2.8 W filter-free mono class D audio power amplifier
Features
■ Operating from 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
■ Thermal shutdown protection
■ Available in DFN8 3 x 3 mm package
= 2.4 V to 5.5 V
CC
DFN8 3 x 3 mm
TS4962IQT pinout
1
1
2
2
EXPOSED
EXPOSED
PAD
3
3
4
4
PAD
TS4962
8
8
7
7
6
6
5
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 Doc ID 10968 Rev 8 1/44
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.
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 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 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 (t
4.7 Shutdown time (t
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
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
WU
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
STBY
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 Absolute maximum ratings and operating conditions
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
T
T
R
CC
V
oper
stg
T
thja
i
j
Supply voltage
Input voltage
Operating free air temperature range -40 to + 85 °C
Storage temperature -65 to +150 °C
Maximum junction temperature 150 °C
Thermal resistance junction to ambient
DFN8 package
Pd Power dissipation Internally limited
Human body model
ESD
Machine model
Charged device model
(1) (2)
(3)
(6)
(5)
(7)
6V
GND to V
CC
V
120 °C/W
(4)
2kV
200 V
Latch-up Latch-up immunity 200 mA
V
STBY
Standby pin maximum voltage
(8)
GND to V
CC
V
Lead temperature (soldering, 10sec) 260 °C
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 TS4962
Table 3. Operating conditions
Symbol Parameter Value Unit
V
V
R
CC
V
IC
STBY
R
L
thja
Supply voltage
Common mode input voltage range
Standby voltage input:
Device ON
Device OFF
Load resistor ≥ 4 Ω
Thermal resistance junction to ambient
DFN8 package
(1)
(5)
2.4 to 5.5 V
(2)
(3)
0.5 to VCC-0.8 V
1.4 ≤ V
GND
≤ V
STBY
STBY
≤ V
CC
≤ 0.4
(4)
50 °C/W
V
1. For VCC between 2.4 V and 2.5 V, the operating temperature range is reduced to 0°C ≤T
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 V
4. Minimum current consumption is obtained when V
5. When mounted on a 4-layer PCB.
, the device will be in standby.
STBY
STBY
= GND.
amb
≤ 70°C.
4/44 Doc ID 10968 Rev 8
TS4962 Application overview
2 Application overview
Table 4. External component information
Component Functional description
Bypass supply capacitor. Install as close as possible to the TS4962 to
C
S
R
in
Input capacitor
Table 5. Pin description
Pin number Pin name Description
1 STBY Standby input pin (active low)
2 NC No internal connection pin
3 IN+ Positive input pin
4 IN- Negative input pin
minimize high-frequency ripple. A 100 nF ceramic capacitor should be added
to enhance the power supply filtering at high frequencies.
Input resistor used to program the TS4962’s differential gain
(gain = 300 kΩ/R
with Rin in kΩ).
in
Because of common-mode feedback, these input capacitors are optional.
However, they can be added to form with R
-3 dB cut-off frequency = 1/(2*
π*R
in*Cin
a 1st order high-pass filter with
in
).
5 OUT+ Positive output pin
6 VCC Power supply input pin
7 GND Ground input pin
8 OUT- Negative output pin
Exposed pad
Exposed pad can be connected to ground (pin 7) or left
floating
Doc ID 10968 Rev 8 5/44
Application overview TS4962
Figure 1. Typical application schematics
Vcc
In+
GND
Differential
Input
In-
GND
In+
GND
Differential
Input
In-
GND
Vcc
GND
+
-
Input
capacitors
are optional
Rin
Rin
Vcc
GND
+
-
Input
capacitors
are optional
Stdby
1
4
InIn+
3
Rin
Rin
-
+
300k
150k
150k
1
4
3
Internal
Bias
Oscillator
Stdby
InIn+
PWM
-
+
300k
150k
150k
Internal
Bias
Oscillator
Vcc
Output
H
Bridge
GND
7
GND
6
PWM
Out+
Out-
6
Vcc
Out+
5
Output
H
Bridge
8
Out-
GND
7
GND
Vcc
Cs
1u
4 Ohms LC Output Filter
GND
5
8
15µH
30µH
15µH
GND
30µH
GND
GND
SPEAKER
2µF
2µF
1µF
1µF
Cs
1u
Load
6/44 Doc ID 10968 Rev 8
8 Ohms LC Output Filter
TS4962 Electrical characteristics
3 Electrical characteristics
Table 6. Electrical characteristics at VCC = +5 V,
with GND = 0 V, V
= 2.5 V, and T
icm
Symbol Parameter Min. Typ. Max. Unit
= 25°C (unless otherwise specified)
amb
I
CC
I
STBY
V
Supply current
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, R
(1)
STBY
L
= GND
= 8 Ω
2.3 3.3 mA
10 1000 nA
325mV
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, R
P
out
THD = 10% max, f = 1 kHz, R
THD = 1% max, f = 1 kHz, R
THD = 10% max, f = 1 kHz, R
= 4 Ω
L
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
2.2
2.8
1.4
1.7
W
Total harmonic distortion + noise
THD + N
= 850 mW
P
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
P
= 1 W
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
RMS
, G = 6 dB, 20 Hz < f < 20 kHz
RMS
, G = 6 dB, f = 1 kHz
2
0.4
%
Efficiency
Efficiency
PSRR
CMRR
Gain Gain value (Rin in kΩ)V/V
R
STBY
F
PWM
SNR
t
WU
t
STBY
P
= 2 W
out
P
=1.2 W
out
Power supply rejection ratio with inputs grounded
f = 217 Hz, RL = 8 Ω, G=6dB, V
, RL = 4 Ω + ≥ 15 µH
RMS
, RL = 8 Ω+ ≥ 15 µH
RMS
ripple
= 200 mV
(2)
pp
Common mode rejection ratio
f = 217 Hz, R
= 8 Ω, G = 6 dB, ΔVic = 200 mV
L
pp
273k
----------------R
Internal resistance from standby to GND 273 300 327 kΩ
Pulse width modulator base frequency 200 280 360 kHz
Signal to noise ratio (A weighting),
P
= 1.2 W, RL = 8 Ω
out
Wake-up time 5 10 ms
Standby time 5 10 ms
78
88
63 dB
57 dB
Ω
in
300k
----------------R
in
Ω
85 dB
327k
----------------R
in
%
Ω
Doc ID 10968 Rev 8 7/44
Electrical characteristics TS4962
Table 6. Electrical characteristics at VCC = +5 V,
with GND = 0 V, V
= 2.5 V, and T
icm
= 25°C (unless otherwise specified)
amb
(continued)
Symbol Parameter Min. Typ. Max. Unit
V
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
N
Unweighted RL = 4 Ω
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
1. Standby mode is active when V
2. Dynamic measurements - 20*log(rms(V
VCC at f = 217 Hz.
