TS4961T
Mono class D audio power amplifier with dedicated analog switch
Features
QFN 16 3 x 3 mm
Wide operating voltage range from VCC = 2.4 V to 4.3 V 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 Ultra-high off-isolation on analog switch: -80 dB typical from 20 Hz to 20 kHz TS4961TIQT pinout
Applications
Cellular telephones PDA s Notebook PCs 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.
Description
The 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
Contents
1 2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 2.2 Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1 3.2 Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4
Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 36 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Wake-up time (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Consumption in standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.9.1 4.9.2 Example 1: dual differential inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Example 2: one differential input plus one single-ended input . . . . . . . . 42
4.10
Using the audio amplifier and switch on the same speaker . . . . . . . . . . . 43
5 6 7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
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TS4961T
Absolute maximum ratings and operating conditions
1
Table 1.
Symbol
Absolute maximum ratings and operating conditions
Absolute maximum ratings
Parameter Value GND to 5.5 GND-0.3V / VCC+0.3V -40 to + 85 -65 to +150 150
(3)
Unit V V C C C C/W C/W
VCCA & VCCS Supply voltage (1) (2) Vin Toper Tstg Tj Rthja Rthjc Pd ESD Machine model Latch-up VSTBY Input voltage Operating free-air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient Thermal resistance junction to case Power dissipation Human body model (5)
(6)
39 5 Internally limited (4) 2 200 200 100 200 GND-0.3V / VCC+0.3V 260
kV V mA V C
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) Standby pin voltage maximum voltage Lead temperature (soldering, 10 sec)
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.
Symbol VCCA VIC VSTBY RL
Operating conditions for audio amplifier section
Parameter Supply voltage(1) Common mode input voltage range Standby voltage input: (3) Class D amplifier ON Class D amplifier OFF(4) Load resistor
(2)
Value 2.4 to 4.3 0.5 to VCC-0.8 1.4 VSTBY VCC GND VSTBY 0.4 4
Unit V V V
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.
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Absolute maximum ratings and operating conditions Table 3.
Symbol VCC Vin VIC VO dt/dv Supply voltage Input voltage Control input voltage Output voltage Input rise and fall time control input VCC = 2.5 V VCC = 3.0 V to 4.3 V
TS4961T
Operating conditions for analog switch section
Parameter Value 2.4 to 4.3 0 to VCC 0 to 4.3 0 to VCC 0 to 20 ns/V 0 to 10 Unit V V V V
Table 4.
Audio amplifier standby mode settings
/STDBY Low High Functional description OFF Device is in shut-down mode ON Device is in operating mode
Table 5.
Analog switch settings truth table
SLn High Low Switch N1 ON D1 is connected to T1 OFF High impedance from D1 to T1 Switch N2 ON D2 is connected to T2 OFF High impedance from D2 to T2
4/49
TS4961T Table 6.
Name VCCA VCCS /STDBY T1 D2 SL2 OUT+ GNDA OUTT2 GNDS SL1 D1 NC ININ+ E-Pad
Absolute maximum ratings and operating conditions Pin description
Pin number 6 2 12 1 3 4 5 7 8 9 10 11 13 14 15 16 Function Class D audio amplifier power supply voltage input pin Analog switch power supply voltage input pin Standby input pin (active low) to disable the audio amplifier Independent output audio channel 1 Common input audio channel 2 Select input pin for D2 to T2 (active high) Positive differential audio output Audio amplifier input ground Negative differential audio output Independent output audio channel 2 Analog switch input ground Select input pin for D1 to T1 (active high) Common input audio channel 1 No internal connection Audio negative differential input Audio positive differential input Exposed pad (should be connected to GND)
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Electrical characteristics
TS4961T
2
2.1
Electrical characteristics
Audio amplifier section
Table 7.
Symbol ICC ISTBY Voo
Electrical characteristics at VCC = +4.3 V with GND = 0 V, Vicm = 2.1 V and Tamb = 25 C (unless otherwise specified)(1)
Parameter Supply current No input signal, no load Standby current (2) No input signal, VSTBY = GND Output offset voltage No input signal, RL = 8 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 Min. Typ. 2.1 10 3 Max. 3 1000 25 Unit mA nA mV
Pout
1.5 1.95 0.9 1.1
W
Total harmonic distortion + noise Pout = 600 mWRMS, G = 6dB, 20Hz < f < 20kHz THD + N RL = 8 + 15H, BW < 30kHz Pout = 700mWRMS, G = 6dB, f = 1kHz RL = 8 + 15H, BW < 30kHz Efficiency Efficiency Pout = 1.45 WRMS, RL = 4 + 15H Pout = 0.9 WRMS, RL = 8+ 15H PSRR CMRR Gain RSTBY FPWM SNR tWU tSTBY Power supply rejection ratio with inputs grounded (3) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain value (Rin in k) Internal resistance from standby to GND Pulse width modulator base frequency Signal to noise ratio (A-weighting) Pout = 0.8W, RL = 8 Wake-up time Standby time
273 k ----------------R in
2 0.35 78 88 63 57
300 k ----------------R in 327 k ----------------R in
%
%
dB dB V/V k kHz dB 10 10 ms ms
273
300 280 85 5 5
327
6/49
TS4961T Table 7.
