1
1
2
2
3
3
4
4
D D
C C
B B
A A
Title
Number RevisionSize
A
Date: 1/28/2010 Sheet of
File: N:\PCBMGR\..\06731-3_ADC.SchDoc Drawn By:
Auxiliary I/O Board (ADC)
A
33
RT
06731
1
2
3
4
5
6
7
8
9
P1
ANALOG INPUT
+5V-ISO
CH0
15
CH1
16
CH2
17
CH3
18
CH4
19
CH5
20
CH6
21
CH7
23
NC
4
NC
7
SHTDN 13
VDD 2
VDD 1
SDA 9
SCL 5
A2 10
A1 12
A0 6
REF 27
NC
8
AGND
14
REF-AJ 26
DGND 3
NC
22
NC
24 NC 28
NC 25
NC
11
U1
MAX1270BCAI+
+5V
GND
GND
+5V-ISO
SCL
SDA
ISO-GND
ISO-GND
ISO-GND
+5V-ISO
1 6
52
U4A
NC7WZ17P6X
3 4
U4B
NC7WZ17P6X
ISO-GND
+5V-ISO
ISO-GND
1
3
2
4
5
6
U2
SMS12
C13
0.1uF
C14
0.1uF
C12
0.1uF
C1
0.1uF
C11
0.01uF
YEL
DS2
SCL
YEL
DS1
SDA
GND1
1
NC
2VDD1
3
NC
4SDA1
5
SCL1
6
GND1
7
NC
8
GND2 9
NC 15
VDD2 14
NC 13
SDA2 12
SCL2 11
GND2 16
NC 10
U5
ADuM2251
R1
4.75k
R2
4.75k
C8
0.1uF C9
0.1uF
C2
0.1uF
C3
0.1uF
C4
0.1uF
C5
0.1uF
C6
0.1uF
C7
0.1uF
C10
4.7uF
AN-CH0
AN-CH1
AN-CH2
AN-CH3
AN-CH4
AN-CH5
AN-CH6
AN-CH7
R9
4.99
C27
4.7uF
ISO-GND
+5V-ADC
ISO-GND
ISO-GND
ISO-GND
ISO-GND
R3
2.2k
R5
2.2k
R6
2.2k
1
3
2
4
5
6
U3
SMS12
R4
2.2k
D-36
07270B DCN 6512