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
= 4 Ω + 15 µH
L
= 4 Ω + 15 µH
L
= 4 Ω + 30 µH
L
= 4 Ω + 30 µH
L
= 8 Ω + 30 µH
L
= 8 Ω + 30 µH
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
is tied to GND.
STBY
)/rms(V
out
ripple
)). V
85
60
86
62
83
60
88
64
78
57
87
65
82
59
is the superimposed sinusoidal signal to
ripple
μV
RMS
8/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Ω
Table 7. Electrical characteristics at VCC = +4.2 V with GND = 0 V, V
= 25°C (unless otherwise specified)
T
amb
(1)
Symbol Parameter Min. Typ. Max. Unit
= 2.1 V and
icm
I
CC
I
STBY
V
Supply current
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
(2)
STBY
= GND
2.1 3 mA
10 1000 nA
325mV
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
P
out
THD = 10% max, f = 1 kHz, R
THD = 1% max, f = 1 kHz, R
THD = 10% max, f = 1 kHz, R
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
1.5
1.95
0.9
1.1
W
Total harmonic distortion + noise
THD + N
= 600 mW
P
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
P
= 700 mW
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
, G = 6 dB, 20 Hz < f < 20 kHz
RMS
, G = 6 dB, f = 1 kHz
RMS
2
0.35
%
Efficiency
Efficiency
PSRR
CMRR
Gain Gain value (Rin in kΩ)V/V
P
out
P
out
= 1.45 W
= 0.9 W
, RL = 4 Ω + ≥ 15 µH
RMS
, RL = 8 Ω+ ≥ 15 µH
RMS
Power supply rejection ratio with inputs grounded
f = 217 Hz, RL = 8 Ω, G=6dB, V
ripple
= 200 mV
Common mode rejection ratio
f = 217 Hz, R
= 8 Ω, G = 6 dB, ΔVic = 200 mV
L
pp
(3)
pp
273k
----------------R
in
78
88
63
57 dB
300k
Ω
----------------R
in
327k
----------------R
in
%
dB
Ω
R
STBY
F
PWM
SNR
t
t
STBY
WU
Internal resistance from standby to GND 273 300 327 kΩ
Pulse width modulator base frequency 200 280 360 kHz
Signal to noise ratio (A-weighting)
P
= 0.8 W, RL = 8 Ω
out
85 dB
Wake-up time 5 10 ms
Standby time 5 10 ms
Doc ID 10968 Rev 8 9/44
Electrical characteristics TS4962
Table 7. Electrical characteristics at VCC = +4.2 V with GND = 0 V, V
= 25°C (unless otherwise specified)
T
amb
(1)
(continued)
= 2.1 V and
icm
Symbol Parameter Min. Typ. Max. Unit
V
1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V.
2. Standby mode is active when V
3. Dynamic measurements - 20*log(rms(V
VCC at f = 217 Hz.
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
N
Unweighted RL = 4 Ω
A-weighted R
= 4 Ω
L
Unweighted RL = 8 Ω
A-weighted R
= 8 Ω
L
Unweighted RL = 4 Ω + 15 µH
A-weighted R
= 4 Ω + 15 µH
L
Unweighted RL = 4 Ω + 30 µH
A-weighted R
= 4 Ω + 30 µH
L
Unweighted RL = 8 Ω + 30 µH
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
= 8 Ω + 30 µH
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
is tied to GND.
STBY
out
)/rms(V
ripple
)). V
85
60
86
62
83
60
88
64
78
57
87
65
82
59
is the superimposed sinusoidal signal to
ripple
μV
RMS
10/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Ω
Ω
Table 8. Electrical characteristics at VCC = +3.6 V
with GND = 0 V, V
= 1.8 V, T
icm
Symbol Parameter Min. Typ. Max. Unit
= 25°C (unless otherwise specified)
amb
(1)
I
I
STBY
V
Supply current
CC
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
(2)
STBY
= GND
22.8mA
10 1000 nA
325mV
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
P
out
THD = 10% max, f = 1 kHz, R
THD = 1% max, f = 1 kHz, R
THD = 10% max, f = 1 kHz, R
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
1.1
1.4
0.7
0.85
W
Total harmonic distortion + noise
THD + N
= 450 mW
P
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
P
= 500 mW
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
, G = 6 dB, 20 Hz < f < 20 kHz
RMS
, G = 6 dB, f = 1 kHz
RMS
2
0.1
%
Efficiency
Efficiency
PSRR
CMRR
Gain Gain value (Rin in kΩ)V/V
P
out
P
out
= 1 W
= 0.65 W
, RL = 4 Ω + ≥ 15 µH
RMS
, RL = 8 Ω+ ≥ 15 µH
RMS
Power supply rejection ratio with inputs grounded
f = 217 Hz, RL = 8 Ω, G=6dB, V
ripple
= 200 mV
Common mode rejection ratio
f = 217 Hz, R
= 8 Ω, G = 6 dB, ΔVic = 200 mV
L
pp
(3)
pp
273k
----------------R
78
88
62 dB
56 dB
300k
----------------R
in
in
327k
----------------R
in
%
Ω
R
STBY
F
PWM
SNR
t
t
STBY
Internal resistance from standby to GND 273 300 327 kΩ
Pulse width modulator base frequency 200 280 360 kHz
Signal to noise ratio (A-weighting)
P
= 0.6 W, RL = 8 Ω
out
Wake-up time 5 10 ms
WU
83 dB
Standby time 5 10 ms
Doc ID 10968 Rev 8 11/44
Electrical characteristics TS4962
Table 8. Electrical characteristics at VCC = +3.6 V
with GND = 0 V, V
= 1.8 V, T
icm
= 25°C (unless otherwise specified)
amb
(continued)
Symbol Parameter Min. Typ. Max. Unit
V
1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V.
