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| TS4995 1.2 W fully differential audio power amplifier with selectable standby and 6 dB fixed gain Features Differential inputs 90 dB PSRR @ 217 Hz with grounded inputs Operates from VCC = 2.5 V to 5.5 V 1.2 W rail-to-rail output power @ VCC=5 V, THD+N=1%, F=1 kHz, with an 8 load 6 dB integrated fixed gain Ultra-low consumption in standby mode (10 nA) Selectable standby mode (active low or active high) Ultra-fast startup time: 10 ms typ. at VCC=3.3 V Available in 9-bump flip chip (300 mm bump diameter) Ultra-low pop and click VO- TS4995 - Flip chip 9 Pin connections (top view) Gnd 7 6 5 VO+ Stdby VIN- Bypass VIN+ 8 1 9 2 VCC 4 3 Stdby Mode Applications Mobile phones (cellular / cordless) PDAs Laptop / notebook computers Portable audio devices The TS4995 features an internal fixed gain at 6dB which reduces the number of external components on the application board. The device is equipped with common mode feedback circuitry allowing outputs to be always biased at VCC/2 regardless of the input common mode voltage. The TS4995 is specifically designed for high quality audio applications such as mobile phones and requires few external components. Description The TS4995 is an audio power amplifier capable of delivering 1.2 W of continuous RMS output power into an 8 load at 5 V. Thanks to its differential inputs, it exhibits outstanding noise immunity. An external standby mode control reduces the supply current to less than 10 nA. A STBY MODE pin allows the standby pin to be active high or low. An internal thermal shutdown protection is also provided, making the device capable of sustaining short-circuits. March 2008 Rev 3 1/26 www.st.com 26 Contents TS4995 Contents 1 2 3 4 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 Typical application schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 17 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Wake-up time tWU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Shutdown time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Pop performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5 6 7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2/26 TS4995 Absolute maximum ratings and operating conditions 1 Table 1. Symbol VCC Vin Toper Tstg Tj Rthja Pdiss ESD Absolute maximum ratings and operating conditions Absolute maximum ratings (AMR) Parameter Supply voltage (1) Value 6 GND to VCC -40 to + 85 -65 to +150 150 200 Internally limited 200 Unit V V C C C C/W W V kV mA C Input voltage (2) Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient (3) Power dissipation MM: machine model (4) HBM: human body model (5) 1.5 200 260 Latch-up Latch-up immunity Lead temperature (soldering, 10sec) 1. All voltage values are measured with respect to the ground pin. 2. The magnitude of input signal must never exceed VCC + 0.3 V / GND - 0.3 V. 3. The device is protected in case of over temperature by a thermal shutdown activated at 150 C. 4. Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ), done for all couples of pin combinations with other pins floating. 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 combinations with other pins floating. Table 2. Symbol VCC VSM Operating conditions Parameter Supply voltage Standby mode voltage input: Standby Active LOW Standby Active HIGH Standby voltage input: Device ON (VSM=GND) or Device OFF (VSM=VCC) Device OFF (VSM=GND) or Device ON (VSM=VCC) Thermal shutdown temperature Load resistor Thermal resistance junction to ambient Value 2.5 to 5.5 VSM=GND VSM=VCC 1.5 VSTBY VCC GND VSTBY 0.4 (1) 150 4 100 Unit V V VSTBY TSD RL Rthja V C C/W 1. The minimum current consumption (ISTBY) is guaranteed when VSTB Y= GND or VCC (the supply rails) for the whole temperature range. 