STMICROELECTRONICS TS4962_10

TS4962
2.8 W filter-free mono class D audio power amplifier
Features
DFN8 3 x 3 mm
■
Operating from VCC = 2.4 V to 5.5 V
■
Standby mode active low
■
Output power: 2.8 W into 4 Ω and 1.7 W into
8 Ω with 10% THD+N maximum and 5 V power
supply
■
Output power: 2.2 W at 5 V or 0.7 W at 3.0 V
into 4 Ω with 1% THD+N maximum
■
Output power: 1.4 W at 5 V or 0.5 W at 3.0 V
into 8 Ω 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: 280 kHz
■
Low pop & click noise
2
EXPOSED
7
■
Thermal shutdown protection
3
PAD
6
■
Available in DFN8 3 x 3 mm package
TS4962IQT pinout
8
1
4
5
Applications
■
Cellular phones
■
PDAs
■
Notebook PCs
Description
The TS4962 is a differential class-D BTL power
amplifier. It can drive up to 2.2 W into a 4 Ω load
and 1.4 W into an 8 Ω load at 5 V. It achieves
outstanding efficiency (88% typ.) compared to
standard AB-class audio amps.
January 2010
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 5 ms. A
standby function (active low) enables the current
consumption to be reduced to 10 nA typical.
Doc ID 10968 Rev 8
1/44
www.st.com
44
Contents
TS4962
Contents
1
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
2
Application overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1
4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.1
Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2
Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.3
Common-mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . 31
4.4
Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.5
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.6
Wake-up time (tWU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.7
Shutdown time (tSTBY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.8
Consumption in standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
4.9
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.10
Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.11
Several examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.11.1
Example 1: dual differential inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.11.2
Example 2: one differential input plus one single-ended input . . . . . . . . 36
5
Demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6
Recommended footprint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
2/44
Doc ID 10968 Rev 8
TS4962
1
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Table 1.
Absolute maximum ratings
Symbol
Parameter
Supply voltage(1) (2)
VCC
Vi
Input voltage
(3)
Value
Unit
6
V
GND to VCC
V
Toper
Operating free air temperature range
-40 to + 85
°C
Tstg
Storage temperature
-65 to +150
°C
Maximum junction temperature
150
°C
Thermal resistance junction to ambient
DFN8 package
120
°C/W
Tj
Rthja
Pd
Internally limited (4)
Power dissipation
Human body model(5)
Machine
ESD
model(6)
Charged device model
Latch-up
kV
200
V
200
mA
GND to VCC
V
260
°C
(7)
Latch-up immunity
Standby pin maximum voltage
VSTBY
2
(8)
Lead temperature (soldering, 10sec)
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 or 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 + 0.3 V/GND - 0.3 V.
4. Exceeding the power derating curves during a long period will provoke abnormal operation.
5. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ 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 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
7. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This is done for all pins.
8. The magnitude of the standby signal must never exceed VCC + 0.3 V/GND - 0.3 V.
Table 2.
Dissipation ratings
Package
Derating factor
Power rating at 25°C
Power rating at 85°C
DFN8
20 mW/°C
2.5 W
1.3 W
Doc ID 10968 Rev 8
3/44
Absolute maximum ratings and operating conditions
Table 3.
Operating conditions
Symbol
VCC
VIC
VSTBY
RL
Rthja
TS4962
Parameter
Supply voltage (1)
Common mode input voltage range
(2)
Standby voltage input: (3)
Device ON
Device OFF
Value
Unit
2.4 to 5.5
V
0.5 to VCC-0.8
V
1.4 ≤ VSTBY ≤ VCC
GND ≤ VSTBY ≤ 0.4 (4)
Load resistor
≥4
Ω
Thermal resistance junction to ambient
DFN8 package (5)
50
°C/W
1. For VCC between 2.4 V and 2.5 V, the operating temperature range is reduced to 0°C ≤Tamb
2. For VCC between 2.4V and 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.
4/44
V
When mounted on a 4-layer PCB.
Doc ID 10968 Rev 8
≤ 70°C.
TS4962
2
Application overview
Application overview
Table 4.
External component information
Component
Functional description
CS
Bypass supply capacitor. Install as close as possible to the TS4962 to
minimize high-frequency ripple. A 100 nF ceramic capacitor should be added
to enhance the power supply filtering at high frequencies.
Rin
Input resistor used to program the TS4962’s differential gain
(gain = 300 kΩ/Rin with Rin in kΩ).
Input capacitor
Table 5.
Because of common-mode feedback, these input capacitors are optional.
However, they can be added to form with Rin a 1st order high-pass filter with
-3 dB cut-off frequency = 1/(2*π*Rin*Cin).
Pin description
Pin number
Pin name
1
STBY
2
NC
No internal connection pin
3
IN+
Positive input pin
4
IN-
Negative input pin
5
OUT+
Positive output pin
6
VCC
Power supply input pin
7
GND
Ground input pin
8
OUT-
Negative output pin
Exposed pad
Description
Standby input pin (active low)
Exposed pad can be connected to ground (pin 7) or left
floating
Doc ID 10968 Rev 8
5/44
Application overview
Figure 1.
TS4962
Typical application schematics
Vcc
6
Vcc
Cs
1u
Vcc
In+
300k
1 Stdby
GND
Rin
GND
+
Differential
Input
4
InIn+
3
-
Rin
Input
capacitors
are optional
In-
Internal
Bias
Out+
150k
GND
5
Output
-
H
PWM
+
Bridge
SPEAKER
8
150k
Out-
Oscillator
GND
GND
7
GND
Vcc
6
Vcc
In+
300k
1 Stdby
GND
GND
+
Differential
Input
In-
-
Rin
4
3
Internal
Bias
4 Ohms LC Output Filter
GND
Out+
150k
5
15µH
Output
-
InIn+ +
PWM
2µF
H
GND
Bridge
Rin
Input
capacitors
are optional
GND
Cs
1u
Vcc
8
150k
Out-
2µF
15µH
Oscillator
GND
7
30µH
GND
1µF
GND
1µF
30µH
8 Ohms LC Output Filter
6/44
Doc ID 10968 Rev 8
Load
TS4962
3
Electrical characteristics
Electrical characteristics
Table 6.
