3. TECHNICAL BRIEF
- 31 -
3.9 Microphone
The microphone is placed to the front cover and contacted to main PCB. The audio signal is passed to
AIN1P and AININ pins of AD6720. The voltage supply VMIC is output from AD6720, and is a biased
voltage for the AIN1P. The AIN1P and AIN1N signals are then A/D converted by the voiceband ADC
part of AD6720.The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP section of
AD6720 for processing (coding, interleaving etc).
Figure 3-12. Connection between Microphone and AD6535
CLOSE TO MIC
2V5_VMIC
VA205
EVL5M02200
0
R217
EVL5M02200
VA206
C226
39p
10u
C215
1K
R213
100
R216
2.2K
R215
C223
0.1u
C221
39p
C219
39p
R219
100
2.2K
R220
39p
C225
1
2
MIC200
OB4-15L42-C33L
C220
39p
VINNORN
VINNORP
Содержание KG225
Страница 1: ...Date April 2006 Issue 1 0 Service Manual Model KG225 Service Manual KG225 M O B ILE CAM E R A ...
Страница 3: ... 4 ...
Страница 19: ...3 TECHNICAL BRIEF 20 Figure 3 4 SYSTEM INTERCONECTION OF AD6720 EXTERNAL INTERFACE ...
Страница 66: ...4 TROUBLE SHOOTING 67 4 12 KEY backlight Trouble Q300 R359 TEST POINT Figure 21 ...
Страница 79: ... 80 5 DOWNLOAD B Multi Download Procedure 1 Run GSM Multi Download program and select Setting ...
Страница 82: ... 83 5 DOWNLOAD 7 Check if the ADI option is set to Hermes 8 Press OK to end Configuration Select Rate ...
Страница 84: ... 85 6 BLOCK DIAGRAM 6 BLOCK DIAGRAM ...
Страница 85: ... 86 ...
Страница 92: ... 93 KG225 8 PCB LAYOUT ...
Страница 93: ... 94 KG225 8 PCB LAYOUT ...
Страница 101: ... 102 10 STAND ALONE TEST Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 109: ... 110 ...
Страница 125: ...Note ...
Страница 126: ...Note ...