LG GD910 - Audio

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. BB Circuit Technical brief
GD910 service manual
3.10 Audio
3.10.1 Audio amplifier
GD910 use an external audio amplifier for speaker.
TPA2005D1 is 1.1W speaker amplifiers with supporting differential input and direct drive .
[Figure 3.10.1-1] Speaker AMP circuit diagram
3.10.2 Microphone circuit
[Figure 3.13.2-1] Microphone circuit diagram
AUDIO AMP
100K
R219
1u
C253
RCLAMP0521P_TCT
RCLAMP0521P_TCT ZD201
ZD200
C265
22p
22n
C257
C264
22p
82K
R217
L417
VDD2
D4
VO+
VO-
A4
A1
_SD
120nH
GND1
A2 A3
GND2 GND3
B3 C2
GND4 GND5
C3 D2
GND6 GND7
D3
IN+
C1
IN-
D1
B1
NC
B4
VDD1
C4
U202
TPA2005D1ZQYR
R218
82K
C251
22n
120nHL418
CN204
1
2
VBAT
SPK_AMP_EN
SPK_OUT_P
SPK_OUT_N
MIC
1K
R215
2700
R214
C242
39p
33p
C238
33nC235
SOB-311S44-RC10W
MIC200
1
2
1u
C243
DNI
C236
C237
33n
2700
R213
C241
39p
MIC_P
MIC_N
VMIC_P