Electrical characteristics at VCC = +5 V,
with GND = 0 V, Vicm = 2.5 V, and Tamb = 25°C (unless otherwise specified)
Symbol
Typ.
Max.
Unit
Supply current
No input signal, no load
2.3
3.3
mA
Standby current (1)
No input signal, VSTBY = GND
10
1000
nA
Voo
Output offset voltage
No input signal, RL = 8 Ω
3
25
mV
Pout
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
THD = 10% max, f = 1 kHz, RL = 4 Ω
THD = 1% max, f = 1 kHz, RL = 8 Ω
THD = 10% max, f = 1 kHz, RL = 8 Ω
ICC
ISTBY
Parameter
Min.
2.2
2.8
1.4
1.7
Total harmonic distortion + noise
Pout = 850 mWRMS, G = 6 dB, 20 Hz < f < 20 kHz
THD + N
RL = 8 Ω + 15 µH, BW < 30 kHz
Pout = 1 WRMS, G = 6 dB, f = 1 kHz
RL = 8 Ω + 15 µH, BW < 30 kHz
Efficiency
W
2
%
0.4
Efficiency
Pout = 2 WRMS, RL = 4 Ω + ≥ 15 µH
Pout = 1.2 WRMS, RL = 8 Ω+ ≥ 15 µH
78
88
%
PSRR
Power supply rejection ratio with inputs grounded (2)
f = 217 Hz, RL = 8 Ω, G = 6 dB, Vripple = 200 mVpp
63
dB
CMRR
Common mode rejection ratio
f = 217 Hz, RL = 8 Ω, G = 6 dB, ΔVic = 200 mVpp
57
dB
Gain
Gain value (Rin in kΩ)
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
RSTBY
Internal resistance from standby to GND
273
300
327
kΩ
FPWM
Pulse width modulator base frequency
200
280
360
kHz
SNR
Signal to noise ratio (A weighting),
Pout = 1.2 W, RL = 8 Ω
85
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
Doc ID 10968 Rev 8
dB
7/44
Electrical characteristics
Table 6.
TS4962
Electrical characteristics at VCC = +5 V,
with GND = 0 V, Vicm = 2.5 V, and Tamb = 25°C (unless otherwise specified)
(continued)
Symbol
Parameter
VN
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
Min.
Typ.
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
85
60
Unweighted RL = 8 Ω
A-weighted RL = 8 Ω
86
62
Unweighted RL = 4 Ω + 15 µH
A-weighted RL = 4 Ω + 15 µH
83
60
Unweighted RL = 4 Ω + 30 µH
A-weighted RL = 4 Ω + 30 µH
88
64
Unweighted RL = 8 Ω + 30 µH
A-weighted RL = 8 Ω + 30 µH
78
57
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
87
65
82
59
Max.
Unit
μVRMS
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.
8/44
Doc ID 10968 Rev 8
TS4962
Electrical characteristics
Table 7.
Electrical characteristics at VCC = +4.2 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 Ω
3
25
mV
Pout
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
THD = 10% max, f = 1 kHz, RL = 4 Ω
THD = 1% max, f = 1 kHz, RL = 8 Ω
THD = 10% max, f = 1 kHz, RL = 8 Ω
ICC
ISTBY
Parameter
Min.
1.5
1.95
0.9
1.1
Total harmonic distortion + noise
Pout = 600 mWRMS, G = 6 dB, 20 Hz < f < 20 kHz
THD + N
RL = 8 Ω + 15 µH, BW < 30 kHz
Pout = 700 mWRMS, G = 6 dB, f = 1 kHz
RL = 8 Ω + 15 µH, BW < 30 kHz
0.35
Efficiency
Pout = 1.45 WRMS, RL = 4 Ω + ≥ 15 µH
Pout = 0.9 WRMS, RL = 8 Ω+ ≥ 15 µH
78
88
PSRR
Power supply rejection ratio with inputs grounded (3)
f = 217 Hz, RL = 8 Ω, G = 6 dB, Vripple = 200 mVpp
63
CMRR
Common mode rejection ratio
f = 217 Hz, RL = 8 Ω, G = 6 dB, ΔVic = 200 mVpp
Efficiency
Gain
Gain value (Rin in kΩ)
W
2
%
%
dB
57
dB
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
RSTBY
Internal resistance from standby to GND
273
300
327
kΩ
FPWM
Pulse width modulator base frequency
200
280
360
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.8 W, RL = 8 Ω
85
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
Doc ID 10968 Rev 8
dB
9/44
Electrical characteristics
Table 7.
TS4962
Electrical characteristics at VCC = +4.2 V with GND = 0 V, Vicm = 2.1 V and
Tamb = 25°C (unless otherwise specified)(1) (continued)
Symbol
Parameter
VN
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
Min.
Typ.
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
85
60
Unweighted RL = 8 Ω
A-weighted RL = 8 Ω
86
62
Unweighted RL = 4 Ω + 15 µH
A-weighted RL = 4 Ω + 15 µH
83
60
Unweighted RL = 4 Ω + 30 µH
A-weighted RL = 4 Ω + 30 µH
88
64
Unweighted RL = 8 Ω + 30 µH
A-weighted RL = 8 Ω + 30 µH
78
57
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
87
65
82
59
Max.
Unit
μVRMS
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.
10/44
Doc ID 10968 Rev 8
TS4962
Electrical characteristics
Table 8.
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 Ω
3
25
mV
Pout
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
THD = 10% max, f = 1 kHz, RL = 4 Ω
THD = 1% max, f = 1 kHz, RL = 8 Ω
THD = 10% max, f = 1 kHz, RL = 8 Ω
ICC
ISTBY
Parameter
Min.