Symbol
Electrical characteristics 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 Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H VN Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 85 60 86 62 83 60 88 64 78 57 87 65 82 59 VRMS Min. Typ. Max. Unit
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.
Symbol ICC ISTBY Voo
TS4961T
Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V, Tamb = 25 C (unless otherwise specified)(1)
Parameter Supply current No input signal, no load Standby current (2) No input signal, VSTBY = GND Output offset voltage No input signal, RL = 8 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 Min. Typ. 2 10 3 Max. 2.8 1000 25 Unit mA nA mV
Pout
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 + 15H, BW < 30kHz Pout = 500mWRMS, G = 6dB, f = 1kHz RL = 8 + 15H, BW < 30kHz Efficiency Efficiency Pout = 1 WRMS, RL = 4 + 15H Pout = 0.65 WRMS, RL = 8+ 15H Power supply rejection ratio with inputs grounded (3) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain value (Rin in k) Internal resistance from standby to GND Pulse width modulator base frequency Signal to noise ratio (A-weighting) Pout = 0.6W, RL = 8 Wake-up time Standby time
273 k ----------------Ri n
2 0.1 78 88 62 56
300 k ----------------Ri n 327 k ----------------Ri n
%
%
PSRR CMRR Gain RSTBY FPWM SNR tWU tSTBY
dB dB V/V k kHz dB 10 10 ms ms
273
300 280 83 5 5
327
8/49
TS4961T Table 8.
Symbol
Electrical characteristics Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V, Tamb = 25 C (unless otherwise specified)(1) (continued)
Parameter Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H VN Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 83 57 83 61 81 58 87 62 77 56 85 63 80 57 VRMS Min. Typ. Max. Unit
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.
Symbol ICC ISTBY Voo
TS4961T
Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V, Tamb = 25 C (unless otherwise specified)(1)
Parameter Supply current No input signal, no load Standby current (2) No input signal, VSTBY = GND Output offset voltage No input signal, RL = 8 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 Min. Typ. 1.9 10 3 Max. 2.7 1000 25 Unit mA nA mV
Pout
0.7 1 0.5 0.6
W
Total harmonic distortion + noise Pout = 300 mWRMS, G = 6dB, 20Hz < f < 20kHz THD + N RL = 8 + 15H, BW < 30kHz Pout = 350mWRMS, G = 6dB, f = 1kHz RL = 8 + 15H, BW < 30kHz Efficiency Efficiency Pout = 0.7 WRMS, RL = 4 + 15H Pout = 0.45 WRMS, RL = 8+ 15H PSRR CMRR Gain RSTBY FPWM SNR tWU tSTBY Power supply rejection ratio with inputs grounded (3) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain value (Rin in k) Internal resistance from standby to GND Pulse width modulator base frequency Signal to noise ratio (A-weighting) Pout = 0.4W, RL = 8 Wake-up time Standby time
273 k ----------------Ri n
2 0.1 78 88 60 54
300 k ----------------Ri n 327 k ----------------Ri n
%
%
dB dB V/V k kHz dB 10 10 ms ms
273
300 280 82 5 5
327
10/49
TS4961T Table 9.
Symbol
Electrical characteristics Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V, Tamb = 25 C (unless otherwise specified)(1) (continued)
Parameter Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H VN Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter 83 57 83 61 81 58 87 62 77 56 85 63 80 57 VRMS Min. Typ. Max. Unit
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.
