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3. TECHNICAL BRIEF
3.8 Microphone
The microphone is placed to the Front cover and contacted to main PCB. The audio signal is passed
to MIC_N and MIC_P pins of AD6721.
The voltage supply VMIC is output from AD6721, and is a biased voltage for the MIC_P. The MIC_P
and MIC_N signals are then A/D converted by the voice band ADC part of AD6721.
The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP section of AD6721 for
processing (coding, interleaving etc).
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.8 Connection between Microphone and AD6721
[Rev.C] Exchange Mic. Polarity
1K
R227
C212
39p
10u
C211
C232
0.1u
39p
C214
EVL5M02200
VA205
VA204
EVL5M02200
C215
39p
100ohm
R231
2.2K
R239
R235
100ohm
2V5_VMIC
39p
C231
MIC200
1
2
OB4-15L42-C33L
2.2K
R230
39p
C213
VINNORN
VINNORP
Содержание KP210
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