Microphone - LG G5300 Service Manual

3. TECHNICAL BRIEF

3.13 Microphone

The microphone is placed to the front cover and contacted to main PCB. The audio signal is passed
to VINNORP (#J10) and VINNORN (#K10) pins of AD6522. The voltage supply 2V45_VAN is output
from ADP3408, and is a bias voltage for both the VINNORP (through R101) and VINAUX (through
R112) lines. The VINNOR or VINAUX signal is then A/D converted by the Voiceband ADC part of
AD6521. The digitized speech is then passed to the DSP section of AD6522 for processing (coding,
interleaving etc.).
C208 0.1u
R206
VINNORP
100
C211 0.1u
R208
VINNORN
100
R213
MIC_ONOFF
1.5K
Figure 3-30. Microphone.
2V45_VAN
R202
1K
C202
C204
NC 10uF
R204
(2012) (2012)
1.2K
C209
C210
39p
39p
C213
R211
39p
1.2K
3
Q203
2
2SC5585
1
CLOSE TO MIC
- 44 -
MIC201
1
2
mic