Symbol ICC ISTBY Voo
TS4961T
Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25 V, Tamb = 25 C (unless otherwise specified)
Parameter Supply current No input signal, no load Standby current (1) No input signal, VSTBY = GND Output offset voltage No input signal, RL = 8 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 Min. Typ. 1.7 10 3 Max. 2.4 1000 25 Unit mA nA mV
Pout
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 + 15H, BW < 30kHz Pout = 200mWRMS, G = 6dB, f = 1kHz RL = 8 + 15H, BW < 30kHz Efficiency Efficiency Pout = 0.47 WRMS, RL = 4 + 15H Pout = 0.3 WRMS, RL = 8+ 15H Power supply rejection ratio with inputs grounded (2) f = 217Hz, RL = 8 G=6dB, Vripple = 200mVpp , Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain value (Rin in k) Internal resistance from standby to GND Pulse width modulator base frequency Signal to noise ratio (A-weighting) Pout = 0.3W, RL = 8 Wake-up time Standby time
273 k ----------------Ri n
1 0.05 78 88 60 54
300 k ----------------Ri n 327 k ----------------Ri n
%
%
PSRR CMRR Gain RSTBY FPWM SNR tWU tSTBY
dB dB V/V k kHz dB 10 10 ms ms
273
300 280 80 5 5
327
12/49
TS4961T Table 10.
Symbol
Electrical characteristics Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25 V, Tamb = 25 C (unless otherwise specified) (continued)
Parameter Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H VN Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter
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.
Min.
Typ.
Max.
Unit
85 60 86 62 76 56 82 60 67 53 78 57 74 54 VRMS
13/49
Electrical characteristics Table 11.
Symbol ICC ISTBY Voo
TS4961T
Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V, Tamb = 25 C (unless otherwise specified)
Parameter Supply current No input signal, no load Standby current (1) No input signal, VSTBY = GND Output offset voltage No input signal, RL = 8 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 Total harmonic distortion + noise Pout = 150 mWRMS, G = 6dB, 20Hz < f < 20kHz RL = 8 + 15H, BW < 30kHz Efficiency Pout = 0.38 WRMS, RL = 4 + 15H Pout = 0.25 WRMS, RL = 8+ 15H Common mode rejection ratio f = 217Hz, RL = 8, G = 6dB, Vic = 200mVpp Gain value (Rin in k) Internal resistance from standby to GND Pulse width modulator base frequency Signal to noise ratio (A-weighting) Pout = 0.25W, RL = 8 Wake-up time Standby time
273 k ----------------R in
Min.
Typ. 1.7 10 3
Max.
Unit mA nA mV
Pout
0.42 0.61 0.3 0.38
W
THD + N
1
%
Efficiency
77 86 54
300 k ----------------Ri n 327 k ----------------Ri n
%
CMRR Gain RSTBY FPWM SNR tWU tSTBY
dB V/V k kHz dB ms ms
273
300 280 80 5 5
327
14/49
TS4961T Table 11.
Symbol
Electrical characteristics Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V, Tamb = 25 C (unless otherwise specified) (continued)
Parameter Output voltage noise f = 20Hz to 20kHz, G = 6dB Unweighted RL = 4 A-weighted RL = 4 Unweighted RL = 8 A-weighted RL = 8 Unweighted RL = 4 + 15H A-weighted RL = 4 + 15H VN Unweighted RL = 4 + 30H A-weighted RL = 4 + 30H Unweighted RL = 8 + 30H A-weighted RL = 8 + 30H Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter Unweighted RL = 4 + Filter A-weighted RL = 4 + Filter
1. Standby mode is active when VSTBY is tied to GND.
Min.
Typ.
Max.
Unit
85 60 86 62 76 56 82 60 67 53 78 57 74 54 VRMS
15/49
Electrical characteristics
TS4961T
2.2
Table 12.
