ICs for Audio Common Use
AN12941A
Audio power IC for notebook PC
■
Overview
The AN12941A is an amplifier IC for stereo
speakers which can output
1
W by
8
Ω
or
2
W by
4
Ω.
The AGC circuit is built-in to prevent the resonance
or the vibration by the speaker's energy and the
clipping distortion what is called "broken up sound."
of the speakers.
Also, to reduce power consumption, AN12941A
has a built-in function which automatically detects the
input signal and can automatically enter power save
mode when there is no signal.
14.00±0.10
(6.90)
(5.45)
56
29
(2.25)
(3.70)
6.10±0.10
8.10±0.20
Seating plane
(1.00)
0.15
±0.0
5
Area of no resin flash
Unit: mm
0.10
■
Features
Speaker amplifier is
1
W
×
2-channel: 8
Ω,
V
CC
=
5
V or
2
W
×
2-channel: 4
Ω,
V
CC
=
5
V
Built-in AGC circuit
Prevention of the resonance or the vibration by
the speaker's energy and the clipping distortion
of the speaker by AGC at excessive input signal
(with AGC on/off switch).
Built-in automatic power saving function
It detects input signals and switches on/off (with
the on/off switch for the automatic power saving).
Operating supply voltage: V
CC
3.0
V to
5.5
V/
V
CC
_SP
3.0
V to
5.5
V
(0.25)
0.50
0.20±0.05
0.10 M
Seating plane
0.10±0.10
(1.00)
1.20 max.
1
28
0° to 8°
0.50±0.10
HSOP056-P-0300A (Lead-free package)
■
Applications
Notebook PC, LCD monitor with speaker
■
Block Diagram
Signal automatic detection SW
Audio signal detection
sensitivity SW
SP power save SW
Main signal mute SW
Standby SW
AGC on level SW
AGC SW
Input1
Input2
Input3
Input4
L
R
AGC
AGC
Automatic detection
Automatic power save
Mix circuit
4
Ω
to 8
Ω
Speaker amplifier
Publication date: April
2004
SDC00056AEB
1
AN12941A
■
Application Circuit Example
AGC on
lebel change
Supply voltage 5 V
10
µF
V
CC
_SP
−2
dBV
+4
dBV
L-channel
SP out
4
Ω
to 16
Ω
−2
dBV
29
30
31
−16
dBV
32
33
34
SP save
on/off
35
36
37
GND
38
39
40
−16
dBV
41
42
GND
+9
dB
43
0 dB
Det.
−16
dBV
0 dB
+14
dB
SP GND
Power
Save
−16
dBV
V
CC
_SP
+14
dB
V
CC
_SP
+14
dB
28
27
26
25
24
+14
dB
SP GND
Mute
23
22
21
0.047
µF
47 kΩ
10
µF
V
CC
_SP
−2
dBV
+4
dBV
R-channel
SP out
4
Ω
to 16
Ω
−2
dBV
Automatic
detection
output
Supply voltage 3.3 V
Save
CTL
Mute
Signal
Det.
Control
10 kΩ
10 kΩ
0.47
µF
0.47
µF
20
GND
19
V
REF
(SP)
18
17
16
15
GND
14
13
12
11
4.7
µF
AGC
on/off
1
µF
100 kΩ
0.47
µF
HP out
L-channel
Audio automatic detection
on/off control
0.47
µF
+9
dB
AGC
+3
dB
AGC
+3
dB
+3
dB
−16
dBV
−16
dBV 44
+3
dB
HP amplifier
L-channel
45
0.47
µF
46
47
48
49
2.4 V
50
51
52
−16
dBV
−16
dBV
HP out
R-channel
HP amplifier
R-channel
−22
dBV
−28
dBV
0
dB
−22
dBV
Audio control
−28
dBV
volume
V
REF
8
0
dB
0
dB
10
9
0
dB
V
REF
0.47
µF
Audio control
volume
V
REF
20 kΩ
−22
dBV
20 kΩ
8
−28
dBV
7
6
−16
dBV
−22
dBV
0.47
µF
STB
−16
dBV
−22
dBV
0.47
µF
1
µF
10 kΩ
0.47
µF
−16
dBV
L-channel in
−22
dBV
0.47
µF
4.7
µF
from modem
−16
dBV 0.47
µF
−22
dBV
−16
dBV
−22
dBV
0.47
µF
Signal
on/off
Signal
on/off
R-channel in
−6
dB
V
REF
53
−22
dBV
−28
dBV
54
−6
dB
55
−22
dBV
−28
dBV
56
−6
dB
Beep
−22
dBV
−28
dBV
−22
dBV
−28
dBV
−6
dB
5
Standby
4
−6
dB
REG
3
2
V
CC
1
from PCcard
−22
dBV
−28
dBV
SP gain high/low SW
from beep
10
µF
2
SDC00056AEB
AN12941A
■
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Note) SP:
HP:
Description
V
CC
SP gain high/low SW
REG ripple filter pin
Input for PCcard
Standby on/off control
R-channel input
Main signal mute on/off control
V
REF
R-channel for volume
Audio mix amplifier R-channel output
Volume control signal R-channel input
R-channel output for HP amplifier
Negative feedback pin for alarm mix
amplifier R-channel
Alarm mix amplifier R-channel output
AGC R-channel output
GND
SP amplifier R-channel input
Signal automatic detection on/off control
AGC on/off control
V
REF
_SP
GND
Demodulation pin for signal automatic detection
Signal automatic detection output
GND_SP R-channel
SP amplifier R-channel positive phase output (+)
SP amplifier R-channel positive phase output (+)
SP amplifier R-channel negative phase output (−)
SP amplifier R-channel negative phase output (−)
V
CC
_SP R-channel
Speaker
Headphone
Pin No.
