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3.10 Microphone
The microphone is placed to the front cover and soldered 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 voice-
band 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 C3380 , 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 by 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
R201
1K
R206
2.2K
R208
100
R209
0
C212
0.1u
R211
100
- 45 -
3. TECHNICAL BRIEF
C202
C203
10u
39p
C211
39p
R213
2.2K
CLOSE TO MIC
MIC200
1
2
SOB-413S44-RC3310
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