TS4961T TS4961TIQT TS4961 JESD97 QFN16

Mono class D audio power amplifier with dedicated analog switch Features Audio amplifier standby mode active low Output power:

TS4961T TS4961T Mono class D audio power amplifier with dedicated analog switch Features Audio amplifier standby mode active low Output power: 1.6 W at 4.2 V or 0.75 W at 3.0 V into 4 with 1% THD+N maximum Output power: 0.95 W at 4.2 V or 0.45 W at 3.0 V into 8 with 1% THD+N maximum Adjustable gain via external resistors Low current consumption 2 mA at 3 V Efficiency: 88% typical Signal-to-noise ratio: 85 dB typical PSRR: 63 dB typical at 217 Hz with 6 dB gain PWM base frequency: 250 kHz Low pop and click noise Dual Power SPST with separated control QFN 16 3 x 3 mm Wide operating voltage range from VCC = 2.4 V to 4.3 V Ultra-high off-isolation on analog switch: -80 dB typical from 20 Hz to 20 kHz TS4961TIQT TS4961TIQT pinout Applications Cellular telephones PDAs Notebook PCs Description The audio amplifying gain of the device can be controlled via two external gain-setting resistors. It is designed to operate from 2.4 to 4.3 V, making this device ideal for portable applications. The TS4961T TS4961T is a smart combination of one mono class D audio power amplifier and a high-speed CMOS low-voltage dual power analog SPST. One of the key functions of this device is the switch mode of the various audio signals coming from the codec or baseband through the loudspeaker. It can drive up to 1.6 W into a 4 load and 0.95 W into an 8 load. It achieves an outstanding efficiency of up to 88% typical. September 2008 Rev 1 1/49 www.st.com 49 Contents TS4961T TS4961T Contents 1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 2.2 3 Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1 3.2 4 Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4.1 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.2 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.3 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.4 Wake-up time (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.5 Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.6 Consumption in standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.7 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.8 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 4.9 Examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 4.9.1 4.9.2 4.10 Example 1: dual differential inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Example 2: one differential input plus one single-ended input . . . . . . . . 42 Using the audio amplifier and switch on the same speaker . . . . . . . . . . . 43 5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 2/49 TS4961T TS4961T Absolute maximum ratings and operating conditions 1 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Parameter Value GND to 5.5 Vin Input voltage V GND-0.3V / VCC+0.3V VCCA & VCCS Supply voltage (1) (2) Unit V Toper Operating free-air temperature range -40 to + 85 °C Tstg Storage temperature -65 to +150 °C 150 °C 39 °C/W 5 °C/W Tj Maximum junction temperature Rthja Thermal resistance junction to ambient Rthjc (3) Thermal resistance junction to case Pd Internally limited (4) Power dissipation Human body model (5) 2 kV 200 V 200 100 200 mA Standby pin voltage maximum voltage GND-0.3V / VCC+0.3V V Lead temperature (soldering, 10 sec) 260 °C ESD Machine model Latch-up VSTBY (6) Latch-up immunity of the Class D Amplifier (All Pins) Latch-up immunity of the Analog Switch (Supply Pins) Latch-up immunity of the Analog Switch Supply (I/O Pins) 1. Caution: this device is not protected in the event of abnormal operating conditions, such as short-circuiting between any one output pin and ground, between any one output pin and VCC, and between individual output pins. 2. All voltage values are measured with respect to the ground pin. 3. When mounted on a 4-layers PCB. 4. Exceeding the power derating curves during a long period provokes abnormal operating conditions. 5. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 k resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 6. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5 ). This is done for all couples of connected pin combinations while the other pins are floating. Table 2. Operating conditions for audio amplifier section Symbol VCCA VIC VSTBY RL Parameter Value 2.4 to 4.3 Supply voltage(1) Common mode input voltage range (2) Standby voltage input: (3) Class D amplifier ON Class D amplifier OFF(4) Load resistor Unit V 0.5 to VCC-0.8 V 1.4 VSTBY VCC GND VSTBY 0.4 V 4 1. For VCC from 2.4 V to 2.5 V, the operating temperature range is reduced to 0° C Tamb 70° C. 2. For VCC from 2.4 V to 2.5 V, the common mode input range must be set at VCC/2. 3. Without any signal on VSTBY, the device is in standby. 