1.1
1.4
0.7
0.85
Total harmonic distortion + noise
Pout = 450 mWRMS, G = 6 dB, 20 Hz < f < 20 kHz
THD + N
RL = 8 Ω + 15 µH, BW < 30 kHz
Pout = 500 mWRMS, G = 6 dB, f = 1 kHz
RL = 8 Ω + 15 µH, BW < 30 kHz
Efficiency
W
2
%
0.1
Efficiency
Pout = 1 WRMS, RL = 4 Ω + ≥ 15 µH
Pout = 0.65 WRMS, RL = 8 Ω+ ≥ 15 µH
78
88
%
PSRR
Power supply rejection ratio with inputs grounded (3)
f = 217 Hz, RL = 8 Ω, G = 6 dB, Vripple = 200 mVpp
62
dB
CMRR
Common mode rejection ratio
f = 217 Hz, RL = 8 Ω, G = 6 dB, ΔVic = 200 mVpp
56
dB
Gain
Gain value (Rin in kΩ)
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
RSTBY
Internal resistance from standby to GND
273
300
327
kΩ
FPWM
Pulse width modulator base frequency
200
280
360
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.6 W, RL = 8 Ω
83
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
Doc ID 10968 Rev 8
dB
11/44
Electrical characteristics
Table 8.
Symbol
VN
TS4962
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 = 20 Hz to 20 kHz, G = 6 dB
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
83
57
Unweighted RL = 8 Ω
A-weighted RL = 8 Ω
83
61
Unweighted RL = 4 Ω + 15 µH
A-weighted RL = 4 Ω + 15 µH
81
58
Unweighted RL = 4 Ω + 30 µH
A-weighted RL = 4 Ω + 30 µH
87
62
Unweighted RL = 8 Ω + 30 µH
A-weighted RL = 8 Ω + 30 µH
77
56
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
85
63
80
57
μVRMS
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.
12/44
Doc ID 10968 Rev 8
TS4962
Electrical characteristics
Table 9.
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 Ω
3
25
mV
Pout
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
THD = 10% max, f = 1 kHz, RL = 4 Ω
THD = 1% max, f = 1 kHz, RL = 8 Ω
THD = 10% max, f = 1 kHz, RL = 8 Ω
ICC
ISTBY
Parameter
Min.
0.7
1
0.5
0.6
Total harmonic distortion + noise
Pout = 300 mWRMS, G = 6 dB, 20 Hz < f < 20 kHz
THD + N
RL = 8 Ω + 15 µH, BW < 30 kHz
Pout = 350 mWRMS, G = 6 dB, f = 1 kHz
RL = 8 Ω + 15 µH, BW < 30 kHz
0.1
Efficiency
Efficiency Pout = 0.7 WRMS, RL = 4 Ω + ≥ 15 µH
Pout = 0.45 WRMS, RL = 8 Ω+ ≥ 15 µH
78
88
PSRR
Power supply rejection ratio with inputs grounded (3)
f = 217 Hz, RL = 8 Ω, G = 6 dB, Vripple = 200 mVpp
CMRR
Common mode rejection ratio
f = 217 Hz, RL = 8 Ω, G = 6 dB, ΔVic = 200 mVpp
Gain
Gain value (Rin in kΩ)
W
2
%
%
dB
60
54
dB
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
RSTBY
Internal resistance from standby to GND
273
300
327
kΩ
FPWM
Pulse width modulator base frequency
200
280
360
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.4 W, RL = 8 Ω
82
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
Doc ID 10968 Rev 8
dB
13/44
Electrical characteristics
Table 9.
Symbol
VN
TS4962
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 = 20 Hz to 20 kHz, G = 6 dB
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
83
57
Unweighted RL = 8 Ω
A-weighted RL = 8 Ω
83
61
Unweighted RL = 4 Ω + 15 µH
A-weighted RL = 4 Ω + 15 µH
81
58
Unweighted RL = 4 Ω + 30 µH
A-weighted RL = 4 Ω + 30 µH
87
62
Unweighted RL = 8 Ω + 30 µH
A-weighted RL = 8 Ω + 30 µH
77
56
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
85
63
80
57
μVRMS
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.
14/44
Doc ID 10968 Rev 8
TS4962
Electrical characteristics
Table 10.
Electrical characteristics at VCC = +2.5 V
with GND = 0 V, Vicm = 1.25V, 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 Ω
3
25
mV
Pout
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
THD = 10% max, f = 1 kHz, RL = 4 Ω
THD = 1% max, f = 1 kHz, RL = 8 Ω
THD = 10% max, f = 1 kHz, RL = 8 Ω
ICC
ISTBY
Parameter
Min.
0.5
0.65
0.33
0.41
W
Total harmonic distortion + noise
Pout = 180 mWRMS, G = 6 dB, 20 Hz < f < 20 kHz
THD + N
RL = 8 Ω + 15 µH, BW < 30 kHz
Pout = 200 mWRMS, G = 6 dB, f = 1 kHz
RL = 8 Ω + 15 µH, BW < 30 kHz
0.05
Efficiency
Pout = 0.47 WRMS, RL = 4 Ω + ≥ 15 µH
Pout = 0.3 WRMS, RL = 8 Ω+ ≥ 15 µH
78
88
%
Efficiency
1
%
PSRR
Power supply rejection ratio with inputs grounded (2)
f = 217 Hz, RL = 8 Ω, G = 6 dB, Vripple = 200 mVpp
60
dB
CMRR
Common mode rejection ratio
f = 217 Hz, RL = 8 Ω, G = 6 dB, ΔVic = 200 mVpp
54
dB
Gain
Gain value (Rin in kΩ)
273k Ω
----------------R in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
RSTBY
Internal resistance from standby to GND
273
300
327
kΩ
FPWM
Pulse width modulator base frequency
200
280
360
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.3 W, RL = 8 Ω
80
tWU
Wake-up time
5
10
ms
tSTBY
Standby time
5
10
ms
Doc ID 10968 Rev 8
dB
15/44
Electrical characteristics
Table 10.
Symbol
VN
TS4962
Electrical characteristics at VCC = +2.5 V
with GND = 0 V, Vicm = 1.25V, Tamb = 25°C (unless otherwise specified)
(continued)
Parameter
Min.
Typ.
Max.
Unit
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
85
60
Unweighted RL = 8 Ω
A-weighted RL = 8 Ω
86
62
Unweighted RL = 4 Ω + 15 µH
A-weighted RL = 4 Ω + 15 µH
76
56
Unweighted RL = 4 Ω + 30 µH
A-weighted RL = 4 Ω + 30 µH
82
60
Unweighted RL = 8 Ω + 30 µH
A-weighted RL = 8 Ω + 30 µH
67
53
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
78
57
74
54
μVRMS
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.