2. Standby mode is activated when V
3. Dynamic measurements - 20*log(rms(V
VCC at f = 217 Hz.
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
N
Unweighted RL = 4 Ω
A-weighted R
= 4 Ω
L
Unweighted RL = 8 Ω
A-weighted R
= 8 Ω
L
Unweighted RL = 4 Ω + 15 µH
A-weighted R
= 4 Ω + 15 µH
L
Unweighted RL = 4 Ω + 30 µH
A-weighted R
= 4 Ω + 30 µH
L
Unweighted RL = 8 Ω + 30 µH
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
= 8 Ω + 30 µH
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
is tied to GND.
STBY
out
)/rms(V
ripple
)). V
83
57
83
61
81
58
87
62
77
56
85
63
80
57
is the superimposed sinusoidal signal to
ripple
μV
(1)
RMS
12/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Ω
Ω
Table 9. Electrical characteristics at VCC = +3.0 V
with GND = 0 V, V
= 1.5 V, T
icm
Symbol Parameter Min. Typ. Max. Unit
= 25°C (unless otherwise specified)
amb
(1)
I
I
STBY
V
Supply current
CC
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
(2)
STBY
= GND
1.9 2.7 mA
10 1000 nA
325mV
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
P
out
THD = 10% max, f = 1 kHz, R
THD = 1% max, f = 1 kHz, R
THD = 10% max, f = 1 kHz, R
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
0.7
1
0.5
0.6
W
Total harmonic distortion + noise
THD + N
= 300 mW
P
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
P
= 350 mW
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
, G = 6 dB, 20 Hz < f < 20 kHz
RMS
, G = 6 dB, f = 1 kHz
RMS
2
0.1
%
Efficiency
Efficiency
PSRR
CMRR
Gain Gain value (Rin in kΩ)V/V
P
out
P
out
= 0.7 W
= 0.45 W
, RL = 4 Ω + ≥ 15 µH
RMS
, RL = 8 Ω+ ≥ 15 µH
RMS
Power supply rejection ratio with inputs grounded
f = 217 Hz, RL = 8 Ω, G=6dB, V
ripple
= 200 mV
Common mode rejection ratio
f = 217 Hz, R
= 8 Ω, G = 6 dB, ΔVic=200mV
L
pp
78
%
88
(3)
pp
60
dB
54 dB
273k
----------------R
in
300k
-----------------
327k
Ω
-----------------
R
R
in
in
R
STBY
F
PWM
SNR
t
t
STBY
Internal resistance from standby to GND 273 300 327 kΩ
Pulse width modulator base frequency 200 280 360 kHz
Signal to noise ratio (A-weighting)
P
= 0.4 W, RL = 8 Ω
out
Wake-up time 5 10 ms
WU
82 dB
Standby time 5 10 ms
Doc ID 10968 Rev 8 13/44
Electrical characteristics TS4962
Table 9. Electrical characteristics at VCC = +3.0 V
with GND = 0 V, V
= 1.5 V, T
icm
= 25°C (unless otherwise specified)
amb
(continued)
Symbol Parameter Min. Typ. Max. Unit
V
1. All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V.
2. Standby mode is active when V
3. Dynamic measurements - 20*log(rms(V
VCC at f = 217 Hz.
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
N
Unweighted RL = 4 Ω
A-weighted R
= 4 Ω
L
Unweighted RL = 8 Ω
A-weighted R
= 8 Ω
L
Unweighted RL = 4 Ω + 15 µH
A-weighted R
= 4 Ω + 15 µH
L
Unweighted RL = 4 Ω + 30 µH
A-weighted R
= 4 Ω + 30 µH
L
Unweighted RL = 8 Ω + 30 µH
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
= 8 Ω + 30 µH
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
is tied to GND.
STBY
out
)/rms(V
ripple
)). V
83
57
83
61
81
58
87
62
77
56
85
63
80
57
is the superimposed sinusoidal signal to
ripple
μV
(1)
RMS
14/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Ω
Ω
Table 10. Electrical characteristics at VCC = +2.5 V
with GND = 0 V, V
= 1.25V, T
icm
Symbol Parameter Min. Typ. Max. Unit
= 25°C (unless otherwise specified)
amb
I
I
STBY
V
Supply current
CC
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
(1)
STBY
= GND
1.7 2.4 mA
10 1000 nA
325mV
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
P
out
THD = 10% max, f = 1 kHz, R
THD = 1% max, f = 1 kHz, R
THD = 10% max, f = 1 kHz, R
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
0.5
0.65
0.33
0.41
W
Total harmonic distortion + noise
THD + N
= 180 mW
P
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
P
= 200 mW
out
R
= 8 Ω + 15 µH, BW < 30 kHz
L
, G = 6 dB, 20 Hz < f < 20 kHz
RMS
, G = 6 dB, f = 1 kHz
RMS
1
0.05
%
Efficiency
Efficiency
PSRR
CMRR
Gain Gain value (Rin in kΩ)V/V
P
out
P
out
= 0.47 W
= 0.3 W
, RL = 4 Ω + ≥ 15 µH
RMS
, RL = 8 Ω+ ≥ 15 µH
RMS
Power supply rejection ratio with inputs grounded
f = 217 Hz, RL = 8 Ω, G = 6 dB, V
ripple
= 200 mV
Common mode rejection ratio
f = 217 Hz, R
= 8 Ω, G = 6 dB, ΔVic = 200 mV
L
pp
(2)
pp
273k
----------------R
78
88
60 dB
54 dB
300k
-----------------
in
327k
-----------------
R
R
in
in
%
Ω
R
STBY
F
PWM
SNR
t
t
STBY
Internal resistance from standby to GND 273 300 327 kΩ
Pulse width modulator base frequency 200 280 360 kHz
Signal to noise ratio (A-weighting)
P
= 0.3 W, RL = 8 Ω
out
Wake-up time 5 10 ms
WU
80 dB
Standby time 5 10 ms
Doc ID 10968 Rev 8 15/44
Electrical characteristics TS4962
Table 10. Electrical characteristics at VCC = +2.5 V
with GND = 0 V, V
= 1.25V, T
icm
= 25°C (unless otherwise specified)
amb
(continued)
Symbol Parameter Min. Typ. Max. Unit
V
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
N
Unweighted RL = 4 Ω
A-weighted R
= 4 Ω
L
Unweighted RL = 8 Ω
A-weighted R
= 8 Ω
L
Unweighted RL = 4 Ω + 15 µH
A-weighted R
= 4 Ω + 15 µH
L
Unweighted RL = 4 Ω + 30 µH
A-weighted R
= 4 Ω + 30 µH
L
Unweighted RL = 8 Ω + 30 µH
A-weighted R
Unweighted R
A-weighted R
Unweighted R
A-weighted R
1. Standby mode is active when V
2. Dynamic measurements - 20*log(rms(V
VCC at f = 217 Hz.