4. Minimum current consumption is obtained when VSTBY = GND. 3/49 Absolute maximum ratings and operating conditions Table 3. TS4961T TS4961T Operating conditions for analog switch section Symbol Parameter Value Unit VCC Supply voltage 2.4 to 4.3 V Vin Input voltage 0 to VCC V VIC Control input voltage 0 to 4.3 V VO Output voltage 0 to VCC V Table 4. Input rise and fall time control input VCC = 2.5 V 0 to 20 VCC = 3.0 V to 4.3 V dt/dv 0 to 10 ns/V Audio amplifier standby mode settings /STDBY Low OFF Device is in shut-down mode High Table 5. Functional description ON Device is in operating mode Analog switch settings truth table SLn Switch N°2 High ON D1 is connected to T1 ON D2 is connected to T2 Low 4/49 Switch N°1 OFF High impedance from D1 to T1 OFF High impedance from D2 to T2 TS4961T TS4961T Absolute maximum ratings and operating conditions Table 6. Pin description Name Pin number Function VCCA 6 Class D audio amplifier power supply voltage input pin VCCS 2 Analog switch power supply voltage input pin /STDBY 12 Standby input pin (active low) to disable the audio amplifier T1 1 Independent output audio channel 1 D2 3 Common input audio channel 2 SL2 4 Select input pin for D2 to T2 (active high) OUT+ 5 Positive differential audio output GNDA 7 Audio amplifier input ground OUT- 8 Negative differential audio output T2 9 Independent output audio channel 2 GNDS 10 Analog switch input ground SL1 11 Select input pin for D1 to T1 (active high) D1 13 Common input audio channel 1 NC 14 No internal connection IN- 15 Audio negative differential input IN+ 16 Audio positive differential input E-Pad - Exposed pad (should be connected to GND) 5/49 Electrical characteristics TS4961T TS4961T 2 Electrical characteristics 2.1 Audio amplifier section Table 7. Electrical characteristics at VCC = +4.3 V with GND = 0 V, Vicm = 2.1 V and Tamb = 25° C (unless otherwise specified)(1) Symbol Typ. Max. Unit Supply current No input signal, no load 2.1 3 mA Standby current (2) No input signal, VSTBY = GND 10 1000 nA Voo Output offset voltage No input signal, RL = 8 3 25 mV Pout Output power, G=6dB THD = 1% Max, f = 1kHz, RL = 4 THD = 10% Max, f = 1kHz, RL = 4 THD = 1% Max, f = 1kHz, RL = 8 THD = 10% Max, f = 1kHz, RL = 8 ICC ISTBY Parameter Min. 1.5 1.95 0.9 1.1 Total harmonic distortion + noise Pout = 600 mWRMS, G = 6dB, 20Hz < f < 20kHz THD + N RL = 8 + 15µH, BW < 30kHz Pout = 700mWRMS, G = 6dB, f = 1kHz RL = 8 + 15µH, BW < 30kHz 2 78 88 Power supply rejection ratio with inputs grounded (3) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , CMRR Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain Gain value (Rin in k) % 0.35 Efficiency Efficiency Pout = 1.45 WRMS, RL = 4 + 15µH Pout = 0.9 WRMS, RL = 8+ 15µH PSRR W % dB 63 57 dB 273k -R in 300k -R in 327k -R in V/V 273 300 327 k RSTBY FPWM Pulse width modulator base frequency 280 kHz SNR Signal to noise ratio (A-weighting) Pout = 0.8W, RL = 8 85 dB tWU Wake-up time 5 10 ms tSTBY 6/49 Internal resistance from standby to GND Standby time 5 10 ms TS4961T TS4961T Electrical characteristics Table 7. Symbol Electrical characteristics at VCC = +4.3 V with GND = 0 V, Vicm = 2.1 V and Tamb = 25° C (unless otherwise specified)(1) (continued) Parameter Min. Typ. Max. Unit Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15µH A-weighted RL = 4 + 15µH 83 60 Unweighted RL = 4 + 30µH A-weighted RL = 4 + 30µH 88 64 Unweighted RL = 8 + 30µH A-weighted RL = 8 + 30µH 78 57 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter VN 85 60 87 65 82 59 VRMS 1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple). Vripple is the superimposed sinusoidal signal to VCC at f = 217 Hz. 7/49 Electrical characteristics Table 8. TS4961T TS4961T Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V, Tamb = 25° C (unless otherwise specified)(1) Symbol Typ. Max. Unit Supply current No input signal, no load 2 2.8 mA Standby current (2) No input signal, VSTBY = GND 10 1000 nA Voo Output offset voltage No input signal, RL = 8 3 25 mV Pout Output power, G=6dB THD = 1% Max, f = 1kHz, RL = 4 THD = 10% Max, f = 1kHz, RL = 4 THD = 1% Max, f = 1kHz, RL = 8 THD = 10% Max, f = 1kHz, RL = 8 ICC ISTBY Parameter Min. 1.1 1.4 0.7 0.85 W Total harmonic distortion + noise Pout = 450 mWRMS, G = 6dB, 20Hz < f < 20kHz THD + N RL = 8 + 15µH, BW < 30kHz Pout = 500mWRMS, G = 6dB, f = 1kHz RL = 8 + 15µH, BW < 30kHz 0.1 Efficiency Pout = 1 WRMS, RL = 4 + 15µH Pout = 0.65 WRMS, RL = 8+ 15µH 78 88 % Efficiency 2 % PSRR Power supply rejection ratio with inputs grounded (3) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , 62 dB CMRR Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp 56 dB Gain Gain value (Rin in k) 273k -R in 300k -R in 327k -R in V/V 273 300 327 k RSTBY FPWM Pulse width modulator base frequency 280 kHz SNR Signal to noise ratio (A-weighting) Pout = 0.6W, RL = 8 83 dB tWU Wake-up time 5 10 ms tSTBY 8/49 Internal resistance from standby to GND Standby time 5 10 ms TS4961T TS4961T Electrical characteristics Table 8. Symbol Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V, Tamb = 25° C (unless otherwise specified)(1) (continued) Parameter Min. Typ. Max. Unit Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 83 61 Unweighted RL = 4 + 15µH A-weighted RL = 4 + 15µH 81 58 Unweighted RL = 4 + 30µH A-weighted RL = 4 + 30µH 87 62 Unweighted RL = 8 + 30µH A-weighted RL = 8 + 30µH 77 56 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter VN 83 57 85 63 80 57 VRMS 1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V. 2. Standby mode is activated when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple). Vripple is the superimposed sinusoidal signal to VCC at f = 217 Hz. 9/49 Electrical characteristics Table 9. TS4961T TS4961T Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V, Tamb = 25° C (unless otherwise specified)(1) Symbol Typ. Max. Unit Supply current No input signal, no load 1.9 2.7 mA Standby current (2) No input signal, VSTBY = GND 10 1000 nA Voo Output offset voltage No input signal, RL = 8 3 25 mV Pout Output power, G=6dB THD = 1% Max, f = 1kHz, RL = 4 THD = 10% Max, f = 1kHz, RL = 4 THD = 1% Max, f = 1kHz, RL = 8 THD = 10% Max, f = 1kHz, RL = 8 ICC ISTBY Parameter Min. 0.7 1 0.5 0.6 Total harmonic distortion + noise Pout = 300 mWRMS, G = 6dB, 20Hz < f < 20kHz THD + N RL = 8 + 15µH, BW < 30kHz Pout = 350mWRMS, G = 6dB, f = 1kHz RL = 8 + 15µH, BW < 30kHz 0.1 Efficiency Efficiency Pout = 0.7 WRMS, RL = 4 + 15µH Pout = 0.45 WRMS, RL = 8+ 15µH W 78 88 PSRR Power supply rejection ratio with inputs grounded (3) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , CMRR 2 Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain Gain value (Rin in k) % % dB 60 54 dB 273k -R in 300k -R in 327k -R in V/V 273 300 327 k RSTBY FPWM Pulse width modulator base frequency 280 kHz SNR Signal to noise ratio (A-weighting) Pout = 0.4W, RL = 8 82 dB tWU Wake-up time 5 10 ms tSTBY 10/49 Internal resistance from standby to GND Standby time 5 10 ms TS4961T TS4961T Electrical characteristics Table 9. Symbol Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V, Tamb = 25° C (unless otherwise specified)(1) (continued) Parameter Min. Typ. Max. Unit Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 83 61 Unweighted RL = 4 + 15µH A-weighted RL = 4 + 15µH 81 58 Unweighted RL = 4 + 30µH A-weighted RL = 4 + 30µH 87 62 Unweighted RL = 8 + 30µH A-weighted RL = 8 + 30µH 77 56 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter VN 83 57 85 63 80 57 VRMS 1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V. 2. Standby mode is active when VSTBY is tied to GND. 3. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple). Vripple is the superimposed sinusoidal signal to VCC at f = 217 Hz. 11/49 Electrical characteristics Table 10. TS4961T TS4961T Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25 V, Tamb = 25° C (unless otherwise specified) Symbol Typ. Max. Unit Supply current No input signal, no load 1.7 2.4 mA Standby current (1) No input signal, VSTBY = GND 10 1000 nA Voo Output offset voltage No input signal, RL = 8 3 25 mV Pout Output power, G=6dB THD = 1% Max, f = 1kHz, RL = 4 THD = 10% Max, f = 1kHz, RL = 4 THD = 1% Max, f = 1kHz, RL = 8 THD = 10% Max, f = 1kHz, RL = 8 ICC ISTBY Parameter Min. 0.5 0.65 0.33 0.41 W Total harmonic distortion + noise Pout = 180 mWRMS, G = 6dB, 20Hz < f < 20kHz THD + N RL = 8 + 15µH, BW < 30kHz Pout = 200mWRMS, G = 6dB, f = 1kHz RL = 8 + 15µH, BW < 30kHz 0.05 Efficiency Pout = 0.47 WRMS, RL = 4 + 15µH Pout = 0.3 WRMS, RL = 8+ 15µH 78 88 % Efficiency 1 % PSRR Power supply rejection ratio with inputs grounded (2) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , 60 dB CMRR Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp 54 dB Gain Gain value (Rin in k) 273k -R in 300k -R in 327k -R in V/V 273 300 327 k RSTBY FPWM Pulse width modulator base frequency 280 kHz SNR Signal to noise ratio (A-weighting) Pout = 0.3W, RL = 8 80 dB tWU Wake-up time 5 10 ms tSTBY 12/49 Internal resistance from standby to GND Standby time 5 10 ms TS4961T TS4961T Electrical characteristics Table 10. Symbol Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25 V, Tamb = 25° C (unless otherwise specified) (continued) Parameter Min. Typ. Max. Unit Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15µH A-weighted RL = 4 + 15µH 76 56 Unweighted RL = 4 + 30µH A-weighted RL = 4 + 30µH 82 60 Unweighted RL = 8 + 30µH A-weighted RL = 8 + 30µH 67 53 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter VN 85 60 78 57 74 54 VRMS 1. Standby mode is active when VSTBY is tied to GND. 2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple). Vripple is the superimposed sinusoidal signal to VCC at f = 217 Hz. 13/49 Electrical characteristics Table 11. TS4961T TS4961T Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V, Tamb = 25° C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Supply current No input signal, no load 1.7 mA Standby current (1) No input signal, VSTBY = GND 10 nA Voo Output offset voltage No input signal, RL = 8 3 mV Pout Output power, G=6dB THD = 1% Max, f = 1kHz, RL = 4 THD = 10% Max, f = 1kHz, RL = 4 THD = 1% Max, f = 1kHz, RL = 8 THD = 10% Max, f = 1kHz, RL = 8 ICC ISTBY THD + N Total harmonic distortion + noise Pout = 150 mWRMS, G = 6dB, 20Hz < f < 20kHz RL = 8 + 15µH, BW < 30kHz Efficiency 0.42 0.61 0.3 0.38 Efficiency Pout = 0.38 WRMS, RL = 4 + 15µH Pout = 0.25 WRMS, RL = 8+ 15µH CMRR Gain 1 % 77 86 % 54 Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain value (Rin in k) W dB 273k -R in 300k -R in 