16/44
Doc ID 10968 Rev 8
TS4962
Electrical characteristics
Table 11.
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 Ω
3
mV
Pout
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
THD = 10% max, f = 1 kHz, RL = 4 Ω
THD = 1% max, f = 1 kHz, RL = 8 Ω
THD = 10% max, f = 1 kHz, RL = 8 Ω
ICC
ISTBY
THD + N
Total harmonic distortion + noise
Pout = 150 mWRMS, G = 6 dB, 20 Hz < f < 20 kHz
RL = 8 Ω + 15 µH, BW < 30 kHz
Efficiency
Efficiency
Pout = 0.38 WRMS, RL = 4 Ω + ≥ 15 µH
Pout = 0.25 WRMS, RL = 8 Ω+ ≥ 15 µH
CMRR
Gain
0.42
0.61
0.3
0.38
Common mode rejection ratio
f = 217 Hz, RL = 8 Ω, G = 6 dB, ΔVic = 200 mVpp
Gain value (Rin in kΩ)
W
1
%
77
86
%
54
dB
273k Ω
----------------R
in
300k Ω
----------------R in
327k Ω
----------------R in
V/V
273
300
327
kΩ
RSTBY
Internal resistance from standby to GND
FPWM
Pulse width modulator base frequency
280
kHz
SNR
Signal to noise ratio (A-weighting)
Pout = 0.25 W, RL = 8 Ω
80
dB
tWU
Wake-up time
5
ms
tSTBY
Standby time
5
ms
Doc ID 10968 Rev 8
17/44
Electrical characteristics
Table 11.
TS4962
Electrical characteristics at VCC +2.4 V
with GND = 0 V, Vicm = 1.2 V, Tamb = 25°C (unless otherwise specified)
(continued)
Symbol
Parameter
VN
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
Typ.
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
85
60
Unweighted RL = 8 Ω
A-weighted RL = 8 Ω
86
62
Unweighted RL = 4 Ω + 15 µH
A-weighted RL = 4 Ω + 15 µH
76
56
Unweighted RL = 4 Ω + 30 µH
A-weighted RL = 4 Ω + 30 µH
82
60
Unweighted RL = 8 Ω + 30 µH
A-weighted RL = 8 Ω + 30 µH
67
53
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
Unweighted RL = 4 Ω + filter
A-weighted RL = 4 Ω + filter
78
57
74
54
1. Standby mode is active when VSTBY is tied to GND.
18/44
Min.
Doc ID 10968 Rev 8
Max.
Unit
μVRMS
TS4962
3.1
Electrical characteristics
Electrical characteristics curves
The graphs shown 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 Ω and 0. 5µF + 60 µH for 8 Ω)
All measurements are done with CS1 = 1 µF and CS2 = 100 nF (see Figure 2), except for the
PSRR where CS1 is removed (see Figure 3).
Figure 2.
Schematic used for test measurements
Vcc
1uF
100nF
Cs2
Cs1 +
Cin
GND
GND
Rin
Out+
In+
TS4962
Cin
Rin
4 or 8 Ohms
15uH or 30uH
150k
5th order
or
RL
filter
LC Filter
In-
50kHz low pass
Out-
150k
GND
Audio Measurement
Bandwidth < 30kHz
Figure 3.
Schematic used for PSSR measurements
100nF
Cs2
20Hz to 20kHz
Vcc
GND
4.7uF
GND
Rin
Out+
In+
15uH or 30uH
150k
TS4962
4.7uF
Rin
4 or 8 Ohms
or
5th order
RL
LC Filter
In-
50kHz low pass
filter
Out-
150k
GND
GND
5th order
50kHz low pass
Reference
RMS Selective Measurement
Bandwidth=1% of Fmeas
filter
Doc ID 10968 Rev 8
19/44
Electrical characteristics
TS4962
Current consumption vs. power
supply voltage
Figure 4.
Figure 5.
2.5
2.5
Current Consumption (mA)
Current Consumption (mA)
No load
Tamb=25°C
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
0
Current consumption vs. standby
voltage
1
2
3
4
5
Vcc = 5V
No load
Tamb=25°C
0
1
2
Figure 6.
Current consumption vs. standby
voltage
4
5
Output offset voltage vs. common
mode input voltage
Figure 7.
2.0
10
G = 6dB
Tamb = 25°C
8
1.5
Voo (mV)
Current Consumption (mA)
3
Standby Voltage (V)
Power Supply Voltage (V)
1.0
0.5
0.0
0.0
1.0
1.5
2.0
2.5
Vcc=5V
Vcc=3.6V
4
2
Vcc = 3V
No load
Tamb=25°C
0.5
6
Vcc=2.5V
0
0.0
3.0
0.5
1.0
Figure 8.
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Common Mode Input Voltage (V)
Standby Voltage (V)
Efficiency vs. output power
Efficiency vs. output power
Figure 9.