= 8 Ω + 30 µH
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
= 4 Ω + filter
L
is tied to GND.
STBY
)/rms(V
out
ripple
)). V
85
60
86
62
76
56
82
60
67
53
78
57
74
54
is the superimposed sinusoidal signal to
ripple
μV
RMS
16/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Ω
Ω
Table 11. Electrical characteristics at VCC +2.4 V
with GND = 0 V, V
= 1.2 V, T
icm
Symbol Parameter Min. Typ. Max. Unit
= 25°C (unless otherwise specified)
amb
I
CC
I
STBY
V
Supply current
No input signal, no load
Standby current
No input signal, V
Output offset voltage
oo
No input signal, RL = 8 Ω
(1)
STBY
= GND
1.7 mA
10 nA
3mV
Output power, G = 6 dB
THD = 1% max, f = 1 kHz, RL = 4 Ω
P
out
THD = 10% max, f = 1 kHz, R
THD = 1% max, f = 1 kHz, R
THD = 10% max, f = 1 kHz, R
= 4 Ω
L
= 8 Ω
L
= 8 Ω
L
0.42
0.61
0.3
0.38
W
Total harmonic distortion + noise
THD + N
P
= 150 mW
out
, G = 6 dB, 20 Hz < f < 20 kHz
RMS
1%
RL = 8 Ω + 15 µH, BW < 30 kHz
Efficiency
Efficiency
CMRR
Gain Gain value (Rin in kΩ)V/V
P
out
P
out
= 0.38 W
= 0.25 W
, RL = 4 Ω + ≥ 15 µH
RMS
, RL = 8 Ω+ ≥ 15 µH
RMS
Common mode rejection ratio
f = 217 Hz, R
= 8 Ω, G = 6 dB, ΔVic = 200 mV
L
pp
273k
----------------R
77
86
54 dB
300k
----------------R
in
in
327k
----------------R
in
%
Ω
R
STBY
F
PWM
SNR
t
WU
t
STBY
Internal resistance from standby to GND 273 300 327 kΩ
Pulse width modulator base frequency 280 kHz
Signal to noise ratio (A-weighting)
P
= 0.25 W, RL = 8 Ω
out
80 dB
Wake-up time 5 ms
Standby time 5 ms
Doc ID 10968 Rev 8 17/44
Electrical characteristics TS4962
Table 11. Electrical characteristics at VCC +2.4 V
with GND = 0 V, V
= 1.2 V, T
icm
= 25°C (unless otherwise specified)
amb
(continued)
Symbol Parameter Min. Typ. Max. Unit
V
Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB
N
Unweighted RL = 4 Ω
A-weighted RL = 4 Ω
Unweighted R
= 8 Ω
L
A-weighted RL = 8 Ω
Unweighted R
= 4 Ω + 15 µH
L
A-weighted RL = 4 Ω + 15 µH
Unweighted R
= 4 Ω + 30 µH
L
A-weighted RL = 4 Ω + 30 µH
Unweighted R
A-weighted R
Unweighted R
A-weighted R
= 8 Ω + 30 µH
L
= 8 Ω + 30 µH
L
= 4 Ω + filter
L
= 4 Ω + filter
L
Unweighted RL = 4 Ω + filter
A-weighted R
1. Standby mode is active when V
= 4 Ω + filter
L
is tied to GND.
STBY
85
60
86
62
76
56
82
60
67
53
78
57
74
54
μV
RMS
18/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
3.1 Electrical characteristics curves
The graphs shown in this section use the following abbreviations.
● R
● Filter = LC output filter (1 µF + 30 µH for 4 Ω and 0. 5µF + 60 µH for 8 Ω)
+ 15 μH or 30 μH = pure resistor + very low series resistance inductor
L
All measurements are done with C
PSRR where C
is removed (see Figure 3).
