TS4962M
3W filter-free class D audio power amplifier
Features
Operating from VCC = 2.4V to 5.5V Standby mode active low Output power: 3W into 4 and 1.75W into 8 with 10% THD+N max and 5V power supply. Output power: 2.3W @5V or 0.75W @ 3.0V into 4 with 1% THD+N max. Output power: 1.4W @5V or 0.45W @ 3.0V into 8 with 1% THD+N max. Adjustable gain via external resistors Low current consumption 2mA @ 3V Efficiency: 88% typ. Signal to noise ratio: 85dB typ. PSRR: 63dB typ. @217Hz with 6dB gain PWM base frequency: 250kHz
Pin connections
IN+ 1/A1 VDD 4/B1 IN7/C1 GND 2/A2 VDD 5/B2 STBY 8/C2 OUT3/A3 GND 6/B3 OUT+ 9/C3
IN+: positive differential input IN-: negative differential input VDD: analog power supply GND: power supply ground STBY: standby pin (active low) OUT+: positive differential output OUT-: negative differential output
Block diagram
B1 Vcc C2 Stdby 300k Internal Bias 150k Out+ C3 Output PWM H Bridge 150k Oscillator A3 OutB2
Low pop & click noise Thermal shutdown protection Available in flip-chip 9 x 300m (Pb-free)
C1 InIn+ A1
+
Description
The TS4962M is a differential Class-D BTL power amplifier. It is able to drive up to 2.3W into a 4 load and 1.4W into a 8 load at 5V. It achieves outstanding efficiency (88%typ.) compared to classical Class-AB audio amps. The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5ms. A standby function (active low) allows the reduction of current consumption to 10nA typ.
GND A2 B3
Applications
Cellular phone PDA Notebook PC
January 2007
Rev 4
1/41
www.st.com 41
Contents
TS4962M
Contents
1 2 3 4 5 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 29
For example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Wake-up time: (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Different examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 1: Dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Example 2: One differential input plus one single-ended input . . . . . . . . . . . . . . . 34
6 7 8 9 10
Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2/41
TS4962M
Absolute maximum ratings
1
Absolute maximum ratings
Table 1.
Symbol VCC Vin Toper Tstg Tj Rthja Pdiss ESD ESD Latch-up VSTBY
Absolute maximum ratings
Parameter Supply voltage(1), (2) Input voltage (3) Operating free-air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient Power dissipation Human body model Machine model Latch-up immunity Standby pin voltage maximum voltage (6) Lead temperature (soldering, 10sec)
(4)
Value 6 GND to VCC -40 to + 85 -65 to +150 150 200 Internally Limited(5) 2 200 200 GND to VCC 260
Unit V V C C C C/W
kV V mA V C
1. Caution: This device is not protected in the event of abnormal operating conditions, such as for example, 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. The magnitude of the input signal must never exceed VCC + 0.3V / GND - 0.3V. 4. The device is protected in case of over temperature by a thermal shutdown active @ 150C. 5. Exceeding the power derating curves during a long period causes abnormal operation. 6. The magnitude of the standby signal must never exceed VCC + 0.3V / GND - 0.3V.
Table 2.
Symbol VCC VIC VSTBY RL Rthja
Operating conditions
Parameter Supply voltage(1) Common mode input voltage Standby voltage input: (3) Device ON Device OFF Load resistor Thermal resistance junction to ambient (5) 1.4 VSTBY VCC GND VSTBY 0.4 (4) 4 90 V C/W range(2) Value 2.4 to 5.5 0.5 to VCC - 0.8 Unit V V
1. For VCC from 2.4V to 2.5V, the operating temperature range is reduced to 0C Tamb 70C. 2. For VCC from 2.4V to 2.5V, the common mode input range must be set at VCC/2. 3. Without any signal on VSTBY, the device will be in standby. 4. Minimum current consumption is obtained when VSTBY = GND. 5. With heat sink surface
= 1 2 5 m m 2.
3/41
Application component information
TS4962M
2
Application component information
Table 3. Component information
Functional description Bypass supply capacitor. Install as close as possible to the TS4962M to minimize high-frequency ripple. A 100nF ceramic capacitor should be added to enhance the power supply filtering at high frequency. Input resistor to program the TS4962M differential gain (gain = 300k/Rin with Rin in k). Due to common mode feedback, these input capacitors are optional. However, they can be added to form with Rin a 1st order high pass filter with -3dB cut-off frequency = 1/(2**Rin*Cin).
Component Cs
Rin Input capacitor
Figure 1.
Typical application schematics
Vc c Vc c
B1 Vcc C2 Stdby 300k Internal Bias 150k
B2
In+
Cs 1u
Out+ C3 Output PWM H Bridge
GND
GND GND
+
Rin
C1 InIn+
Differential Input InA1 Rin Input capacitors are optional
+
150k Oscillator
SPEAKER A3 Out-
GND
GND TS4962 A2 B3
GND
Vc c Vc c
B1 Vcc C2 Stdby 300k Internal Bias 150k
B2
In+
Cs 1u 4 Ohms LC Output Filter
Out+ C3 Output PWM H Bridge
GND
GND GND
15H
+
Rin
C1 InIn+
Differential Input InA1 Rin
+
150k Oscillator
2F
GND
Load
Input capacitors are optional
GND
A3 Out-
2F 15H
TS4962 GND A2 B3
GND
30H
1F
GND
1F 30H 8 Ohms LC Output Filter
4/41
TS4962M
Electrical characteristics
3
Table 4.