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
Description
V
CC
_SP L-channel
SP amplifier L-channel negative phase output (−)
SP amplifier L-channel negative phase output (−)
SP amplifier L-channel positive phase output (+)
SP amplifier L-channel positive phase output (+)
GND_SP L-channel
SP power save control
AGC on level control
GND
Signal auto detection amplifier R-channel input
Signal auto detection mix amplifier
R-channel output
AGC demodulation pin
SP amplifier L-channel input
GND
AGC L-channel output
Alarm mix amplifier L-channel output
Negative feedback pin for alarm mix
amplifier L-channel
L-channel output for HP amplifier
Volume control signal L-channel input
Audio mix amplifier L-channel output
Voltage output for AGC level change
Signal auto detection amplifier L-channel input
Signal auto detection mix amplifier
L-channel output
L-channel input
V
REF
Input for modem
GND
Input for beep
REG: Regulator
SDC00056AEB
3
AN12941A
■
Absolute Maximum Ratings
Parameter
Supply voltage
*1
Supply current
Power dissipation
*2
Operating ambient temperature
*3
Storage temperature
*3
Operating ambient atmospheric pressure
Operating constant gravity
Operating shock
Symbol
V
CC
V
CC
_SP
I
CC
P
D
T
opr
T
stg
P
opr
G
opr
S
opr
Rating
5.75
5.75
517
−20
to +75
−55
to +150
1.013
×
10
5
±
0.61
×
10
5
9 810
4 900
Ａ
mW
°C
°C
Pa
m/s
2
m/s
2
Unit
V
Note) *
1:
The values under the condition the above absolute maximum ratings and the power dissipation.
*
2:
T
a
=
75°C,
the value under the condition which this device is mounted on a four-layer printed wiring board and in addition
its radiation part is soldered. (Reference to
■
Technical Data,
•
Power dissipation of package HSOP056-P-0300A)
*
3:
Except for the storage temperature and operating ambient temperature, all ratings are for T
a
=
25°C.
■
Recommended Operating Range
Parameter
Supply voltage
Symbol
V
CC
V
CC
_SP
*
Rating
3.0
to
5.5
3.0
to
5.5
Unit
V
Note) *: The values under the condition the above absolute maximum ratings and the power dissipation.
■
Electrical Characteristics at V
CC
=
5
V, V
CC
_SP
=
5
V
Note) T
a
=
25°C
±
2°C
unless otherwise specified.
Parameter
Circuit current
Circuit current
1A
at non-signal
(V
CC
)
Circuit current
2A
at non-signal
(V
CC
_SP)
Circuit current
1B
at non-signal
(V
CC
)
Circuit current
2B
at non-signal
(V
CC
_SP)
Circuit current
1C
at non-signal
(V
CC
)
Circuit current
2C
at non-signal
(V
CC
_SP)
Symbol
I
VCCA
I
VCCSA
I
VCCB
Conditions
V
CC
=
3.3
V, at non-signal,
Automatic distinction: on
V
CC
=
3.3
V, at non-signal,
Automatic distinction: on
V
CC
=
3.3
V, at non-signal,
Power save: off
at non-automatic distinction
V
CC
=
3.3
V, at non-signal,
Power save: off
at non-automatic distinction
V
CC
=
3.3
V, at non-signal,
Power save: on
at non-automatic distinction
V
CC
=
3.3
V, at non-signal,
Power save: on
at non-automatic distinction
Min
4.4
4.8
Typ
8.7
400
9.5
Max
13.0
600
14.2
Unit
mA
µA
mA
I
VCCSB
8.1
16.2
mA
I
VCCC
4.1
8.1
12.1
mA
I
VCCSC
400
600
µA
4
SDC00056AEB
AN12941A
■
Electrical Characteristics at V
CC
=
5
V, V
CC
_SP
=
5
V (continued)
Note) T
a
=
25°C
±
2°C
unless otherwise specified.