3/26 Typical application schematics TS4995 2 Typical application schematics Table 3. External component descriptions Functional description Supply bypass capacitor that provides power supply filtering. Bypass capacitor that provides half supply filtering. Optional input capacitor that forms a high pass filter together with Rin. (Fcl = 1 / (2 x x Rin x Cin) Component Cs Cb Cin Figure 1. Typical application VCC Cs1 1uF 2 TS4995 FlipChip Optional VinP1 330nF Cin2 P2 Vin+ 330nF 8 BYP ASS Cin1 3 VinVo- Vcc TS4995 7 1 Vin+ + BIAS STBY STDBY STDBY MODE GND Vo+ 5 8 Ohms 1uF Cbypass1 4 9 STDBY / Operation VCC 3 1 3 4/26 1 STDBY MODE 2 2 6 TS4995 Electrical characteristics 3 Table 4. Symbol ICC ISTBY Voo VIC Po THD + N PSRRIG Electrical characteristics VCC = +5V, GND = 0V, Tamb = 25C (unless otherwise specified) Parameter Supply current Standby current Differential output offset voltage Input common mode voltage Output power Total harmonic distortion + noise Power supply rejection ratio with inputs grounded(1) THD = 1% Max, F= 1kHz, RL = 8 Po = 850mW rms, 20Hz F 20kHz, RL = 8 F = 217Hz, R = 8, Cin = 4.7F, Cb =1F Vripple = 200mVPP F = 217Hz, RL = 8, Cin = 4.7F, Cb =1F Vic = 200mVPP A-weighted filter RL = 8, THD +N < 0.7%, 20Hz F 20kHz RL = 8 20Hz F 20kHz, RL = 8 Unweighted A-weighted Unweighted, standby A-weighted, standby 15 5.5 Cb =1F 75(2) Test conditions No input signal, no load No input signal, VSTBY = VSM = GND, RL = 8 No input signal, VSTBY = VSM = VCC, RL = 8 No input signal, RL = 8 0 0.8 1.2 0.5 90 60 Min. Typ. Max. Unit 4 10 0.1 7 1000 10 4.5 mA nA mV V W % dB dB dB MHz CMRR Common mode rejection ratio SNR GBP Signal-to-noise ratio Gain bandwidth product 100 2 11 7 3.5 1.5 20 6 15 25 6.5 VN Output voltage noise VRMS Zin tWU Input impedance Gain mismatch Wake-up time(3) k dB ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Guaranteed by design and evaluation. 3. Transition time from standby mode to fully operational amplifier. 5/26 Electrical characteristics Table 5. Symbol ICC ISTBY Voo VIC Po THD + N PSRRIG TS4995 VCC = +3.3V (all electrical values are guaranteed with correlation measurements at 2.6V and 5V), GND = 0V, Tamb = 25C (unless otherwise specified) Parameter Supply current Standby current Differential output offset voltage Input common mode voltage Output power Total harmonic distortion + noise Power supply rejection ratio with inputs grounded(1) THD = 1% max, F= 1kHz, RL = 8 Po = 300mW rms, 20Hz F 20kHz, RL = 8 F = 217Hz, R = 8, Cin = 4.7F, Cb =1F Vripple = 200mVPP F = 217Hz, RL = 8, Cin = 4.7F, Cb =1F Vic = 200mVPP A-weighted filter RL = 8, THD +N < 0.7%, 20Hz F 20kHz RL = 8 20Hz F 20kHz, RL = 8 Unweighted A weighted Unweighted, standby A weighted, standby 15 5.5 Cb =1F 75(2) Test conditions No input signal, no load No input signal, VSTBY = VSM = GND, RL = 8 No input signal, VSTBY = VSM = VCC, RL = 8 No input signal, RL = 8 0.4 300 500 0.5 90 60 Min. Typ. Max. Unit 3 10 0.1 7 1000 10 2.3 mA nA mV V mW % dB dB dB MHz CMRR Common mode rejection ratio SNR GBP Signal-to-noise ratio Gain bandwidth product 100 2 11 7 3.5 1.5 20 6 10 25 6.5 VN Output voltage noise VRMS Zin tWU Input impedance Gain mismatch Wake-up time(3) k dB ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Guaranteed by design and evaluation. 3. Transition time from standby mode to fully operational amplifier. 