Symbol ICC ISTBY VOO
Electrical characteristics
VCC = +5V, GND = 0V, VIC = 2.5V, tamb = 25C (unless otherwise specified)
Parameter Supply current Standby current
(1)
Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8 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 Pout = 900mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8 + 15H, BW < 30kHz Pout = 1WRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz Pout = 2WRMS, RL = 4 + 15H Pout =1.2WRMS, RL = 8+ 15H F = 217Hz, RL = 8 G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp Rin in k
Min.
Typ. 2.3 10 3 2.3 3 1.4 1.75 1 0.4 78 88 63
M ax. 3.3 1000 25
Unit mA nA mV
Output offset voltage
Pout
Output power
W
Total harmonic THD + N distortion + noise
%
Efficiency Efficiency Power supply rejection ratio with inputs grounded (2) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time
%
PSRR
dB
CMRR Gain RSTBY FPWM SNR tWU tSTBY
57
273 k ----------------Ri n 300 k ----------------Ri n 327 k ----------------R in
dB V/V k kHz dB 10 10 ms ms
273 180 A-weighting, Pout = 1.2W, RL = 8
300 250 85 5 5
327 320
5/41
Electrical characteristics Table 4.
Symbol
TS4962M
VCC = +5V, GND = 0V, VIC = 2.5V, tamb = 25C (unless otherwise specified) (continued)
Parameter Conditions 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 Min. Typ. M ax. Unit
85 60 86 62 83 60 88 64 78 57 87 65 82 59 VRMS
VN
Output voltage noise
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 @ F = 217Hz.
6/41
TS4962M Table 5.
Symbol ICC ISTBY VOO
Electrical characteristics VCC = +4.2V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1)
Parameter Supply current Standby current
(2)
Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8 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 Pout = 600mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8 + 15H, BW < 30kHz Pout = 700mWRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz Pout = 1.45WRMS, RL = 4 + 15H Pout =0.9WRMS, RL = 8+ 15H F = 217Hz, RL = 8 G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp Rin in k
Min.
Typ. 2.1 10 3 1.6 2 0.95 1.2 1 0.35 78 88 63
Max. 3 1000 25
Unit mA nA mV
Output offset voltage
Pout
Output power
W
Total harmonic THD + N distortion + noise
%
Efficiency Efficiency Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-uptime Standby time
%
PSRR
dB
CMRR Gain RSTBY FPWM SNR tWU tSTBY
57
273 k ----------------R in 300 k ----------------R in 327 k ----------------R in
dB V/V k kHz dB 10 10 ms ms
273 180 A-weighting, Pout = 0.9W, RL = 8
300 250 85 5 5
327 320
7/41
Electrical characteristics Table 5.
Symbol
TS4962M
VCC = +4.2V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1)
Parameter Conditions 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 Min. Typ. Max. Unit
85 60 86 62 83 60 88 64 78 57 87 65 82 59 VRMS
VN
Output voltage noise
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. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 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 @ F = 217Hz.
8/41
TS4962M Table 6.
Symbol ICC ISTBY VOO
Electrical characteristics VCC = +3.6V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1)
Parameter Supply current Standby current
(2)
Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8 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 Pout = 500mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8 + 15H, BW < 30kHz Pout = 500mWRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz Pout = 1WRMS, RL = 4 + 15H Pout =0.65WRMS, RL = 8+ 15H F = 217Hz, RL = 8 G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp Rin in k
Min.
Typ. 2 10 3 1.15 1.51 0.7 0.9 1 0.27 78 88 62
Max. 2.8 1000 25
Unit mA nA mV
Output offset voltage
Pout
Output power
W
Total harmonic THD + N distortion + noise
%
Efficiency Efficiency Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-uptime Standby time
%
PSRR
dB
CMRR Gain RSTBY FPWM SNR tWU tSTBY
56
273 k ----------------R in 300 k ----------------R in 327 k ----------------R in
dB V/V k kHz dB 10 10 ms ms
273 180 A-weighting, Pout = 0.6W, RL = 8
300 250 83 5 5
327 320
9/41
Electrical characteristics Table 6.
Symbol
TS4962M
VCC = +3.6V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1)
Parameter Conditions 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 Min. Typ. Max. Unit
83 57 83 61 81 58 87 62 77 56 85 63 80 57 VRMS
VN
Output voltage noise
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. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 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 @ F = 217Hz.
10/41
TS4962M Table 7.
Symbol ICC ISTBY VOO
Electrical characteristics VCC = +3V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1)
Parameter Supply current Standby current
(2)
Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8 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 Pout = 350mWRMS, G = 6dB, 20Hz < F < 20kHz RL = 8 + 15H, BW < 30kHz Pout = 350mWRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz Pout = 0.7WRMS, RL = 4 + 15H Pout = 0.45WRMS, RL = 8+ 15H F = 217Hz, RL = 8 G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp Rin in k
Min.
