ST TS4962M User Manual
3W filter-free class D audio power amplifier
Features
■ Operating from V
■ Standby mode active low
■ Output power: 3W into 4Ω and 1.75W into 8Ω
with 10% THD+N max and 5V power supply.
■ Output power: 2.3W @5V or 0.75W @ 3.0V
into 4Ω with 1% THD+N max.
■ Output power: 1.4W @5V or 0.45W @ 3.0V
into 8Ω with 1% THD+N max.
■ Adjustable gain via external resistors
■ Low current consumption 2mA @ 3V
■ Efficiency: 88% typ.
■ Signal to noise ratio: 85dB typ.
■ PSRR: 63dB typ. @217Hz with 6dB gain
■ PWM base frequency: 250kHz
■ Low pop & click noise
■ Thermal shutdown protection
■ Available in flip-chip 9 x 300μm (Pb-free)
Description
The TS4962M is a differential Class-D BTL po wer
amplifier. It is able to drive up to 2.3W into a 4Ω
load and 1.4W into a 8Ω load at 5V. It achieves
outstanding efficiency (88%typ.) compared to
classical Class-AB audio amps.
The gain of the device can be controlled via two
external gain-setting resistors. Pop & click
reduction circuitry provides low on/off s witch noise
while allowing the device to start within 5ms. A
standby function (active low) allows the reduction
of current consumption to 10nA typ.
= 2.4V to 5.5V
CC
Pin connections
IN
IN
+
+
1/A1
1/A1
V
V
DD
DD
4/B1
4/B1
IN
IN
-
-
7/C1 8/C2 9/C3
7/C1 8/C2 9/C3
IN+: positive differential input
IN-: negative differenti al input
VDD: analog power supply
GND: power supply ground
STBY: standb y pin (active low)
OUT+: positive differential output
OUT-: negative differential output
Block diagram
Stdby
C2
300k
150k
C1
-
InIn+
+
A1
150k
Applications
■ Cellular phone
■ PDA
■ Notebook PC
Internal
Bias
Oscillator
TS4962M
GND
GND
2/A2 3/A3
2/A2 3/A3
V
V
5/B2
5/B2
STBY
STBY
PWM
DD
DD
OUT
OUT
GND
GND
6/B3
6/B3
OUT
OUT
B1 B2
Vcc
Output
H
Bridge
GND
A2
-
-
+
+
Out+
Out-
C3
A3
B3
January 2007 Rev 4 1/41
www.st.com
41
Contents TS4962M
Contents
1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 29
For example: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6 Wake-up time: (t
5.7 Shutdown time (t
5.8 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.9 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.10 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.11 Different examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 1: Dual differential inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Example 2: One differential input plus one single-ended input . . . . . . . . . . . . . . . 34
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
WU
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
STBY
6 Demoboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
7 Footprint recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
9 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2/41
TS4962M Absolute maximum ratings
1 Absolute maximum ratings
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
T
T
R
P
CC
V
oper
stg
T
thja
diss
in
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
Power dissipation
ESD Human body model 2 kV
ESD Machine model 200 V
Latch-up Latch-up immunity 200 mA
V
STBY
Standby pin voltage maximum voltage
Lead temperature (soldering, 10sec) 260 °C
1. Caution: This device is not protected in the event of abnormal operating conditions, such as for example,
short-circuiting between any one output pin and ground, between any one output pin and VCC, and
between individual output pins.
2. All voltage values are measured with respect to the ground pin.
3. The magnitude of the input signal must never exceed VCC+ 0.3V / GND - 0.3V.
4. The device is protected in case of over temperature by a thermal shutdown active @ 150°C.
5. Exceeding the power derating curves during a long period causes abnormal operation.
6. The magnitude of the standby signal must never exceed VCC+ 0.3V / GND - 0.3V.
Table 2. Operating conditions
(1), (2)
(3)
(6)
(4)
6V
GND to V
CC
200 °C/W
Internally Limited
GND to V
CC
V
(5)
V
Symbol Parameter Value Unit
V
CC
V
IC
Supply voltage
Common mode input voltage range
Standby voltage input:
V
STBY
Device ON
Device OFF
R
L
R
thja
1. For VCC from 2.4V to 2.5V, the operating temperature range is reduced to 0°C ≤ T
2. For VCC from 2.4V to 2.5V, the common mode input range must be set at VCC/2.
3. Without any signal on V
4. Minimum current consumption is obtained when V
5. With heat sink surface = 125mm2.
Load resistor ≥ 4 Ω
Thermal resistance junction to ambient
(1)
(3)
, the device will be in standby.
