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3.10 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 AD6535. The voltage supply VMIC is output from AD6535, and is a biased
voltage for the AIN1P. The AIN1P and AIN1N signals are then A/D converted by the voiceband ADC
part of AD6535.The digitized speech (PCM 8KHz ,16KHz) is then passed to the DSP section of
AD6527B for processing (coding, interleaving etc).
2V5_VMIC
U100
MAX4684EBC_T
C4
C2
MULTI_MIC_P
NO1
IN1
A4
A2
MULTI_MIC_N
NO2
IN2
C1
C3
NC1
COM1
A1
A3
NC2
COM2
Figure 3-23. Connection between Microphone and AD6535
3.11 Main Speaker
B8
SPOUT2L
B7
SPOUT1L
H8
C210
SPOUT2R
47p
J8
SPOUT1R
E8
TXOUT
TP102
GPIO40
MIC_PATH_SEL
MIC_P
MIC_P
MIC_N
MIC_N
C130
1u
Speaker
SPK_N
SPK_P
C211
47p
Figure 3-24. MAIN SPEAKER
- 47 -
3. TECHNICAL BRIEF
2V5_VMIC
R103
1K
R104
C102
C103
39p
22u
2.2K
R105
100
C104
39p
C106
R116
100
0.1u
C117
R117
39p
2.2K
D303
C313
47p
PG05DBTFC
SPK_N
Close to SPEAKER
SPK_P
D304
C316
47p
PG05DBTFC
CLOSE TO MIC
MIC100
C105
1
39p
2
OSF213-42D
C118
39p
TP001
TP003
TP002
TP004
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