Typ. 1.9 10 3 0.75 1 0.5 0.6 1 0.21 78 88 60
Ma x . 2.7 1000 25
Unit mA nA mV
Output offset voltage
Pout
Output power
W
Total harmonic THD + N distortion + noise
%
Efficiency Efficiency Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time
%
PSRR
dB
CMRR Gain RSTBY FPWM SNR tWU tSTBY
54
273 k ----------------R in 300 k ----------------R in 327 k ----------------R in
dB V/V k kHz dB 10 10 ms ms
273 180 A-weighting, Pout = 0.4W, RL = 8
300 250 82 5 5
327 320
11/41
Electrical characteristics Table 7.
Symbol
TS4962M
VCC = +3V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)(1)
Parameter Conditions 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 Min. Typ. Ma x . Unit
83 57 83 61 81 58 87 62 77 56 85 63 80 57 VRMS
VN
Output Voltage Noise 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. All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 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 @ F = 217Hz.
12/41
TS4962M Table 8.
Symbol ICC ISTBY VOO
Electrical characteristics VCC = +2.5V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)
Parameter Supply current Standby current
(1)
Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8 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 Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8 + 15H, BW < 30kHz Pout = 200WRMS, G = 6dB, F = 1kHz, RL = 8 + 15H, BW < 30kHz Pout = 0.47WRMS, RL = 4 + 15H Pout = 0.3WRMS, RL = 8+ 15H F = 217Hz, RL = 8 G=6dB, , Vripple = 200mVpp F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp Rin in k
Min.
Typ. 1.7 10 3 0.52 0.71 0.33 0.42 1 0.19 78 88 60
Max. 2.4 1000 25
Unit mA nA mV
Output offset voltage
Pout
Output power
W
Total harmonic THD + N distortion + noise
%
Efficiency Efficiency Power supply rejection ratio with inputs grounded (2) Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time
%
PSRR
dB
CMRR Gain RSTBY FPWM SNR tWU tSTBY
54
273 k ----------------R in 300 k ----------------R in 327 k ----------------R in
dB V/V k kHz dB 10 10 ms ms
273 180 A-weighting, Pout = 1.2W, RL = 8
300 250 80 5 5
327 320
13/41
Electrical characteristics Table 8.
Symbol
TS4962M
VCC = +2.5V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)
Parameter Conditions 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 Min. Typ. Max. Unit
85 60 86 62 76 56 82 60 67 53 78 57 74 54 VRMS
VN
Output Voltage Noise 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 @ F = 217Hz.
14/41
TS4962M Table 9.
Symbol ICC ISTBY VOO
Electrical characteristics VCC = +2.4V, GND = 0V, VIC = 2.5V, Tamb = 25C (unless otherwise specified)
Parameter Supply current Standby current
(1)
Conditions No input signal, no load No input signal, VSTBY = GND No input signal, RL = 8 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 Pout = 200mWRMS, G = 6dB, 20Hz < F< 20kHz RL = 8 + 15H, BW < 30kHz Pout = 0.38WRMS, RL = 4 + 15H Pout = 0.25WRMS, RL = 8+ 15H F = 217Hz, RL = 8, G = 6dB, Vicm = 200mVpp Rin in k
Min.
Typ. 1.7 10 3 0.48 0.65 0.3 0.38 1 77 86 54
Max.
Unit mA nA mV
Output offset voltage
Pout
Output power
W
THD + N
Total harmonic distortion + noise
% % dB
327 k ----------------Ri n
Efficiency Efficiency CMRR Gain RSTBY FPWM SNR tWU tSTBY Common mode rejection ratio Gain value Internal resistance from Standby to GND Pulse width modulator base frequency Signal to noise ratio Wake-up time Standby time
273 k ----------------Ri n
300 k ----------------Ri n
V/V k kHz dB ms ms
273
300 250
327
A Weighting, Pout = 1.2W, RL = 8
80 5 5
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 Output voltage noise 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.
85 60 86 62 76 56 82 60 67 53 78 57 74 54 VRMS
15/41
Electrical characteristic curves
TS4962M
4
Electrical characteristic curves
The graphs included in this section use the following abbreviations:
RL + 15H or 30H = pure resistor + very low series resistance inductor Filter = LC output filter (1F+30H for 4 and 0.5F+60H for 8) All measurements done with Cs1=1F and Cs2=100nF except for PSRR where Cs1 is removed. Test diagram for measurements
Vcc 1uF Cs1 + 100nF Cs2
Figure 2.
Cin
GND Rin
GND In+ Out+ 15uH or 30uH TS4962 or LC Filter Out4 or 8 Ohms 5th order RL 50kHz low pass filter
150k Cin
Rin 150k
In-
GND Audio Measurement Bandwidth < 30kHz
Figure 3.
Test diagram for PSRR measurements
100nF C s2 20Hz to 20kHz Vcc
GND 4.7uF GND Rin In+ 150k TS4962 4.7uF Rin 150k GND GND 5th order 50kHz low pass filter Reference RMS Selective Measurement Bandwidth=1% of Fmeas InOutOut+ 15uH or 30uH or LC Filter 4 or 8 Ohms 5th order RL 50kHz low pass filter
16/41
TS4962M
Electrical characteristic curves
Figure 4.
