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october 2010 doc id 17913 rev 1 1/31 31 TS4604 stereo headset driver and an alog audio line driver with integrated reference to ground features operating from v cc = 3 v up to 4.8 v single supply operation line driver stereo differential inputs external gain setting resistors space-saving package: tssop28 pitch 0.65 mm dedicated shutdown control per function 100 mw headset drive into a 16 load 90 db high psrr on headset drive two internal negative supplies to ensure ground-referenced, headset and line driver capless outputs internal undervoltage mute line driver 2 vrms typ. output voltage across entire supply voltage range pop-&-click reduction circuitry, thermal shutdown and output short-circuit protection applications pdp/lcd tv set-top boxes description the TS4604 is a stereo ground-referenced output analog line driver and stereo headset driver whose design allows the output dc-blocking capacitors to be removed, thus reducing component count. the TS4604 drives 2 vrms into a 5 k load or more. the device has differential inputs and uses external gain setting resistors. the TS4604 delivers up to 100 mw per channel into a 16 load. all outputs of the TS4604 include 8 kv human body model esd protection cells. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 +ldl -ldl outldl agnd enld pvssld cnld cnhp pvsshp enhp agnd outhpl -hpl +hpl +hpr -hpr outhpr nc pgnd pvcchp cphp cpld pvccld pgnd euvp outldr -ldr +ldr tssop28 pin connections (top view) www.st.com
contents TS4604 2/31 doc id 17913 rev 1 contents 1 absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 characteristics of the line driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5 characteristics of the he adset driver . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6.1 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6.2 use of ceramic capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.3 flying and tank capacitor for the inter nal negative supply . . . . . . . . . . . . 18 6.4 power supply decoupling capacitor (cs) . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.5 input coupling capacitor (cin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.6 range of the gain setting resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.7 performance of cmrr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.8 internal and external undervoltage detection . . . . . . . . . . . . . . . . . . . . . . 21 6.8.1 internal uvlo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.8.2 external uvlo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.9 2nd order butterworth low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6.10 esd protection and compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6.11 pop-&-click circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.12 start-up phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 6.13 layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7.1 tssop28 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 8 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
TS4604 absolute maximum rati ngs and operating conditions doc id 17913 rev 1 3/31 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings (amr) symbol parameter value unit v cc supply voltage (1) 1. all voltage values are measur ed with respect to the ground pin. 5.5 v v in input voltage enable & standby pin (2) 2. the magnitude of the input signal must never exceed v cc + 0.3 v/gnd - 0.3 v. gnd to v cc v v in input signal voltage -2.5 to +2.5 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 (3) 3. the device is protected from overheating by a thermal shutdow n mechanism active at 150 c. 200 c/w p d power dissipation internally limited (4) 4. exceeding the power derating curves during a long period provokes abnor mal operating conditions. esd human body model for all pins except outputs human body model for all output pins 2 8 kv machine model 200 v charge device model 1500 v latch-up latch-up immunity 200 ma lead temperature (soldering, 10sec) 260 c table 2. operating conditions symbol parameter value unit v cc supply voltage 3 to 4.8 v vicm common-mode input volta ge range from -1.4 to 1.4 v r ld line drive load resistor 5k r hd headset drive load resistor 16 r thja thermal resistance junction-to-ambient (1) 1. with heatsink surface = 125 mm 2 . 80 c/w
typical application TS4604 4/31 doc id 17913 rev 1 2 typical application figure 1. simplified application schemati cs in differential configuration setting r1 r1 r2 r2 r2 1 f 1 f r1 r1 r2 r1 r1 r2 r2 r1 r1 r2 r2 1 f 1 f 3 to 4. 8 v 3 to 4. 8 v >5 k >5 k 16/ 3 2 16/ 3 2 -ldr +ldr -ldl +ldl -hpr +hpr -hpl +hpl agnd agnd pvcchp pv ss hp pgnd cphp cnhp cpld cnld pv ss ld pgnd pvccld enld enhp euvp outhpl outhpr outldl outldr r1= 10 k , r2 = av x r1 with r2 100 k t s 4604 neg a tive ch a rged p u mp he a d s et neg a tive ch a rged p u mp line driver power m a n a gement therm a l s h u tdown uvlo am061 38 1 f 1 f 2.2 f 2.2 f 2.2 f 2.2 f 2.2 f 2.2 f 2.2 f 2.2 f
TS4604 typical application doc id 17913 rev 1 5/31 table 3. pin descriptions pin number i/o (1) pin name pin description 1 i +ldl left line driver positive input channel 2 i -ldl left line driver negative input channel 3 o outldl left line driver output channel 4 p agnd analog line driver power ground 5 i enld line driver enable input pin (active high) 6 o pvssld output from line drive charge pump 7 i/o cnld line driver charge pump flying capacitor negative terminal 8 i/o cnhp headset charge pump flying capacitor negative terminal 9 i/o pvsshp output from headset drive charge pump 10 i enhp headset driver enable input pin (active high) 11 p agnd headphone analog input power ground 12 o outhpl left headset driver output channel 13 i -hpl left headset driver negative input channel 14 i +hpl left headset driver positive input channel 15 i +hpr right headset driver positive input channel 16 i -hpr right headset driver negative input channel 17 o outhpr right headset driver output channel 18 nc not connected 19 p pgnd headset driver power ground 20 p pvcchp headset driver power supply voltage (2) 21 i/o cphp headset charge pump flying capacitor positive terminal 22 i/o cpld line driver charge pump flying capacitor positive terminal 23 p pvccld line driver power supply voltage (2) 24 p pgnd line driver power ground 25 i euvp external undervoltage protection input pin 26 o outldr right line driver output channel 27 i -ldr right line driver negative input channel 28 i +ldr right line driver positive input channel 1. i = input, o = output, p = power 2. pvcchp and pvccld are internally connec ted, so pvcchp must be equal to pvccld.