S1
= 1 µF and C
S1
= 100 nF (see Figure 2), except for the
S2
Figure 2. Schematic used for test measurements
1uF
Cs1
Rin
150k
Rin
150k
GND
Cin
Cin
Vcc
100nF
Cs2
+
GND
In+
In-
TS4962
GND
Out-
Out+
15uH or 30uH
or
LC Filter
Audio Measurement
Bandwidth < 30kHz
Figure 3. Schematic used for PSSR measurements
100nF
Cs2
20Hz to 20kHz
Vcc
4 or 8 Ohms
RL
5th order
50kHz low pass
filter
GND
4.7uF
4.7uF
50kHz low pass
Rin
150k
Rin
150k
5th order
filter
GND
In+
TS4962
In-
GND
Reference
GND
Out+
Out-
RMS Selective Measurement
15uH or 30uH
or
LC Filter
Bandwidth=1% of Fmeas
4 or 8 Ohms
RL
5th order
50kHz low pass
filter
Doc ID 10968 Rev 8 19/44
Electrical characteristics TS4962
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
0
2
4
6
8
10
Vcc=3.6V
Vcc=2.5V
Vcc=5V
G = 6dB
Tamb = 25°C
Voo (mV)
Common Mode Input Voltage (V)
Figure 4. Current consumption vs. power
supply voltage
2.5
No load
Tamb=25°C
2.0
1.5
1.0
0.5
Current Consumption (mA)
0.0
012345
Power Supply Voltage (V)
Figure 6. Current consumption vs. standby
voltage
2.0
1.5
Figure 5. Current consumption vs. standby
voltage
2.5
2.0
1.5
1.0
0.5
Current Consumption (mA)
0.0
012345
Standby Voltage (V)
Vcc = 5V
No load
Tamb=25°C
Figure 7. Output offset voltage vs. common
mode input voltage
1.0
0.5
Current Consumption (mA)
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Standby Voltage (V)
Vcc = 3V
No load
Tamb=25°C
Figure 8. Efficiency vs. output power Figure 9. Efficiency vs. output power
100
100
600
Efficiency
80
60
40
Efficiency (%)
20
Power
Dissipation
Vcc=5V
RL=4Ω + ≥ 15μH
F=1kHz
0
0.0 0.5 1.0 1.5 2.0
Output Power (W)
THD+N≤1%
2.2
500
400
300
200
100
0
Efficiency (%)
Power Dissipation (mW)
Efficiency
80
60
40
20
Power
Dissipation
Vcc=3V
RL=4Ω + ≥ 15μH
F=1kHz
0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Output Power (W)
THD+N≤1%
200
150
100
50
Power Dissipation (mW)
0
20/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
100 1000 10000
-80
-70
-60
-50
-40
-30
-20
-10
0
Vcc=5V, 3.6V, 2.5V
20k
20
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 4Ω + 30μH
Δ
R/R≤0.1%
Tamb = 25°C
PSRR (dB)
Frequency (Hz)
Figure 10. Efficiency vs. output power Figure 11. Efficiency vs. output power
100
80
Efficiency
60
40
Efficiency (%)
20
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Power
Dissipation
Output Power (W)
Vcc=5V
RL=8Ω + ≥ 15μH
F=1kHz
THD+N≤1%
Figure 12. Output power vs. power supply
voltage
3.5
RL = 4Ω + ≥ 15μH
F = 1kHz
3.0
BW < 30kHz
Tamb = 25°C
2.5
2.0
1.5
Output power (W)
1.0
0.5
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
THD+N=10%
THD+N=1%
Vcc (V)
150
100
50
Power Dissipation (mW)
0
100
80
60
40
Efficiency (%)
20
Efficiency
Power
Dissipation
0
0.0 0.1 0.2 0.3 0.4 0.5
Output Power (W)
Vcc=3V
RL=8Ω + ≥ 15μH
F=1kHz
THD+N≤1%
Figure 13. Output power vs. power supply
voltage
2.0
RL = 8Ω + ≥ 15μH
F = 1kHz
BW < 30kHz
Tamb = 25°C
1.5
THD+N=10%
1.0
Output power (W)
0.5
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
THD+N=1%
Vcc (V)
75
50
25
Power Dissipation (mW)
0
Figure 14. PSRR vs. frequency Figure 15. PSRR vs. frequency
0
Vripple = 200mVpp
-10
Inputs = Grounded
G = 6dB, Cin = 4.7μF
-20
RL = 4Ω + 15μH
Δ
R/R≤0.1%
-30
Tamb = 25°C
-40
PSRR (dB)
-50
-60
-70
-80
20
Vcc=5V, 3.6V, 2.5V
100 1000 10000
Frequency (Hz)
Doc ID 10968 Rev 8 21/44
20k
Electrical characteristics TS4962
100 1000 10000
-80
-70
-60
-50
-40
-30
-20
-10
0
Vcc=5V, 3.6V, 2.5V
20k
20
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 8Ω + 15μH
Δ
R/R≤0.1%
Tamb = 25°C
PSRR (dB)
Frequency (Hz)
100 1000 10000
-80
-70
-60
-50
-40
-30
-20
-10
0
Vcc=5V, 3.6V, 2.5V
20k
20
Vripple = 200mVpp
Inputs = Grounded
G = 6dB, Cin = 4.7μF
RL = 8Ω + Filter
Δ
R/R≤0.1%
Tamb = 25°C
PSRR (dB)
Frequency (Hz)
Figure 16. PSRR vs. frequency Figure 17. PSRR vs. frequency
0
Vripple = 200mVpp
-10
Inputs = Grounded
G = 6dB, Cin = 4.7μF
-20
RL = 4Ω + Filter
Δ
R/R≤0.1%
-30
Tamb = 25°C
-40
PSRR (dB)
-50
Vcc=5V, 3.6V, 2.5V
-60
-70
-80
20
100 1000 10000
Frequency (Hz)
20k
Figure 18. PSRR vs. frequency Figure 19. PSRR vs. frequency
0
Vripple = 200mVpp
-10
Inputs = Grounded
G = 6dB, Cin = 4.7μF
-20
RL = 8Ω + 30μH
Δ
R/R≤0.1%
-30
Tamb = 25°C
-40
PSRR (dB)
-50
-60
-70
-80
20
Vcc=5V, 3.6V, 2.5V
100 1000 10000
Frequency (Hz)
20k
Figure 20. PSRR vs. common mode input voltage Figure 21. CMRR vs. frequency
0
Vripple = 200mVpp
-10
F = 217Hz, G = 6dB
RL ≥ 4Ω + ≥ 15μH
-20
Tamb = 25°C
Vcc=2.5V
-30
-40
PSRR(dB)
-50
Vcc=3.6V
-60
-70
-80
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)
22/44 Doc ID 10968 Rev 8
Vcc=5V
0
-20
-40
CMRR (dB)
-60
RL=4Ω + 15μH
G=6dB
Δ
Vicm=200mVpp
Δ
R/R≤0.1%
Cin=4.7μF
Tamb = 25°C
100 1000 10000
Vcc=5V, 3.6V, 2.5V
Frequency (Hz)
20k20
TS4962 Electrical characteristics
Figure 22. CMRR vs. frequency Figure 23. CMRR vs. frequency
-20
-40
CMRR (dB)
-60
0
RL=4Ω + 30μH
G=6dB
Δ
Vicm=200mVpp
Δ