100
200
100
600
400
60
300
40
Power
Dissipation
20
0
0.0
20/44
0.5
200
Vcc=5V
RL=4Ω + ≥ 15μH
F=1kHz
THD+N≤1%
1.0
1.5
Output Power (W)
2.0
100
0
2.2
80
150
Efficiency (%)
500
60
100
40
Power
Dissipation
Vcc=3V
RL=4Ω + ≥ 15μH
F=1kHz
THD+N≤1%
20
0
0.0
Doc ID 10968 Rev 8
0.1
0.2
0.3
0.4
Output Power (W)
0.5
0.6
50
0
0.7
Power Dissipation (mW)
Efficiency
Efficiency
Power Dissipation (mW)
Efficiency (%)
80
TS4962
Electrical characteristics
Figure 10. Efficiency vs. output power
Figure 11. Efficiency vs. output power
75
100
100
100
60
40
Power
Dissipation
50
Vcc=5V
RL=8Ω + ≥ 15μH
F=1kHz
THD+N≤1%
20
0
0.0
0.2
0.4
0.6
0.8
Output Power (W)
1.0
80
Efficiency
0.2
0.3
Output Power (W)
0
0.5
0.4
RL = 8Ω + ≥ 15μH
F = 1kHz
BW < 30kHz
Tamb = 25°C
THD+N=10%
Output power (W)
Output power (W)
2.0
RL = 4Ω + ≥ 15μH
F = 1kHz
BW < 30kHz
Tamb = 25°C
0.1
25
Vcc=3V
RL=8Ω + ≥ 15μH
F=1kHz
THD+N≤1%
Figure 13. Output power vs. power supply
voltage
3.5
2.5
Power
Dissipation
0
0.0
Figure 12. Output power vs. power supply
voltage
3.0
40
20
0
1.4
1.2
50
60
Power Dissipation (mW)
Efficiency (%)
Efficiency
Efficiency (%)
80
Power Dissipation (mW)
150
2.0
1.5
THD+N=1%
1.0
1.5
THD+N=10%
1.0
0.5
THD+N=1%
0.5
0.0
0.0
2.5
3.0
3.5
4.0
Vcc (V)
4.5
5.0
5.5
Figure 14. PSRR vs. frequency
3.5
4.0
Vcc (V)
4.5
5.0
5.5
0
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 4Ω + 15μH
ΔR/R≤0.1%
Tamb = 25°C
-20
-30
-20
-40
Vcc=5V, 3.6V, 2.5V
-50
-30
-40
Vcc=5V, 3.6V, 2.5V
-50
-60
-60
-70
-70
20
100
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 4Ω + 30μH
ΔR/R≤0.1%
Tamb = 25°C
-10
PSRR (dB)
-10
PSRR (dB)
3.0
Figure 15. PSRR vs. frequency
0
-80
2.5
1000
Frequency (Hz)
10000 20k
-80
20
Doc ID 10968 Rev 8
100
1000
Frequency (Hz)
10000 20k
21/44
Electrical characteristics
TS4962
Figure 16. PSRR vs. frequency
Figure 17. PSRR vs. frequency
0
0
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 4Ω + Filter
ΔR/R≤0.1%
Tamb = 25°C
PSRR (dB)
-20
-30
-20
-40
Vcc=5V, 3.6V, 2.5V
-50
-40
Vcc=5V, 3.6V, 2.5V
-50
-60
-70
-70
20
100
1000
Frequency (Hz)
-80
10000 20k
Figure 18. PSRR vs. frequency
100
1000
Frequency (Hz)
10000 20k
0
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 8Ω + 30μH
ΔR/R≤0.1%
Tamb = 25°C
-20
-30
-20
-40
Vcc=5V, 3.6V, 2.5V
-50
-30
-40
Vcc=5V, 3.6V, 2.5V
-50
-60
-60
-70
-70
20
100
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 8Ω + Filter
ΔR/R≤0.1%
Tamb = 25°C
-10
PSRR (dB)
-10
-80
20
Figure 19. PSRR vs. frequency
0
PSRR (dB)
-30
-60
-80
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 8Ω + 15μH
ΔR/R≤0.1%
Tamb = 25°C
-10
PSRR (dB)
-10
1000
Frequency (Hz)
-80
10000 20k
20
100
1000
Frequency (Hz)
10000 20k
Figure 20. PSRR vs. common mode input voltage Figure 21. CMRR vs. frequency
0
-10
RL=4Ω + 15μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
Vcc=2.5V
-20
-30
CMRR (dB)
PSRR(dB)
-20
0
Vripple = 200mVpp
F = 217Hz, G = 6dB
RL ≥ 4Ω + ≥ 15μH
Tamb = 25°C
Vcc=3.6V
-40
-50
Vcc=5V, 3.6V, 2.5V
-40
-60
-60
-70
-80
0.0
Vcc=5V
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
20
Common Mode Input Voltage (V)
22/44
Doc ID 10968 Rev 8
100
1000
Frequency (Hz)
10000 20k
TS4962
Electrical characteristics
Figure 22. CMRR vs. frequency
Figure 23. CMRR vs. frequency
0
0
CMRR (dB)
-20
-20
Vcc=5V, 3.6V, 2.5V
-40
-60
100
20
1000
Frequency (Hz)
10000 20k
Figure 24. CMRR vs. frequency
10000 20k
0
RL=8Ω + 15μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
RL=8Ω + 30μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
-20
Vcc=5V, 3.6V, 2.5V
-40
-60
Vcc=5V, 3.6V, 2.5V
-40
-60
20
100
1000
Frequency (Hz)
10000 20k
Figure 26. CMRR vs. frequency
100
20
1000
Frequency (Hz)
10000 20k
Figure 27. CMRR vs. common mode input
voltage
-20
0
RL=8Ω + Filter
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
-30
CMRR(dB)
-20
1000
Frequency (Hz)
Figure 25. CMRR vs. frequency
CMRR (dB)
-20
100
20
0
CMRR (dB)
Vcc=5V, 3.6V, 2.5V
-40
-60
CMRR (dB)
RL=4Ω + Filter
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
CMRR (dB)
RL=4Ω + 30μH
G=6dB
ΔVicm=200mVpp
ΔR/R≤0.1%
Cin=4.7μF
Tamb = 25°C
Vcc=5V, 3.6V, 2.5V
-40
-40
ΔVicm = 200mVpp
F = 217Hz
G = 6dB
RL ≥ 4Ω + ≥ 15μH
Tamb = 25°C
Vcc=2.5V
-50
Vcc=3.6V
-60
-60
Vcc=5V
20
100
1000
Frequency (Hz)
10000 20k
-70
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)
Doc ID 10968 Rev 8
23/44
Electrical characteristics
TS4962
Figure 28. THD+N vs. output power
Figure 29. THD+N vs. output power
10
Vcc=2.5V
0.1
1
0.01
0.1
Output Power (W)
1
3
Figure 30. THD+N vs. output power
0.01
1E-3
Vcc=5V
Vcc=3.6V
Vcc=2.5V
1
THD + N (%)
THD + N (%)
0.01
0.1
Output Power (W)
1
3
RL = 8Ω + 30μH or Filter
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=5V
Vcc=3.6V
Vcc=2.5V
0.1
0.01
1E-3
0.01
0.1
Output Power (W)
1
2
Figure 32. THD+N vs. output power
0.01
1E-3
0.01
0.1
Output Power (W)
1
2
Figure 33. THD+N vs. output power
10
10
RL = 4Ω + 15μH
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=5V
Vcc=3.6V
THD + N (%)
THD + N (%)
Vcc=2.5V
10
RL = 8Ω + 15μH
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
0.1
Vcc=2.5V
0.1
1E-3
24/44
Vcc=3.6V
Figure 31. THD+N vs. output power
10
1
Vcc=5V
0.1
0.01
1E-3
1
RL = 4Ω + 30μH or Filter
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=3.6V
THD + N (%)
THD + N (%)
1
10
Vcc=5V
RL = 4Ω + 15μH
