1
1
2
2
3
3
4
4
5
5
6
6
D
D
C
C
B
B
A
A
-
+
2
3
1
4
8
LM358
U3:1
-
+
6
5
7
LM358
U3:2
VAN
VAN
TP1
TP5
TP8
2
3
A6
D1:1
1
3
A6
D1:2
Q1
11
Q2
12
Q4
14
Q3
13
IN+
1
GS
3
VRef
4
IN
H
5
ESt
16
IN-
2
P
W
D
N
6
StD
15
OSC2
8
O
S
C
1
7
T
O
E
1
0
V
S
S
9
St/GT
17
V
D
D
1
8
MT8870
U11
+5V
+5V
-
+
2
3
1
4
1
1
LM324
U4:1
-
+
6
5
7
LM324
U4:2
-
+
9
10
8
LM324
U4:3
-
+
13
12
14
LM324
U4:4
+5V
TP2
TP3
+5V
+5V
-
+
2
3
1
4
1
1
*
U5:1
-
+
6
5
7
*
U5:2
-
+
9
10
8
*
U5:3
-
+
13
12
14
*
U5:4
+5V
VAN
VAN
2
1
3
1
4
7
*
U10:1
5
6
4
*
U10:2
8
9
10
*
U10:3
12
13
11
*
U10:4
R
1
1
1
R
2
1
2
S
IG
in
1
4
COMPin
3
VCOout
4
IN
H
5
V
C
C
1
6
PC1out
2
C
1
A
6
G
N
D
8
C
1
B
7
VCOin
9
*
U8
+5V
+5V
+5V
CPA
1
C
P
A
2
2A
5
3A
6
M
R
A
7
V
C
C
1
6
G
N
D
8
*
U7:1
1B
12
0B
11
C
P
B
9
C
P
B
1
0
2B
13
3B
14
M
R
B
1
5
*
U7:2
+5V
+5V
11
33
22
100K
R26
11
33
22
100K
R28
VAN
+5V
TP4
+5V
XTAL
1
TX OUT
4
TXD IN
5
TX EN
6
VBIAS
9
V
S
S
1
0
CKD
12
CD
13
RX IN
14
RX SYNC
15
1200/2400
16
4800
17
C
L
K
R
A
T
E
1
8
CDRC
19
V
D
D
2
0
*
U9
+5V
+5V
+5V
+
*
C77
+5V
+
*
C34
C
+5V
2
3
A6
D6:1
1
3
A6
D6:2
+5V
B25
Q1
+5V
T1_IN
11
R1_OUT
12
T1_OUT
14
R1_IN
13
C1+
1
C1-
3
C2+
4
C2-
5
V
C
C
1
6
V
+
2
V
-
6
G
N
D
1
5
MAX232A
U16
+5V
OSC2
42
TCAP
41
D7
39
OSC1
43
A5
7
A6
6
A7
5
A4
8
A3
9
A1
11
A0
12
C4
27
C1
30
C6
25
GND
22
TCMP
38
IR
Q
2
VDD
44
VPP
4
SS
37
B3
16
B0
13
B1
14
A2
10
C5
26
C3
28
C0
31
C2
29
C7
24
B4
17
B7
21
B6
20
R
E
S
1
B2
15
B5
19
SCK
36
MOSI
35
MISO
34
RDI
32
TDO
33
NC4
3
NC1
18
NC2
23
NC3
40
68705C9
U2
P4B:1
P4B:2
P4B:3
BSS
Q2
+5V
PRINTER
N/C
1
VDD
2
CS
3
SK
4
N/C
8
VSS
7
SO
6
SI
5
CAT93C46
U12
+5V
4001
D5
4001
D4
+
470u
C76
5
4
SW1
PWR/VOL
11
33
22
R5
10K
+VIN
OUT
1
SENSE
2
SHDN
3
GND
4
E
R
R
5
VTAP
6
FDBK
7
IN
8
MIC2951
VR1
OUT
1
SENSE
2
SHDN
3
GND
4
E
R
R
5
VTAP
6
FDBK
7
IN
8
MIC2951
VR2
+
1u
C48
+
1u
C54
+5V
-
+
2
3
1
4
1
1
LM324
U6:1
-
+
6
5
7
LM324
U6:2
-
+
9
10
8
LM324
U6:3
