Headset Jack Interface - LG C1100 Service Manual

3. TECHNICAL BRIEF

3.12 Headset Jack Interface

This phone chooses a 3-pole type ear-mic jack which has three electrodes such as Receiver
+, Mic+, and GND. This type usually supports only single-ended configuration in the audio
path. But most of phones use the common interface.
AD6537B
AIN2P
AIN2N
AIN3L
AIN3R
C151 0.1u
C177 C152 C153
C178
39p
39p 39p
39p
VEXT
C196
39p
5
4
R150
1 VCC
JACK_DET
OUT 3
100 GND
C170
2
C171
100p 100p U104
MAX9075EXK-T
Figure 3-27. HANDS-FREE & HEADSET JACK INTERFACE
R130
4.7K
R148
100 VMEM
U105
VMEM
2
VCC
C123
39p
R138
VEXT
2.2K
VIN-
R145 1M
R144 1M
VIN+
R147 330K
- 38 -
VMIC
VMEM
R156 100K
GND
3
IN
VMIC_ON
1
R159
R158
NA
MAX4599EXT-T
1K
R153 R154
R137 1K
39K NA
CLOSE TO EARJACK
R181
R141
4.7
VA154
C165 C168
C167
TC153 C179
39p 39p 18p
10u 39p SP114
HOOK_DET
C124
0.1u
J102
2
4
4.7 3
1
5
VA153
HEADSET JACK
SP115