STBY
STBY
(2)
= GND.
(5)
2.4 to 5.5 V
0.5 to V
1.4 ≤ V
GND
≤VSTBY
CC
STBY
- 0.8
≤ VCC
≤0.4
90 °C/W
amb
(4)
≤70°C.
3/41
V
V
Application component information TS4962M
2 Application component information
Table 3. Component information
Component Functional description
Bypass supply capacitor. Install as close as possible to the TS4962M to
C
s
R
in
Input
capacitor
Figure 1. Typical application schematics
In+
GND
Input
In-
GND
+
Input
capacitors
are optional
Differential
minimize high-frequency ripple. A 100nF ceramic capacitor should be
added to enhance the power supply filtering at high frequency.
Input resistor to program the TS4962M differential gain (gain = 300kΩ/Rin
with R
in kΩ).
in
Due to common mode feedback, these input capacitors are optional.
However, they can be added to form with R
-3dB cut-off frequency
Vcc
C2
GND
Rin
C1
A1
Rin
Stdby
InIn+
-
+
300k
150k
150k
Internal
Bias
Oscillator
= 1/(2*π*R
PWM
B1 B2
Vcc
Out+
Output
H
Bridge
Out-
GND
A2
GND
in*Cin
B3
a 1st order high pass filter with
in
).
Vcc
Cs
1u
GND
C3
SPEAKER
A3
TS4962
Vcc
In+
GND
Differential
Input
In-
GND
GND
+
Input
capacitors
are optional
Rin
Rin
C2
C1
A1
Stdby
InIn+
-
+
300k
150k
150k
Internal
Bias
Oscillator
4/41
PWM
B1 B2
Vcc
Out+
Output
H
Bridge
Out-
GND
A2
GND
B3
GND
C3
A3
TS4962
Vcc
Cs
1u
4 Ohms LC Output Filter
15µH
2µF
GND
2µF
15µH
30µH
1µF
GND
1µF
30µH
8 Ohms LC Output Filter
Load
TS4962M Electrical characteristics
Ω
3 Electrical characteristics
Table 4. VCC= +5V, GND = 0V, VIC=2.5V, t
= 25°C (unless otherwise specified)
amb
Symbol Parameter Conditions Min. Typ. Max. Unit
I
I
STBY
V
Supply current No input signal, no load 2.3 3.3 mA
CC
Standby current
Output offset voltage No input signal, RL=8Ω 325mV
OO
(1)
No input signal, V
= GND 10 1000 nA
STBY
G=6dB
2.3
3
1.4
1.75
1
0.4
78
88
63 dB
57 dB
300k
Ω
----------------R
in
in
327k
----------------R
in
Ω
P
THD + N
Output power
out
Total harmonic
distortion + noise
Efficiency Efficiency
Power supply
PSRR
CMRR
rejection ratio with
inputs grounded
(2)
Common mode
rejection ratio
Gain Gain value R
R
STBY
Internal resistance
from Standby to GND
THD = 1% max, F = 1kHz, R
L
=4Ω
THD = 10% max, F = 1kHz, RL=4Ω
THD = 1% max, F = 1kHz, R
L
=8Ω
THD = 10% max, F = 1kHz, RL=8Ω
P
= 900mW
out
=8Ω + 15µH, BW < 30kHz
R
L
P
=1W
out
R
L
P
out
P
out
RMS
=8Ω + 15µH, BW < 30kHz
=2W
RMS
=1.2W
, G = 6dB, 20Hz < F < 20kHz
RMS
, G = 6dB, F = 1kHz,
, RL=4Ω + ≥ 15µH
, RL=8Ω+ ≥ 15µH
RMS
F = 217Hz, RL=8Ω, G=6dB,
= 200mV
V
ripple
F = 217Hz, R
ΔV
= 200mV
icm
in kΩ V/V
in
pp
=8Ω, G = 6dB,
L
pp
273k
----------------R
273 300 327 kΩ
W
%
%
PWM
base frequency
Pulse width modulator
F
SNR Signal to noise ratio A-weighting, P
t
WU
t
STBY
Wake-up time 5 10 ms
Standby time 5 10 ms
180 250 320 kHz
= 1.2W, RL=8Ω 85 dB
out
5/41
Electrical characteristics TS4962M
Table 4. VCC= +5V, GND = 0V, VIC=2.5V, t
= 25°C (unless otherwise specified) (continued)
amb
Symbol Parameter Conditions Min. Typ. Max. Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL=4Ω
A-weighted RL=4Ω
Unweighted RL=8Ω
A-weighted RL=8Ω
Unweighted R
A-weighted R
V
Output voltage noise
N
Unweighted R
A-weighted RL=4Ω + 30µH
Unweighted R
A-weighted RL=8Ω + 30µH
Unweighted R
A-weighted R
Unweighted R
A-weighted R
1. Standby mode is active when V
2. Dynamic measurements - 20*log(rms(V
is tied to GND.