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
1
RL = 4Ω + 30μH or Filter
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=5V
Vcc=3.6V
Vcc=2.5V
0.1
0.01
0.1
Output Power (W)
1
3
1E-3
Doc ID 10968 Rev 8
0.01
0.1
Output Power (W)
1
3
TS4962
Electrical characteristics
Figure 34. THD+N vs. output power
Figure 35. THD+N vs. output power
1
10
RL = 8Ω + 15μH
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=3.6V
Vcc=2.5V
1E-3
0.01
0.1
Output Power (W)
1
1E-3
2
Figure 36. THD+N vs. frequency
0.01
0.1
Output Power (W)
1
THD + N (%)
Po=1.4W
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=5V
Tamb = 25°C
50
100
1000
Frequency (Hz)
10000 20k
0.01
Po=1.4W
100
50
1000
Frequency (Hz)
10000 20k
Figure 39. THD+N vs. frequency
10
10
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
1
Po=0.85W
THD + N (%)
THD + N (%)
2
Po=0.7W
Figure 38. THD+N vs. frequency
0.1
Po=0.85W
0.1
Po=0.42W
0.01
1
0.1
Po=0.7W
1
Vcc=2.5V
10
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=5V
Tamb = 25°C
0.1
0.01
Vcc=3.6V
Figure 37. THD+N vs. frequency
10
THD + N (%)
1
Vcc=5V
0.1
0.1
1
RL = 8Ω + 30μH or Filter
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=5V
THD + N (%)
THD + N (%)
10
50
100
1000
Frequency (Hz)
Po=0.42W
10000 20k
0.01
50
Doc ID 10968 Rev 8
100
1000
Frequency (Hz)
10000 20k
25/44
Electrical characteristics
TS4962
Figure 40. THD+N vs. frequency
Figure 41. THD+N vs. frequency
10
1
Po=0.35W
THD + N (%)
THD + N (%)
1
10
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
0.1
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Po=0.35W
0.1
Po=0.17W
0.01
50
100
1000
Frequency (Hz)
Po=0.17W
10000 20k
Figure 42. THD+N vs. frequency
0.01
1000
Frequency (Hz)
Po=0.85W
1
0.1
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=5V
Tamb = 25°C
50
100
1000
Frequency (Hz)
Po=0.42W
10000 20k
Figure 44. THD+N vs. frequency
0.01
100
1000
Frequency (Hz)
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Po=0.45W
1
0.1
Po=0.45W
0.1
Po=0.22W
0.01
26/44
10000 20k
10
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
THD + N (%)
THD + N (%)
50
Figure 45. THD+N vs. frequency
10
1
Po=0.85W
0.1
Po=0.42W
0.01
10000 20k
10
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=5V
Tamb = 25°C
THD + N (%)
THD + N (%)
100
Figure 43. THD+N vs. frequency
10
1
50
50
100
1000
Frequency (Hz)
Po=0.22W
10000 20k
0.01
50
Doc ID 10968 Rev 8
100
1000
Frequency (Hz)
10000 20k
TS4962
Electrical characteristics
Figure 46. THD+N vs. frequency
Figure 47. THD+N vs. frequency
10
10
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
1
Po=0.18W
THD + N (%)
THD + N (%)
1
Po=0.1W
0.1
0.01
50
100
1000
Frequency (Hz)
10000 20k
0.01
6
6
Vcc=5V, 3.6V, 2.5V
RL=4Ω + 15μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20
100
10000 20k
Figure 50. Gain vs. frequency
20
6
Differential Gain (dB)
6
0
Vcc=5V, 3.6V, 2.5V
RL=4Ω + Filter
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
100
1000
Frequency (Hz)
1000
Frequency (Hz)
10000 20k
Vcc=5V, 3.6V, 2.5V
4
10000 20k
RL=8Ω + 15μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
2
0
20
100
Figure 51. Gain vs. frequency
8
2
10000 20k
RL=4Ω + 30μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
2
8
4
1000
Frequency (Hz)
Vcc=5V, 3.6V, 2.5V
4
0
1000
Frequency (Hz)
100
50
Figure 49. Gain vs. frequency
8
0
Differential Gain (dB)
Po=0.1W
8
2
Po=0.18W
0.1
Differential Gain (dB)
Differential Gain (dB)
Figure 48. Gain vs. frequency
4
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
20
Doc ID 10968 Rev 8
100
1000
Frequency (Hz)
10000 20k
27/44
Electrical characteristics
TS4962
Figure 53. Gain vs. frequency
8
8
6
6
Differential Gain (dB)
Differential Gain (dB)
Figure 52. Gain vs. frequency
Vcc=5V, 3.6V, 2.5V
4
RL=8Ω + 30μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
2
0
Vcc=5V, 3.6V, 2.5V
4
0
20
100
1000
Frequency (Hz)
10000 20k
Figure 54. Gain vs. frequency
RL=8Ω + Filter
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
2
20
100
1000
Frequency (Hz)
10000 20k
Figure 55. Startup and shutdown times
VCC = 5V, G = 6dB, Cin= 1µF (5ms/div)
8
Differential Gain (dB)
Vo1
6
Vo2
Vcc=5V, 3.6V, 2.5V
4
Standby
RL=No Load
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
2
0
20
100
Vo1-Vo2
1000
Frequency (Hz)
10000 20k
Figure 57. Startup and shutdown times
Figure 56. Startup and shutdown times
VCC = 5V, G = 6dB, Cin= 100nF (5ms/div)
VCC = 3V, G = 6dB, Cin= 1µF (5ms/div)
Vo1
Vo1
Vo2
Vo2
Standby
Standby
Vo1-Vo2
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Vo1-Vo2
Doc ID 10968 Rev 8
TS4962
Electrical characteristics
Figure 59. Startup and shutdown times
Figure 58. Startup and shutdown times
VCC = 5V, G = 6dB, No Cin (5ms/div)
VCC = 3V, G = 6dB, Cin= 100nF (5ms/div)
Vo1
Vo1
Vo2
Vo2
Standby
Standby
Vo1-Vo2
Vo1-Vo2
Figure 60. Startup and shutdown times
VCC = 3V, G = 6dB, No Cin (5ms/div)
Vo1
Vo2
Standby
Vo1-Vo2
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Application information
TS4962
4
Application information
4.1
Differential configuration principle
The TS4962 is a monolithic, fully differential input/output class D power amplifier. The
TS4962 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, maximize 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 fully differential amplifier are:
●
high PSRR (power supply rejection ratio).