-
+
13
12
14
LM324
U6:4
+
1u
C52
VAN
SOURCE
+5VLCD
+5V
BSS
Q3
2
3
A6
D2:1
1
3
A6
D2:2
B25
Q4
P6:1
P6:2
P6:3
P6:4
P6:5
COL1
P6:6
COL2
P6:7
COL3
P6:8
COL4
P6:9
ROW1
P6:10
ROW2
P6:11
ROW3
P6:12
ROW4
P6:13
+5V
CTR
P7:1
P7:2
P7:3
P7:4
P7:5
P7:6
DB5
P7:7
DB6
P7:8
DB7
P7:9
DB4
P7:10
E
P7:11
R/W
P7:12
RS
P7:13
+5V
+5V
+5VLCD
CS
1
SO
2
WP
3
VSS
4
VCC
8
HOLD
7
SCK
6
SI
5
25C320
U13
+5V
+5V
4.032 MHz
Y1
A
11
A
11
X0
12
X0
12
X1
13
X1
13
X
1
4
X
1
4
74HC4053
U15:1
B
10
B
10
Y1
1
Y1
1
Y0
2
Y0
2
Y
15
Y
15
74HC4053
U15:2
C
9
C
9
Z
4
Z
4
Z0
5
Z0
5
Z1
3
Z1
3
E\
6
E\
6
VCC
16
VCC
16
VEE
7
VEE
7
GND
8
GND
8
74HC4053
U15:3
TP7
TP6
VAN
C
1
2
)
JU1
2
_
_
3
+
+
5
6
4
1
7
BYP
BYP
8
LM386
U14
+VIN
B25
Q5
+
47u
C45
2
1
INTERNAL SPEAKER
P5
+5V
+
47u
C40
B25
Q6
+VIN
+5V
VAN
1
1
3
3
2
2
100K
R51
+
2.2u
C46
27K
R81
1
2
)
JU4
1
1
3
3
2
2
100K
R105
VAN
+
4.7u
C36
1
2
MIC
P2
10K
R1
10K
R38
.022u
C1
.022u
C27
100p
C30
100p
C4
10K
R37
10K
R14
.01u
C6
470K
R6
1M
R7
1M
R8
470K
R9
*
JU2
0R
JU3
10K
R44
1M
R15
10K
R109
10K
R49
200K
R17
7.5K
R110
.01u
C73
.001u
C14
39K
R91
100p
C16
100K
R13
.022u
C13
15K
R16
560p
C65
200K
R11
10K
R10
.01u
C15
10K
R18
7.5K
R19
.01u
C17
.01u
C18
27K
R20
1M
R21
150K
R22
.001u
C19
.0022u
C21
.0022u
C22
82K
R30
4.7K
R31
470K
R27
27K
R29
10K
R12
.047u
C20
.0047u
C24
15K
R23
240K
R24
240K
R25
.001u
C25
*
JU8
*
JU6
*
JU7
.1u
C29
100K
R41
47K
R40B
*
R40A
2.7K
R39
10K
R59
20K
R58
10K
R61
20K
R60
10K
R63
20K
R62
10K
R65
20K
R64
10K
R67
20K
R66
10K
R69
20K
R68
10K
R71
20K
R70
20K
R72
20K
R73
.01u
C58
47K
R93
47K
R102
47K
R106
10K
R111
*
JU5
0R
R85
10K
R88
4.7K
R94
+
4.7u
C53
10K
R87
7.5K
R86
560p
C54A
.01u
C12
*
C48A
+
1u
C55
560p
C60
.47u
C56
560p
C2
560p
C3
4.7K
R83
47K
R103
22p
C8
22p
C9
4.7M
R55
+
1u
C51A
560p
C51
47K
R107
.1u
C64
.1u
C50
.1u
C49
4.7K
R36
560p
C26
*
R115
56K
R92
47K
R84
100K
R108
100K
R74
100K
R75
.001u
C42
100p
C41
240K