electrical characteristics TS4604 6/31 doc id 17913 rev 1 3 electrical characteristics table 4. common part: v cc = +3.3 v, gnd = 0 v, cphp = cpld = 1 f, t amb = 25c (unless otherwise specified) symbol parameters and test conditions min. typ. max. unit v il v enhp and v enld input voltage low 38 40 43 % vcc v ih v enhp and v enld input voltage high 57 60 66 % vcc i ih high level input current (enhp and enld) -1 1 a i il low level input current (enhp and enld) -1 1 a f osc internal negative voltage switching frequency, all temperature range 400 550 800 khz vup external undervoltage detection threshold 1.15 1.25 1.35 v ihyst external undervoltage detection hysteresis current 5 a vhyst pvcc_hp/ld internal undervoltage detection hysteresis 200 mv vuvl pvcc_hp/ld internal undervoltage detection ? power up ? power down 2.8 2.6 v av overall external gain (r2 100 k , r1 = r2/av) 0 1 20 10 db v/v
TS4604 electrical characteristics doc id 17913 rev 1 7/31 table 5. headset driver part: v cc = +3.3 v, gnd = 0 v, enhp = v cc , enld = gnd, cphp = cpld = 1 f, av = 1 (r1 = r2 = 10 k ), t amb = 25c (unless otherwise specified) symbol parameters and test conditions min. typ. max. unit i cc supply current (no input signal, no load) 5 6.5 ma i enhp headset overall standby current (no input signal): v enhp = gnd v enhp = 38% v cc 1 5 100 a v io input offset voltage -7 0 7 mv p o headphone output power: thd + n = 1% max, f = 1 khz, bw = 22 khz, r l = 16 45 65 mw p o headphone output power: thd + n = 1% max, f = 1 khz, bw = 22 khz, r l = 32 30 45 mw thd + n total harmonic distortion + noise: r l = 16 , p o = 60 mw, f = 20 hz to 20 khz, bw = 22 khz 0.05 % psrr headphone power supply rejection ratio with ac inputs grounded: f = 217 hz,v ripple = 200 mv pp 90 db t wu total wake-up time 30 ms t stby standby time 20 s xtalk crosstalk headphone to line: pout = 50 mw, r l = 16 , f = 20 hz to 20 khz -100 db snr signal-to-noise ratio (a-weighting): r l = 16 , p o = 60 mw 102 db cmrr common-mode rejection ratio: f = 20 hz to 20 khz, vic = 200 mvpp -70 db v n output voltage noise: f = 20 hz to 20 khz, a-weighted 7.6 v rms cl (1) capacitive load: r l = 16 to 100 r l > 100 400 100 pf 1. higher capacitive loads are possibl e by adding a serial resistor of 47 in the line driver output.
