 gain=6db gain=24db vcc=3v vcc=2.5v vcc=5v vicm=200mvpp, f = 217hz rl 4 + 15 h, tamb = 25 c cmrr(db) common mode input voltage (v) 100 1k 10k -80 -70 -60 -50 -40 -30 -20 -10 0 gain=24db vicm=200mvpp, vcc = 2.5, 3.6, 5v rl 4 + 15 h, cin=1 f, tamb=25 c 20k 20 gain=6db cmrr (db) frequency (hz)
electrical characteristics ts2012 16/29 docid14236 rev 2 figure 16. gain vs. frequency (i) f igure 17. gain vs. frequency (ii) 100 1k 10k 0 2 4 6 8 rl=4 +30 h rl=4 +15 h rl=8 +30 h rl=8 +15 h no load gain = 6db vin = 500mv cin = 4.7 f t amb = 25 c gain (db) frequency (hz) 20 20k 100 1k 10k 18 20 22 24 26 rl=4 +30 h rl=4 +15 h rl=8 +30 h rl=8 +15 h no load gain = 24db vin = 5mv cin = 4.7 f t amb = 25 c gain (db) frequency (hz) 20 20k figure 18. thd+n vs. output power (i) f igure 19. thd+n vs. output power (ii) 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 f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 20. thd+n vs. output power (iii) f igure 21. thd+n vs. output power (iv) 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 f = 1khz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w)
docid14236 rev 2 17/29 ts2012 electrical characteristics 29 figure 22. thd+n vs. output power (v) figure 23. thd+n vs. output power (vi) 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 f = 100hz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 24. thd+n vs. output power (vii) figure 25. thd+n vs. output power (viii) 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 f = 100hz g = 6db bw < 30khz tamb = 25 c thd + n (%) output power (w) figure 26. thd+n vs. frequency (i) figure 27. thd+n vs. frequency (ii) 100 1000 10000 0.01 0.1 1 10 po=0.2w po=0.4w rl=4 + 15 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.2w po=0.4w rl=4 + 30 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 20 thd + n (%) frequency (hz)
electrical characteristics ts2012 18/29 docid14236 rev 2 figure 28. thd+n vs. frequency (iii) figure 29. thd+n vs. frequency (iv) 100 1000 10000 0.01 0.1 1 10 po=0.1w po=0.2w rl=8 + 15 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.1w po=0.2w rl=8 + 30 h g=6db bw < 30khz vcc=2.5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) figure 30. thd+n vs. frequency (v) figure 31. thd+n vs. frequency (vi) 100 1000 10000 0.01 0.1 1 10 po=0.45w po=0.9w rl=4 + 15 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.45w po=0.9w rl=4 + 30 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 20 thd + n (%) frequency (hz) figure 32. thd+n vs. frequency (vii) figure 33. thd+n vs. frequency (viii) 100 1000 10000 0.01 0.1 1 10 po=0.25w po=0.5w rl=8 + 15 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.25w po=0.5w rl=8 + 30 h g=6db bw < 30khz vcc=3.6v tamb = 25 c 20k 20 thd + n (%) frequency (hz)
docid14236 rev 2 19/29 ts2012 electrical characteristics 29 figure 34. thd+n vs. frequency (ix) figure 35. thd+n vs. frequency (x) 100 1000 10000 0.01 0.1 1 10 po=0.75w po=1.5w rl=4 + 15 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.75w po=1.5w rl=4 + 30 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) figure 36. thd+n vs. frequency (xi) figure 37. thd+n vs. frequency (xii) 100 1000 10000 0.01 0.1 1 10 po=0.45w po=0.9w rl=8 + 15 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 0.01 0.1 1 10 po=0.45w po=0.9w rl=8 + 30 h g=6db bw < 30khz vcc=5v tamb = 25 c 20k 20 thd + n (%) frequency (hz) figure 38. crosstalk vs. frequency (i) figure 39. crosstalk vs. frequency (ii) 100 1k 10k -120 -100 -80 -60 -40 -20 0 r -> l l -> r vcc=2.5, 3.6, 5v rl=4 +30 h gain = 6db t amb = 25 c crosstalk (db) frequency (hz) 20 20k 100 1k 10k -120 -100 -80 -60 -40 -20 0 r -> l l -> r vcc=2.5, 3.6, 5v rl=8 +30 h gain = 6db t amb = 25 c crosstalk (db) frequency (hz) 20 20k
electrical characteristics ts2012 20/29 docid14236 rev 2 figure 40. crosstalk vs. frequency (iii) f igure 41. crosstalk vs. frequency (iv) 100 1k 10k -120 -100 -80 -60 -40 -20 0 r -> l l -> r vcc = 2.5, 3.6, 5v rl = 4 +30 h gain = 24db t amb = 25 c crosstalk (db) frequency (hz) 20 20k 100 1k 10k -120 -100 -80 -60 -40 -20 0 r -> l l -> r vcc=2.5, 3.6, 5v rl=8 +30 h gain = 24db t amb = 25 c crosstalk (db) frequency (hz) 20 20k figure 42. power derating curves figure 43. startup and shutdown phase (i) figure 44. startup and shutdown phase (ii) 0 25 50 75 100 125 150 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 no heat sink with 4-layer pcb qfn20 package power dissipation (w) ambient temperature ( c)
