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3. TECHNICAL BRIEF
3.9 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
C207
39p
VINNORN
3.10 Main Speaker
In the case of C2100 , there are 3 different speakers. One is main speaker for the received voice, the
other is loud speaker for playback of ring tone , key tone and other MIDI sounds and another 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
R205
2.2K
R209
100
R208
0
C218
0.1u
R212
100
C202
C203
10u
39p
C208
39p
R215
2.2K
CLOSE TO MIC
- 42 -
MIC200
1
2
SOB-413S44-RC3310
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