6/26 TS4995 Table 6. Symbol ICC ISTBY Voo VIC Po THD + N PSRRIG CMRR SNR GBP Electrical characteristics VCC = +2.6V, GND = 0V, Tamb = 25C (unless otherwise specified) Parameter Supply current Standby current Differential output offset voltage Input common mode voltage Output power Total harmonic distortion + noise THD = 1% max, F= 1kHz, RL = 8 Po = 225mW rms, 20Hz F 20kHz, RL = 8 75(2) Test conditions No input signal, no load No input signal, VSTBY = VSM = GND, RL = 8 No input signal, VSTBY = VSM = VCC, RL = 8 No input signal, RL = 8 0.6 200 300 0.5 90 60 Min. Typ. Max. 3 10 0.1 7 1000 10 1.5 Unit mA nA mV V mW % dB dB dB MHz Power supply rejection ratio F = 217Hz, R = 8, Cin = 4.7F, Cb =1F with inputs grounded(1) Vripple = 200mVPP Common mode rejection ratio Signal-to-noise ratio Gain bandwidth product F = 217Hz, RL = 8, Cin = 4.7F, Cb =1F Vic = 200mVPP A-weighted filter RL = 8, THD +N < 0.7%, 20Hz F 20kHz RL = 8 20Hz F 20kHz, RL = 8 Unweighted A weighted Unweighted, standby A weighted, standby 100 2 11 7 3.5 1.5 15 5.5 20 6 10 25 6.5 VN Output voltage noise VRMS Zin tWU Input impedance Gain mismatch Wake-up time(3) Cb =1F k dB ms 1. Dynamic measurements - 20*log(rms(Vout)/rms (Vripple)). Vripple is the super-imposed sinus signal relative to VCC. 2. Guaranteed by design and evaluation. 3. Transition time from standby mode to fully operational amplifier. 7/26 Electrical characteristics TS4995 Figure 2. 10 THD+N vs. output power Figure 3. 10 THD+N vs. output power Vcc=2.6V THD + N (%) THD + N (%) RL = 8 G = 6dB F = 20Hz Cb = 1F 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V RL = 8 G = 6dB F = 20Hz Cb = 0 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V Vcc=2.6V 0.1 0.1 0.01 1E-3 0.01 0.1 Output power (W) 1 0.01 1E-3 0.01 0.1 Output power (W) 1 Figure 4. 10 THD+N vs. output power Figure 5. 10 THD+N vs. output power THD + N (%) THD + N (%) RL = 16 G = 6dB F = 20Hz Cb = 1F 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V RL = 16 G = 6dB F = 20Hz Cb = 0 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V Vcc=2.6V Vcc=2.6V 0.1 0.1 0.01 1E-3 0.01 0.1 Output power (W) 1 0.01 1E-3 0.01 0.1 Output power (W) 1 Figure 6. THD+N vs. output power Figure 7. 10 THD+N vs. output power 10 RL = 4 G = 6dB F = 1kHz Cb = 1F BW < 125kHz Tamb = 25C 1 Vcc=2.6V Vcc=5V THD + N (%) THD + N (%) Vcc=3.3V RL = 4 G = 6dB F = 1kHz Cb = 0 BW < 125kHz Tamb = 25C 1 Vcc=5V Vcc=3.3V Vcc=2.6V 0.1 1E-3 0.01 0.1 Output power (W) 1 0.1 1E-3 0.01 0.1 Output power (W) 1 8/26 TS4995 Electrical characteristics Figure 8. 10 THD+N vs. output power Figure 9. 10 THD+N vs. output power Vcc=2.6V THD + N (%) THD + N (%) RL = 8 G = 6dB F = 1kHz Cb = 1F 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V RL = 8 G = 6dB F = 1kHz Cb = 0 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V Vcc=2.6V 0.1 0.1 0.01 1E-3 0.01 0.1 Output power (W) 1 0.01 1E-3 0.01 0.1 Output power (W) 1 Figure 10. THD+N vs. output power 10 RL = 16 G = 6dB F = 1kHz Cb = 1F 1 BW < 125kHz Tamb = 25C Vcc=5V Figure 11. THD+N vs. output power 10 RL = 16 G = 6dB F = 1kHz Cb = 0 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V THD + N (%) Vcc=2.6V 0.1 Vcc=2.6V 0.1 0.01 1E-3 0.01 0.1 1 0.01 1E-3 0.01 0.1 1 Output power (W) Output power (W) Figure 12. THD+N vs. output power 10 RL = 4 G = 6dB F = 20kHz Cb = 1F BW < 125kHz Tamb = 25C 1 Vcc=5V Figure 13. THD+N vs. output power 10 RL = 4 G = 6dB F = 20kHz Cb = 0 BW < 125kHz Tamb = 25C 1 Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V THD + N (%) Vcc=2.6V Vcc=2.6V 0.1 1E-3 0.01 0.1 Output power (W) 1 0.1 