Current consumption vs. power supply voltage
Figure 5.
Current consumption vs. standby voltage
2.5 No load Tamb=25C
Current Consumption (mA)
2.5
2.0
Current Consumption (mA)
2.0
1.5
1.5
1.0
1.0
0.5
0.5
0.0
0.0
Vcc = 5V No load Tamb=25C 0 1 2 3 4 5 Standby Voltage (V)
0
1
2
3
4
5
Power Supply Voltage (V)
Figure 6.
Current consumption vs. standby voltage
Figure 7.
Output offset voltage vs. common mode input voltage
2.0
10 G = 6dB Tamb = 25C
Current Consumption (mA)
1.5
Voo (mV)
8
6
Vcc=5V Vcc=3.6V
1.0
4
0.5 Vcc = 3V No load Tamb=25C 0.5 1.0 1.5 2.0 2.5 3.0 Standby Voltage (V)
2
Vcc=2.5V
0.0 0.0
0 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)
Figure 8.
100
Efficiency vs. output power
Figure 9.
100
Efficiency vs. output power
200 Efficiency
600
Power Dissipation (mW)
500 400 300
150 Efficiency (%) 60 100 40 Power Dissipation Vcc=3V 50 RL=4 + 15H F=1kHz THD+N1% 0 0.2 0.3 0.4 0.5 0.6 0.7 Output Power (W)
60
40 200 Vcc=5V RL=4 + 15H 100 F=1kHz THD+N1% 0 1.0 1.5 2.0 2.3 Output Power (W) Power Dissipation
20
20
0 0.0
0.5
0 0.0
0.1
Power Dissipation (mW)
80
Efficiency
80
Efficiency (%)
17/41
Electrical characteristic curves
TS4962M
Figure 10. Efficiency vs. output power
100 150
Figure 11. Efficiency vs. output power
100 75
Efficiency
Efficiency
Efficiency (%)
Efficiency (%)
60
100
50 60
40
Power Dissipation Vcc=5V RL=8 + 15H F=1kHz THD+N1% 0.2 0.4 0.6 0.8 Output Power (W) 1.0 1.2
40 Power Dissipation 25 Vcc=3V RL=8 + 15H F=1kHz THD+N1% 0.4 0 0.5
50
20
20
0 0.0
0 1.4
0 0.0
0.1
0.2 0.3 Output Power (W)
Figure 12. Output power vs. power supply voltage
3.5 RL = 4 + 15H F = 1kHz 3.0 BW < 30kHz Tamb = 25C 2.5 2.0 1.5 THD+N=1% 1.0 0.5 0.0
Figure 13. Output power vs. power supply voltage
2.0
THD+N=10%
Output power (W)
RL = 8 + 15H F = 1kHz BW < 30kHz 1.5 Tamb = 25C
Output power (W)
THD+N=10% 1.0
0.5
THD+N=1%
2.5
3.0
3.5
4.0 Vcc (V)
4.5
5.0
5.5
0.0
2.5
3.0
3.5
4.0 Vcc (V)
4.5
5.0
5.5
Figure 14. PSRR vs. frequency
0 -10 -20
PSRR (dB)
Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 4 + 15H R/R0.1% Tamb = 25C
Figure 15. PSRR vs. frequency
0 -10 -20
PSRR (dB)
Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 4 + 30H R/R0.1% Tamb = 25C
-30 -40
-30 -40
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
-50 -60 -70 -80 20 100 1000 Frequency (Hz) 10000 20k
-50 -60 -70 -80 20 100 1000 Frequency (Hz) 10000 20k
18/41
Power Dissipation (mW)
Power Dissipation (mW)
80
80
TS4962M
Electrical characteristic curves
Figure 16. PSRR vs. frequency
0 -10 -20
PSRR (dB)
Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 4 + Filter R/R0.1% Tamb = 25C
Figure 17. PSRR vs. frequency
0 -10 -20
PSRR (dB)
Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 8 + 15H R/R0.1% Tamb = 25C
-30 -40
-30 -40 -50 -60 -70
Vcc=5V, 3.6V, 2.5V
-50 -60 -70 -80 20 100 1000 Frequency (Hz) 10000 20k
Vcc=5V, 3.6V, 2.5V
-80
20
100
1000 Frequency (Hz)
10000 20k
Figure 18. PSRR vs. frequency
0 -10 -20
PSRR (dB)
Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F RL = 8 + 30H R/R0.1% Tamb = 25C
Figure 19. PSRR vs. frequency
0 -10 -20
PSRR (dB)
Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7F R/R0.1% RL = 8 + Filter Tamb = 25C
-30 -40 -50 -60 -70 -80 20
-30 -40 -50 -60 -70 -80 20
Vcc=5V, 3.6V, 2.5V
Vcc=5V, 3.6V, 2.5V
100
1000 Frequency (Hz)
10000 20k
100
1000 Frequency (Hz)
10000 20k
Figure 20. PSRR vs. common mode input voltage
0 -10 -20
PSRR(dB)
Figure 21. CMRR vs. frequency
0
Vripple = 200mVpp F = 217Hz, G = 6dB RL 4 + 15H Tamb = 25C
Vcc=2.5V
-20
CMRR (dB)
-30 -40 -50 -60 -70 Vcc=5V -80 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 Vcc=3.6V
RL=4 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C Vcc=5V, 3.6V, 2.5V
-40
-60
20
100
Common Mode Input Voltage (V)
1000 Frequency (Hz)
10000 20k
19/41
Electrical characteristic curves
TS4962M
Figure 22. CMRR vs. frequency
0 RL=4 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Figure 23. CMRR vs. frequency
0 RL=4 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
-20
CMRR (dB)
-20
CMRR (dB)
-40 Vcc=5V, 3.6V, 2.5V
-40 Vcc=5V, 3.6V, 2.5V
-60
-60
20
100
1000 Frequency (Hz)
10000 20k
20
100
1000 Frequency (Hz)
10000 20k
Figure 24. CMRR vs. frequency