Analog switch section
DC specifications
Value
Symbol
Parameter
VCC (V)
Test conditions
Tamb = 25 C Min Typ Max
-40 to 85 C Min 1.2 1.3 Max
Unit
2.5 VIH High level input voltage 2.7 - 3.0 3.3 - 3.6 4.3 2.5 VIL Low level input voltage 2.7 - 3.0 3.3 - 3.6 4.3 4.3 RPEAK, Switch Tn ON resistance Tn 3.6 3.0 2.7 4.3 RON,
Tn
1.2 1.3 1.4 1.5 0.25 0.25 0.30 0.40 1.10 VS = 0 V to VCC IS = 100 mA 1.15 1.25 1.35 10 VS at RPEAK IS = 100 mA 14 14 15 0.45 VS = 0 to VCC IS = 100 mA 0.45 0.50 0.55 VS = 0.3 or 4 V VSEL = 0 to 4.3 V VSEL = VCC or GND VSEL = 1.65 V 37 33 12 0.50 0.50 0.55 0.60 0.1 0.05 0.05 50 40 20 1.3 1.4 1.5 1.6
V 1.4 1.5 0.25 0.25 V 0.30 0.40 1.5 1.6 1.8 1.9
ON resistance match between Tn channels(1)
3.6 3.0 2.7 4.3
m
0.55 0.55 0.60 0.70 1 1 0.2 100 50 30 A A A A
RFLAT,
Tn
ON resistance flatness for Tn channels(2)
3.6 3.0 2.7
IOFF ISEL ICC
OFF state leakage current (Tn), (Dn) SEL leakage current Quiescent supply current Quiescent supply current low voltage driving
4.3 0 - 4.3 2.4 - 4.3
ICCLV
4.3
VSEL = 1.80 V VSEL = 2.60 V
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
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 0.45 0.30 0.30 65 85 55 55 30 30 30 Max
-40 to 85 C Min Max
Unit
2.5 - 2.7 - tPLH, tPHL Propagation delay 3.0 - 3.3 - 3.6 - 4.3 - 2.5 - 2.7 - tON Turn-ON time 3.0 - 3.3 - 3.6 - 4.3 - 2.5 - 2.7 - tOFF Turn-OFF time 3.0 - 3.3 - 3.6 - 4.3 - 2.5 - 2.7 - Q Charge injection 3.0 - 3.3 - 3.6 - 4.3 - CL = 100 pF RL = 1 M VGEN = 0 V RGEN = 0 VS = 1.5 V VS = 1.5 V
ns
90 65 65 40 40 40 ns ns
42 40 18 16 15 51 51 49
pC
17/49
Electrical characteristics Table 14. Analog switch characteristics (CL = 5 pF, RL = 50 , Tamb = 25 C)
Value Symbol Parameter VCC (V) Test conditions Tamb = 25 C Min VS=1 Vrms, F=1 MHz, RL = 50 VS=1 Vrms, F = 10 MHz, RL = 50 VS=1 Vrms, F = 1 MHz VS=1 Vrms, F = 10 MHz RL = 50 Signal = 0 dBm VCC = 0 V Typ Max -40 to 85 C Mi n Max
TS4961T
Unit
-80 dB -60
OIRRTn
Off isolation for switch T1,T2
2.5 - 4.3 -
-85 dB -74 58 9 MHz pF
Crosstalk between XtalkTn T1 and T2
2.5 - 4.3 -
BWTn CSEL
-3 dB bandwidth for switch T1, T2 Control pin input capacitance Tn port capacitance when the switch is enabled Tn port capacitance when the switch is disabled
2.5 - 4.3 -
CON,Tn
3.3
F = 1 MHz
113
pF
COFF,Tn
3.3
F = 1 MHz
85
pF
18/49
TS4961T
Electrical characteristics curves
3
3.1
Electrical characteristics curves
Audio amplifier section
The graphs included in this section use the following abbreviations:
RL + 15 H or 30 H = pure resistor + very low series resistance inductor. Filter = LC output filter (1 F+30 H for 4 and 0.5 F+6 0H for 8 ). All measurements done with Cs1 = 1 F and Cs2 = 100 nF except for PSRR where Cs1 is removed. Test diagram for audio amplifier measurements
Vcc
Figure 1.
1uF CSA
VCCA
GND Cin Rin 150k Cin In+
Out+ Audio Amplifier of the TS4961T
15uH or 30uH or LC Filter
4 or 8 Ohms 5th order RL 50kHz low pass filter
Rin 150k
InGNDA
Out-
GND Audio Measurement Bandwidth < 30kHz
Figure 2.
Test diagram for audio amplifier PSRR measurements
20Hz to 20kHz
100nF CSA VCCA GND Cin 4.7uF Cin 4.7uF GND GND 5th order 50kHz low pass filter Reference Rin 150k Audio Amplifier of the TS4961T Rin 150k GNDA InOutIn+ GND Out+
Vcc
15uH or 30uH or LC Filter
4 or 8 Ohms 5th order RL 50kHz low pass filter
RMS Selective Measurement Bandwidth=1% of Fmeas
19/49
Electrical characteristics curves
TS4961T
Figure 3.
Current consumption vs. power supply voltage
Figure 4.
Current consumption vs. standby voltage
No load Tamb=25C
Vcc = 3V No load Tamb=25C
Figure 5.
Output offset voltage vs. common mode input voltage
G = 6dB Tamb = 25C
Figure 6.
Efficiency vs. output power
Efficiency
Power Dissipation (mW)
Power Dissipation
Figure 7.
Efficiency vs. output power
Figure 8.