1E-3 0.01 0.1 Output power (W) 1 9/26 Electrical characteristics TS4995 Figure 14. THD+N vs. output power 10 RL = 8 G = 6dB F = 20kHz Cb = 1F BW < 125kHz Tamb = 25C Vcc=5V Figure 15. THD+N vs. output power 10 RL = 8 G = 6dB F = 20kHz Cb = 0 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V Vcc=2.6V THD + N (%) 1 Vcc=2.6V 1 0.1 1E-3 0.01 0.1 Output power (W) 0.1 1 1E-3 0.01 0.1 Output power (W) 1 Figure 16. THD+N vs. output power 10 RL = 16 G = 6dB F = 20kHz Cb = 1F 1 BW < 125kHz Tamb = 25C Vcc=5V Figure 17. THD+N vs. output power 10 RL = 16 G = 6dB F = 20kHz Cb = 0 1 BW < 125kHz Tamb = 25C Vcc=5V Vcc=3.3V THD + N (%) Vcc=3.3V THD + N (%) Vcc=2.6V 0.1 Vcc=2.6V 0.1 0.01 1E-3 0.01 0.1 1 0.01 1E-3 0.01 0.1 1 Output power (W) Output power (W) Figure 18. THD+N vs. frequency 10 RL = 4 G = 6dB Cb = 1F BW < 125kHz Tamb = 25C Figure 19. THD+N vs. frequency 10 RL = 4 G = 6dB Cb = 0 BW < 125kHz Tamb = 25C Vcc=5V, Po=1000mW Vcc=2.6V, Po=280mW 1 THD + N (%) Vcc=5V, Po=1000mW Vcc=2.6V, Po=280mW 1 THD + N (%) 0.1 Vcc=3.3V, Po=500mW 0.1 Vcc=3.3V, Po=500mW 0.01 100 1000 Frequency (Hz) 10000 0.01 100 1000 Frequency (Hz) 10000 10/26 TS4995 Electrical characteristics Figure 20. THD+N vs. frequency 10 RL = 8 G = 6dB Cb = 1F BW < 125kHz Tamb = 25C Figure 21. THD+N vs. frequency 10 RL = 8 G = 6dB Cb = 0 BW < 125kHz Tamb = 25C 1 THD + N (%) Vcc=2.6V, Po=225mW THD + N (%) 1 Vcc=2.6V, Po=225mW Vcc=5V, Po=850mW 0.1 Vcc=3.3V, Po=300mW Vcc=5V, Po=850mW 0.1 Vcc=3.3V, Po=300mW 0.01 100 1000 Frequency (Hz) 10000 0.01 100 1000 Frequency (Hz) 10000 Figure 22. THD+N vs. frequency 10 RL = 16 G = 6dB Cb = 1F BW < 125kHz Tamb = 25C Figure 23. THD+N vs. frequency 10 RL = 16 G = 6dB Cb = 0 BW < 125kHz Tamb = 25C Vcc=5V, Po=500mW 1 THD + N (%) 1 THD + N (%) Vcc=5V, Po=500mW Vcc=2.6V, Po=125mW 0.1 Vcc=2.6V, Po=125mW 0.1 Vcc=3.3V, Po=225mW 0.01 100 1000 Frequency (Hz) Vcc=3.3V, Po=225mW 10000 0.01 100 1000 Frequency (Hz) 10000 Figure 24. Output power vs. power supply voltage 10 Figure 25. Output power vs. power supply voltage 2,4 Cb = 1F 2,2 F = 1kHz 2,0 BW < 125 kHz 1,8 Tamb = 25C 1,6 1,4 1,2 1,0 0,8 0,6 0,4 0,2 0,0 2,5 3,0 3,5 4,0 Vcc (V) Output power at 10% THD + N (W) 1 THD + N (%) RL = 16 G = 6dB Cb = 1F BW < 125kHz Tamb = 25C Vcc=5V, Po=500mW 4 8 16 32 4,5 5,0 5,5 Vcc=2.6V, Po=125mW 0.1 Vcc=3.3V, Po=225mW 0.01 100 1000 Frequency (Hz) 10000 11/26 Electrical characteristics TS4995 Figure 26. Output power vs. power supply voltage 2,0 Output power at 1% THD + N (W) Figure 27. Power derating curves Flip-Chip Package Power Dissipation (W) Cb = 1F 1,8 F = 1kHz 1,6 BW < 125 kHz Tamb = 25C 1,4 1,2 1,0 0,8 0,6 0,4 0,2 0,0 2,5 3,0 3,5 4,0 1.2 1.0 0.8 0.6 0.4 0.2 0.0 No Heat sink Heat sink surface 100mm 2 4 8 16 32 4,5 5,0 5,5 0 25 50 75 100 125 Ambiant Temperature (C) Vcc (V) Figure 28. Output power vs. load resistance 2000 1800 1600 Output power (W) Figure 29. Power dissipation vs. output power 1.4 Vcc=5.5V Vcc=5V Vcc=4.5V Vcc=4V Power Dissipation (W) 1400 1200 1000 800 600 400 200 0 4 6 8 THD+N = 1% F = 1kHz Cb = 1F BW < 125kHz Tamb = 25C Vcc=3.3V Vcc=2.6V Vcc=5V 1.2 F=1kHz THD+N<1% 1.0 0.8 0.6 0.4 0.2 RL=16 RL=4 RL=8 10 12 14 16 18 20 22 24 26 28 30 32 Load Resistance () 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Output Power (W) 1.4 1.6 Figure 30. Power dissipation vs. output power Figure 31. Power dissipation vs. output power 0.6 Vcc=3.3V F=1kHz 0.5 THD+N<1% Power Dissipation (W) 0.40 0.35 RL=4 Vcc=2.6V F=1kHz THD+N<1% RL=4 0.4 0.3 0.2 RL=8 0.1 RL=16 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Power Dissipation (W) 0.30 