electrical characteristics TS4604 8/31 doc id 17913 rev 1 table 6. line driver part: v cc = +3.3 v, gnd = 0 v, av = 1 (r1 = r2 = 10 k ), enld = v cc , enhp = gnd, cphp = cpld = 1 f, r l = 10 k , t amb = 25c (unless otherwise specified) symbol parameters and test conditions min. typ. max. unit i cc supply current (no input signal, no load) 5 6.5 ma i enld line drive standby current (no input signal) v enld = gnd v enld = 38% v cc 5 100 a v io input offset voltage -7 0 +7 mv v swing output voltage swing: r l = 10 k , c l = 100 pf, thd+n = 0.1% 2.1 vrms psrr line driver power supply rejection ratio with ac inputs grounded: f = 217 hz, v ripple = 200 mv pp 90 db t wu wake-up time from shutdown 30 ms t stby standby time 20 s snr signal-to-noise ratio (a-weighting): vin = 1.7 vrms 102 db v n output voltage noise: f = 20 hz to 20 khz, a-weighted 8 v rms gbw gain bandwidth product 1 mhz sr slew rate 0.5 v / s thd+n bw = 22 khz, r l = 10 k , v o = 1.5 vrms, av = 1, f = 20 hz to 20 khz 0.001 % cmrr f = 20 hz to 20 khz, vic = 200 mvpp -70 db xtalk crosstalk channel: f = 20 hz to 20 khz, vo = 1.5 vrms, r l = 5 k -120 db cl (1) capacitive load: r l > 5 k 400 pf 1. higher capacitive loads are possibl e by adding a serial resistor of 47 in the line driver output.
TS4604 characteristics of the line driver doc id 17913 rev 1 9/31 4 characteristics of the line driver figure 2. current consumption vs. power supply figure 3. output voltage vs. power supply 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 no load; no input signal line driver ta=25c quiescent supply current icc (ma) power supply voltage vcc (v) 3.03.13.23.33.43.53.63.73.83.94.04.14.24.34.44.54.64.74.8 1.9 2.0 2.1 2.2 2.3 2.4 thd+n=1% thd+n=0.1% rl 5k , f=1khz bw<30khz, ta=25 c line driver output voltage (vrms) power supply voltage vcc (v) figure 4. thd+n vs. output power (g=0 db) figure 5. thd+n vs. output power (g=20 db) 10 100 1000 1e-4 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 5k to 10k vcc = 3.3v to 4.8v, g = 0db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output voltage (mvrms) 100 1000 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 5k to 10k vcc = 3.3v to 4.8v, g = 20db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output voltage (mvrms) figure 6. thd+n vs. frequency (g=0 db) figure 7. thd+n vs. frequency (g=20 db) 100 1000 10000 1e-4 1e-3 0.01 0.1 1 vo=2vrms vo=1.5vrms rl = 5k to 10k vcc = 3.3v to 4.8v g = 0db, inputs = 0 & 180 bw < 20khz, tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 1e-3 0.01 0.1 1 vo=2vrms vo=1.5vrms rl = 5k to 10k vcc = 3.3v to 4.8v g = 20db, inputs = 0 & 180 bw < 20khz, tamb = 25 c 20k 20 thd + n (%) frequency (hz)
characteristics of the line driver TS4604 10/31 doc id 17913 rev 1 figure 8. cmrr vs. frequency figure 9. psrr vs. frequency 100 1000 10000 -80 -70 -60 -50 -40 -30 -20 -10 0 g=0db 20k 20 g=20db vic = 200mvpp vcc = 3.3v rl 5k tamb = 25 c cmrr (db) frequency (hz) 100 1000 10000 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 g=0db g=20db 20k 20 vripple = 200mvpp vcc = 3.3v inputs = grounded rl 5k tamb = 25 c psrr (db) frequency (hz) figure 10. crosstalk vs. frequency left to right & right to left channel figure 11. crosstalk vs. frequency headset to line driver 100 1000 10000 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 g=0db 20k 20 g=20db vcc = 3.3v vout = 2vrms right to left & left to right rl 5k tamb = 25 c crosstalk (db) frequency (hz) 100 1000 10000 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 hp to line right hp to line left 20k 20 vcc = 3.3v, g=0db rl = 16 on hp po = 50 mw on hp ld inputs grounded tamb = 25 c crosstalk (db) frequency (hz) figure 12. output signal spectrum figure 13. frequency response 100 1000 10000 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 vcc = 3.3v, g=0db rl=10k tamb = 25 c output signal (dbv) frequency (hz) 1000 10000 100000 1000000 1e7 -80 -70 -60 -50 -40 -30 -20 -10 0 10 vcc = 3.3v, g=0db no load tamb = 25 c gain (db) frequency (hz)