Output power vs. power supply voltage
3.5 3.0
Efficiency
Power Dissipation (mW)
Output power (W)
2.5 2.0 1.5 1.0 0.5 0.0
RL = 4 + 15H F = 1kHz BW < 30kHz Tamb = 25C THD+N=10%
Power Dissipation
THD+N=1%
2.5
3 .0
3.5 Vcc (V)
4 .0
20/49
TS4961T
Electrical characteristics curves
Figure 9.
Output power vs. power supply voltage
Figure 10. PSSR vs. frequency
2.0
Output power (W)
1.5
RL = 8 + 15H F = 1kHz BW < 30kHz Tamb = 25C THD+N=10%
0 -10 -20 -30 -40 -50
1.0
0.5 THD+N=1%
-60 -70
0.0
2.5
3 .0
3.5 Vcc (V)
4 .0
-80
20
100
1000
10000 20k
Figure 11. PSSR vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 20 100 1000 10000 20k
Figure 12. PSSR vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 20 100 1000 10000 20k
Figure 13. PSSR vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 20 100 1000 10000 20k
Figure 14. PSSR vs. frequency
0 -10 -20 -30 -40 -50 -60 -70 -80 20 100 1000 10000 20k
21/49
Electrical characteristics curves
TS4961T
Figure 15. PSSR vs. frequency
Figure 16. PSSR vs. common mode input voltage
Vripple = 200mVpp F = 217Hz, G = 6dB RL 4 + 15H Tamb = 25C
0 -10 -20 -30 -40 -50 -60 -70 -80 20 100 1000 10000 20k
Figure 17. CMRR vs. common mode input voltage
Vicm = 200mVpp F = 217Hz G = 6dB RL 4 + 15H Tamb = 25C
Figure 18. CMRR vs. frequency
RL=4 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Vcc=3.6V, 2.5V
20
20k
Figure 19. CMRR vs. frequency
Figure 20. CMRR vs. frequency
RL=4 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Vcc=3.6V, 2.5V
RL=4 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Vcc=3.6V, 2.5V
20
20k
20
20k
22/49
TS4961T
Electrical characteristics curves
Figure 21. CMRR vs. frequency
Figure 22. CMRR vs. frequency
RL=8 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Vcc=3.6V, 2.5V
RL=8 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Vcc=3.6V, 2.5V
20
20k
20
20k
Figure 23. CMRR vs. frequency
Figure 24. THD+N vs. output power
RL=8 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Vcc=3.6V, 2.5V
RL = 4 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
20
20k
3
Figure 25. THD+N vs. output power
Figure 26. THD+N vs. output power
RL = 4 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
RL = 8 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
3
2
23/49
Electrical characteristics curves
TS4961T
Figure 27. THD+N vs. output power
Figure 28. THD+N vs. output power
RL = 8 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
RL = 4 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
2
3
Figure 29. THD+N vs. output power
Figure 30. THD+N vs. output power
RL = 4 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
RL = 8 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
3
2
Figure 31. THD+N vs. output power
Figure 32. THD+N vs. frequency
RL=4 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C
RL = 8 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25C
Vcc=3.6V Vcc=2.5V
Po=0.35W
Po=0.17W
2
50
20k
24/49
TS4961T
Electrical characteristics curves
Figure 33. THD+N vs. frequency
RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C
Figure 34. THD+N vs. frequency
RL=4 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C
Po=0.35W
Po=0.85W
Po=0.17W
Po=0.42W
50
20k
50
20k
Figure 35. THD+N vs. frequency
RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C
Figure 36. THD+N vs. frequency
RL=8 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C
Po=0.85W
Po=0.18W
Po=0.1W
Po=0.42W
50
20k
50
20k
Figure 37. THD+N vs. frequency
RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C
Figure 38. THD+N vs. frequency
RL=8 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C
Po=0.45W
Po=0.18W
Po=0.1W
Po=0.22W
50
20k
50
20k
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Electrical characteristics curves
TS4961T
Figure 39. THD+N vs. frequency
RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C
Figure 40. Gain vs. frequency
Po=0.45W
Vcc=3.6V & 2.5V
Po=0.22W
RL=4 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20k 20 20k
50
Figure 41. Gain vs. frequency
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 = 25C 20 20k 20
RL=4 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20k
Figure 43. Gain vs. frequency
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 = 25C 20 20k 20
RL=8 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20k
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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 = 25C 20 20k 20
RL=No Load G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20k
Figure 47. Startup & shutdown time VCC = 3 V, Figure 48. Startup & shutdown time VCC = 3 V, G = 6 dB, Cin = 1 F (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
TS4961T
3.2
Analog switch section
The graphs included in this section use the following abbreviations.