STBY
)/rms(V
out
=4Ω + 15µH
L
=4Ω + 15µH
L
=4Ω + 30µH
L
=8Ω + 30µH
L
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
)). V
ripple
ripple
is the superimposed sinusoidal signal to VCC @ F = 217Hz.
85
60
86
62
83
60
88
64
78
57
87
65
82
59
μV
RMS
6/41
TS4962M Electrical characteristics
Ω
Table 5. VCC= +4.2V, GND = 0V, VIC=2.5V, T
= 25°C (unless otherwise specified)
amb
(1)
Symbol Parameter Conditions Min. T yp. Max. Unit
I
I
STBY
V
Supply current No input signal, no load 2.1 3 mA
CC
Standby current
Output offset voltage No input signal, RL=8Ω 325mV
OO
(2)
No input signal, V
= GND 10 1000 nA
STBY
G=6dB
1.6
2
0.95
1.2
1
0.35
78
88
63 dB
57 dB
300k
Ω
----------------R
in
in
327k
----------------R
in
Ω
P
THD + N
Output power
out
Total harmonic
distortion + noise
Efficiency Efficiency
Power supply
PSRR
CMRR
rejection ratio with
inputs grounded
(3)
Common mode
rejection ratio
Gain Gain value R
R
F
STBY
PWM
Internal resistance
from Standby to GND
Pulse width modulator
base frequency
THD = 1% max, F = 1kHz, R
THD = 10% max, F = 1kHz, R
L
=4Ω
=4Ω
L
THD = 1% max, F = 1kHz, RL=8Ω
THD = 10% max, F = 1kHz, RL=8Ω
P
out
= 600mW
, G = 6dB, 20Hz < F < 20kHz
RMS
RL=8Ω + 15µH, BW < 30kHz
P
= 700mW
out
=8Ω + 15µH, BW < 30kHz
R
L
=1.45W
P
out
=0.9W
P
out
, G = 6dB, F = 1kHz,
RMS
, RL=4Ω + ≥ 15µH
RMS
, RL=8Ω+ ≥ 15µH
RMS
F = 217Hz, RL=8Ω, G=6dB,
V
= 200mV
ripple
F = 217Hz, R
ΔV
=200mV
icm
in kΩ V/V
in
pp
=8Ω, G=6dB,
L
pp
273k
----------------R
273 300 327 kΩ
180 250 320 kHz
W
%
%
SNR Signal to noise ratio A-weighting, P
t
WU
t
STBY
Wake-uptime 5 10 ms
Standby time 5 10 ms
= 0.9W, RL=8Ω 85 dB
out
7/41
Electrical characteristics TS4962M
Table 5. VCC= +4.2V, GND = 0V, VIC=2.5V, T
= 25°C (unless otherwise specified)
amb
(1)
Symbol Parameter Conditions Min. T yp. Max. Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL=4Ω
A-weighted RL=4Ω
Unweighted RL=8Ω
A-weighted RL=8Ω
Unweighted R
A-weighted R
V
Output voltage noise
N
Unweighted R
=4Ω + 15µH
L
=4Ω + 15µH
L
=4Ω + 30µH
L
A-weighted RL=4Ω + 30µH
Unweighted R
=8Ω + 30µH
L
A-weighted RL=8Ω + 30µH
Unweighted R
A-weighted R
Unweighted R
A-weighted R
1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V.
2. Standby mode is active when V
3. Dynamic measurements - 20*log(rms(V
is tied to GND.