0.25 0.20 0.15 RL=8 0.10 0.05 0.00 0.0 RL=16 0.1 0.2 Output Power (W) 0.3 0.4 Output Power (W) 12/26 TS4995 Electrical characteristics Figure 32. PSSR vs. frequency 0 -10 -20 -30 -40 PSRR (dB) Figure 33. PSSR vs. frequency 0 -50 -60 -70 -80 -90 -100 -110 20 PSRR (dB) Vcc = 2.6V Vripple = 200mVpp RL 8 G = 6dB, Cin = 4.7F Inputs grounded Tamb = 25C -10 -20 -30 -40 Cb=0 -50 -60 -70 -80 -90 -100 Vcc = 2.6V Vripple = 200mVpp RL 8 G = 6dB Inputs floating Tamb = 25C Cb=0 Cb=1F, 0.47F, 0.1F Cb=1F, 0.47F, 0.1F 100 1000 Frequency (Hz) 100 1000 Frequency (Hz) 10000 -110 20 10000 Figure 34. PSSR vs. frequency 0 -10 -20 -30 -40 PSRR (dB) Figure 35. PSSR vs. frequency 0 -50 -60 -70 -80 -90 -100 -110 20 PSRR (dB) Vcc = 3.3V Vripple = 200mVpp RL 8 G = 6dB, Cin = 4.7F Inputs grounded Tamb = 25C -10 -20 -30 -40 Cb=0 -50 -60 -70 -80 -90 -100 Vcc = 3.3V Vripple = 200mVpp RL 8 G = 6dB Inputs floating Tamb = 25C Cb=0 Cb=1F, 0.47F, 0.1F Cb=1F, 0.47F, 0.1F 100 1000 Frequency (Hz) 10000 -110 20 100 1000 Frequency (Hz) 10000 Figure 36. PSSR vs. frequency 0 -10 -20 -30 -40 PSRR (dB) Figure 37. PSSR vs. frequency 0 -50 -60 -70 -80 -90 -100 -110 20 PSRR (dB) Vcc = 5V Vripple = 200mVpp RL 8 G = 6dB, Cin = 4.7F Inputs grounded Tamb = 25C -10 -20 -30 Cb=0 -40 -50 -60 -70 -80 -90 -100 Vcc = 5V Vripple = 200mVpp RL 8 G = 6dB Inputs floating Tamb = 25C Cb=0 Cb=1F, 0.47F, 0.1F Cb=1, 0.47, 0.1F 100 1000 Frequency (Hz) 10000 -110 20 100 1000 Frequency (Hz) 10000 13/26 Electrical characteristics TS4995 Figure 38. PSSR vs. common mode input voltage 20 Figure 39. PSSR vs. common mode input voltage 20 Vcc = 5V Vripple = 200mVpp 0 F = 217Hz G = 6dB -20 RL 8 Tamb = 25C PSRR (dB) -40 Cb=0 -60 -80 -100 0 1 PSRR (dB) Cb=0.1F Cb=0.47F Cb=1F Vcc = 3.3V Vripple = 200mVpp 0 F = 217Hz G = 6dB -20 RL 8 Tamb = 25C -40 Cb=0 -60 -80 -100 Cb=0.1F Cb=0.47F Cb=1F 2 3 4 5 0.0 0.6 1.2 1.8 2.4 3.0 Common Mode Input Voltage (V) Common Mode Input Voltage (V) Figure 40. PSSR vs. common mode input voltage 20 Figure 41. CMRR vs. frequency -40 Cb=0 -60 -80 -100 0.0 0.5 1.0 1.5 2.0 2.5 Cb=0.1F Cb=0.47F Cb=1F CMRR (dB) Vcc = 2.6V Vripple = 200mVpp 0 F = 217Hz G = 6dB -20 RL 8 Tamb = 25C PSRR (dB) 0 -10 -20 -30 -40 -50 -60 -70 -80 100 1000 Frequency (dB) Vcc = 5V G = 6dB Vic = 200mVpp RL 8 Cin = 470F Tamb = 25C Cb=1F Cb=0.47F Cb=0.1F Cb=0 10000 Common Mode Input Voltage (V) Figure 42. CMRR vs. frequency 0 -10 -20 CMRR (dB) Figure 43. CMRR vs. frequency 0 -40 -50 -60 -70 -80 100 CMRR (dB) -30 Vcc = 3.3V G = 6dB Vic = 200mVpp RL 8 Cin = 470F Tamb = 25C -10 Cb=1F Cb=0.47F Cb=0.1F Cb=0 -20 -30 -40 -50 -60 -70 1000 Frequency (dB) Vcc = 2.6V G = 6dB Vic = 200mVpp RL 8 Cin = 470F Tamb = 25C Cb=1F Cb=0.47F Cb=0.1F Cb=0 10000 -80 100 1000 Frequency (dB) 10000 14/26 TS4995 Electrical characteristics Figure 44. CMRR vs. common mode input voltage 20 Figure 45. CMRR vs. common mode input voltage 20 Vic = 200mVpp 10 F = 217Hz 0 Cb = 1F RL 8 -10 Tamb = 25C -20 CMRR (dB) Vic = 200mVpp 10 F = 217Hz 0 Cb = 0 RL 8 -10 Tamb = 25C -20 CMRR (dB) -30 -40 -50 -60 -70 -80 -90 0.0 0.5 Vcc=2.6V Vcc=5V -30 -40 -50 -60 Vcc=2.6V Vcc=5V Vcc=3.3V -70 -80 Vcc=3.3V 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -90 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Common Mode Input Voltage (V) Common Mode Input Voltage (V) Figure 46. Current consumption vs. power supply voltage 5.0 Figure 47. Differential DC output voltage vs. common mode input voltage G = 6dB Tamb = 25C No loads 4.5 Tamb = 25C Current consumption (mA) 0.1 4.0 3.5 0.01 2.5 2.0 1.5 1.0 0.5 0.0 1E-5 0 1 2 3 4 5 6 Power Supply Voltage (V) |Voo| (dB) Vcc=2.6V Vcc=3.3V 3.0 1E-3 Vcc=5V 1E-4 0 1 2 3 4 5 Common Mode Input Voltage (V) Figure 48. Current consumption vs. standby voltage 4.0 3.5 Current Consumption (mA) Figure 49. Current consumption vs. standby voltage 4.0 3.5 Current Consumption (mA) 3.0 2.5 Standby mode=0V 3.0 Standby mode=0V 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 Vcc = 3.3V No load Tamb = 25C 2.8 3.2 Standby mode=3.3V Standby mode=5V 2.0 1.5 1.0 0.5 0.