327k -R in V/V 273 300 327 k RSTBY FPWM Pulse width modulator base frequency 280 kHz SNR Signal to noise ratio (A-weighting) Pout = 0.25W, RL = 8 80 dB tWU Wake-up time 5 ms tSTBY 14/49 Internal resistance from standby to GND Standby time 5 ms TS4961T TS4961T Electrical characteristics Table 11. Symbol Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V, Tamb = 25° C (unless otherwise specified) (continued) Parameter Min. Typ. Max. Unit Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 86 62 Unweighted RL = 4 + 15µH A-weighted RL = 4 + 15µH 76 56 Unweighted RL = 4 + 30µH A-weighted RL = 4 + 30µH 82 60 Unweighted RL = 8 + 30µH A-weighted RL = 8 + 30µH 67 53 Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter VN 85 60 78 57 74 54 VRMS 1. Standby mode is active when VSTBY is tied to GND. 15/49 Electrical characteristics TS4961T TS4961T 2.2 Analog switch section Table 12. DC specifications Value Symbol Parameter VCC (V) Test conditions Tamb = 25 °C Min Typ Max -40 to 85 °C Min 2.5 High level input voltage 2.7 -3.0 1.3 1.3 3.3 -3.6 1.4 1.4 1.5 Max 1.2 4.3 VIH 1.2 1.5 V 2.5 0.25 2.7 -3.0 0.25 0.25 3.3 -3.6 0.30 0.30 0.40 0.40 1.10 1.3 1.5 1.15 1.4 1.6 1.25 1.5 1.8 2.7 1.35 1.6 1.9 4.3 Low level input voltage 0.25 4.3 VIL 10 V 4.3 RPEAK, Switch Tn ON resistance Tn RON, Tn ON resistance match between Tn channels(1) Unit 3.6 3.0 3.6 3.0 VS = 0 V to VCC IS = 100 mA VS at RPEAK IS = 100 mA 14 m 14 2.7 4.3 RFLAT, Tn ON resistance flatness for Tn channels(2) 15 0.45 0.50 0.55 0.45 0.50 0.55 0.50 0.55 0.60 0.55 0.60 0.70 VS = 0.3 or 4 V ±0.1 ±1 µA VSEL = 0 to 4.3 V ±0.05 ±1 µA VSEL = VCC or GND ±0.05 ±0.2 µA 3.6 3.0 VS = 0 to VCC IS = 100 mA 2.7 IOFF OFF state leakage current (Tn), (Dn) ISEL SEL leakage current ICC Quiescent supply current ICCLV Quiescent supply current low voltage driving 4.3 0 -4.3 2.4 -4.3 VSEL = 1.65 V 4.3 ±37 ±50 ±100 VSEL = 1.80 V ±33 ±40 ±50 VSEL = 2.60 V ±12 ±20 ±30 1. RON = RON(max) - RON(min). 2. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges. 16/49 µA TS4961T TS4961T Table 13. Electrical characteristics AC electrical characteristics (CL = 35 pF, RL = 50 , tr = tf 5 ns) Value Symbol Parameter VCC (V) Test conditions Tamb = 25 °C Min Typ Max -40 to 85 °C Min Max 2.5 - -2.7 Turn-OFF time 0.30 65 85 90 42 55 65 40 55 65 2.5 - -2.7 tOFF 0.30 3.6 - -4.3 Turn-ON time 3.0 - -3.3 2.5 - -2.7 tON 0.45 3.6 - -4.3 tPLH, tPHL Propagation delay 18 30 40 16 30 40 15 30 40 3.0 - -3.3 3.0 - -3.3 VS = 1.5 V VS = 1.5 V 3.6 - -4.3 2.5 - -2.7 Q Charge injection Unit 3.0 - -3.3 3.6 - -4.3 CL = 100 pF RL = 1 M VGEN = 0 V RGEN = 0 ns ns ns 51 51 pC 49 17/49 Electrical characteristics Table 14. TS4961T TS4961T Analog switch characteristics (CL = 5 pF, RL = 50 , Tamb = 25 °C) Value Symbol Parameter VCC (V) Test conditions Tamb = 25 °C Min OIRRTn Off isolation for switch T1,T2 Crosstalk between XtalkTn T1 and T2 BWTn -3 dB bandwidth for switch T1, T2 CSEL Typ Max -40 to 85 °C Min Unit Max 2.5 - 4.3 - Control pin input capacitance 2.5 - -4.3 -80 VS=1 Vrms, F = 10 MHz, RL = 50 -60 VS=1 Vrms, F = 1 MHz -85 VS=1 Vrms, F = 10 MHz -74 RL = 50 Signal = 0 dBm 58 MHz VCC = 0 V 2.5 - -4.3 VS=1 Vrms, F=1 MHz, RL = 50 9 pF dB dB CON,Tn Tn port capacitance when the switch is enabled 3.3 F = 1 MHz 113 pF COFF,Tn Tn port capacitance when the switch is disabled 3.3 F = 1 MHz 85 pF 18/49 TS4961T TS4961T Electrical characteristics curves 3 Electrical characteristics curves 3.1 Audio amplifier section The graphs included in this section use the following abbreviations: RL + 15 µH or 30 µH = pure resistor + very low series resistance inductor. Filter = LC output filter (1 µF+30 µH for 4 and 0.5 µF+6 0µH for 8 ). All measurements done with Cs1 = 1 µF and Cs2 = 100 nF except for PSRR where Cs1 is removed. Figure 1. Test diagram for audio amplifier measurements Vcc 1uF GND Cin Rin 150k VCCA CSA Out+ In+ 15uH or 30uH Audio Amplifier of the TS4961T TS4961T Rin or 5th order RL 150k 50kHz low pass filter LC Filter In- Out- GNDA Cin 4 or 8 Ohms GND Audio Measurement Bandwidth < 30kHz Test diagram for audio amplifier PSRR measurements 20Hz to 20kHz 100nF Vcc CSA Rin 4.7uF GND VCCA GND Cin 150k Cin 4.7uF In+ Out+ Audio Amplifier of the TS4961T TS4961T 150k 15uH or 30uH or Rin LC Filter In- GNDA Figure 2. 4 or 8 Ohms 5th order RL 50kHz low pass filter Out- GND GND 5th order 50kHz low pass Reference RMS Selective Measurement Bandwidth=1% of Fmeas filter 19/49 Electrical characteristics curves Figure 3. TS4961T TS4961T Current consumption vs. power supply voltage Figure 4. Current consumption vs. standby voltage No load Tamb=25°C Vcc = 3V No load Tamb=25°C Output offset voltage vs. common mode input voltage Figure 6. G = 6dB Tamb = 25°C Efficiency vs. output power Efficiency Power Dissipation Figure 7. Efficiency vs. output power Figure 8. Output power vs. power supply voltage 3.5 Power Dissipation Output power (W) Efficiency Power Dissipation (mW) 3.0 2.5 RL = 4 + 15H F = 1kHz BW < 30kHz Tamb = 25°C 2.0 THD+N=10% 1.5 1.0 THD+N=1% 0.5 0.0 20/49 2.5 3.0 3.5 Vcc (V) 4.0 Power Dissipation (mW) Figure 5. TS4961T TS4961T Electrical characteristics