STBY
out
)/rms(V
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
)). V
ripple
is the superimposed sinusoidal signal to VCC @ F = 217Hz.
ripple
85
60
86
62
83
60
88
64
78
57
87
65
82
59
μV
RMS
8/41
TS4962M Electrical characteristics
Ω
Table 6. VCC= +3.6V, GND = 0V, VIC= 2.5V, T
= 25°C (unless otherwise specified)
amb
(1)
Symbol Parameter Conditions Min. Typ. Max. Unit
I
I
STBY
V
Supply current No input signal, no load 2 2.8 mA
CC
Standby current
Output offset voltage No input signal, RL=8Ω 325mV
OO
(2)
No input signal, V
= GND 10 1000 nA
STBY
G=6dB
1.15
1.51
0.7
0.9
1
0.27
78
88
62 dB
56 dB
300k
Ω
----------------R
in
in
327k
----------------R
in
Ω
P
THD + N
Output power
out
Total harmonic
distortion + noise
Efficiency Efficiency
Power supply
PSRR
CMRR
rejection ratio with
inputs grounded
(3)
Common mode
rejection ratio
Gain Gain value R
R
F
STBY
PWM
Internal resistance
from Standby to GND
Pulse width modulator
base frequency
THD = 1% max, F = 1kHz, R
THD = 10% max, F = 1kHz, R
=4Ω
L
L
=4Ω
THD = 1% max, F = 1kHz, RL=8Ω
THD = 10% max, F = 1kHz, RL=8Ω
P
out
= 500mW
, G = 6dB, 20Hz < F< 20kHz
RMS
RL=8Ω + 15µH, BW < 30kHz
P
= 500mW
out
=8Ω + 15µH, BW < 30kHz
R
L
=1W
P
out
P
out
RMS
=0.65W
, G = 6dB, F = 1kHz,
RMS
, RL=4Ω + ≥ 15µH
, RL=8Ω+ ≥ 15µH
RMS
F = 217Hz, RL=8Ω, G=6dB,
V
= 200mV
ripple
F = 217Hz, R
ΔV
= 200mV
icm
in kΩ V/V
in
pp
=8Ω, G=6dB,
L
pp
273k
----------------R
273 300 327 kΩ
180 250 320 kHz
W
%
%
SNR Signal to noise ratio A-weighting, P
t
WU
t
STBY
Wake-uptime 5 10 ms
Standby time 5 10 ms
= 0.6W, RL=8Ω 83 dB
out
9/41
Electrical characteristics TS4962M
Table 6. VCC= +3.6V, GND = 0V, VIC= 2.5V, T
= 25°C (unless otherwise specified)
amb
(1)
Symbol Parameter Conditions Min. Typ. Max. Unit
F = 20Hz to 20kHz, G = 6dB
Unweighted RL=4Ω
A-weighted RL=4Ω
Unweighted RL=8Ω
A-weighted RL=8Ω
Unweighted R
A-weighted R
V
Output voltage noise
N
Unweighted R
=4Ω + 15µH
L
=4Ω + 15µH
L
=4Ω + 30µH
L
A-weighted RL=4Ω + 30µH
Unweighted R
=8Ω + 30µH
L
A-weighted RL=8Ω + 30µH
Unweighted R
A-weighted R
Unweighted R
A-weighted R
1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V.
2. Standby mode is active when V
3. Dynamic measurements - 20*log(rms(V
is tied to GND.
STBY
out
)/rms(V
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
)). V
ripple
is the superimposed sinusoidal signal to VCC @ F = 217Hz.
ripple
83
57
83
61
81
58
87
62
77
56
85
63
80
57
μV
RMS
10/41
TS4962M Electrical characteristics
Ω
Table 7. VCC= +3V, GND = 0V, VIC=2.5V, T
= 25°C (unless otherwise specified)
amb
(1)
Symbol Parameter Conditions Min. Typ. Max. Unit
I
I
STBY
V
Supply current No input signal, no load 1.9 2.7 mA
CC
Standby current
Output offset voltage No input signal, RL=8Ω 325mV
OO
(2)
No input signal, V
= GND 10 1000 nA
STBY
G=6dB
0.75
1
0.5
0.6
1
0.21
78
88
60 dB
54 dB
300k
Ω
----------------R
in
in
327k
----------------R
in
Ω
P
THD + N
Output power
out
Total harmonic
distortion + noise
Efficiency Efficiency
Power supply
PSRR
CMRR
rejection ratio with
inputs grounded
(3)
Common mode
rejection ratio