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Vcc = 5V No load Tamb = 25C 4.0 4.5 5.0 Standby Voltage (V) Standby Voltage (V) 15/26 Electrical characteristics TS4995 Figure 50. Current consumption vs. standby voltage 4.0 3.5 Current Consumption (mA) Figure 51. Frequency response 8 7 6 Standby mode=0V Gain (dB) Cin=4.7F 3.0 2.5 2.0 1.5 1.0 0.5 Vcc = 2.6V No load Tamb = 25C 5 4 3 2 1 0 20 100 1000 Frequency (Hz) Standby mode=2.6V Cin=330nF Vcc = 5V Gain = 6dB ZL = 8 + 500pF Tamb = 25C 10000 20k 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 Standby Voltage (V) Figure 52. Frequency response 8 7 6 5 Gain (dB) Figure 53. Frequency response 8 Cin=4.7F 7 6 5 Gain (dB) Cin=4.7F 4 3 2 1 0 20 Cin=330nF 4 3 2 1 0 20 Cin=330nF Vcc = 3.3V Gain = 6dB ZL = 8 + 500pF Tamb = 25C 100 1000 Frequency (Hz) Vcc = 2.6V Gain = 6dB ZL = 8 + 500pF Tamb = 25C 100 1000 Frequency (Hz) 10000 20k 10000 20k Figure 54. SNR vs. power supply voltage with Figure 55. SNR vs. power supply voltage with unweighted filter A-weighted filter 120 118 Signal to Noise Ratio (dB) 114 112 110 108 106 104 102 Signal to Noise Ratio (dB) 116 F = 1kHz G = 6dB Cb = 1F THD + N < 0.7% Tamb = 25C 120 118 116 114 112 110 108 106 104 102 RL=16 F = 1kHz G = 6dB Cb = 1F THD + N < 0.7% Tamb = 25C RL=8 RL=8 RL=16 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Power Supply Voltage (V) Power Supply Voltage (V) 16/26 TS4995 Application information 4 4.1 Application information Differential configuration principle The TS4995 is a monolithic full-differential input/ output power amplifier with fixed +6 dB gain. The TS4995 also includes a common mode feedback loop that controls the output bias value to average it at VCC/2 for any DC common mode input voltage. This allows maximum output voltage swing, and therefore, to maximize the output power. Moreover, as the load is connected differentially instead of single-ended, output power is four times higher for the same power supply voltage. The advantages of a full-differential amplifier are: Very high PSRR (power supply rejection ratio) High common mode noise rejection Virtually no pop and click 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 due to common mode feedback loop In theory, the filtering of the internal bias by an external bypass capacitor is not necessary. However, to reach maximum performance in all tolerance situations, it is recommended to keep this option. 4.2 Common mode feedback loop limitations As explained previously, the common mode feedback loop allows the output DC bias voltage to be averaged at VCC/2 for any DC common mode bias input voltage. Due to the VIC limitation of the input stage (see Table 4 on page 5), the common mode feedback loop can fulfil its role only within the defined range. 4.3 Low frequency response The input coupling capacitors block the DC part of the input signal at the amplifier inputs. Cin and Rin form a first-order high pass filter with -3 dB cut-off frequency. FCL = 1 2 x x Rin x Cin (Hz) Note: The input impedance for the TS4995 is typically 20k and there is tolerance around this value. From Figure 56, you can easily establish the Cin value required for a -3 dB cut-off frequency. 