0 RL=8 + 15H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
Figure 25. CMRR vs. frequency
0 RL=8 + 30H G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
-20
CMRR (dB)
-20
CMRR (dB)
-40 Vcc=5V, 3.6V, 2.5V
-40 Vcc=5V, 3.6V, 2.5V
-60
-60
20
100
1000 Frequency (Hz)
10000 20k
20
100
1000 Frequency (Hz)
10000 20k
Figure 26. CMRR vs. frequency
Figure 27. CMRR vs. common mode input voltage
-20
0 RL=8 + Filter G=6dB Vicm=200mVpp R/R0.1% Cin=4.7F Tamb = 25C
-30
CMRR(dB)
-20
CMRR (dB)
-40
Vicm = 200mVpp F = 217Hz G = 6dB RL 4 + 15H Tamb = 25C
Vcc=2.5V
-40 Vcc=5V, 3.6V, 2.5V
-50
Vcc=3.6V
-60
-60
-70 0.0
Vcc=5V
20
100
1000 Frequency (Hz)
10000 20k
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)
20/41
TS4962M
Electrical characteristic curves
Figure 28. THD+N vs. output power
10 RL = 4 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V
Figure 29. THD+N vs. output power
10 RL = 4 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
THD + N (%)
0.1
THD + N (%)
Vcc=2.5V
0.1
1E-3
0.01 0.1 Output Power (W)
1
3
1E-3
0.01 0.1 Output Power (W)
1
3
Figure 30. THD+N vs. output power
10 RL = 8 + 15H F = 100Hz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
Figure 31. THD+N vs. output power
10 RL = 8 + 30H or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
THD + N (%)
0.1
THD + N (%)
0.1
1E-3
0.01 0.1 Output Power (W)
1
2
1E-3
0.01 0.1 Output Power (W)
1
2
Figure 32. THD+N vs. output power
10 RL = 4 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
Figure 33. THD+N vs. output power
10 RL = 4 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
THD + N (%)
0.1 1E-3
THD + N (%)
0.01 0.1 Output Power (W)
1
3
0.1 1E-3
0.01 0.1 Output Power (W)
1
3
21/41
Electrical characteristic curves
TS4962M
Figure 34. THD+N vs. output power
10 RL = 8 + 15H F = 1kHz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
Figure 35. THD+N vs. output power
10 RL = 8 + 30H or Filter F = 1kHz G = 6dB BW < 30kHz Tamb = 25C 1
Vcc=5V Vcc=3.6V Vcc=2.5V
THD + N (%)
0.1 1E-3
THD + N (%)
0.01 0.1 Output Power (W)
1
2
0.1 1E-3
0.01 0.1 Output Power (W)
1
2
Figure 36. THD+N vs. frequency
10 RL=4 + 15H G=6dB Bw < 30kHz Vcc=5V Tamb = 25C 1
Figure 37. THD+N vs. frequency
10 RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25C 1
Po=1.5W
Po=1.5W
0.1
Po=0.75W
THD + N (%)
THD + N (%)
0.1
10000 20k
Po=0.75W
50
100
1000 Frequency (Hz)
50
100
1000 Frequency (Hz)
10000 20k
Figure 38. THD+N vs. frequency
10 RL=4 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C 1
Figure 39. THD+N vs. frequency
10 RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C 1
Po=0.9W
Po=0.9W
THD + N (%)
Po=0.45W
THD + N (%)
Po=0.45W
0.1
0.1
50
100
1000 Frequency (Hz)
10000 20k
50
100
1000 Frequency (Hz)
10000 20k
22/41
TS4962M
Electrical characteristic curves
Figure 40. THD+N vs. frequency
10 RL=4 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C 1
Figure 41. THD+N vs. frequency
10 RL=4 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C 1
Po=0.4W
Po=0.4W
Po=0.2W
THD + N (%)
THD + N (%)
Po=0.2W
0.1
0.1
200 1000 Frequency (Hz) 10000 20k
50
100
1000 Frequency (Hz)
10000 20k
Figure 42. THD+N vs. frequency
10 RL=8 + 15H G=6dB Bw < 30kHz Vcc=5V Tamb = 25C 1
Figure 43. THD+N vs. frequency
10 RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25C 1
THD + N (%)
THD + N (%)
Po=0.9W
Po=0.9W
0.1
Po=0.45W
0.1
Po=0.45W
50
100
1000 Frequency (Hz)
10000 20k
50
100
1000 Frequency (Hz)
10000 20k
Figure 44. THD+N vs. frequency
10 RL=8 + 15H G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C 1
Figure 45. THD+N vs. frequency
10 RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=3.6V Tamb = 25C 1
Po=0.5W
THD + N (%)
0.1
THD + N (%)
Po=0.5W
Po=0.25W
0.1
Po=0.25W
50
100
1000 Frequency (Hz)
10000 20k
50
100
1000 Frequency (Hz)
10000 20k
23/41
Electrical characteristic curves
TS4962M
Figure 46. THD+N vs. frequency
10 RL=8 + 15H G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C
Figure 47. THD+N vs. frequency
10 RL=8 + 30H or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25C
1
THD + N (%)
Po=0.2W
Po=0.2W
1
THD + N (%)
0.1
0.1
Po=0.1W
Po=0.1W
0.01
50
100
1000 Frequency (Hz)
10000 20k
0.01
50
100
1000 Frequency (Hz)
10000 20k
Figure 48. Gain vs. frequency
8
Figure 49. Gain vs. frequency