TS4604 characteristics of the headset driver doc id 17913 rev 1 11/31 5 characteristics of the headset driver figure 14. current consumption vs. power supply figure 15. standby current vs. power supply 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 no load; no input signal headset driver ta=25c quiescent supply current icc (ma) power supply voltage vcc (v) 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 0 200 400 600 800 1000 1200 no load; no input signal line driver ta=25c standby current istby (na) power supply voltage vcc (v) figure 16. output power vs. power supply (r l = 16 , g = 0 db) figure 17. output power vs. power supply (r l = 16 , g = 20 db) 3 .0 3 .1 3 .2 3 . 33 .4 3 .5 3 .6 3 .7 3 . 83 .9 4.0 4.1 4.2 4. 3 4.4 4.5 4.6 4.7 4. 8 0 20 40 60 8 0 100 120 140 160 1 8 0 thd+n=10 % (0 ) thd+n=1 % (1 8 0 ) thd+n=1 % (0 ) thd+n=10 % (1 8 0 ) rl = 16 , f=1khz g=0db bw< 3 0khz, t a =25 c he a d s et driver power output (mw) power s upply volta g e vcc (v) 3 .0 3 .1 3 .2 3 . 33 .4 3 .5 3 .6 3 .7 3 . 83 .9 4.0 4.1 4.2 4. 3 4.4 4.5 4.6 4.7 4. 8 0 20 40 60 8 0 100 120 140 160 1 8 0 thd+n=10 % (0 ) thd+n=1 % (1 8 0 ) thd+n=1 % (0 ) thd+n=10 % (1 8 0 ) rl = 16 , f=1khz g=20db bw< 3 0khz, t a =25 c he a d s et driver power output (mw) power s upply volta g e vcc (v)
characteristics of the headset driver TS4604 12/31 doc id 17913 rev 1 figure 18. output power vs. power supply (r l = 32 , g = 0 db) figure 19. output power vs. power supply (r l = 32 , g = 20 db) 3 .0 3 .1 3 .2 3 . 33 .4 3 .5 3 .6 3 .7 3 . 83 .9 4.0 4.1 4.2 4. 3 4.4 4.5 4.6 4.7 4. 8 0 20 40 60 8 0 100 120 140 160 1 8 0 thd+n=1 % thd+n=10 % rl = 3 2 , f=1khz g=0db, 0 & 1 8 0 bw< 3 0khz, t a =25 c he a d s et driver power output (mw) power s upply volta g e vcc (v) 3 .0 3 .1 3 .2 3 . 33 .4 3 .5 3 .6 3 .7 3 . 83 .9 4.0 4.1 4.2 4. 3 4.4 4.5 4.6 4.7 4. 8 0 20 40 60 8 0 100 120 140 160 1 8 0 thd+n=1 % thd+n=10 % rl = 3 2 , f=1khz g=20db, 0 & 1 8 0 bw< 3 0khz, t a =25 c he a d s et driver power output (mw) power s upply volta g e vcc (v) figure 20. thd+n vs. output power (r l = 16 , g = 20 db, v cc = 3.0 v inputs in-phase) figure 21. thd+n vs. output power (r l = 16 , g = 0 db, v cc = 3.0 v inputs in-phase) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 3.0v, g = 20db inputs = 0 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 3.0v, g = 0db inputs = 0 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) figure 22. thd+n vs. output power (r l = 16 , g = 0 db, v cc = 3.3 v inputs out-of-phase) figure 23. thd+n vs. output power (r l = 16 , g = 20 db, v cc = 3.3 v inputs in-phase) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 3.0v, g = 0db inputs = 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 3.3v, g = 20db inputs = 0 bw < 30khz, tamb = 25 c thd+n (%) output power (mw)
TS4604 characteristics of the headset driver doc id 17913 rev 1 13/31 figure 24. thd+n vs. output power (r l = 16 , g = 0 db, v cc = 3.3 v inputs in-phase) figure 25. thd+n vs. output power (r l = 16 , g = 0 db, v cc = 3.3 v, inputs out-of-phase) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 3.3v, g = 0db inputs = 0 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 3.3v, g = 0db inputs = 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) figure 26. thd+n vs. output power (r l = 16 , g = 20 db, v cc = 4.8 v, inputs in-phase) figure 27. thd+n vs. output power (r l = 16 , g = 0 db, v cc = 4.8 v inputs in-phase) figure 28. thd+n vs. output power (r l = 16 , g = 0 db, v cc = 4.8 v inputs out-of-phase) figure 29. thd+n vs. output power (r l = 32 , v cc = 3.0 v, g = 0 db) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 4.8v, g = 20db inputs = 0 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-4 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 4.8v, g = 0db inputs = 0 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 16 vcc = 4.8v, g = 0db inputs = 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-4 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 32 vcc = 3.0v, g = 0db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw)