R76
27K
R89
10K
R112
10K
R90
100p
C66
100p
C67
100p
C68
100p
C69
100p
C70
100p
C71
100p
C72
0R
R95
*
R96
.001u
C57B
.01u
C57A
1K
R78
.001u
C73A
*
C73B
.01u
C38
*
R45
*
C31
22R
R114
22R
R46
47K
R104
4.7K
R33
10K
R52
*
R116
82R
R53
560p
C43
10K
R80
*
C46A
240K
R79
10K
R56
100p
C44
10K
R4
2.2K
R113
.022u
C37
62K
R50
4.7K
R48
7.5K
R47
560p
C39
+5V
+5V
560p
C47
47K
R43
Y25
Q7
47K
R57
+5V
EARPC
MIC
WHT
YEL
BLK
RED
PTT SW
HANDSET
[OPTIONAL]
TILT SW
COR
P1:1
SQ OUT
LTR IN
P1:2
PTT
P1:3
AUDIO OUTPUT
P1:4
+VIN
P1:5
GND
P1:6
MONITOR
P1:7
AUDIO INPUT
LOCAL REMOTE
P1:8
P1:9
P1:10
GOOSE NECK MIC
[OPTIONAL]
EXT PTT IN
SENSE/OFFHOOK & EXT MONITOR
3.58 MHz
Y2
22p
C32
22p
C33
4.7M
R35
+5V
KEYBOARD
LCD
DDU-100
DTMF
DDU-200
5 TONE
DDU-400
DDU-300
GSTAR FORMAT
ZAP FORMAT
DDU-500/600
FFSK
OPTION
MONITOR OUT
CP
CJS
2012-05-11
DML
2014-03-27
C-2
1 of 1
7749
MIDIAN ELECTRONICS, INC.
DATE:
DESIGN:
DWN BY:
REV:
APPR
COPYRIGHT ©
REV
SHEET
PROJECT NUMBER
DOCUMENT NAME
SCHEMATIC
2014
DDU-100/DDU-200
+5V
*
C52A
*
C78
*
C79
.022u
C28
+
2.2u
C63
.1u
C5
.1u
C7
.1u
C10
.1u
C23
.1u
C35
.1u
C61
.1u
C62
.1u
C74
.1u
C75
JUMPER
R82
C77[1uF] USED ONLY FOR
SPECIFIC PROD DATES OF U9
NOTE
10K
R42
.1u
C59
VAN
+5V
GND
P3:1
BLK
EARPC
P3:2
RED
SENSE/EXT MIC
P3:3
SHLD
GND
P3:4
YEL
MIC IN
P3:5
GND
P3:6
GND
P4:1
BLK
P4:2
RED
P4:3
GRN
P4:4
YEL
P4:5
GND
P4:6
PRINT RDY
PRINT DATA
A
B
B
A
CONNECTS TO
U15:1 & U15:2
MIC SENSITIVITY
OUTPUT LEVEL ADJUST
CONNECTS TO U9
1
1
3
3
2
2
1M
R2
1
1
3
3
2
2
1M
R32
1.5K
R97
5.1V
D7
2
1
3
DCJ
*
RJ1
D
D
CONNECTS
TO RJ1
CONNECTS
TO U1:43
FUSE
O
S
C
2
4
2
TCAP
41
D7
39
O
S
C
1
4
3
A5
7
A6
6
A
7
5
A4
8
A3
9
A1
11
A0
12
C4
27
C1
30
C6
25
GND
22
TCMP
38
IRQ
2
V
D
D
4
4
V
P
P
4
S
S
3
7
B3
16
B0
13
B1
14
A2
10
C5
26
C3
28
C0
31
C2
29
C7
24
B4
17
B7
21
B6
20
R
E
S
1
B2
15
B5
19
SCK
36
MOSI
35
MISO
34
RDI
32
TDO
33
N
C
4
3
NC1
18
NC2
23
NC3
40
MC68HC705C8
U1