R/R≤0.1%
Cin=4.7μF
Tamb = 25°C
100 1000 10000
Vcc=5V, 3.6V, 2.5V
Frequency (Hz)
20k20
CMRR (dB)
0
-20
-40
-60
RL=4Ω + Filter
G=6dB
Δ
Vicm=200mVpp
Δ
R/R≤0.1%
Cin=4.7μF
Tamb = 25°C
100 1000 10000
Vcc=5V, 3.6V, 2.5V
Frequency (Hz)
Figure 24. CMRR vs. frequency Figure 25. CMRR vs. frequency
0
RL=8Ω + 15μH
G=6dB
Δ
-20
Δ
Cin=4.7μF
Tamb = 25°C
Vicm=200mVpp
R/R≤0.1%
Vcc=5V, 3.6V, 2.5V
0
RL=8Ω + 30μH
G=6dB
Δ
-20
Δ
Cin=4.7μF
Tamb = 25°C
Vicm=200mVpp
R/R≤0.1%
Vcc=5V, 3.6V, 2.5V
20k20
-40
CMRR (dB)
-60
100 1000 10000
Frequency (Hz)
20k20
-40
CMRR (dB)
-60
100 1000 10000
Frequency (Hz)
Figure 26. CMRR vs. frequency Figure 27. CMRR vs. common mode input
voltage
0
-20
-40
CMRR (dB)
-60
RL=8Ω + Filter
G=6dB
Δ
Vicm=200mVpp
Δ
R/R≤0.1%
Cin=4.7μF
Tamb = 25°C
100 1000 10000
Vcc=5V, 3.6V, 2.5V
Frequency (Hz)
20k20
-20
Δ
Vicm = 200mVpp
F = 217Hz
-30
G = 6dB
RL ≥ 4Ω + ≥ 15μH
Tamb = 25°C
-40
CMRR(dB)
-50
Vcc=2.5V
Vcc=3.6V
-60
Vcc=5V
-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)
20k20
Doc ID 10968 Rev 8 23/44
Electrical characteristics TS4962
1E-3 0.01 0.1 1
0.01
0.1
1
10
3
Vcc=3.6V
Vcc=5V
Vcc=2.5V
RL = 4Ω + 30μH or Filter
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
THD + N (%)
Output Power (W)
1E-3 0.01 0.1 1
0.01
0.1
1
10
2
Vcc=5V
Vcc=2.5V
Vcc=3.6V
RL = 8Ω + 30μH or Filter
F = 100Hz
G = 6dB
BW < 30kHz
Tamb = 25°C
THD + N (%)
Output Power (W)
Figure 28. THD+N vs. output power Figure 29. THD+N vs. output power
10
RL = 4Ω + 15μH
F = 100Hz
G = 6dB
BW < 30kHz
1
Tamb = 25°C
THD + N (%)
0.1
0.01
1E-3 0.01 0.1 1
Output Power (W)
Vcc=5V
Vcc=3.6V
Vcc=2.5V
3
Figure 30. THD+N vs. output power Figure 31. THD+N vs. output power
10
RL = 8Ω + 15μH
F = 100Hz
G = 6dB
BW < 30kHz
1
Tamb = 25°C
Vcc=5V
Vcc=3.6V
Vcc=2.5V
Figure 32. THD+N vs. output power Figure 33. THD+N vs. output power
THD + N (%)
0.1
0.01
1E-3 0.01 0.1 1
Output Power (W)
10
RL = 4Ω + 15μH
Vcc=5V
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
1
THD + N (%)
Vcc=3.6V
Vcc=2.5V
0.1
1E-3 0.01 0.1 1
Output Power (W)
2
10
RL = 4Ω + 30μH or Filter
Vcc=5V
F = 1kHz
1
THD + N (%)
G = 6dB
BW < 30kHz
Tamb = 25°C
Vcc=3.6V
Vcc=2.5V
0.1
3
1E-3 0.01 0.1 1
Output Power (W)
3
24/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Figure 34. THD+N vs. output power Figure 35. THD+N vs. output power
10
RL = 8Ω + 15μH
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
1
THD + N (%)
Vcc=5V
Vcc=3.6V
Vcc=2.5V
0.1
1E-3 0.01 0.1 1
Output Power (W)
2
10
RL = 8Ω + 30μH or Filter
F = 1kHz
G = 6dB
BW < 30kHz
Tamb = 25°C
1
THD + N (%)
Vcc=5V
Vcc=3.6V
Vcc=2.5V
0.1
1E-3 0.01 0.1 1
Output Power (W)
Figure 36. THD+N vs. frequency Figure 37. THD+N vs. frequency
10
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=5V
1
Tamb = 25°C
Po=1.4W
10
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=5V
1
Tamb = 25°C
Po=1.4W
2
THD + N (%)
0.01
0.1
Po=0.7W
100 1000 10000
Frequency (Hz)
20k50
THD + N (%)
0.1
0.01
Po=0.7W
100 1000 10000
Frequency (Hz)
Figure 38. THD+N vs. frequency Figure 39. THD+N vs. frequency
THD + N (%)
0.01
10
1
0.1
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=3.6V
Tamb = 25°C
Po=0.85W
Po=0.42W
100 1000 10000
Frequency (Hz)
20k50
10
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
1
Tamb = 25°C
THD + N (%)
0.1
0.01
100 1000 10000
Po=0.85W
Po=0.42W
Frequency (Hz)
20k50
20k50
Doc ID 10968 Rev 8 25/44
Electrical characteristics TS4962
Figure 40. THD+N vs. frequency Figure 41. THD+N vs. frequency
THD + N (%)
0.01
10
1
0.1
RL=4Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Po=0.35W
Po=0.17W
100 1000 10000
Frequency (Hz)
20k50
10
RL=4Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=2.5V
1
Tamb = 25°C
THD + N (%)
0.1
0.01
100 1000 10000
Po=0.35W
Po=0.17W
Frequency (Hz)
Figure 42. THD+N vs. frequency Figure 43. THD+N vs. frequency
10
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=5V
1
Tamb = 25°C
Po=0.85W
10
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=5V
1
Tamb = 25°C
Po=0.85W
20k50
THD + N (%)
0.01
0.1
Po=0.42W
100 1000 10000
Frequency (Hz)
20k50
THD + N (%)
0.1
0.01
Po=0.42W
100 1000 10000
Frequency (Hz)
Figure 44. THD+N vs. frequency Figure 45. THD+N vs. frequency
THD + N (%)
0.01
10
1
0.1
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=3.6V
Po=0.45W
Tamb = 25°C
Po=0.22W
100 1000 10000
Frequency (Hz)
20k50
10
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=3.6V
1
Tamb = 25°C
THD + N (%)
0.1
0.01
100 1000 10000
Po=0.45W
Frequency (Hz)
20k50
Po=0.22W
20k50
26/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
100 1000 10000
0
2
4
6
8
Vcc=5V, 3.6V, 2.5V
RL=4Ω + 30μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20k20
Differential Gain (dB)
Frequency (Hz)
100 1000 10000
0
2
4
6
8
Vcc=5V, 3.6V, 2.5V
RL=8Ω + 15μH
G=6dB
Vin=500mVpp
Cin=1μF
Tamb = 25°C
20k20
Differential Gain (dB)
Frequency (Hz)
Figure 46. THD+N vs. frequency Figure 47. THD+N vs. frequency
