3. TECHNICAL BRIEF
- 45 -
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).
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.
CLOSE TO MIC
C215
39p
C211
39p
39p
C216
2V5_VMIC
R211
100
0
R209
2.2K
R206
AVL5M02-200
VA203
1
2
MIC200
SOB-413S44-RC3310
C203
10u
39p
C202
2.2K
R213
1K
R201
0.1u
C212
100
R208
C210
39p
AVL5M02-200
VA202
VINNORN
VINNORP
Figure 3-28. Connection between Microphone and AD6537B
Содержание C3380
Страница 1: ...Service Manual Model C3380 Date November 2005 Issue 1 0 Service Manual C3380 ...
Страница 3: ... 4 ...
Страница 83: ...4 TROUBLE SHOOTING 84 4 11 KEY backlight Trouble Test Points Figure 4 22 ...
Страница 98: ...4 TROUBLE SHOOTING 99 Yes No Yes No Replace M201 Establish a call Replace U101 Software Re_download ...
Страница 109: ...Note 110 ...
Страница 116: ... 117 8 PCB LAYOUT ...
Страница 117: ... 118 8 PCB LAYOUT ...
Страница 125: ...10 STAND ALONE TEST 126 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 129: ... 130 ...
Страница 131: ... 132 ...