- 44 -
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. BB Circuit Technical brief
GM310f service manual
3.13.1 Audio amplifier
GM310
use external AMP(LM49150).
LM49150 combines a high efficiency Class D audio power amplifier with a stereo Class AB capacitor-
less Direct Drive headphone amplifier.
LM49150 delivers up to 725mV from a 3.7V supply into an 8ohm load with 87% efficiency to extend
battery life.
[Figure 3.13.1-1] Audio AMP circuit diagram
3.13.2 Microphone circuit
[Figure 3.13.2-1] Microphone circuit diagram
M
E
T
S
Y
S
B
U
S
O
I
D
U
A
D
S
_
8
V
1
9
0
4
C
u
0
1
u
2
.
2
4
4
4
C
3
4
4
C
u
2
.
2
T
A
B
V
8
0
4
C
u
1
.
0
n
0
2
2
6
3
4
C
u
5
1
0
.
0
2
3
4
C
9
3
4
C
8
3
4
C
u
1
.
0
u
0
1
B4
2
D
O
D
L
_
O
V
C4
VSSCP
CIN
CIP
D4
A2
GND
GND_CP
E4
D
D
V
C
2
I
1
A
1
C
N
I
L
T
U
O
L
3
E
+
O
N
O
M
4
A
-
O
N
O
M
3
A
+
N
I
_
O
N
O
M
1
E
1
D
-
N
I
_
O
N
O
M
2
C
T
U
O
R
N
I
R
2
E
L
C
S
3
B
2
B
A
D
S
B1
VDDA
VDDLS
3
0
4
U
X
L
T
0
5
1
9
4
M
L
S
S
A
P
Y
B
3
C
D3
0
3
4
C
u
1
1
3
4
C
u
1
n
0
2
2
7
3
4
C
u
5
1
0
.
0
u
2
.
2
3
3
4
C
2
4
4
C
u
2
.
2
5
4
4
C
L
_
T
U
O
_
O
I
D
A
R
R
_
T
U
O
_
O
I
D
A
R
L
_
T
U
O
_
S
H
P
_
V
C
R
_
K
P
S
N
_
V
C
R
_
K
P
S
R
_
T
U
O
_
S
H
L
C
S
A
D
S
P
_
R
A
E
N
_
R
A
E
T
U
O
R
T
U
O
L
C
I
M
N
I
A
M
H
n
0
0
1
1
0
1
L
2.2u
C101
6
0
1
C
p
9
3
u
1
.
0
3
0
1
C
p
9
3
5
0
1
C
2
1
G 3
2
G
4
O
1
P
B
P
-
H
5
R
H
0
1
4
0
U
P
S
1
0
1
C
I
M
P
_
C
I
M
V
u
1
.
0
4
0
1
C
D
N
G
_
C
I
M
V
N
_
C
I
M
_
N
I
A
M
P
_
C
I
M
_
N
I
A
M
D
N
G
_
C
I
M
V
Содержание GM310
Страница 1: ...Service Manual Model GM310 Internal Use Only Service Manual GM310 Date April 2009 Issue 1 0 ...
Страница 141: ... 142 LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 159: ... 160 LGE Internal Use Only Copyright 2009 LG Electronics Inc All right reserved Only for training and service purposes ...