3. TECHNICAL BRIEF
- 42 -
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).
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.
CLOSE TO MIC
10u
C203
0.1u
C218
39p
C202
1K
R200
2.2K
R215
0
R208
2.2K
R205
C210
39p
100
R209
R212
100
AVL5M02-200
VA203
MIC200
SOB-413S44-RC3310
1
2
C211
39p
AVL5M02-200
VA202
39p
C208
2V5_VMIC
C207
39p
VINNORN
VINNORP
Figure 3-28. Connection between Microphone and AD6537B
Summary of Contents for C2100
Page 1: ...Service Manual Model C2100 Service Manual C2100 P N MMBD0048201 Date April 2005 Issue 1 0 ...
Page 76: ...4 TROUBLE SHOOTING 77 4 10 KEY backlight Trouble Test Points Figure 4 21 ...
Page 104: ... 105 8 PCB LAYOUT ...
Page 105: ... 106 8 PCB LAYOUT ...
Page 113: ...10 STAND ALONE TEST 114 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 117: ...Note 118 ...
Page 119: ......
Page 135: ......