characteristics of the headset driver TS4604 14/31 doc id 17913 rev 1 figure 30. thd+n vs. output power (r l = 32 , v cc = 3.0 v, g = 20 db) figure 31. thd+n vs. output power (r l = 32 , v cc = 3.3 v, g = 0 db) figure 32. thd+n vs. output power (r l = 32 , v cc = 3.3 v, g = 20 db) figure 33. thd+n vs. output power (r l = 32 , v cc = 4.8 v, g = 0 db) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 32 vcc = 3.0v, g = 20db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-4 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 32 vcc = 3.3v, g = 0db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 32 vcc = 3.3v, g = 20db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 0.1 1 10 100 1e-4 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 32 vcc = 4.8v, g = 0db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) figure 34. thd+n vs. output power (r l = 32 , v cc = 4.8 v, g = 20 db) figure 35. thd+n vs. frequency (r l = 16 , g = 0 db) 0.1 1 10 100 1e-3 0.01 0.1 1 10 f=80hz f=1khz f=8khz rl = 32 vcc = 4.8v, g = 20db inputs = 0 & 180 bw < 30khz, tamb = 25 c thd+n (%) output power (mw) 100 1000 10000 1e-3 0.01 0.1 1 po=1mw po=15mw rl = 16 vcc = 3.0v to 4.8v g = 0db, inputs = 0 & 180 bw < 20khz, tamb = 25 c 20k 20 thd + n (%) frequency (hz)
TS4604 characteristics of the headset driver doc id 17913 rev 1 15/31 figure 36. thd+n vs. frequency (r l = 16 , g = 20 db) figure 37. thd+n vs. frequency (r l = 32 , g = 0 db) figure 38. thd+n vs. frequency (r l = 32 , g = 20 db) figure 39. cmrr vs. frequency (headset) 100 1000 10000 1e-3 0.01 0.1 1 po=1mw po=15mw rl = 16 vcc = 3.0v to 4.8v g = 20db, inputs = 0 & 180 bw < 20khz, tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 1e-3 0.01 0.1 1 po=1mw po=10mw rl = 32 vcc = 3.0v to 4.8v g = 0db, inputs = 0 & 180 bw < 20khz, tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 1e-3 0.01 0.1 1 po=1mw po=10mw rl = 32 vcc = 3.0v to 4.8v g = 20db, inputs = 0 & 180 bw < 20khz, tamb = 25 c 20k 20 thd + n (%) frequency (hz) 100 1000 10000 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 g=0db 20k 20 g=20db vic = 200mvpp vcc = 3.3v rl 16 tamb = 25 c cmrr (db) frequency (hz) figure 40. pssr vs. frequency (headset ) figure 41. crosstal k vs. frequency (left to right, pout = 50 mw) 100 1000 10000 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 g=0db g=20db 20k 20 vripple = 200mvpp vcc = 3.3v inputs = grounded rl 16 tamb = 25 c psrr (db) frequency (hz) 100 1000 10000 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 left to right 20k 20 right to left vcc = 3.3v pout = 50mw, g=0db rl = 16 tamb = 25 c crosstalk (db) frequency (hz)
characteristics of the headset driver TS4604 16/31 doc id 17913 rev 1 figure 42. crosstalk vs. frequency (left to right, pout = 35 mw) figure 43. crosstalk vs. frequency line driver to headset figure 44. frequency response 100 1000 10000 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 left to right 20k 20 right to left vcc = 3.3v pout = 35mw, g=0db rl = 32 tamb = 25 c crosstalk (db) frequency (hz) 100 1000 10000 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 ld to hp left 20k 20 ld to hp right vcc = 3.3v vout = 2vrms on ld, g=0db rl = 10k on ld hp inputs = ground tamb = 25 c crosstalk (db) frequency (hz) 1000 10000 100000 1000000 1e7 -80 -70 -60 -50 -40 -30 -20 -10 0 10 vcc = 3.3v, g=0db no load tamb = 25 c gain (db) frequency (hz)
