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3. HW Circuit Description
3.10 Audio Interface
3.10.1 Uplink Path
A voice signal is converted to electrical signal with Microphone. The converted electrical voice signal is
amplified and converted to digital signal in ABB(T3031). The converted digital data is encoded to GSM
voice standard in DBB(LOCOSTO).
The audio signals from main microphone goes to MICP and MICN of ABB and the voice signal from
head-set to HSMIC of ABB. The bias voltage for microphone is 2V for main mic. and 1.8V for head-set
mic, which bias voltage is generated in ABB(MICBIAS, V_IO)
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3-10-1 Main Mic interface
VA205
0.1u
C220
DNI
R225
0
R227
22n
C224
C221
10u
1K
R214
39p
C217
C223
DNI
SPM0204LE5-QB
2
G1
3
G2
G3
4
G4
6
OUT
1
5
PWR
MIC200
DNI
C225
100nH
L200
L201
100nH
MICBIAS
C222
22n
MICIN
MICIP
Содержание CP150
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