THD + N (%)
0.01
10
1
0.1
RL=8Ω + 15μH
G=6dB
Bw < 30kHz
Vcc=2.5V
Tamb = 25°C
Po=0.1W
Po=0.18W
100 1000 10000
Frequency (Hz)
20k50
10
RL=8Ω + 30μH or Filter
G=6dB
Bw < 30kHz
Vcc=2.5V
1
Tamb = 25°C
THD + N (%)
0.1
0.01
100 1000 10000
Po=0.18W
Po=0.1W
Frequency (Hz)
Figure 48. Gain vs. frequency Figure 49. Gain vs. frequency
8
6
4
Vcc=5V, 3.6V, 2.5V
20k50
RL=4Ω + 15μH
G=6dB
2
Differential Gain (dB)
Vin=500mVpp
Cin=1μF
Tamb = 25°C
0
100 1000 10000
20k20
Frequency (Hz)
Figure 50. Gain vs. frequency Figure 51. Gain vs. frequency
8
6
4
RL=4Ω + Filter
G=6dB
2
Differential Gain (dB)
Vin=500mVpp
Cin=1μF
Tamb = 25°C
0
Vcc=5V, 3.6V, 2.5V
100 1000 10000
Frequency (Hz)
20k20
Doc ID 10968 Rev 8 27/44
Electrical characteristics TS4962
Figure 52. Gain vs. frequency Figure 53. Gain vs. frequency
8
6
4
RL=8Ω + 30μH
G=6dB
2
Differential Gain (dB)
Vin=500mVpp
Cin=1μF
Tamb = 25°C
0
Vcc=5V, 3.6V, 2.5V
100 1000 10000
Frequency (Hz)
20k20
8
6
4
RL=8Ω + Filter
G=6dB
2
Differential Gain (dB)
Vin=500mVpp
Cin=1μF
Tamb = 25°C
0
Vcc=5V, 3.6V, 2.5V
100 1000 10000
Frequency (Hz)
Figure 54. Gain vs. frequency Figure 55. Startup and shutdown times
=5V, G=6dB, Cin= 1µF (5ms/div)
V
CC
8
6
Vcc=5V, 3.6V, 2.5V
4
Vo1
Vo2
Standby
20k20
RL=No Load
G=6dB
2
Differential Gain (dB)
Vin=500mVpp
Cin=1μF
Tamb = 25°C
0
100 1000 10000
Frequency (Hz)
Figure 56. Startup and shutdown times
= 3V, G = 6dB, Cin= 1µF (5ms/div)
V
CC
Vo1
Vo2
Standby
Vo1-Vo2
Vo1-Vo2
20k20
Figure 57. Startup and shutdown times
VCC= 5V, G = 6dB, Cin= 100nF (5ms/div)
Vo1
Vo2
Standby
Vo1-Vo2
28/44 Doc ID 10968 Rev 8
TS4962 Electrical characteristics
Figure 58. Startup and shutdown times
= 3V, G = 6dB, Cin= 100nF (5ms/div)
V
CC
Vo1
Vo2
Standby
Vo1-Vo2
Figure 60. Startup and shutdown times
in
Vo1
Vo2
= 3V, G = 6dB, No C
V
CC
(5ms/div)
Figure 59. Startup and shutdown times
VCC= 5V, G = 6dB, No C
Vo1
Vo2
Standby
Vo1-Vo2
(5ms/div)
in
Standby
Vo1-Vo2
Doc ID 10968 Rev 8 29/44
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 V
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.
/2 for any DC common-mode input voltage. This allows the device to
CC
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:
–
+In-
–
V
diff
-
327
--------- -
R
in
Out+Out
V
diff
------------------------------ -
In
with R
expressed in kΩ.
in
A
Due to the tolerance of the internal 150 kΩ feedback resistor, the differential gain is in the
range (no tolerance on R
):
in
273
--------- -
A
≤≤
R
in
300
--------- -==
R
in
30/44 Doc ID 10968 Rev 8
TS4962 Application information
4.3 Common-mode feedback loop limitations
As explained previously, the common-mode feedback loop allows the output DC bias
voltage to be averaged at V
However, due to a V
limitation in the input stage (see Table 3: Operating conditions on
icm
page 4), the common-mode feedback loop can play its role only within a defined range. This
range depends upon the values of V
value, we can apply this formula (no tolerance on Rin):
V
icm
with
And the result of the calculation must be in the range:
/2 for any DC common-mode bias input voltage.
CC
and Rin (A
CC
V
× 2V
CCRin
V
----------------------------------------------------------------------------- -
icm
2R
V
IC
× 150k Ω×+
in
In+In-+
---------------------
2
). To have a good estimation of the
Vdiff
IC
150k Ω+()×
(V)=
(V)=
0.5V V
Due to the +/-9% tolerance on the 150 kΩ resistor, it is also important to check V
conditions.
V
× 2V
CCRin
---------------------------------------------------------------------------------- -
2R
If the result of the V
must be used. With V
× 136.5k Ω×+
IC
136.5k Ω+()×
in
calculation is not in the previous range, input coupling capacitors
icm
between 2.4 and 2.5 V, input coupling capacitors are mandatory.
CC
For example:
With VCC=3V, R
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.
= 150 k and V
in
IC
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, C
with R
, a first order high-pass filter with a -3 dB cut-off frequency.
in
(input coupling capacitor) starts to have an effect. Cin forms,
in
F
CL
icm VCC
V
≤≤
icm
0.8V–≤≤
V
× 2V
CCRin
---------------------------------------------------------------------------------- -
2R
= 2.5 V, we typically find V
1
------------------------------------- -
× Cin×
2π R
(Hz)=
in
icm
× 163.5kΩ×+
IC
163.5k Ω+()×
in
= 2 V, which is lower than
icm
in these
So, for a desired cut-off frequency we can calculate C
1
--------------------------------------- -
C
with R
in Ω and FCL in Hz.
in
in
Doc ID 10968 Rev 8 31/44
× FCL×
2π R
in
,
in
(F)=
Application information TS4962
4.5 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 C
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).
has particular influence on the
S
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 (t
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.