docid14236 rev 2 21/29 ts2012 application information 29 4 application information 4.1 differential configuration principle the ts2012 is a monolithic fully-differential input/output class d power amplifier. the ts2012 also includes a common-mode feedback l oop 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 with a single-ended topology, the output is four times higher for the same power supply voltage. the advantages of a full-differential amplifier are: ? high psrr (power supply rejection ratio) ? high common mode noise rejection ? virtually zero pop without additional circuitry, giving a faster startup time compared with conventional single-ended input amplifiers ? easier interfacing with differential output audio dac ? no input coupling capacitors required thanks to common mode feedback loop 4.2 gain settings in the flat region of the freq uency-response curve (no input coupling capacitor or internal feedback loop + load effect), the differential ga in can be set to 6, 12 18, or 24 db depending on the logic level of the g0 and g1 pins, as shown in table 9 . note: between pins g0, g1 and gnd there is an internal 300 k (20 %) resistor. when the pins are floating, the gain is 6 db. in full standby (l eft and right channels off), these resistors are disconnected (hiz input). 4.3 common mode feedback loop limitations 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 ic limitation of the input stage (see table 2: operating conditions ), the common mode feedback loop can fulfill its role only within the defined range. table 9. gain settings with g0 and g1 pins g1 g0 gain (db) gain (v/v) 0062 01124 10188 1 1 24 16
application information ts2012 22/29 docid14236 rev 2 4.4 low frequency response if a low frequency bandwid th limitation is required, it is possible to use input coupling capacitors. in the low frequency region, the input coupling capacitor, c in , starts to have an effect. c in , with the input impedance z in , forms a first order, high-pass filter with a -3 db cut- off frequency (see table 5 to table 7 ) as shown in equation 1 : equation 1 so, for a desired cut-off frequency, f cl, c in is calculated as shown in equation 2 : equation 2 with f cl in hz, z in in and c in in f. the input impedance z in is typically 30 k for the whole power supply voltage range. there is also a tolerance around the typical value (see table 5 to table 7 ). the maximum and minimum tolerance of the f cl can be calculated using equation 3 and equation 4 respectively. equation 3 equation 4 4.5 decoupling of the circuit power supply capacitors, referred to as c s , c sl , and c sr are needed to correctly bypass the ts2012. the ts2012 has a typical switching frequency of 280 khz and an output fall and rise time of about 5 ns. due to these very fast transients, careful decoupling is mandatory. a 1 f ceramic capacitor between each pvcc and pgnd and also between avcc and agnd is enough, but they must be located very close to the ts2012 in order to avoid any extra parasitic inductance created by a long track wire. parasitic loop inductance, in relation to di/dt, introduces overvoltage that decreases the global efficiency of the device and may also cause a ts2012 breakdown if the parasitic inductance is too high. in addition, even if a ceramic capacitor has an adequate high frequency esr value, its current capability is also important. a 0603 size is a good compromise , particularly when a 4 load is used. f cl 1 2 z in c in ?? ? -------------------------------------------- = c in 1 2 z in f cl ?? ? --------------------------------------------- - = f clmax 1.103 f cl ? = f clmin 0.915 f cl ? =
docid14236 rev 2 23/29 ts2012 application information 29 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. with a power supply voltage of 5 v, the decoupling value, instead of 1 f, could be reduced to 0.5 f. as c s has particular influence on the thd+n in the medium to high freque ncy region, this capaci tor variation becomes decisive. in addition, less decoupling means high er overshoots which can be problematic if they reach the power supply amr value (6 v). 4.6 wakeup time (t wu ) when standby is released to set the device on, there is typically a delay of 1 ms. the ts2012 has an internal digital delay that mute s the outputs and releas es them after this delay time to avoid any pop noise. note: the gain increases smoothly (see figure 44 ) from the mute to the ga in selected by the g1 and g0 pin ( section 4.2 ). 4.7 shutdown time when the standby command is set, the time required to set the output stage to high impedance and to put the internal circuitry in sh utdown mode, is typically 1 ms. this time is used to decrease the gain and avoid any pop noise during shutdown. note: the gain decreases smoothly until the outputs are muted (see figure 44 ). 4.8 consumption in shutdown mode between the shutdown pin and gnd there is an internal 300 k ( 20 %) resistor. this resistor forces the ts2012 to be in shutdown when the shutdown input is left floating. however, this resistor also introduces addi tional shutdown power consumption if the shutdown pin voltage is not 0 v. for example, with a 0.4 v shutdown voltage pin, the following typical and maximum values respectively for each shutdown pin must be added to the standby current specified in table 5 to table 7 : 0.4 v/300 k = 1.3 a and 0.4 v/240 k = 1.66 a. this current is provided by the external control device for standby pins.
