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3. TECHNICAL BRIEF
3.10 Microphone
The microphone is placed to the Rear cover and contacted to main PCB. The audio signal is passed to
VINNORP and VINNORN pins of AD6720. The voltage supply VMIC is output from AD6720, and is a
biased voltage for the VINNORP. The VINNORP and VINNORN signals are then A/D
converted by the voiceband ADC part of AD6720.The digitized speech (PCM 8KHz ,16KHz) is then
passed to the DSP section of AD6720 for processing (coding, interleaving etc).
MAIN MIC
VINNORP
VINNORN
Figure 3-12. Connection between Microphone and AD6720
3.11 Main Speaker
AIN1P
N17
AIN1N
P17
AIN2N
R17
AIN2P
L16
AIN3P
L17
AIN3N
H16
AOUT1P
K17
AOUT1N
P15
AOUT2P2
R16
AOUT2P1
R15
AOUT2N1
P14
AOUT2N2
H17
AOUT3P
J17
AOUT3N
G11
TDO_ABB
F13
TMS
E13
TDI_ABB
F12
LGE Internal Use Only
2V5_VMIC
R219
1K
R220
C227
1K
39p
FB201
SFBH0008102
R221
100ohm
C228
39p
C230
R222
100ohm
0.1u
R223
2.2K
SPKP_P
AUXOP
AUXOP
AUXON
AUXON
- 34 -
ECTH0004806
C226
22uF
BOS-T1342SDN3-LH
SUMY0010509
R232
NA
C229
39p
R233
NA
C231
C232
NA
NA
VA202
EVLC18S02003
R119
4.7
R123
4.7
C131
C132
C133
C134
R125
NA
39p
39p
39p
39p
Copyright © 2007 LG Electronics. Inc. All right reserved.
MIC200
1
2
VA203
EVLC18S02003
VINNORP
VINNORN
AUXIN
AUXIP
REC_P
C130
39p
REC_N
C135
C136
39p
39p
Only for training and service purposes
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