Table of Contents
Advertisement
Developer Board Schematics
2,5
VIN
R22
C27
.1uF
3,5
SPKR
16 V
C3
R56
GND
2,3
RING
2,3
TIP
2,5
VIN
VCC
ACT
3
C12
.01uF
GND
VCC
GND
LINK
3
3
RX+
3
RX-
3
TX+
S4-4
S4-1
3
5
2
3
TX-
1
SW-4PDT
SW-4PDT
SHUNT ON:
1&2=OPEN
2&3=100
OHM
3
MIC_N
3
SPK_P
3
SPK_N
3
MIC_P
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers
4.7K
R58
4.7K
3
2
2
R23
10K
10uF
16 V
1K
GND
14
R72
U13A
1
2
R73
47K
Q19
2N3904
7
74LCX04
GND
R74
U13B
3
4
R75
47K
Q21
2N3904
74LCX04
GND
E_RX-
E_RX+
E_TX-
E_TX+
S4-3
S4-2
6
7
10
8
11
4
9
12
SW-4PDT
SW-4PDT
P10
JP10
1
R237
100
R238
2
3
SHUNT
HEADER-3
RX TERM.
C26
10uF
P1
JP1
16 V
1
2
3
SHUNT
U4
LM386
HEADER-3
5
C28
+
100uF
16 V
Safety Isolation Barrier
GND
FB23
FB24
2.7K
2.7K
C57
C56
C55
C54
GND
C42
.001uF
R14
75
GND
2KV
R55
0
R13
75
GND
R3
R2
R10
I_TX+
I_RX+
I_RX-
I_TX-
JP11
P11
SHUNT ON:
1
100
1&2=OPEN
2
3
2&3=100
SHUNT
OHM
HEADER-3
TX TERM.
R240
R241
Chapter 5 – The SocketModem Developer Board
DS1
1
2
GND
SPEAKER
R239
0
CGND
F1
145mA
600-OHM
F2
145mA
600-OHM
CGND
CR3
1
2
15pF
VCC
15pF
3
15pF
15pF
DALC208SC6
R6
0
0
0
0
NOTE:
C192, C193, C194, C195
are not installed on
the board by default.
GND
GND
GND
GND
9.09
9.09
30
C52 220pF
J2
5KV
5
4
6X4-MODJACK
3
2
5KV
C53 220pF
6
5
GND
4
J10
8
7
9
6
10
5
11
4
12
3
13
2
14
CGND
1
8X8-MODJACK-2LEDS
C192 .01uF
CGND
C193 .01uF
CGND
J21
1
2
3
4
5
6
7
8
8X8-MODJACK
C194 .01uF
CGND
C195 .01uF
CGND
HANDSET
BLM18AG102SN1
J22
1
FB26
FB27
2
FB28
3
FB29
4
4X4-MODJACK
Advertisement
Table of Contents