Parameter
Circuit current (continued)
Circuit current
1D
at non-signal
(V
CC
)
Circuit current
2D
at non-signal
(V
CC
_SP)
L-channel audio output level
R-channel audio output level
L-channel audio output
distortion
R-channel audio output
distortion
L-channel audio output noise
R-channel audio output noise
L-channel maximum output
power
R-channel maximum output
power
L-channel maximum output
power
R-channel maximum output
power
Cross talk R-channel
→
L-channel
Cross talk L-channel
→
R-channel
AGC output level
Symbol
I
VCCD
I
VCCSD
Conditions
V
CC
=
3.3
V, at standby mode
V
CC
=
3.3
V, at standby mode
Min
Typ
10
10
Max
50
50
Unit
µA
µA
Speaker amplifier
(Pin
52,
pin
6
→
pin
24
to pin
27,
pin
33
to pin
30)
V
OSPL
V
OSPR
TH
SPL
TH
SPR
V
NSPL
V
NSPR
V
IN
=
−22
dBV,
1
kHz, R
L
=
8
Ω
V
IN
=
−22
dBV,
1
kHz, R
L
=
8
Ω
V
IN
=
−22
dBV,
1
kHz, R
L
=
8
Ω,
to THD fifth
V
IN
=
−22
dBV,
1
kHz, R
L
=
8
Ω,
to THD fifth
At non-signal, R
L
=
8
Ω,
A curve filter
At non-signal, R
L
=
8
Ω,
A curve filter
2.0
2.0
0.7
0.7
64
64
5.5
4.0
4.0
0.04
0.04
−65
−74
1.0
1.0
2.0
2.0
68
68
7.0
6.0
6.0
0.5
0.5
−62
−68
8.5
dBV
dBV
%
%
dBV
dBV
W
W
W
W
dB
dB
dBV
V
M8SPL
V
IN
=
1
kHz, at THD =
10%,
R
L
=
8
Ω,
to THD fifth, at AGC = off
V
M8SPR
V
IN
=
1
kHz, at THD =
10%,
R
L
=
8
Ω,
to THD fifth, at AGC = off
V
M4SPL
V
IN
=
1
kHz, at THD =
10%,
R
L
=
4
Ω,
to THD fifth, at AGC = off
V
M4SPR
V
IN
=
1
kHz, at THD =
10%,
R
L
=
4
Ω,
to THD fifth, at AGC = off
V
CTSPL
V
IN
=
−22
dBV,
1
kHz, R
L
=
8
Ω
A curve filter
V
CTSPR
V
IN
=
−22
dBV,
1
kHz, R
L
=
8
Ω
A curve filter
V
AGSPL
V
IN
=
−6
dBV,
1
kHz, RL =
8
Ω
V
AGSPR
A curve filter
V
BESPL
V
IN
=
−10
dBV,
1
kHz, pin
56
input
V
BESPR
V
MDSPL
V
IN
=
−10
dBV,
1
kHz, pin
54
input
V
MDSPR
V
PCSPL
V
IN
=
−10
dBV,
1
kHz, pin
4
input
V
PCSPR
V
IN
=
1
kHz, V
IN
at THD =
1%
V
HPMAL
V
IN
=
1
kHz, V
IN
at THD =
1%
V
HPMAR
Mix amplifier characteristic
1
(Pin
4,
pin
54,
pin
56
→
pin
46,
pin
11)
L-channel, R-channel output
level at beep signal mix
L-channel, R-channel output
level at modem signal mix
L-channel, R-channel output
level at PCcard signal mix
Each entry pin max input level
Maximum amplifier output for
the HP amplifier
−17
−17
−17
0.6
0.3
−16
−16
−16
−15
−15
−15
dBV
dBV
dBV
V[rms]
V[rms]
SDC00056AEB
5
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