●
high common mode noise rejection.
●
virtually 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 because of common-mode feedback loop.
The main disadvantage is that, since the differential function is directly linked to the external
resistor mismatching, particular attention should be paid to this mismatching in order to
obtain the best performance from the amplifier.
4.2
Gain in typical application schematic
Typical differential applications are shown in Figure 1 on page 6.
In the flat region of the frequency-response curve (no input coupling capacitor effect), the
differential gain is expressed by the relation:
+
AV
diff
-
Out – Out- = 300
= --------------------------------------+
R in
In – In
with Rin expressed in kΩ.
Due to the tolerance of the internal 150 kΩ feedback resistor, the differential gain is in the
range (no tolerance on Rin):
273327
--------≤ A V ≤ ---------diff
R in
R in
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TS4962
4.3
Application information
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 a Vicm limitation in the input stage (see Table 3: Operating conditions on
page 4), the common-mode feedback loop can play 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 CC × R in + 2 × V IC × 150kΩ
V icm = -----------------------------------------------------------------------------2 × ( R in + 150kΩ)
(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 kΩ resistor, it is also important to check Vicm in these
conditions.
V CC × R in + 2 × V IC × 163.5kΩ
V CC × R in + 2 × V IC × 136.5kΩ
---------------------------------------------------------------------------------- ≤ V icm ≤ ---------------------------------------------------------------------------------2 × ( R in + 136.5kΩ)
2 × ( R in + 163.5kΩ)
If the result of the Vicm calculation is not in the previous range, input coupling capacitors
must be used. With VCC between 2.4 and 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, which is lower than
3 V-0.8 V = 2.2 V. With 136.5 kΩ we find 1.97 V and with 163.5 kΩ we have 2.02 V.
Therefore, no input coupling capacitors are required.
4.4
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 -3 dB cut-off frequency.
1
F CL = -------------------------------------2π × R in × C in
(Hz)
So, for a desired cut-off frequency we can calculate Cin,
1
C in = ---------------------------------------2π × R in × F CL
(F)
with Rin in Ω and FCL in Hz.
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Application information
4.5
TS4962
Decoupling of the circuit
A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962.
The TS4962 has a typical switching frequency at 250 kHz and output fall and rise time about
5 ns. Due to these very fast transients, careful decoupling is mandatory.
A 1 µF ceramic capacitor is enough, but it must be located very close to the TS4962 in order
to avoid any extra parasitic inductance being created by 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 Ω 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. 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 (6 V).
4.6
Wake-up time (tWU)
When the standby is released to set the device ON, there is a wait of about 5 ms. The
TS4962 has an internal digital delay that mutes the outputs and releases them after this
time in order to avoid any pop noise.
4.7
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 standby mode is about 5 ms. This time is used
to decrease the gain and avoid any pop noise during the shutdown phase.
4.8
Consumption in standby mode
Between the standby pin and GND there is an internal 300 kΩ resistor. This resistor forces
the TS4962 to be in standby mode when the standby input pin is left floating.
However, this resistor also introduces additional power consumption if the standby pin
voltage is not 0 V.
For example, with a 0.4 V standby voltage pin, Table 3 on page 4 shows that you must add
0.4 V/300 kΩ = 1.3 µA typical (0.4 V/273 kΩ = 1.46 µA maximum) to the standby current
specified in Table 5 on page 5.
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TS4962
Single-ended input configuration
It is possible to use the TS4962 in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. Figure 61 shows a typical single-ended
input application.
Figure 61. Single-ended input typical application
Vcc
6
Cs
1u
Vcc
Ve
1 Stdby
Cin
300k
Standby
Rin
GND
4
Internal
Bias
5
Output
-
3
GND
Out+
150k
InIn+ +
H
PWM
Bridge
SPEAKER
Rin
8
150k
Cin
Out-
Oscillator
GND
GND
7
GND
All formulas are identical except for the gain with Rin in kΩ.
AV
sin gle
Ve
300= ------------------------------ = --------+
R in
Out – Out
Due to the internal resistor tolerance we have:
327
273
---------- ≤ 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 TS4962 inputs (In- and In+) be equal.
Figure 62. Typical application schematic with multiple single-ended inputs
Vcc
Vek
Standby
Cink
6
Rink
1 Stdby
GND
Ve1
Cin1
Rin1
4
3
GND
Ceq
GND
Cs
1u
Vcc
300k
4.9
Application information
Internal
Bias
GND
Out+
150k
5
Output
-
InIn+ +
PWM
H
Bridge
SPEAKER
Req
8
150k
Out-
Oscillator
GND
7
GND
Doc ID 10968 Rev 8
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Application information
TS4962
We have the following equations.
+
300
300
Out – Out = V e1 × ------------- + …+ V ek × ------------R ink
R in1
(V)
k
C eq =
C
in i
Σ
j=1
C in i
1
= ------------------------------------------------------- (F)
2× π× R
× F
ini
CL i
1 R eq = -----------------k
1
∑ --------Rini
j =1
In general, for mixed situations (single-ended and differential inputs) it is best to use the
same rule, that is, equalize impedance on both TS4962 inputs.
