Microphone; Main Speaker - LG MG300d Service Manual

3. TECHNICAL BRIEF

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 AIN2P. The AIN2P and AIN2N 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).
U202
NLAS4684FCT1
C4
MULTI_MIC_P NO1 IN1
A4
MULTI_MIC_N NO2 IN2
C1
VINNORP
NC1 COM1
A1
VINNORN
NC2 COM2
Figure 3-28. Connection between Microphone and AD6535

3.11 Main Speaker

B8
SPOUT2L
B7
SPOUT1L
H8
SPOUT2R
J8
SPOUT1R
E8
TXOUT
D7
EXTOUT
G7
EXC
C2
MIC_PATH_SEL
A2
C3
A3
C221
1u
C717 C718
47p 47p
- 56 -
2V5_VMIC
CLOSE TO MIC
R212
1K
R213 C214 C213
39p 10u
2.2K
R214 R215
100 0
C215 C216
39p
39p
C217
R216
100 0.1u
R217
C218 C219
2.2K 39p 39p
R710
0
C716
NA
R715
NA R716 0
SOB-413S44-RC3310
MIC200
1
2
SPK_N
SPK_P