17/26 Application information Figure 56. -3 dB lower cut-off frequency vs. input capacitance TS4995 All gain setting Tamb=25C Low -3dB Cut Off Frequency (Hz) 100 Minimum Input Impedance Typical Input Impedance 10 Maximum Input Impedance 0.1 0.5 Input Capacitor Cin (F) 1 4.4 Power dissipation and efficiency Assumptions: Load voltage and current are sinusoidal (Vout and Iout) Supply voltage is a pure DC source (VCC) The output voltage is: V out = V peak sint (V) and V out I out = ------------ (A) RL and V peak 2 P out = -------------------- (W) 2R L Therefore, the average current delivered by the supply voltage is: Equation 1 V peak Icc AVG = 2 ---------------- (A) R L The power delivered by the supply voltage is: Equation 2 Psupply = VCC IccAVG (W) 18/26 TS4995 Therefore, the power dissipated by each amplifier is: Pdiss = Psupply - Pout (W) 2 2V CC P diss = ---------------------- P out - P out RL Application information and the maximum value is obtained when: Pdiss -------------------- = 0 P out and its value is: Equation 3 Pdiss max = 2 Vcc 2 2RL (W) Note: This maximum value is only dependent on the power supply voltage and load values. The efficiency is the ratio between the output power and the power supply: Equation 4 P out V peak = ------------------ = -------------------P supply 4V CC The maximum theoretical value is reached when Vpeak = VCC, so: = ---- = 78.5% 4 The maximum die temperature allowable for the TS4995 is 125 C. However, in case of overheating, a thermal shutdown set to 150 C, puts the TS4995 in standby until the temperature of the die is reduced by about 5 C. To calculate the maximum ambient temperature Tamb allowable, you need to know: The power supply voltage, VCC The load resistor value, RL The package type, Rthja Example: VCC=5 V, RL=8 , Rthja-flipchip= 100 C/W (100 mm2 copper heatsink). Using the power dissipation formula given above in Equation 3, this gives a result of: Pdissmax = 633mW Tamb is calculated as follows: Equation 5 T amb = 125 C - R thja x P dissmax Therefore, the maximum allowable value for Tamb is: Tamb = 125-100x0.633=61.7 C 19/26 Application information TS4995 4.5 Decoupling of the circuit Two capacitors are needed to correctly bypass the TS4995: a power supply bypass capacitor CS and a bias voltage bypass capacitor Cb. The CS capacitor has particular influence on the THD+N at high frequencies (above 7 kHz) and an indirect influence on power supply disturbances. With a value for CS of 1 F, one can expect THD+N performance similar to that shown in the datasheet. In the high frequency region, if CS is lower than 1 F, then THD+N increases and disturbances on the power supply rail are less filtered. On the other hand, if CS is greater than 1 F, then those disturbances on the power supply rail are more filtered. The Cb capacitor has an influence on the THD+N at lower frequencies, but also impacts PSRR performance (with grounded input and in the lower frequency region). 