4.10
Output filter considerations
The TS4962 is designed to operate without an output filter. However, due to very sharp
transients on the TS4962 output, EMI-radiated emissions may cause some standard
compliance issues.
These EMI standard compliance issues can appear if the distance between the TS4962
outputs and the loudspeaker terminal is long (typically more than 50 mm, or 100 mm 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 TS4962 output pins and the
speaker terminals.
●
Use ground planes for "shielding" sensitive wires.
●
Place, as close as possible to the TS4962 and in series with each output, a ferrite bead
with a rated current of at least 2.5 A and an impedance greater than 50 Ω 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 (see Figure 63).
Figure 63. Method for shorting perturbations to ground
Ferrite chip bead
To speaker
From TS4962 output
about 100pF
Gnd
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TS4962
Application information
In the case where the distance between the TS4962 output and the speaker terminals is
high, it is possible to observe low frequency EMI issues due to the fact that the typical
operating frequency is 250 kHz. In this configuration, we recommend using an output filter
(as represented in Figure 1 on page 6). It should be placed as close as possible to the
device.
4.11
Several examples with summed inputs
4.11.1
Example 1: dual differential inputs
Figure 64. Typical application schematic with dual differential inputs
Vcc
6
Standby
Cs
1u
Vcc
1 Stdby
300k
R2
E2+
R1
4
E1+
E1-
3
Internal
Bias
GND
Out+
150k
5
Output
-
InIn+ +
H
PWM
Bridge
SPEAKER
R1
8
150k
E2R2
Out-
Oscillator
GND
7
GND
With (Ri in kΩ):
+
-
+
-
Out – Out- = 300
A V = --------------------------------------1
+
R1
E1 – E1
300
Out – Out
A V = ------------------------------- = ---------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
and V IC = -----------------------V IC = -----------------------1
2
2
2
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Application information
4.11.2
TS4962
Example 2: one differential input plus one single-ended input
Figure 65. Typical application schematic with one differential input and one
single-ended input
Vcc
6
Standby
Cs
1u
Vcc
1 Stdby
300k
R2
E2+
C1
R1
E1+
E2-
4
3
Internal
Bias
Out+
150k
Output
-
InIn+ +
H
Bridge
PWM
SPEAKER
R2
8
150k
GND C1
R1
Out-
Oscillator
GND
7
GND
With (Ri in kΩ) :
+
-
+
-
Out – Out
300
A V = ------------------------------- = ---------1
+
R1
E1
300
Out – Out
A V = ------------------------------- = ---------2
+
R2
E2 – E2
1
C 1 = -------------------------------------2π × R 1 × F CL
36/44
GND
5
Doc ID 10968 Rev 8
(F)
TS4962
Demonstration board
A demonstration board for the TS4962 is available. For more information about this
demonstration board, refer to the application note AN2406 "TS4962IQ class D audio
amplifier evaluation board user guidelines" available on www.st.com.
Figure 66. Schematic diagram of mono class D demonstration board for the TS4962
DFN package
Vcc
Cn4
Vcc
1
2
3
Cn2
Cn6
C3
1uF
Gnd
6
GND
GND
U1
Vcc
1 Stdby
C1
100nF
Cn1
1
2
3
Negative input
Positive Input
Input
300k
5
Demonstration board
R1
4
InIn+
150k
GND
R2
100nF
C2
150k
3
Internal
Bias
Out+
150k
5
Cn5
Output
PWM
+
Positive Output
H
Negative Output
Bridge
Speaker
8
150k
Out-
Oscillator
GND
TS4962DFN
7
Cn3
GND
Figure 67. Top view
Doc ID 10968 Rev 8
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Demonstration board
TS4962
Figure 68. Bottom layer
Figure 69. Top layer
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Doc ID 10968 Rev 8
TS4962
6
Recommended footprint
Recommended footprint
Figure 70. Recommended footprint for TS4962 DFN package
1.8mm
0.8mm
0.35mm
2.2mm
0.65mm
1.4mm
Doc ID 10968 Rev 8
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Package information
7
TS4962
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
40/44
Doc ID 10968 Rev 8
TS4962
Package information
Figure 71. DFN8 3 x 3 exposed pad package mechanical drawing (pitch 0.65 mm)
Table 12.
DFN8 3 x 3 exposed pad package mechanical data (pitch 0.65 mm)
Dimensions
Ref.
A
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
0.50
0.60
0.65
0.020
0.024
0.026
0.02
0.05
0.0008
0.002
A1
A3
0.22
0.009
b
0.25
0.30
0.35
0.010
0.012
0.014
D
2.85
3.00
3.15
0.112
0.118
0.124
D2
1.60
1.70
1.80
0.063
0.067
0.071
E
2.85
3.00
3.15
0.112
0.118
0.124
E2
1.10
1.20
1.30
0.043
0.047
0.051
e
L
ddd
Note:
Inches
0.65
0.50
0.55
0.026
0.60
0.020
0.022
0.08
0.024
0.003
1
The pin 1 identifier must be visible on the top surface of the package by using an indentation
mark or other feature of the package body. Exact shape and size of this feature are optional.
2
The dimension L does not conform with JEDEC MO-248, which recommends
0.40+/-0.10 mm.
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 pin 7 or left
floating.
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Ordering information
8
TS4962
Ordering information
Table 13.
Order codes
Part number
TS4962IQT
42/44
Temperature
range
Package
Packaging
Marking
-40°C, +85°C
DFN8
Tape & reel
K962
Doc ID 10968 Rev 8
TS4962
9
Revision history
Revision history
Table 14.
Document revision history
Date
Revision
Changes
31-May-2006
5
Modified package information. Now includes only standard DFN8
package.
16-Oct-2006
6
Added curves in Section 3: Electrical characteristics. Added
evaluation board information in Section 5: Demonstration board.
Added recommended footprint.
10-Jan-2007
7
Added paragraph about rated voltage of capacitor in Section 4.5:
Decoupling of the circuit.
18-Jan-2010
8
Added Table 5: Pin description.
Doc ID 10968 Rev 8
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TS4962
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