STBY
)
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.
32/44 Doc ID 10968 Rev 8
TS4962 Application information
4.9 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
Ve
GND
GND
Cin
Cin
Standby
Rin
Rin
6
Stdby
InIn+
-
+
300k
150k
150k
Internal
Bias
Oscillator
PWM
1
4
3
Vcc
Output
H
Bridge
GND
7
GND
Out+
Out-
5
8
GND
SPEAKER
Cs
1u
All formulas are identical except for the gain with R
A
V
glesin
-------------------------------
Out+Out
in kΩ.
in
V
e
–
300
--------- -==
-
R
in
Due to the internal resistor tolerance we have:
273
--------- -
A
≤≤
R
in
327
--------- -
V
glesin
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
GND
Ve1
GND
GND
Standby
Cink
Cin1
Ceq
Rink
Rin1
Req
6
Stdby
InIn+
-
+
300k
150k
150k
Internal
Bias
Oscillator
PWM
1
4
3
Vcc
Output
H
Bridge
GND
7
GND
Out+
Out-
5
8
GND
SPEAKER
Cs
1u
Doc ID 10968 Rev 8 33/44
Application information TS4962
We have the following equations.
Out+Out
– V
-
300
-------------
×…V
e1
R
in1
C
=
eq
j1=
Σ
k
C
300
-------------
× (V)++=
ek
R
ink
in
i
C
------------------------------------------------------- ( F )=
in
i
2
R
eq
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).
π R
-------------------=
1
F×××
ini
CL
i
1
k
1
----------
∑
R
ini
j1=
Figure 63. Method for shorting perturbations to ground
Ferrite chip bead
From TS4962 output
34/44 Doc ID 10968 Rev 8
To speaker
about 100pF
Gnd
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
-
-
1
-
-
2
× R2×+×
IC
6
Vcc
Out+
Output
H
Bridge
Out-
GND
7
GND
300
--------- -==
R
1
300
--------- -==
R
2
+× R1×()×+×
1
E
------------------------=
2
Cs
1u
GND
5
SPEAKER
8
0.8V–≤≤
V
CC
+
-
E
+
2
2
2
With (R
in kΩ):
i
Standby
Stdby
1
R2
E2+
R1
E1+
E1-
E2-
V
CCR1
------------------------------------------------------------------------------------------------------------------------------- -
0.5V
4
3
R1
R2
× R2300 V
300 R
V
IC
1
Internal
Bias
300k
150k
-
InIn+
+
150k
A
V
1
A
V
2
1R2
+
E
+
1
------------------------= and V
2
PWM
Oscillator
Out+Out
–
------------------------------ -
+
E
–
E
1
Out+Out
–
------------------------------ -
+
E
–
E
2
IC1R2VIC2
+()2R
-
E
1
Doc ID 10968 Rev 8 35/44
Application information TS4962
4.11.2 Example 2: one differential input plus one single-ended input
Figure 65. Typical application schematic with one differential input and one
single-ended input
Standby
R2
E2+
R1
C1
E1+
E2-
R2
R1
C1
GND
6
Stdby
1
4
3
InIn+
300k
-
+
Internal
Bias
150k
150k
Oscillator
PWM
Vcc
Out+
Output
H
Bridge
Out-
GND
7
GND
5
8
Vcc
GND
SPEAKER
Cs
1u
With (R
in kΩ) :
i
A
V
1
A
V
2
C
1
Out+Out
------------------------------ -
Out+Out
------------------------------ -
E
2
--------------------------------------
× FCL×
2π R
-
–
+
E
1
-
–
+
-
E
–
2
1
1
300
--------- -==
R
1
300
--------- -==
R
2
(F)=
36/44 Doc ID 10968 Rev 8
TS4962 Demonstration board
5 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
Negative input
Positive Input
Cn1
Input
Cn4
1
2
3
Cn2
C1
100nF
1
2
GND
3
100nF
C2
Cn3
GND
R1
150k
R2
150k
Stdby
1
4
InIn+
3
-
+
300k
150k
150k
C3
1uF
Internal
Bias
Oscillator
GND
PWM
Vcc
Vcc
Output
H
Bridge
GND
7
GND
6
Out+
Out-
U1
5
8
TS4962DFN
Cn6
Gnd
Cn5
Positive Output
Negative Output
Speaker
Figure 67. Top view
Doc ID 10968 Rev 8 37/44
Demonstration board TS4962
Figure 68. Bottom layer
Figure 69. Top layer
38/44 Doc ID 10968 Rev 8
TS4962 Recommended footprint
6 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 39/44
Package information TS4962
7 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. 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.
Min. Typ. Max. Min. Typ. Max.
A 0.50 0.60 0.65 0.020 0.024 0.026
A1 0.02 0.05 0.0008 0.002
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 0.65 0.026
L 0.50 0.55 0.60 0.020 0.022 0.024
ddd 0.08 0.003
Millimeters Inches
Note: 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.
Doc ID 10968 Rev 8 41/44
Ordering information TS4962
8 Ordering information
Table 13. Order codes
Part number
TS4962IQT -40°C, +85°C DFN8 Tape & reel K962
Temperature
range
Package Packaging Marking
42/44 Doc ID 10968 Rev 8
TS4962 Revision history
9 Revision history
Table 14. Document revision history
Date Revision Changes
31-May-2006 5
16-Oct-2006 6
10-Jan-2007 7
18-Jan-2010 8 Added Table 5: Pin description.
Modified package information. Now includes only standard DFN8
package.
Added curves in Section 3: Electrical characteristics. Added
evaluation board information in Section 5: Demonstration board.
Added recommended footprint.
Added paragraph about rated voltage of capacitor in Section 4.5:
Decoupling of the circuit.
Doc ID 10968 Rev 8 43/44
TS4962
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44/44 Doc ID 10968 Rev 8
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