RL + 15 H or 30 H = pure resistor + very low series resistance inductor. Filter = LC output filter (1 F + 30 H for 4 and 0.5 F + 6 0H for 8 ). All measurements done with Cs1 = 1 F and Cs2 = 100 nF except for PSRR where Cs1 is removed.
Figure 50. Test diagram for switch measurements
Vcc CSS VCCS GND 100nF 4 or 8 Ohms D1 Switch section of the TS4961T D2 T2 T1 RL
SL1 Vcc
SL2
GNDS GND
Measurement Audio Amplifier
Audio Measurement Bandwidth < 30kHz
Figure 51. Test diagram for isolation switch measurements
Vcc CSS VCCS GND 100nF
D1 Switch section of the TS4961T D2
T1 RL T2
SL1 GND
SL2
GNDS GND
Measurement Audio Amplifier
Audio Measurement Bandwidth < 30kHz
28/49
TS4961T Figure 52. ON resistance
Electrical characteristics curves
IDS
V VCC
T D VS
VCC
SEL GND
Figure 53. OFF leakage
VCC IT(Off) A VS ID(Off) D A VD
T
GND
SEL GND
29/49
Electrical characteristics curves Figure 54. OFF isolation
TS4961T
VCC
T D GVS 50
VOUT
ND
SEL GND
Figure 55. Bandwidth
VCC
T D V VS 50
VOUT
CC
SEL GND
30/49
TS4961T Figure 56. Switch-to-switch crosstalk
Electrical characteristics curves
VCC
T1 D1 V VS 50
CC
SEL1 T2 D2 VOUT 50
V
CC
SEL2 GND
Figure 57. Test circuit
Note:
1 2 3
CL = 5/35 pF or equivalent (includes jig and probe capacitance). RL = 50 or equivalent. RT = ZOUT of pulse generator (typically 50 ).
31/49
Electrical characteristics curves
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 D RL
VOUT CL
SEL V IN GND
Figure 60. Turn on, turn off time test circuit schematics
VCC
Figure 61. Turn on, turn off time
VS
T D RL
VOUT CL
SEL V IN GND
Figure 62. THD+N vs. output power
Figure 63. THD+N vs. output power
RL = 4 F = 100Hz BW < 30kHz Tamb = 25C
Vcc=3.3V Vcc=2.5V
Vcc=4.3V
RL = 8 F = 100Hz BW < 30kHz Tamb = 25C
Vcc=3.3V Vcc=2.5V
Vcc=4.3V
32/49
TS4961T
Electrical characteristics curves
Figure 64. THD+N vs. output power
Figure 65. THD+N vs. output power
RL = 4 F = 1kHz BW < 30kHz Tamb = 25C
Vcc=3.3V Vcc=2.5V
Vcc=4.3V
RL = 8 F = 1kHz BW < 30kHz Tamb = 25C
Vcc=3.3V Vcc=2.5V
Vcc=4.3V
Figure 66. THD+N vs. output power
Figure 67. THD+N vs. output power
RL = 4 F = 10kHz BW < 30kHz Tamb = 25C
Vcc=3.3V Vcc=2.5V
Vcc=4.3V
RL = 8 F = 10kHz BW < 30kHz Tamb = 25C
Vcc=3.3V Vcc=2.5V
Vcc=4.3V
Figure 68. THD+N vs. frequency
RL=4 Vcc=2.5V Bw < 30kHz Tamb = 25C
Figure 69. THD+N vs. frequency
RL=8 Vcc=2.5V Bw < 30kHz Tamb = 25C
Po=10mW
Po=15mW
Po=2mW
Po=5mW
50
20k
50
20k
33/49
Electrical characteristics curves
TS4961T
Figure 70. THD+N vs. frequency
RL=4 Vcc=3.3V Bw < 30kHz Tamb = 25C
Figure 71. THD+N vs. frequency
RL=8 Vcc=3.3V Bw < 30kHz Tamb = 25C
Po=120mW
Po=230mW
Po=35mW
Po=50mW
Po=10mW
Po=20mW
50
20k
50
20k
Figure 72. THD+N vs. frequency
RL=4 Vcc=4.3V Bw < 30kHz Tamb = 25C
Figure 73. THD+N vs. frequency
RL=8 Vcc=4.3V Bw < 30kHz Tamb = 25C
Po=260mW
Po=420mW
Po=90mW
Po=130mW
Po=30mW
Po=50mW
50
20k
50
20k
Figure 74. Isolation vs. frequency
Vcc=2.5V or 3.3V or 4.3V Bw < 30kHz Tamb = 25C RL=20k RL=100k RL=600 RL=300
RL=4 and 8
20
20k
34/49
TS4961T
Application component information
4
Application component information
Table 15. Component information
Functional description Bypass supply capacitor. Install as close as possible to the VCCA pin of the TS4961T to minimize high-frequency ripple. A 1 uF ceramic capacitor should be added to enhance power supply filtering at high frequencies (see below). Bypass supply capacitor. Install as close as possible to the VCCS pin of the TS4961T to minimize high-frequency ripple. A 100 nF ceramic capacitor should be added to enhance power supply filtering at high frequencies. Input resistor to program the TS4961T differential gain (gain = 300 k/RIN with RIN in k). 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).
