Schematics

Spreadtrum communications, Inc.
COMPANY:
Hardware DEPT.
DOCUMENT NO.:
DEPARTMENT:
DATED:
DATED:
DATED:
APPROVED:
DESIGNER:
EQA:
ECO NO: DATE:APPROVED:
REVISION RECORD
LTR
A
D
C
6
A
B
C
D
5 4 3 2 1
B
TITLE & REV:
CONFIDENTIAL AND PROPRIETARY
MAIN MIC
RECEIVER
SPEAKER
HEAD MIC
3.5mm Ear Jack
Close to Receiver
Close to BB Close to MIC
Close to Ear Jack
Ear Jack suggest support:
Earphone
Pin 4 & Pin 5
Plug in
Pull out
Connect
Disconnect
L,R,GND,MIC
C3153 L3101
Close to Ear Jack's Pin 2(GND)
CTIA
Close to BB
Close to MIC
TVS3125 is reserved for better ESD defense of FM_ANT IO
1NF
SPK+
SPK-
C3123
100pF
C3118
33pF
C3124
NC
R3131 1K
R3132 1K
C3119
NC
C3120
NC
C3153
1.0nF
C3129
33pF
C3126
100pF
FB3104
1.8Kohm@100MHz
R31081.2K
C3102
4.7uF
R3111 0
R3112 0
C3127
33pF
C3128
33pF
R3125
R3102 100K
L3101
100nH
R3110 33
R3104 33
C3122
1.0uF
C3116
1.0uF
FB3102
1.8Kohm@100MHz
FB3103
1.8Kohm@100MHz
C3101
10uF
C3103
10uF
R3109 10K
R3138 1K
R3139 1K
C3117
100nF
C3109
100nF
C3108
NC
C3110
33pF
C3111
33pF
VR3101 VR3102
VR3106 VR3105 VR3104 VR3103
C3107
NC
C3106
NC
VR3107
R3106 1.5K
R3101 510
C3105
2.2uF
R3105 510
R3103
1.5K
1
1
SP3101
1
1
SP3102
R3114 100K
C3125
15nF
C3130
15nF
C3121
10uF
C3113
2.2uF
A4
SHDN
A2
INN
A1
INP
D3
PVDD
B4
VOP
D4
VON
B2
C2N
B1
C2N
D1
C2P
C1
C1N
D2
C1P
B3
VDD
A3
VDD
C4
GND
C3
GND
C2
GND
U3101
DS_AW8736
FB3105 0
FB3106 0
C3112
4.7uF
C3114
2.2uF
C3115
100nF
C3104
220pF
1 2
R3107 3K
1 2
R3113 3K
1
GND
2
MIC
3
RGT
6
NC
4
LFT
5
DETECT
J6
R2 NC
R3 NC
VR8 VR6
C1
NC
C2
NC
HP_DET
[5]
HEADMIC_IN_DET
[5,14]
HEADMIC_BIAS
HEADMIC_N
[5]
HEADMIC_IN_DET
[5,14]
HEADMIC_P
[5]
EAR_P
[5]
EAR_N
[5]
AMPG_VCOM[5,14]
FM_ANT
[11]
HP_L
[5]
HP_R
[5,14]
MIC_N
[5]
MIC_P
[5]
SPK+
[15]
SPK-
[15]
CON_MIC_P
[15]
CON_MIC_N
[15]
MIC_BIAS
[5]
REC+
REC-
REC+
REC-
VBAT
[6,8,9,15,16,18]
AUDIO_EN_GPIO156
[11]
HP_R
[5,14]
AMPG_VCOM
[5,14]
PAOUT_N
[5]
PAOUT_P
[5]