TS4604 application information doc id 17913 rev 1 17/31 6 application information 6.1 general description the TS4604 is a stereo headset driver and a ground-referenced stereo audio line driver. to save energy, each audio path, line driver or headphone can be independently set to standby mode. the headphone delivers up to 100 mw into a 16 load, and the line driver drives up to 2 vrms into 5k or more. the gain can be set up to 20 db by changing the values of the external gain resistors. the outputs of the headphone and line driver are protected against overloads. overloads can occur when the outputs are short-circuited between them or to gnd or to v cc . there is also an internal thermal shutdown activated at 150c (typical) and deactivated at 120c (typical). to remove the bulky output dc blocking capacitor and maximize the output swing of the amplifier, the TS4604 embeds a low noise internal negative supply. all amplifiers are supplied between a positive voltage +vp and a negative voltage -vn. with this architecture, the output voltage is centered on 0 v, allowing the swing of the output voltage between the positive and negative rail, as depicted in figure 45 . both the line driver and headset driver use this architecture. figure 45. TS4604 voltage f or one channel note: the pvsshp and pvssld voltages are genera ted internally by the internal negative supply. to avoid damage to the TS4604, do not connect an external power supply on the pvsshp and pvssld pins . 0 v vreg vreg vcc +v p -vn - + +vp -vn in+ in- o u t neg a tive su pply am061 3 9
application information TS4604 18/31 doc id 17913 rev 1 6.2 use of ceramic capacitors we advise using ceramic capacitors for the decoup ling, flying or tank capacitors because of their low esr properties. the rated voltage of the ceramic capacitor, however, is an important parameter to take into consideration. a 1 f/6.3 v capacitor used at 4.8 v dc typically loses about 40% of its value. in fact, with a 4.8 v power supply voltage, the decoupling value is about 0.6 f instead of 1 f. because the decoupling capacitor influences the thd+n in the medium-to-high frequency region, this capacitor variation becomes decisive. in addition, less decoupling means higher overshoots, which can be problematic if they reac h the power supply's amr value (5.5 v). this is why it is recommend to use a 1 f/10 v/x5r or a 2.2 f/6.3 v/x5r, or a new kind of ceramic capacitor with a low dc bias variation rated at 6.3 v. if a 1 f/10 v ceramic capacitor is used, at 4.8 v the capacitance will be 0.82 f. if a 2.2 f/6.3 v ceramic capacitor is used, at 4.8 v the capacitance will be 1.1 f. 6.3 flying and tank capacitor fo r the internal negative supply the TS4604 embeds two independent internal negative supplies as shown in figure 1 . each of them requires two capacitors to work properly (a flying and a tank capacitor). the internal negative supply capacitor must be correctly selected to generate an efficient negative voltage. two flying capacitors (chp and cld) of 1 f each with low esr are recommended for internal negative power supply operation. chp between pins 8 and 21. cld between pins 7 and 22. two tank capacitors (cpvss_hp and cpvss_ld) of 1 f each with low esr are recommended for internal negative power supply energy storage. cpvss_hp between pin 9 and ground. cpvss_ld between pin 6 and ground. an x5r dielectric for capacitor tolerance should be used. in order to take into consideration the c/ v variation of this type of dielectric (see section 6.2 above), we also recommend: a 10 v dc rating voltage for 4.8 v power supply operation. a 6.3 v dc rating operation for 3.3 v power supply operation. these capacitors must be placed as close as possible to th e TS4604 to minimize parasitic inductance and resistance that have a negative impact on the audio performance. 6.4 power supply decoupling capacitor (cs) a 1 f decoupling capacitor (cs) with low esr is mandatory for the positive power supply x5r dielectric for capacitor tolerance behavior. in order to take into consideration the c/ v variation of this type of dielectric (see section 6.2 above), it is also recommended to use: a 10 v dc rating voltage for 4.8 v power supply operation. a 6.3 v dc rating operation for 3.3 v power supply operation.
