LG KG320 - Microphone; Main Speaker

3. TECHNICAL BRIEF
- 47 -
3.10 Microphone
The microphone is placed to the front cover and contacted to main PCB. The audio signal is passed to
AIN1P and AININ pins of AD6535. The voltage supply VMIC is output from AD6535, and is a biased
voltage for the AIN1P. The AIN1P and AIN1N signals are then A/D converted by the voiceband ADC
part of AD6535.The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP section of
AD6527B for processing (coding, interleaving etc).
3.11 Main Speaker
GPIO40
TP102
2V5_VMIC
C3
COM1
A3
COM2
B1
GND
C2
IN1
A2
IN2
C1
NC1
A1
NC2
C4
NO1
A4
NO2
B4
V+
U100
MAX4684EBC_T
1u
C130
MULTI_MIC_P
MULTI_MIC_N
MIC_PATH_SEL
MIC_P
MIC_N
CLOSE TO MIC
R117
2.2K
R103
1K
0.1u
2V5_VMIC
OSF213-42D
MIC100
1
2
C106
C103C102
22u39p
C104
39p
2.2K
R104
C105
39p
39p
C118C117
39p
100
100
R116
R105
VA100
EVLC14S02050 EVLC14S02050
VA101
MIC_P
MIC_N
SPOUT1L
SPOUT1R
J8
B8
SPOUT2L
H8
SPOUT2R
E8
TXOUT
B7
C211
47p
47p
C210
SPK_P
SPK_N
Speaker
Close to SPEAKER
PG05DBTFC
D303
TP002
TP001
TP004
TP003
47p
C316
D304
PG05DBTFC
47p
C313
SPK_P
SPK_N
Figure 3-23. Connection between Microphone and AD6535
Figure 3-24. MAIN SPEAKER