LG F3000 - Microphone; Main Speaker

3. TECHNICAL BRIEF
- 44 -
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 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).
3.10 Main Speaker
CLOSE TO ABB
CLOSE TO MIC
R212
100
2.2K
R209
C202
10u
C211
0.1u
C209
39p
R207
100
MIC201
SOB-413S44-RC3310
1
2
R200
1K
C216
R205
2.2K
39p
R208
0
C210
39p
VA201
EVL5M02200
2V5_VMIC
EVL5M02200
VA202
C215
39p
39p
C201
VINNORP
VINNORN
(GPIO_17)
(GPIO_46)
(GPIO_16)
C715 0.1u
0.1u
C712
VBAT
NA
R701
R706
100K
0.1u
C714
C705
1u
R705
100K
2V8_NEC_AVDD
R707
0
470nC711
1u
C706
NC2
C4
NO1
A4
NO2
B4
V+
MAX4684EBC_T
C3
COM1
A3
COM2
B1
GND
C2
IN1
A2
IN2
C1
NC1
A1
C709
U302
20KR704
470n
1u
C707
R702 100K
U306 LM4809LQX-NOPB
9
BGND
BYPASS
34
GND
8
VDD
VIN1
2
VIN2
6
1
VOUT1
7
VOUT2
_SHDN
5
6
VDD1 VDD2
13
VINL+
9
8
VINL-
2
VINR+
VINR-
1
10
_SHDN
GAIN_SEL
3
GND1
5
GND2
12
4
LOUT1
LOUT2
7
PGND
15
ROUT1
11
14
ROUT2
LM4666SDX
U301
100KR700
0.1uC713
2V8_NEC_AVDD
C710 0.1u
2V8_NEC_AVDD
R703 20K
0.1u
C708
_PREAMP_SHDN
SPK_L_N
SPK_L_P
SPK_R_N
SPK_R_P
_SPKAMP_SHDN
SPKPH_EN
SPKP_OUT_P
Figure 3-21. Connection between Microphone and AD6535
Figure 3-22. MAIN SPEAKER
39pC143
LGND DGND
GPI
C2
AOUT2N1
R9
AOUT2N2
R11
AOUT2P1
T11
AOUT2P2
J16
AOUT3L
K16
AOUT3R
AOUT1N
T9
39pC145
C144 39p C146 39p
SPKP_OUT_P
AUX_SPK_L
AUX_SPK_R