curves Figure 9. Output power (W) 2.0 Output power vs. power supply voltage 0 RL = 8 + 15H F = 1kHz BW < 30kHz Tamb = 25°C 1.5 Figure 10. PSSR vs. frequency -10 -20 -30 THD+N=10% ° -40 1.0 -50 0.5 -60 THD+N=1% -70 0.0 2.5 3.0 3.5 Vcc (V) 4.0 Figure 11. PSSR vs. frequency -80 20 100 1000 10000 20k Figure 12. PSSR vs. frequency 0 0 -10 -10 -20 -30 -20 -30 ° -40 -50 -60 -60 -70 ° -40 -50 -70 -80 20 100 1000 10000 20k Figure 13. PSSR vs. frequency -80 20 100 1000 10000 20k Figure 14. PSSR vs. frequency 0 0 -10 -10 -20 -30 -20 -30 ° -40 -60 -70 ° -50 -60 -40 -50 -70 -80 20 100 1000 10000 20k -80 20 100 1000 10000 20k 21/49 Electrical characteristics curves TS4961T TS4961T Figure 15. PSSR vs. frequency Figure 16. PSSR vs. common mode input voltage 0 Vripple = 200mVpp F = 217Hz, G = 6dB RL 4 + 15H Tamb = 25°C -10 -20 -30 ° -40 -50 -60 -70 -80 20 100 1000 10000 20k Figure 17. CMRR vs. common mode input voltage Figure 18. CMRR vs. frequency Vicm = 200mVpp F = 217Hz G = 6dB RL 4 + 15H Tamb = 25°C RL=4 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25°C Vcc=3.6V, 2.5V 20 Figure 19. CMRR vs. frequency RL=4 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25°C 20 22/49 20k Figure 20. CMRR vs. frequency RL=4 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25°C Vcc=3.6V, 2.5V 20k 20 Vcc=3.6V, 2.5V 20k TS4961T TS4961T Electrical characteristics curves Figure 21. CMRR vs. frequency RL=8 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25°C Figure 22. CMRR vs. frequency RL=8 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25°C Vcc=3.6V, 2.5V 20 20k Figure 23. CMRR vs. frequency RL=8 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25°C 20 20k Figure 24. THD+N vs. output power RL = 4 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C Vcc=3.6V, 2.5V 20 Vcc=3.6V, 2.5V Vcc=3.6V Vcc=2.5V 20k Figure 25. THD+N vs. output power RL = 4 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C 3 Figure 26. THD+N vs. output power RL = 8 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C Vcc=3.6V Vcc=2.5V 3 Vcc=3.6V Vcc=2.5V 2 23/49 Electrical characteristics curves TS4961T TS4961T Figure 27. THD+N vs. output power RL = 8 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C Figure 28. THD+N vs. output power RL = 4 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C Vcc=3.6V Vcc=2.5V Vcc=3.6V Vcc=2.5V 2 Figure 29. THD+N vs. output power RL = 4 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C 3 Figure 30. THD+N vs. output power RL = 8 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C Vcc=3.6V Vcc=2.5V Vcc=3.6V Vcc=2.5V 2 3 Figure 31. THD+N vs. output power RL = 8 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C Figure 32. THD+N vs. frequency RL=4 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C Vcc=3.6V Vcc=2.5V Po=0.35W Po=0.17W 2 24/49 50 20k TS4961T TS4961T Electrical characteristics curves Figure 33. THD+N vs. frequency RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C Figure 34. THD+N vs. frequency RL=4 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C Po=0.35W Po=0.85W Po=0.42W Po=0.17W 50 20k Figure 35. THD+N vs. frequency RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C 50 20k Figure 36. THD+N vs. frequency RL=8 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C Po=0.85W Po=0.18W Po=0.1W Po=0.42W 50 20k Figure 37. THD+N vs. frequency RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C 50 20k Figure 38. THD+N vs. frequency RL=8 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C Po=0.18W Po=0.45W Po=0.1W Po=0.22W 50 20k 50 20k 25/49 Electrical characteristics curves TS4961T TS4961T Figure 39. THD+N vs. frequency RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25°C Figure 40. Gain vs. frequency Po=0.45W Vcc=3.6V & 2.5V RL=4 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25°C Po=0.22W 50 20k Figure 41. Gain vs. frequency 20 20k Figure 42. Gain vs. frequency Vcc= 3.6V & 2.5V Vcc=3.6V & 2.5V RL=4 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25°C RL=4 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25°C 20 20k Figure 43. Gain vs. frequency 20 20k Figure 44. Gain vs. frequency Vcc= 3.6V & 2.5V Vcc= 3.6V & 2.5V RL=8 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25°C 20 26/49 RL=8 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25°C 20k 20 20k TS4961T TS4961T Electrical characteristics curves Figure 45. Gain vs. frequency Figure 46. Gain vs. frequency Vcc= 3.6V & 2.5V Vcc= 3.6V & 2.5V RL=8 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25°C RL=No Load G=6dB Vin=500mVpp Cin=1F Tamb = 25°C 20 20k 20 20k Figure 47. Startup & shutdown time VCC = 3 V, Figure 48. Startup & shutdown time VCC = 3 V, G = 6 dB, Cin = 1 µF (5 ms/div) G = 6 dB, Cin = 100 nF (5 ms/div) Vo1 Vo1 Vo2 Vo2 Standby Standby Vo1-Vo2 Vo1-Vo2 Figure 49. Startup & shutdown time VCC = 3 V, G = 6 dB, no Cin (5 ms/div) Vo1 Vo2 Standby Vo1-Vo2 27/49 Electrical characteristics curves 3.2 TS4961T TS4961T Analog switch section The graphs included in this section use the following abbreviations. RL + 15 µH or 30 µH = pure resistor + very low series resistance