8
Differential Gain (dB)
4
Vcc=5V, 3.6V, 2.5V
Differential Gain (dB)
6
6
4
Vcc=5V, 3.6V, 2.5V
2
RL=4 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
2
RL=4 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
0
0
Figure 50. Gain vs. frequency
8
Figure 51. Gain vs. frequency
8
Differential Gain (dB)
Differential Gain (dB)
6
6 Vcc=5V, 3.6V, 2.5V 4 RL=8 + 15H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
4
Vcc=5V, 3.6V, 2.5V
2
RL=4 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
2
0
0
24/41
TS4962M
Electrical characteristic curves
Figure 52. Gain vs. frequency
8
Figure 53. Gain vs. frequency
8
Differential Gain (dB)
Vcc=5V, 3.6V, 2.5V 4 RL=8 + 30H G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
Differential Gain (dB)
6
6 Vcc=5V, 3.6V, 2.5V 4 RL=8 + Filter G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
2
2
0
0
Figure 54. Gain vs. frequency
Figure 55. Startup & shutdown time VCC = 5V, G = 6dB, Cin = 1F (5ms/div)
8
Vo1
Differential Gain (dB)
6 Vcc=5V, 3.6V, 2.5V 4 RL=No Load G=6dB Vin=500mVpp Cin=1F Tamb = 25C 20 100 1000 Frequency (Hz) 10000 20k
Vo2
Standby
Vo1-Vo2
2
0
25/41
Electrical characteristic curves
TS4962M
Figure 56. Startup & shutdown time VCC = 3V, G = 6dB, Cin = 1F (5ms/div)
Figure 57. Startup & shutdown time VCC = 5V, G = 6dB, Cin = 100nF (5ms/div)
V o1
Vo1
V o2
Vo2
Standby
Standby
Vo1-Vo2
Vo1-Vo2
Figure 58. Startup & shutdown time VCC = 3V, G = 6dB, Cin = 100nF (5ms/div)
Vo1
Figure 59. Startup & shutdown time VCC = 5V, G = 6dB, No Cin (5ms/div)
Vo1
Vo2
Vo 2
Standby
Standby
Vo1-Vo2
Vo1-Vo2
26/41
TS4962M Figure 60. Startup & shutdown time VCC = 3V, G = 6dB, No Cin (5ms/div)
Vo1
Electrical characteristic curves
Vo2
Standby
Vo1-Vo2
27/41
Application information
TS4962M
5
5.1
Application information
Differential configuration principle
The TS4962M is a monolithic fully-differential input/output class D power amplifier. The TS4962M 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 the device to always have a maximum output voltage swing, and by consequence, maximizes the output power. Moreover, as the load is connected differentially compared to a single-ended topology, the output is four times higher for the same power supply voltage. The advantages of a full-differential amplifier are:
High PSRR (power supply rejection ratio). High common mode noise rejection. Vir tually zero pop 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. As the differential function is directly linked to external resistor mismatching, paying particular attention to this mismatching is mandatory in order to obtain the best performance from the amplifier.
The main disadvantage is:
5.2
Gain in typical application schematic
Typical differential applications are shown in Figure 1 on page 4. In the flat region of the frequency-response curve (no input coupling capacitor effect), the differential gain is expressed by the relation:
AV
diff
300 -------t -- O u t = O-u-------------------- = --------+ Ri n In In
+
-
with Rin expressed in k. Due to the tolerance of the internal 150k feedback resistor, the differential gain will be in the range (no tolerance on Rin):
273 --------- A V 327 --------diff Ri n Ri n
28/41
TS4962M
Application information
5.3
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. However, due to Vicm limitation in the input stage (see Table 2: Operating conditions on page 3), the common mode feedback loop can ensure its role only within a defined range. This range depends upon the values of VCC and Rin (AVdiff). To have a good estimation of the Vicm value, we can apply this formula (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 150k resistor, it's also important to check Vicm in these conditions:
V C C × R i n + 2 × V I C × 163.5 k V C C × R i n + 2 × V I C × 136.5 k ---------------------------------------------------------------------------------- V i c m ---------------------------------------------------------------------------------2 × ( R i n + 136.5 k ) 2 × ( R i n + 163.5 k )
If the result of Vicm calculation is not in the previous range, input coupling capacitors must be used (with VCC from 2.4V to 2.5V, input coupling capacitors are mandatory).
