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
0.1u
C14
0.1u
C12
0.1u
C1
0.1u
C11
0.01u
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
C
0.1u C9
0.1u
C2
0.1u
C3
0.1u
C4
0.1u
C5
0.1u
C6
0.1u
C
0.1u
C10
4. u
AN-CH0
AN-CH1
AN-CH2
AN-CH3
AN-CH4
AN-CH5
AN-CH6
AN-CH7
R9
4.99
C2
4. u
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
07266B DCN6845
D-23