inductor. Filter = LC output filter (1 µF + 30 µH for 4 and 0.5 µF + 6 0µH for 8 ). All measurements done with Cs1 = 1 µF and Cs2 = 100 nF except for PSRR where Cs1 is removed. Figure 50. Test diagram for switch measurements Vcc VCCS CSS GND 100nF 4 or 8 Ohms D1 T1 RL Switch section of the TS4961T TS4961T T2 D2 SL1 SL2 Vcc GNDS GND Measurement Audio Measurement Audio Amplifier Bandwidth < 30kHz Figure 51. Test diagram for isolation switch measurements Vcc VCCS CSS GND 100nF D1 T1 RL Switch section of the TS4961T TS4961T T2 D2 SL1 GND SL2 GNDS GND Measurement 28/49 Audio Measurement Audio Amplifier Bandwidth < 30kHz TS4961T TS4961T Electrical characteristics curves Figure 52. ON resistance IDS V VCC T D VS VCC SEL GND Figure 53. OFF leakage VCC IT(Off) A ID(Off) T D A VD VS GND SEL GND 29/49 Electrical characteristics curves TS4961T TS4961T Figure 54. OFF isolation VCC T VOUT D VS 50 GND SEL GND Figure 55. Bandwidth VCC T VOUT D VS VCC 50 SEL GND 30/49 TS4961T TS4961T Electrical characteristics curves Figure 56. Switch-to-switch crosstalk VCC T1 D1 VS VCC 50 SEL1 T2 VOUT D2 50 VCC SEL2 GND Figure 57. Test circuit Note: 1 CL = 5/35 pF or equivalent (includes jig and probe capacitance). 2 RL = 50 or equivalent. 3 RT = ZOUT of pulse generator (typically 50 ). 31/49 Electrical characteristics curves TS4961T TS4961T Figure 58. Switching time and charge injection Figure 59. Switching time and charge injection test circuit schematics RL = 1 M CL = 100 pF , VCC T VOUT D RL CL SEL VIN GND Figure 60. Turn on, turn off time test circuit schematics Figure 61. Turn on, turn off time VCC VS T VOUT D RL CL SEL VIN GND Figure 62. THD+N vs. output power RL = 4 F = 100Hz BW < 30kHz Tamb = 25°C Vcc=4.3V Figure 63. THD+N vs. output power RL = 8 F = 100Hz BW < 30kHz Tamb = 25°C Vcc=3.3V Vcc=2.5V 32/49 Vcc=3.3V Vcc=2.5V Vcc=4.3V TS4961T TS4961T Electrical characteristics curves Figure 64. THD+N vs. output power RL = 4 F = 1kHz BW < 30kHz Tamb = 25°C Figure 65. THD+N vs. output power RL = 8 F = 1kHz BW < 30kHz Tamb = 25°C Vcc=4.3V Vcc=3.3V Vcc=3.3V Vcc=2.5V Vcc=2.5V Figure 66. THD+N vs. output power RL = 4 F = 10kHz BW < 30kHz Tamb = 25°C Figure 67. THD+N vs. output power RL = 8 F = 10kHz BW < 30kHz Tamb = 25°C Vcc=4.3V Vcc=3.3V Vcc=4.3V Vcc=3.3V Vcc=2.5V Vcc=2.5V Figure 68. THD+N vs. frequency Figure 69. THD+N vs. frequency RL=4 Vcc=2.5V Bw < 30kHz Tamb = 25°C RL=8 Vcc=2.5V Bw < 30kHz Tamb = 25°C Po=10mW Po=15mW Po=2mW 50 Vcc=4.3V Po=5mW 20k 50 20k 33/49 Electrical characteristics curves TS4961T TS4961T Figure 70. THD+N vs. frequency Figure 71. THD+N vs. frequency RL=4 Vcc=3.3V Bw < 30kHz Tamb = 25°C Po=120mW Po=230mW Po=35mW Po=50mW Po=20mW Po=10mW 50 20k Figure 72. THD+N vs. frequency 50 RL=4 Vcc=4.3V Bw < 30kHz Tamb = 25°C Po=420mW RL=8 Vcc=4.3V Bw < 30kHz Tamb = 25°C Po=130mW Po=90mW Po=50mW Po=30mW 50 20k Figure 74. Isolation vs. frequency Vcc=2.5V or 3.3V or 4.3V Bw < 30kHz Tamb = 25°C RL=20k RL=100k RL=600 RL=300 RL=4 and 8 34/49 20k Figure 73. THD+N vs. frequency Po=260mW 20 RL=8 Vcc=3.3V Bw < 30kHz Tamb = 25°C 20k 50 20k TS4961T TS4961T 4 Application component information Application component information Table 15. Component information Component Functional description CSA Bypass supply capacitor. Install as close as possible to the VCCA pin of the TS4961T TS4961T to minimize high-frequency ripple. A 1 uF ceramic capacitor should be added to enhance power supply filtering at high frequencies (see below). CSS Bypass supply capacitor. Install as close as possible to the VCCS pin of the TS4961T TS4961T to minimize high-frequency ripple. A 100 nF ceramic capacitor should be added to enhance power supply filtering at high frequencies. RIN Input resistor to program the TS4961T TS4961T differential gain (gain = 300 k/RIN with RIN in k). CIN Because common mode feedback is implemented, these input capacitors are optional. However, they can be added to form with RIN a 1st order high pass filter with a -3 dB cut-off frequency = 1/(2*RIN*CIN). Figure 75. Typical application schematics CSA 2.4 to 4.3V VCCA 6 /STDBY 12 CIN RIN IN+ 16 BB CIN GNDA 7 15 RIN TS4961T TS4961T 5 Class D Amplifier 8 IN- SL1 SL2 D1 OUT+ OUT- 11 4 1 13 T1 4-8 ohms CODEC D2 2.4 to 4.3V 3 9 Analog Switch 2 VCCS T2 7 GNDS CSS 35/49 Application component information 4.1 TS4961T TS4961T Common mode feedback loop limitations 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. However, because of the Vicm limitation in the input stage (see Table 2: Operating conditions for audio amplifier section on page 3), the common mode feedback loop can only fulfill its role within a defined range. This range depends upon the values of VCC and Rin (Av). To obtain a good estimation of the Vicm value, the following formula can be used (no tolerance on Rin): V CC × R in + 2 × V IC × 150k V icm = -2 × ( R in + 150k) (V) with + - In + In V IC = -2 (V) and the result of the calculation must be in the range: 0.5V V icm V CC 0.8V Due to the +/-9% tolerance on the 150 k resistor, it is also important to check Vicm in these conditions: V CC × R in + 2 × V IC × 136.5k V CC × R in + 2 × V IC × 163.5k - V icm -2 × ( R in + 136.5k) 2 × ( R in + 163.5k) If the result of the Vicm calculation is not in the previous range, input coupling capacitors must be used (with VCC from 2.4 V to 2.5 V, input coupling capacitors are mandatory). For example: With VCC = 3 V, Rin = 150 k and VIC = 2.5 V, we typically find Vicm = 2 V and this is lower than 3 V - 0.8 V = 2.2 V. With 136.5 k we find 1.97 V, and with 163.5 k we have 2.02 V. Therefore, no input coupling capacitors are required. 