Microphone; Main Speaker - LG S5000 Service Manual

3.10 Microphone

The microphone is placed to the front cover and contacted to main PCB. The audio signal is passed to
AIN1P and AIN1N pins of AD6537B. The voltage supply VMIC is output from AD6537B, and is a
biased voltage for the AIN1P. The AIN1P and AIN1N signals are then A/D converted by the voiceband
ADC part of AD6537B.The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP section of
AD6527 for processing (coding, interleaving etc).
Figure 3-28. Connection between Microphone and AD6537B
VINNORP
C210
39p
VINNORN

3.11 Main Speaker

In the case of G692 , there are 3 different speakers. One is main speaker for the received voice,
another are loud speaker for playback of ring tone , key tone and other MIDI sounds and the other is
headset speaker.
The main speaker is driven directly from AD6537B AOUT1P and AOUT1N pins and the gain is
controlled by the PGA in an AD6537B. The receiver is placed in the folder cover and connected to
AOUT1x terminal via FPCB.
2V5_VMIC
R200
1K
R204 C203
39p
2.2K
R231 R207
100 0
C213
R210
100 0.1u
R214
2.2K
- 43 -
3. TECHNICAL BRIEF
CLOSE TO MIC
C204
10u
C233
39p
C215 C216
39p 39p
SOB-413S44-RC3310
MIC200
1
2