4.6 Wake-up time tWU When the standby is released to put the device ON, the bypass capacitor Cb is not charged immediately. Because Cb is directly linked to the bias of the amplifier, the bias will not work properly until the Cb voltage is correct. The time to reach this voltage is called the wake-up time or tWU and is specified in Table 4 on page 5, with Cb=1 F. During the wake-up phase, the TS4995 gain is close to zero. After the wake-up time, the gain is released and set to its nominal value. If Cb has a value different from 1 F, then refer to the graph in Figure 57 to establish the corresponding wake-up time. Figure 57. Startup time vs. bypass capacitor 15 Tamb=25C Vcc=5V Startup Time (ms) 10 5 Vcc=2.6V Vcc=3.3V 0 0.0 0.4 0.8 1.2 1.6 Bypass Capacitor Cb (F) 2.0 20/26 TS4995 Application information 4.7 Shutdown time When the standby command is set, the time required to put the two output stages in high impedance and the internal circuitry in shutdown mode is a few microseconds. Note: In shutdown mode, the Bypass pin and Vin+, Vin- pins are shorted to ground by internal switches. This allows a quick discharge of Cb and Cin. 4.8 Pop performance Due to its fully differential structure, the pop performance of the TS4995 is close to perfect. However, due to mismatching between internal resistors Rin, Rfeed, and external input capacitors Cin, some noise might remain at startup. To eliminate the effect of mismatched components, the TS4995 includes pop reduction circuitry. With this circuitry, the TS4995 is close to zero pop for all possible common applications. In addition, when the TS4995 is in standby mode, due to the high impedance output stage in this configuration, no pop is heard. 4.9 Single-ended input configuration It is possible to use the TS4995 in a single-ended input configuration. However, input coupling capacitors are needed in this configuration. The schematic diagram in Figure 58 shows an example of this configuration. 21/26 Application information Figure 58. Typical single-ended input application VCC TS4995 Cs1 1uF 2 TS4995 FlipChip Ve Cin1 3 VinVo- Vcc TS4995 7 P1 330nF Cin2 1 330nF 8 BYP ASS Vin+ + BIAS STBY STDBY STDBY MODE GND Vo+ 5 8 Ohms 1uF Cbypass1 4 9 STDBY / Operation VCC 3 1 3 22/26 1 STDBY MODE 2 2 6 TS4995 Package information 5 Package information To meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Figure 59. 9-bump flip-chip package mechanical drawing 1.63 mm 0.5mm 0.5mm 0.25mm - - - 1.63 mm - - - - - 600m Die size: 1.63mm x 1.63mm 30m Die height (including bumps): 600m Bumps diameter: 315m 50m Bump diameter before reflow: 300m 10m Bumps height: 250m 40m Die height: 350m 20m Pitch: 500m 50m Coplanarity: 60m max Figure 60. Tape and reel schematics 4 1.5 1 A A Die size Y + 70m 1 8 Die size X + 70m 4 All dimensions are in mm User direction of feed 23/26 Package information Figure 61. Pin out (top view) Gnd VOBypass VIN+ 7 6 5 VO+ Stdby 95 TS4995 Figure 62. Marking (top view) E 8 1 9 2 VCC 4 3 VIN- A94 YWW Stdby Mode - Balls are underneath 24/26 TS4995 Ordering information 6 Ordering information Table 7. Order code Temperature range -40 C to +85 C Package Lead free flip chip 9 Packing Tape & reel Marking 95 Order code TS4995EIJT 7 Revision history Table 8. Date 1-Jun-2006 25-Oct-2006 25-Mar-2008 Document revision history Revision 1 2 3 Final datasheet. Additional information for 4 load. Modified Figure 60: Tape and reel schematics to correct die orientation. Changes 25/26 TS4995 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 herein 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 assumes 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. If 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 whatsoever 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 PARTICULAR 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 MILITARY, 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 whatsoever, 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. (c) 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 26/26 |
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