36/49 TS4961T TS4961T 4.2 Application component information Low frequency response If a low frequency bandwidth limitation is required, it is possible to use input coupling capacitors. In the low frequency region, Cin (input coupling capacitor) starts to have an effect. Cin forms, with Rin, a first order high-pass filter with a -3 dB cut-off frequency: 1 F CL = -2 × R in × C in (Hz) Therefore, for a desired cut-off frequency FCL, Cin is calculated as follows: 1 C in = -2 × R in × F CL (F) with Rin in and FCL in Hz. 4.3 Decoupling of the circuit A power supply capacitor, referred to as CS, is necessary to correctly bypass the class D part of the TS4961T TS4961T. The TS4961T TS4961T has a typical switching frequency at 250 kHz and an output fall and rise time at approximately 5 ns. Because of these very fast transients, careful decoupling is mandatory. A 1 µF ceramic capacitor is enough, but it must be located very close to the TS4961T TS4961T in order to avoid any extra parasitic inductance created by a long track wire. In relation with dI/dt, this parasitic inductance introduces an overvoltage that decreases the global efficiency and, if it is too high, may cause a breakdown of the device. In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its current capability is also important. A 0603 size is a good compromise, particularly when a 4 load is used. Another important parameter is the rated voltage of the capacitor. A 1 µF/6.3 V capacitor used at 5 V, loses about 50% of its value. In fact, with a 5 V power supply voltage, the decoupling value is about 0.5 µF instead of 1 µF. Since CS has a particular influence on the THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply AMR value (6 V). 4.4 Wake-up time (tWU) There is a wait of approximately 5 ms when standby is released to set the device ON. The TS4961T TS4961T has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise. 37/49 Application component information 4.5 TS4961T TS4961T Shutdown time (tSTBY) When the standby command is set, the time required to put the two output stages into high impedance and to put the internal circuitry in standby mode, is about 5 ms. This time is used to decrease the gain and avoid any pop noise during shutdown. 4.6 Consumption in standby mode Between the shutdown pin and GND there is an internal 300 k resistor. This resistor forces the TS4961T TS4961T to switch to standby mode when the standby input is left floating. However, this resistor also introduces additional power consumption if the standby pin voltage is not 0 V. 4.7 Single-ended input configuration The TS4961Tcan be used in a single-ended input configuration, but input coupling capacitors are necessary. Figure 76 shows a typical single-ended input application. Figure 76. Typical single-ended input application Vcc Standby 6 VCCA Ve 12 Stdby 300k Cin GND Rin InIn+ GND 16 Cin 5 Output - H PWM + Rin GND Out+ 150k 15 Csa 1uF Internal Bias Bridge SPEAKER 150k 8 Out- Oscillator GNDA TS4961T TS4961T(Audio Amplifier Part) 7 GND All formulas are identical except for the gain (with Rin in k) : AV sin gle Ve 300 = - = -+ R in Out Out Due to the internal resistor tolerance, AVsingle is in the range of: 273 327 - A V -sin gle R in R in In the event that multiple single-ended inputs are summed, it is important that the impedance on both TS4961 TS4961 inputs (In- and In+) be equal. 38/49 TS4961T TS4961T Application component information Figure 77. Typical application schematics with multiple single-ended inputs Standby Vcc Vek Cink 6 VCCA Rink 12 Stdby GND 300k Ve1 Cin1 Rin1 InIn+ 16 GND 5 Output PWM + Req Ceq GND Out+ 150k 15 Csa 1uF Internal Bias H Bridge SPEAKER 150k 8 Out- Oscillator GND TS4961T TS4961T (Audio Amplifier Part) GNDA 7 GND We have the following equations. + 300 300 Out Out = V e1 × - + .+ V ek × -R in1 R ink (V) k C eq = C inj Cinj j=1 1 = -2× × R × F inj CLj (F) 1 R eq = -k 1 -Rinj j =1 In general, for mixed situations (single-ended and differential inputs), the same rule must be used, that is, to equalize impedance on both TS4961T TS4961T inputs. 