For example:
With VCC = 3V, Rin = 150k and VIC = 2.5V, we typically find Vicm = 2V and this is lower than 3V - 0.8V = 2.2V. With 136.5k we find 1.97V, and with 163.5k we have 2.02V. So, no input coupling capacitors are required.
5.4
Low frequency response
If a low frequency bandwidth limitation is requested, 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 -3dB cut-off frequency:
1 F C L = ------------------------------------2 × Ri n × Ci n (Hz)
So, for a desired cut-off frequency we can calculate Cin,
1 C i n = --------------------------------------2 × Ri n × FC L (F)
with Rin in and FCL in Hz.
29/41
Application information
TS4962M
5.5
Decoupling of the circuit
A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962M. The TS4962M has a typical switching frequency at 250kHz and output fall and rise time about 5ns. Due to these very fast transients, careful decoupling is mandatory. A 1F ceramic capacitor is enough, but it must be located very close to the TS4962M in order to avoid any extra parasitic inductance created an overly 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 1F/6.3V capacitor used at 5V, loses about 50% of its value. In fact, with a 5V power supply voltage, the decoupling value is about 0.5F instead of 1F. As CS has 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 (6V).
5.6
Wake-up time (tWU)
When the standby is released to set the device ON, there is a wait of about 5ms. The TS4962M has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise.
5.7
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 shutdown mode, is about 5ms. This time is used to decrease the gain and avoid any pop noise during shutdown.
5.8
Consumption in shutdown mode
Between the shutdown pin and GND there is an internal 300k resistor. This resistor forces the TS4962M to be in standby mode when the standby input pin is left floating. However, this resistor also introduces additional power consumption if the shutdown pin voltage is not 0V. For example, with a 0.4V standby voltage pin, Table 2: Operating conditions on page 3, shows that you must add 0.4V/300k = 1.3A in typical (0.4V/273k= 1.46A in maximum) to the shutdown current specified in Table 4 on page 5.
5.9
Single-ended input configuration
It is possible to use the TS4962M in a single-ended input configuration. However, input coupling capacitors are needed in this configuration. The schematic in Figure 61 shows a single-ended input typical application.
30/41
TS4962M Figure 61. Single-ended input typical application
Vc c
Application information
B1 Ve
Standby
B2 Vcc
Cs 1u
C2 Stdby 300k
Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER 150k Oscillator GND TS4962 B3 A2
GND GND
Cin
GND
Rin
C1
A1 Rin Cin
GND
InIn+ +
-
A3 Out-
All formulas are identical except for the gain (with Rin in k) :
AV
sin g l e
Ve 300 = ------------------------------ = --------+ Ri n Out Out
And, due to the internal resistor tolerance we have:
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 TS4962M inputs (In- and In+) are equal. Figure 62. Typical application schematic with multiple single-ended inputs
Vcc Vek Cink GND Ve1 Cin1 Rin1 C1 Standby Rink C2 Stdby 300k Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER 150k Oscillator TS4962 GND A2 B3 GND A3 OutGND B1 Vcc B2 Cs 1u
A1 GND Ceq Req
InIn+ +
-
GND
31/41
Application information We have the following equations:
+ 300 300 O u t O u t = V e 1 × ------------ + ...+ V e k × -----------Ri n k Ri n 1 k (V)
TS4962M
Ce q =
j=1
Ci n j
C
inj
1 = -----------------------------------------------------2× × R × F inj CLj
(F)
1R e q = -----------------k
j =1
-- ---R-i--n j
1
In general, for mixed situations (single-ended and differential inputs), it is best to use the same rule, that is, to equalize impedance on both TS4962M inputs.
5.10
Output filter considerations
The TS4962M is designed to operate without an output filter. However, due to very sharp transients on the TS4962M output, EMI radiated emissions may cause some standard compliance issues. These EMI standard compliance issues can appear if the distance between the TS4962M outputs and loudspeaker terminal is long (typically more than 50mm, or 100mm in both directions, to the speaker terminals). As the PCB layout and internal equipment device are different for each configuration, it is difficult to provide a one-size-fits-all solution. However, to decrease the probability of EMI issues, there are several simple rules to follow:
Reduce, as much as possible, the distance between the TS4962M output pins and the speaker terminals. Use ground planes for "shielding" sensitive wires. Place, as close as possible to the TS4962M and in series with each output, a ferrite bead with a rated current at minimum 2A and impedance greater than 50 at frequencies above 30MHz. If, after testing, these ferrite beads are not necessary, replace them by a short-circuit. Murata BLM18EG221SN1 or BLM18EG121SN1 are possible examples of devices you can use. Allow enough footprint to place, if necessary, a capacitor to short perturbations to ground (see the schematics in Figure 63).