Component CSA
CSS
RIN
CIN
Figure 75. Typical application schematics
CSA
2.4 to 4.3V VCCA /STDBY 12 6 GNDA 7
TS4961T
OUT+
CIN
BB
RIN IN+
16 15 IN11 4 13 3 Analog Switch 2 VCCS 7 GNDS
5
Class D Amplifier
CIN
RIN
SL1 SL2
8
OUT-
D1 CODEC D2
1 9
T1 T2
4-8 ohms
2.4 to 4.3V
CSS
35/49
Application component information
TS4961T
4.1
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 C C × R i n + 2 × V I C × 150 k V i c m = ----------------------------------------------------------------------------2 × ( R i n + 150 k ) (V)
with
In + In V I C = --------------------2
+ -
(V)
and the result of the calculation must be in the range:
0.5 V V i c m V C C 0.8 V
Due to the +/-9% tolerance on the 150 k resistor, it is also important to check Vicm in these conditions:
V C C × R i n + 2 × V I C × 136.5 k V C C × R i n + 2 × V I C × 163.5 k ---------------------------------------------------------------------------------- V i c m ---------------------------------------------------------------------------------2 × ( R i n + 136.5 k ) 2 × ( R i n + 163.5 k )
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
Application component information
4.2
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 C L = ------------------------------------2 × Ri n × Ci n (Hz)
Therefore, for a desired cut-off frequency FCL, Cin is calculated as follows:
1 C i n = --------------------------------------2 × Ri n × FC L (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. The 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 F ceramic capacitor is enough, but it must be located very close to the 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 F/6.3 V capacitor used at 5 V, loses about 50% of its value. In fact, with a 5 V power supply voltage, the decoupling value is about 0.5 F instead of 1 F. 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 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
TS4961T
4.5
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 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 Ve VCCA 1 2 Stdby 300k Cin GND GND Cin Rin Rin 150k 15 InIn+ 16 Internal Bias Out+ 5 Output PWM 150k OutOscillator GNDA H Bridge SPEAKER 8 Csa 1uF GND
+
TS4961T(Audio Amplifier Part)
7 GND
All formulas are identical except for the gain (with Rin in k) :
AV
sin g l e
Ve 300 = ------------------------------ = --------+ Ri n Out Out
Due to the internal resistor tolerance, AVsingle is in the range of:
273 327 --------- A V --------sin g l e Ri n Ri n
In the event that multiple single-ended inputs are summed, it is important that the impedance on both TS4961 inputs (In- and In+) be equal.
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TS4961T
Application component information Figure 77. Typical application schematics with multiple single-ended inputs
Standby Vcc
Vek Cink Rink 12 Stdby 300k Cin1 Rin1 150k 15 InIn+ 16 6 VCCA Internal Bias Out+ 5 Output PWM 150k OutH Bridge SPEAKER 8
Csa 1uF
GND
Ve1
GND
+
GND
Ceq
Req
GND
Oscillator
TS4961T (Audio Amplifier Part)
GNDA 7
GND
We have the following equations.
+ 300 300 O u t O u t = V e 1 × ------------ + ...+ V e k × -----------Ri n 1 Ri n k k (V)
Ce q =
Ci n j j=1
(F)
C
inj
1 = -----------------------------------------------------2× × R × F inj CLj
1R e q = -----------------k
j =1
-- ---R-i--n 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 inputs.
39/49
Application component information
TS4961T
4.8
Output filter considerations
The TS4961T is designed to operate without an output filter. However, due to very sharp transients on the TS4961T output, EMI radiated emissions may cause some standard compliance issues. These EMI standard compliance issues can appear if the distance between the 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 output pins and the speaker terminals. Use ground planes for shielding sensitive wires. Place, as close as possible to the 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 From TS4961T output about 100pF To speaker
Gnd
In the case where the distance between the 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.