application information ts2012 24/29 docid14236 rev 2 4.9 single-ended input configuration it is possible to use the ts2012 in a single-ended input configuration. however, input coupling capacitors are mandat ory in this configuration. the schematic diagram in figure 45 shows a typical single-ended input application. figure 45. typical application fo r single-ended input configuration 4.10 output filter considerations the ts2012 is designed to operate without an output filter. however, due to very sharp transients on the ts2012 output, emi radiated emissions may cause some standard compliance issues. these emi standard compliance issues can appear if the distance between the ts2012 outputs and the loudspeaker terminal are 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 probability of emi issues, the following simple rules should be followed: ? reduce as much as possible the distance between the ts2012 output pins and the speaker terminals. ? use a ground plane for ?shielding? sensitive wires. ? place, as close as possible to the ts2012 an d in series with each output, a ferrite bead with a minimum rated current of 2.5 a and an impedance greater than 50 at frequencies above 30 mhz. if, after testin g, these ferrite beads are not necessary, replace them by a short-circuit. ? allow extra footprint to place, if necessary, a capacitor to short perturbations to ground (see figure 46 ). vcc csl ts2012 gain select gain select standby control pwm h bridge pwm h bridge oscillator lin + lin - rin - rin + g0 g1 stby l stby r av agnd pgnd pgnd lout+ lout- cc pv cc pv cc rout+ rout- left speaker right speaker cin cin left input cin cin right input standby control vcc csr vcc cs 100nf gain select control 1 f 1 f
docid14236 rev 2 25/29 ts2012 application information 29 figure 46. ferrite chip bead placement if the distance between the ts2012 output and the speaker terminals is too long, it is possible to have low frequency emi issues d ue to the fact that the typical operating frequency is 280 khz. in this config uration, it is necessary to place the output filter shown in figure 1: typical application schematics as close as possible to the ts2012. to speaker about 100pf gnd ferrite chip bead from output
package information ts2012 26/29 docid14236 rev 2 5 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions a nd product status are available at: www.st.com . ecopack ? is an st trademark. 5.1 qfn20 package information the qfn20 package has an exposed pad e2 x d2. 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 pi n 4, 12, 18 (pgnd, agnd) or left floating. figure 47. qfn20 package mechanical drawing
docid14236 rev 2 27/29 ts2012 package information 29 figure 48. qfn20 footprint recommendation table 10. qfn20 package mechanical data ref dimensions in mm dimensions in inches min typ max min typ max a 0.8 0.9 1 0.031 0.035 0.039 a1 0.02 0.05 0.001 0.002 a2 0.65 1 0.026 0.039 a3 0.25 0.010 b 0.18 0.23 0.3 0.007 0.009 0.012 d 3.85 4 4.15 0.152 0.157 0.163 d2 2.6 0.102 e 3.85 4 4.15 0.152 0.157 0.163 e2 2.6 0.102 e 0.45 0.5 0.55 0.018 0.020 0.022 l 0.3 0.4 0.5 0.012 0.016 0.020 ddd 0.08 0.003 table 11. qfn20 footprint data ref. dimensions in mm dimensions in inches a 4.55 0.179 b c 0.50 0.020 d 0.35 0.014 e 0.65 0.026 f 2.45 0.096 g 0.40 0.016
ordering information ts2012 28/29 docid14236 rev 2 6 ordering information 7 revision history table 12. order code part number temperature range package packaging marking TS2012IQT -40 c to +85 c qfn20 tape and reel k012 table 13. document revision history date revision changes 17-dec-2007 1 first release. 17-jul-2013 2 small text changes throughout document. updated titles of figure 6 to figure 11 and figure 16 to figure 44 table 10: qfn20 package mechanical data : added package mechanical dimensions in inches. added table 11: qfn20 footprint data table 12: order code ; updated ?marking?
docid14236 rev 2 29/29 ts2012 29 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not authorized for use in weapons. nor are st products designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2013 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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