Figure 63. Method for shorting pertubations to ground
Fer rite chip bead Fro m TS4962 output ab o ut 100pF Gnd To speaker
32/41
TS4962M
Application information In the case where the distance between the TS4962M 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 250kHz. In this configuration, we recommend using an output filter (as shown in Figure 1: Typical application schematics on page 4). It should be placed as close as possible to the device.
5.11
Different examples with summed inputs
Example 1: Dual differential inputs
Figure 64. Typical application schematic with dual differential inputs
Vcc Standby C2 Stdby 300k R2 E2+ R1 E1+ E1R1 E2R2 150k Oscillator GND B3 A2 GND TS4962 OutC1 Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER A3 GND B1 Vcc B2 Cs 1u
A1
InIn+ +
-
With (Ri in k):
300 O ---t -- O u t A V = -----u-------------------- = --------1 + R1 E1 E1 300 Out Out A V = ------------------------------ = --------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
+ + + + -
33/41
Application information
TS4962M
Example 2: One differential input plus one single-ended input
Figure 65. Typical application schematic with one differential input plus one singleended input
Vcc Standby C2 Stdby 300k R2 E2+ C1 E1+ E2R2 150k GND C1 R1 Oscillator GND A2 B3 GND TS4962 OutR1 C1 Internal Bias 150k Out+ C3 Output PWM H Bridge SPEAKER A3 GND B1 Vcc B2 Cs 1u
A1
InIn+ +
-
With (Ri in k):
300 A V = O-u-------------------- = ---------------t -- O u t 1 + R1 E1 300 O ---t -- O u t A V = -----u-------------------- = --------2 + R2 E2 E2 1 C 1 = ------------------------------------2 × R1 × FC L (F)
+ + -
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TS4962M
Demoboard
6
Demoboard
A demoboard for the TS4962M is available with a flip-chip to DIP adapter. For more information about this demoboard, refer to Application Note AN2134. Figure 66. Schematic diagram of mono class D demoboard for TS4962M
Vcc Cn1 + J1 Cn2 Vcc
GND Cn4 + J2
GND
4 Stdby C2 Cn3 Positive Input Negative input 100nF 150k 100nF R 2 C3 150k 5 InIn+ 1 300k R1
Internal Bias 150k Out+ 6 Output PWM H Bridge 10 OutCn6 Positive Output Negative Output
+
150k Oscillator
Cn5 + J3
Figure 67. Diagram for flip-chip-to-DIP adapter
Pin3 pin8
OR
C1 100nF
B1 Vcc 300k Pin4 C2 Stdby Internal Bias 150k
B2
Out+ C3 Output PWM H Bridge Pin10 Pin6
Pin5 Pin1
C1
A1
InIn+ + 150k Oscillator
-
A3 Out-
GND A2 B3 R2 OR Pin2 Pin9
TS4962
+
+
GND
R1
1 2 3
C1 2.2uF/10V
Vcc 3 Vcc 8 U1
GND 2 GND 3
TS4962 Flip-Chip to DIP Adapter
C2 1uF
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Demoboard Figure 68. Top view
TS4962M
Figure 69. Bottom layer
Figure 70. Top layer
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TS4962M
Footprint recommendations
7
Footprint recommendations
Figure 71. Footprint recommendations
500m =250m 500m 75m min. 100m max. Track
500m
=400m typ. =340m min.
150m min.
Non Solder mask opening
500m
Pad Pad in Cu 18m with Flash NiAu (2-6m, 0.2m max.)
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Package information
TS4962M
8
Package information
In order to meet environmental requirements, STMicroelectronics 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 STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. Figure 72. Pin-out for 9-bump flip-chip (top view)
IN+ 1/A1 VDD 4/B1 IN7/C1 GND 2/A2 VDD 5/B2 STBY 8/C2 OUT3/A3 GND 6/B3 OUT+ 9/C3
Bumps are underneath Bump diameter = 300m
Figure 73. Marking for 9-bump flip-chip (top view) ST Logo
E
Symbol for lead-free: E Two first XX product code: 62 third X: Assembly code Three digits date code: Y for year - WW for week The dot is for marking pin A1
XXX YWW
Figure 74. Mechanical data for 9-bump flip-chip
1.60 mm
1.60 mm
Die size: 1.6mm x 1.6mm 30m Die height (including bumps): 600m Bump diameter: 315m 50m Bump diameter before reflow: 300m 10m Bump height: 250m 40m Die height: 350m 20m Pitch: 500m 50m Coplanarity: 50m max
0.5mm
0.5mm
0.25mm
600m
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TS4962M
Ordering information
9
Ordering information
Table 10. Order codes
Temperature range -40C to +85C Package Lead-free flip-chip Packing Tape & reel Marking 62
Part number TS4962MEIJT
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Revision history
TS4962M
10
Revision history
Date Oct. 2005 Nov. 2005 Dec. 2005 10-Jan-2007 Revision 1 2 3 4 Changes First release corresponding to the product preview version. Electrical data updated for output voltage noise, see Table 4, Table 5, Table 6, Table 7, Table 8 andTable 9 Formatting changes throughout. Product in full production. Template update, no technical changes.
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TS4962M
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