TS4604 application information doc id 17913 rev 1 19/31 these capacitors must be placed as close as possible to th e TS4604 to minimize parasitic inductance and resistance that have a negative impact on the audio performance. 6.5 input coupling capacitor (cin) an input coupling capacitor (cin) might be used for TS4604 operation to block any dc component of the audio signal. cin starts to have an effect in the low frequen cy region. cin forms with rin a high-pass filter with a -3 db cut-off frequency. example a differential input gain as shown in figure 46 on page 20 with the gain equalling 0 db (rin = 10 k , rfd = 10 k ) and an input capacitor of 2.2 f gives: the high-pass filter has a -3 db cut-off frequency at 7.2 hz in this case. 6.6 range of the gain setting resistors the TS4604 can be use in different configurations, as shown in figures 46 , 47 and 48 . the gain is given by the external resistors rfd divided by rin. the feedback resistor rfd does not exceed 100 k for closed-loop stability reasons. ta bl e 7 gives the recommended resistor values and the gain for different types of application. fc 3db ? () 1 2. rin cin ?? ------------------------------------------ hz () = fc 1 2. 10000 2.2e10 6 ? ?? --------------------------------------------------------------- - 7.2hz == table 7. recommended resistors values rin rfd differential gain inverting gain non-inverting gain 10 k 10 k 0 db 0 db 6 db 10 k 20 k 6 db 6 db 10 db 10 k 50 k 14 db 14 db 16 db 4.7 k 47 k 20 db 20 db 21 db 10 k 100 k 20 db 20 db 21 db
application information TS4604 20/31 doc id 17913 rev 1 figure 46. example of a TS4604 differential input figure 47. example of a TS4604 inverting input figure 48. example of a TS4604 non-inverting input rin rin rfd cin cin rfd vo u t vin- vin+ am06140 rin rfd cin vo u t vin- am06141 rin rfd cin rx cin vo u t vin+ am06142
TS4604 application information doc id 17913 rev 1 21/31 6.7 performance of cmrr when the TS4604 is used in differential mode ( figure 46 ), because of the resistor matching the cmrr can have important variations. to minimize these variations, we recommend using the same kind of resistor (same tolerance). the following equation is valid for frequencies ranging from dc to about khz. the equation is simplified by neglecting the r2 terms. r is the tolerance value as a percentage. it is extremely important to correctly match the resistors to obtain a good cmrr. all the tests have been performed with resistors with a tolerance value of 0.1%. example: with r = 1% the minimum cmrr would be 34 db. with r = 0.1% the minimum cmrr would be 54 db. 6.8 internal and external undervoltage detection the TS4604 embeds two uvlos: one internal and one external. 6.8.1 internal uvlo the internal uvlo monitors the power supply via pins pvcc_hp (20) and pvcc_ld(23). the threshold is set to 2.8 v with a 200 mv hysteresis. if the power supply decreases to 2.6 v, the TS4604 switches to standby mode. to switch the device on again, the power supply voltage must increase to above 2.8 v. refer to ta b l e 4 for the tolerance of the uvlo voltage. 6.8.2 external uvlo the ex_uvp pin (25) is an external undervoltage detection input that can be used to start up or shutdown the TS4604 by applying the correct voltage value. a 1.25 v internal precision voltage is us ed as a reference to monitor the voltage applied to the ex_upvp pin. to set a desired shutdown threshold and hysteresis for the application, a resistor divider can be calculated as follows. with the conditio n r3>>r1//r2. cmrr 20 100 4 r ----------- - 1 rfd rin --------- - + ?? ?? db () log ? vuvp 1.25v r1 r2 + () r1 -------------------------- - ? = vhyst 5 ar3 r2 r1 ------- - 1 + ?? ?? ? ?
application information TS4604 22/31 doc id 17913 rev 1 for example, to obtain vuvp = 3.3 v with a hysteresis of 200 mv: r1 = 1 k r2 = 1.6 k r3 = 15 k figure 49. external uvlo figure 50. hysteresis of the external uvlo when the external sense voltage (esv) increases, the TS4604 stays in standby mode until the euvp pin reaches 1.25 v (voltage across the divider r1, r2). at this point, the TS4604 starts, as does the internal 5 a current source connected to the euvp pin. thanks to this 5 a current, a voltage drop is created across the r3 resistor. 15 k r 3 1.6 k r2 1 k r1 preci s ion ba nd g a p 1.25 v + 5 a t s 4604 - extern a l s en s e volt a ge vcc am0614 3 icc extern a l s en s e volt a ge vhy s t v u vp am06144
TS4604 application information doc id 17913 rev 1 23/31 to switch the TS4604 back to standby, the voltage across the divider r1, r2 has to be lower than 1.25 v - vhyst r1/(r1 + r2). the esv can be an external voltage or simply the power supply voltage pvcc_ld/hd. 6.9 2nd order butterworth low-pass filter the TS4604 can also be configured as a low-pass filter to be driven directly by a dac output. it can be used, for example, as a 2nd order low-pass filter, with either a differential input or a single-ended input. figure 51 and figure 52 depict these two kinds of application and represent a multiple feedback 2nd order low-pass filter. an ac-coupling capacitor should be added to block any dc component from the source, which helps to reduce the output dc offset to a minimum. example 2nd-order multi-feedback filter in differential mode figure 53 shows a filter in differential mode with a cut-off frequency at 30 khz (configured as per the values in ta bl e 8 , which proposes various filter op tions using a differential input). figure 51. multi-feedback filter with differential input figure 52. multi-feedback filter with single- ended input rin rin rfd cin cin rfd r1 r1 c1 c1 c2 vo u t vin- vin+ am06145 rin rfd cin r1 c1 c2 vo u t vin- am06146
application information TS4604 24/31 doc id 17913 rev 1 figure 53. frequency response 2nd-order mfb filter 6.10 esd protection and compliance to provide excellent esd immunity, an audio line ipad (a) (stmicroelectronics reference emif04-ear02m8) can be added at the output of the TS4604 ( figure 54 ). by adding the ipad, the TS4604 complies with the standard iec 61000-4-2 level 4 on the external pins. out_hpl and out_hpr for the headphone driver. out_ldl and out_ldr for the line driver. 1 10 100 1000 10000 100000 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 r1 = rin = 10k , rfd = 24k , c1 = 680pf, c2 = 120pf, gain (db) frequency (hz) table 8. recommended values for 2nd order low-pass filter low-pass filter rin r1 rfd c1 c2 25 khz 10 k 10 k 15 k 1 nf 200 pf 30 khz 10 k 10 k 24 k 680 pf 120 pf a. copyright st microelectronics.