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TS4961T
Application component information
4.9
4.9.1
Examples with summed inputs
Example 1: dual differential inputs
Figure 79. Typical application schematics with dual differential inputs
Vcc Standby
12 Stdby Internal Bias Out+ 5 Output PWM 150k H Bridge SPEAKER 8 OutOscillator 150k 6 VCCA
Csa 1uF
E2+ E1+ E1E2-
R2 15 InIn+ 16
300k
GND
R1 R1
+
R2
TS4961T (Audio Amplifier Part)
GNDA 7
GND
With (Ri in k):
t Out 300 A V = O-u-------------------- = --------------- -1 + R1 E1 E1 00 O ---t -- O u t A V = -----u-------------------- = 3-------2 + R2 E2 E2 V C C × R 1 × R 2 + 300 × ( V I C 1 × R 2 + V I C 2 × R 1 ) 0.5 V ------------------------------------------------------------------------------------------------------------------------------- V C C 0.8 V 300 × ( R 1 + R 2 ) + 2 × R 1 × R 2 E1 + E1 E2 + E2 V I C = ------------------------ and V I C = -----------------------1 2 2 2
+ + + + -
41/49
Application component information
TS4961T
4.9.2
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
12 Stdby Internal Bias Out+ 5 Output PWM 150k R1 OutOscillator H Bridge SPEAKER 8 150k R1 R2 15 6 VCCA
Csa 1uF
E2+
C1
R2
300k
GND
E1 E2-
16
InIn+ +
GND C1
TS4961T (Audio Amplifier Part)
GNDA 7
GND
With (Ri in k):
300 A V = O-u-------------------- = ---------------t -- O u t 1 + R1 E1 300 A V = O-u-------------------- = ---------------t -- O u t 2 + R2 E2 E2 1 C 1 = ------------------------------------2 × R1 × FC L (F)
+ + -
42/49
TS4961T
Application component information
4.10
Using the audio amplifier and switch on the same speaker
The 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
CSA
2.4 to 4.3V VCCA /STDBY 12 6 GNDA 7
TS4961T
OUT+
CIN
Line Out Source
RIN IN+
16 15 IN11 4 13 3 Analog Switch 2 VCCS 7 GNDS
5
Class D Amplifier
CIN
RIN
SL1 SL2
8
OUT-
Speaker Out Source
D1 D2
1 9
T1 T2
4-8 ohms
2.4 to 4.3V
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 audio amplifier and to the external audio amplifier that provides the speaker-out signal.
43/49
Application component information Figure 82. Timing of switching between two audio sources
TS4961T
High
/STDBY
Low t
High
SL1 & SL2
Low t
Delay >10ms
Delay >1ms Speaker Connected to the Speaker Out Source
Status
Speaker Not Connected
Speaker Connected to the Line Out Source
Speaker Connected to the Line Out Source
44/49
TS4961T
Package information
5
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. 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 Figure 83. QFN16 3 x 3 mm package mechanical drawing
TS4961T
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 3 x 3 mm package mechanical data
Dimensions Ref. Min. A A1 A3 b D D1 D2 E E1 E2 e L ddd 1.70 0.45 0.30 1.70 2.85 0.18 2.85 0.80 Millimeters Typ. 0.90 0.02 0.20 0.25 3.00 1.50 1.80 3.00 1.50 1.80 0.50 0.40 1.90 0.55 0.50 0.08 0.067 0.018 0.012 1.90 3.15 0.067 0.112 0.30 3.15 0.007 0.112 Max. 1.00 0.05 Min. 0.031 Inches Typ. 0.035 0.001 0.008 0.01 0.118 0.059 0.071 0.118 0.059 0.071 0.020 0.016 0.075 0.022 0.020 0.003 0.075 0.124 0.012 0.124 Max. 0.039 0.002
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TS4961T Figure 84. QFN16 3 x 3 mm package recommended footprint
Package information
Note:
The substrate pad should be tied to the PCB GND.
47/49
Ordering information
TS4961T
6
Ordering information
Table 17. Order codes
Temperature range -40C to +85C Package QFN16 Packing Tape & reel Marking K61T
Order code TS4961TIQT
7
Revision history
Table 18.
Date 16-Sep-2008
Document revision history
Revision 1 Initial release. Changes
48/49
TS4961T
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