39/49 Application component information 4.8 TS4961T TS4961T Output filter considerations The TS4961T TS4961T is designed to operate without an output filter. However, due to very sharp transients on the TS4961T TS4961T output, EMI radiated emissions may cause some standard compliance issues. These EMI standard compliance issues can appear if the distance between the TS4961T TS4961T outputs and loudspeaker terminal are long (typically more than 50 mm, or 100 mm in both directions, to the speaker terminals). Since 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, there are several simple rules to follow. Reduce, as much as possible, the distance between the TS4961T TS4961T output pins and the speaker terminals. Use ground planes for shielding sensitive wires. Place, as close as possible to the TS4961T TS4961T and in series with each output, a ferrite bead with a rated current of 2.5 A minimum, and impedance greater than 50 at frequencies above 30 MHz. If, after testing, these ferrite beads are not necessary, replace them by a short circuit. Allow enough footprint to place, if necessary, a capacitor to short perturbations to ground as shown in Figure 78. Figure 78. Output filter for shorting pertubations to ground Ferrite chip bead To speaker From TS4961T TS4961T output about 100pF Gnd In the case where the distance between the TS4961T TS4961T outputs and speaker terminals is high, it is possible to have low frequency EMI issues due to the fact that the typical operating frequency is 250 kHz. In this configuration, it is recommended to use an output filter. It should be placed as close as possible to the TS4961T TS4961T. 40/49 TS4961T TS4961T Application component information 4.9 Examples with summed inputs 4.9.1 Example 1: dual differential inputs Figure 79. Typical application schematics with dual differential inputs Vcc 6 VCCA Standby 12 Stdby E2+ R2 300k R1 E1- R1 15 InIn+ 16 5 Output - H PWM + Bridge SPEAKER 150k E2- GND Out+ 150k E1+ Csa 1uF Internal Bias 8 Out- R2 Oscillator GNDA 7 TS4961T TS4961T (Audio Amplifier Part) GND With (Ri in k): + - 300 A V = Out Out- = -1 + R1 E1 E1 + - Out OutA V = - = 300 -2 + R2 E2 E2 V CC × R 1 × R 2 + 300 × ( V IC1 × R 2 + V IC2 × R 1 ) 0.5V - V CC 0.8V 300 × ( R 1 + R 2 ) + 2 × R 1 × R 2 + - + - E1 + E1 E2 + E2 V IC = - and V IC = -1 2 2 2 41/49 Application component information 4.9.2 TS4961T TS4961T Example 2: one differential input plus one single-ended input Figure 80. Typical application schematics with one differential input plus one single-ended input Vcc Standby 6 VCCA 12 Stdby E2+ R2 300k E1 R1 E2- R2 15 16 5 Output InIn+ + H PWM Bridge SPEAKER 150k 8 R1 GND C1 OutOscillator GNDA 7 TS4961T TS4961T (Audio Amplifier Part) GND With (Ri in k): + - + - 300 A V = Out Out- = -1 + R1 E1 300 A V = Out Out- = -2 + R2 E2 E2 1 C 1 = -2 × R 1 × F CL 42/49 GND Out+ 150k C1 Csa 1uF Internal Bias (F) TS4961T TS4961T 4.10 Application component information Using the audio amplifier and switch on the same speaker The TS4961T TS4961T can be used to supply a speaker with two different sources. The typical application is shown in Figure 81. Figure 81. Typical application schematics for the TS4961T TS4961T CSA 2.4 to 4.3V VCCA 6 /STDBY 12 CIN Line Out Source RIN IN+ 16 CIN 15 RIN SL2 2.4 to 4.3V TS4961T TS4961T 5 Class D Amplifier 8 IN- SL1 Speaker Out Source GNDA 7 D1 D2 OUT+ OUT- 11 4 1 13 3 9 Analog Switch 2 VCCS T1 4-8 ohms T2 7 GNDS CSS The first source is a line-out signal provided by the baseband and the second is a speaker-out signal coming from the CODEC. Switching is done through the standby pin (/STDBY) of the audio amplifier and through the SLn pins of the switch. Note that, as shown in Figure 82, all pins should not be switched at the same time because this can cause damage to the TS4961T TS4961T audio amplifier and to the external audio amplifier that provides the speaker-out signal. 43/49 Application component information TS4961T TS4961T Figure 82. Timing of switching between two audio sources High /STDBY Low t High SL1 & SL2 Low t Delay >10ms Status 44/49 Speaker Not Connected Speaker Connected to the Line Out Source Delay >1ms Speaker Connected to the Speaker Out Source Speaker Connected to the Line Out Source TS4961T TS4961T 5 Package information Package information In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97 JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 45/49 Package information TS4961T TS4961T Figure 83. QFN16 QFN16 3 x 3 mm package mechanical drawing Note: 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 pins 7 and 10 or left floating. Table 16. QFN16 QFN16 3 x 3 mm package mechanical data Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. 0.80 0.90 1.00 0.031 0.035 0.039 A1 0.02 0.05 0.001 0.002 A3 0.20 A 0.008 b 0.18 0.25 0.30 0.007 0.01 0.012 D 2.85 3.00 3.15 0.112 0.118 0.124 D1 1.50 0.059 D2 1.70 1.80 1.90 0.067 0.071 0.075 E 2.85 3.00 3.15 0.112 0.118 0.124 E1 1.50 0.059 E2 1.70 1.80 1.90 0.067 0.071 0.075 e 0.45 0.50 0.55 0.018 0.020 0.022 L 0.30 0.40 0.50 0.012 0.016 0.020 ddd 46/49 0.08 0.003 TS4961T TS4961T Package information Figure 84. QFN16 QFN16 3 x 3 mm package recommended footprint Note: The substrate pad should be tied to the PCB GND. 47/49 Ordering information 6 TS4961T TS4961T Ordering information Table 17. Order codes Order code 7 Package Packing Marking -40°C to +85°C TS4961TIQT TS4961TIQT Temperature range QFN16 QFN16 Tape & reel K61T Revision history Table 18. Document revision history Date 16-Sep-2008 48/49 Revision 1 Changes Initial release. TS4961T TS4961T 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. 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