TS4604 application information doc id 17913 rev 1 25/31 figure 54. TS4604 with ipad for esd immunity 6.11 pop-&-click circuitry thanks to the internal negative supply the headphone and line driver outputs are referred to ground without the need for bulky in-series capacitors. as a result, the pop created by these bulky capacitors is eliminated. in addition, the TS4604 includes a pop-&-click circuitry that suppresses any residual pop on the outputs, thus enabling the outputs to be virtually pop-&- click-free. 6.12 start-up phase to further improve the pop-&-click performance, two important points must be taken into account during the start-up phase. input capacitor during the start up phase, as long as the ac input coupling capacitors are not fully charged, we suggested to remain the en_ld and en_hp and/or ext_uvp pin low. the constant time for an rc filter is given by: we can consider that the inpu t capacitor cin will be charged at 95% of its maximum value at: out_r out_l a1 a2 b2 gnd ipad gnd gnd + - - + inr- inr+ inl- inl+ out_r out_l t s 4604 c1 c2 am06147 rin cin ? = t3 =
application information TS4604 26/31 doc id 17913 rev 1 with a gain set at g = 0 db, a rin = 10 k and cin = 2.2 f, to charge cin to 95% of its final value, 66 ms are necessary. wake-up time of the TS4604 the TS4604 needs 30 ms to become fully operational (see ta bl e 5 and ta b l e 6 ). the total startup sequence with the settings described being 66 ms, and since the TS4604 needs 30 ms to wake up, the enable pin for the line driver and/or headphone can be set high 36 ms after the power supply has reached its normal value ( figure 55 ). with a lower input capacitance, the startup phase is quicker. figure 55. power-up/down sequence 6.13 layout recommendations particular attention must be given to the correct layout of the pcb traces and wires between the amplifier, load and power supply. the power and ground traces are critical si nce they must provide adequate energy and grounding for all circuits. good practice is to use short and wide pcb traces to minimize voltage drops and parasitic inductance. proper grounding guidelines help improve audio performances, minimize crosstalk between channels, and prevent switching noise from coupling into the audio signal. it is also recommended to use a large-area and multi-via ground plane to minimize parasitic impedance. connect all the v cc tracks (pvccld and pvcchp) to one point one the board. the copper traces that connect the output pins to the load and supply pins should be as wide as possible to minimize the trace resistances. the gain setting resistors must be placed as close as possible to the input in order to minimize the parasitic capacitors on these inputs pins. su pply en_xx 3 6 m s vo u t 3 0 m s su pply r a mp 66 m s am0614 8
TS4604 package information doc id 17913 rev 1 27/31 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.
package information TS4604 28/31 doc id 17913 rev 1 7.1 tssop28 package figure 56. tssop28 pitch 0.65 mm mechanical drawing table 9. tssop28 pitch 0.65 mm mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a1.200.047 a1 0.05 0.15 0.002 0.006 a2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.011 c 0.09 0.20 0.003 0.008 d 9.60 9.70 9.80 0.378 0.382 0.386 e 6.20 6.40 6.60 0.244 0.252 0.260 e1 4.30 4.40 4.50 0.170 0.173 0.177 e 0.65 0.026 l 0.45 0.60 0.75 0.018 0.024 0.030 l1 1.00 0.040 k0 8 aaa 0.10 0.004
TS4604 ordering information doc id 17913 rev 1 29/31 8 ordering information table 10. order codes part number temperature range gain package marking TS4604ipt -40c, +85c external tssop28 4604
revision history TS4604 30/31 doc id 17913 rev 1 9 revision history table 11. document revision history date revision changes 27-oct-2010 1 initial release.
TS4604 doc id 17913 rev 1 31/31 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

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