Gain Gain value R
R
F
STBY
PWM
Internal resistance
from Standby to GND
Pulse width modulator
base frequency
THD = 1% max, F = 1kHz, R
THD = 10% max, F = 1kHz, R
L
=4Ω
=4Ω
L
THD = 1% max, F = 1kHz, RL=8Ω
THD = 10% max, F = 1kHz, RL=8Ω
P
out
= 350mW
, G = 6dB, 20Hz < F < 20kHz
RMS
RL=8Ω + 15µH, BW < 30kHz
P
=350mW
out
=8Ω + 15µH, BW < 30kHz
R
L
=0.7W
P
out
=0.45W
P
out
, G = 6dB, F = 1kHz,
RMS
, RL=4Ω + ≥ 15µH
RMS
, RL=8Ω+ ≥ 15µH
RMS
F = 217Hz, RL=8Ω, G=6dB,
V
= 200mV
ripple
F = 217Hz, R
ΔV
=200mV
icm
in kΩ V/V
in
pp
=8Ω, G=6dB,
L
pp
273k
----------------R
273 300 327 kΩ
180 250 320 kHz
W
%
%
SNR Signal to noise ratio A-weighting, P
t
WU
t
STBY
Wake-up time 5 10 ms
Standby time 5 10 ms
= 0.4W, RL=8Ω 82 dB
out
11/41
Electrical characteristics TS4962M
Table 7. VCC= +3V, GND = 0V, VIC=2.5V, T
= 25°C (unless otherwise specified)
amb
(1)
Symbol Parameter Conditions Min. Typ. Max. Unit
f = 20Hz to 20kHz, G = 6dB
Unweighted RL=4Ω
A-weighted RL=4Ω
Unweighted RL=8Ω
A-weighted RL=8Ω
Unweighted R
A-weighted R
V
Output Voltage Noise
N
Unweighted R
=4Ω + 15µH
L
=4Ω + 15µH
L
=4Ω + 30µH
L
A-weighted RL=4Ω + 30µH
Unweighted R
=8Ω + 30µH
L
A-weighted RL=8Ω + 30µH
Unweighted R
A-weighted R
Unweighted R
A-weighted R
1. All electrical values are guaranteed with correlation measurements at 2.5V and 5V.
2. Standby mode is active when V
3. Dynamic measurements - 20*log(rms(V
is tied to GND.
STBY
out
)/rms(V
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
=4Ω + Filter
L
)). V
ripple
is the superimposed sinusoidal signal to VCC @ F = 217Hz.
ripple
83
57
83
61
81
58
87
62
77
56
85
63
80
57
μV
RMS
12/41
TS4962M Electrical characteristics
Ω
Table 8. VCC= +2.5V, GND = 0V, VIC= 2.5V, T
= 25°C (unless otherwise specified)
amb
Symbol Parameter Conditions Min. Typ. Max. Unit
I
I
STBY
V
Supply current No input signal, no load 1.7 2.4 mA
CC
Standby current
Output offset voltage No input signal, RL=8Ω 325mV
OO
(1)
No input signal, V
= GND 10 1000 nA
STBY
G=6dB
0.52
0.71
0.33
0.42
1
0.19
78
88
60 dB
54 dB
300k
Ω
----------------R
in
in
327k
----------------R
in
Ω
P
THD + N
Output power
out
Total harmonic
distortion + noise
Efficiency Efficiency
Power supply
PSRR
CMRR
rejection ratio with
inputs grounded
(2)
Common mode
rejection ratio
Gain Gain value R
R
F
STBY
PWM
Internal resistance
from Standby to GND
Pulse width modulator
base frequency
THD = 1% max, F = 1kHz, R
THD = 10% max, F = 1kHz, R
=4Ω
L
L
=4Ω
THD = 1% max, F = 1kHz, RL=8Ω
THD = 10% max, F = 1kHz, RL=8Ω
P
out
= 200mW
, G = 6dB, 20Hz < F< 20kHz
RMS
RL=8Ω + 15µH, BW < 30kHz
P
= 200W
out
=8Ω + 15µH, BW < 30kHz
R
L
=0.47W
P
out
=0.3W
P
out
, G = 6dB, F = 1kHz,
RMS
, RL=4Ω + ≥ 15µH
RMS
, RL=8Ω+ ≥ 15µH
RMS
F = 217Hz, RL=8Ω, G=6dB,
V
= 200mV
ripple
F = 217Hz, R
ΔV
= 200mV
icm
in kΩ V/V
in
pp
=8Ω, G=6dB,
L
pp
273k
----------------R
273 300 327 kΩ
180 250 320 kHz
W
%
%
SNR Signal to noise ratio A-weighting, P
t
WU
t
STBY
Wake-up time 5 10 ms
Standby time 5 10 ms
= 1.2W, RL=8Ω 80 dB
out
13/41
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