Datex-Ohmeda 7900 - Page 173

8 /Schematics
7900 Ventilator- 1503-0151-000 1-97 8-17
Figure 8-16
Microcontroller board schematic diagram, page 10 of 10
SH8
1R225_REF
TLC354CD
U4
TLC354CD
U4
AD822AR
U9
U9
AD822AR
TLC354CD
U4
TLC354CD
U4
R10
1%
562K
1/8W
1/8W
562K
1%
R66
SH1
VDD_FAIL
MAX8213ACSE
U8
1/8W
20K
1%
R75
10%
50V
C67
0.01UF
10%
50V
C69
0.1UF
SH8
VEL_TST
SH8
5R5_TST
SH8
PRES_PWR
R89
1%
7.68K
1/8W
50V
0.1UF
10%
C70
50V
0.1UF
10%
C3
50V
0.1UF
10%
C68
R23
1%
11K
1/8W
50V
0.1UF
10%
C2
50V
0.1UF
10%
C16
U2
AD822AR
10%
50V
C54
0.1UF
10%
50V
0.1UF
C56
1/8W
10K
1%
R7
1/8W
33.2K
0.1%
R68
1/8W
17.4K
0.1%
R67
1/8W
33.2K
0.1%
R2
R61
0.1%
10.2K
1/8W
10%
50V
C64
0.1UF
1/8W
33.2K
0.1%
R76
1/8W
33.2K
0.1%
R88
R17
0.1%
17.4K
1/8W
R18
0.1%
2.87K
1/8W 1/8W
33.2K
0.1%
R87 R77
0.1%
3.24K
1/8W
R15
0.1%
118K
1/8W
1/8W
10K
0.1%
R74
SH4
P15_FAIL
SH4
N15_FAIL
AD822AR
U7
R24
1%
4.32K
1/8W
U7
AD822AR
R27
1%
11K
1/8W
U2
AD822AR
R25
1%
27.4K
1/8W
R65
1%
2.26K
1/8W
R84
1%
2.26K
1/8W
R72
1%
20K
1/8W
1/8W
2.26K
1%
R11
R8
1%
10K
1/8W
R73
1%
2.26K
1/8W
C63
10%
0.1UF
50V
C53
10%
0.1UF
50V
50V
0.1UF
10%
C55
U5
LM4041AIM-1.2
R16
0.1%
1.82K
1/8W
1/8W
33.2K
0.1%
R9
+5V
-15V
9
8
14
7
6
3
12
1
5
6
7
3
2
8
4
1
13
10
11
5
4
2
VREF
VDD
OUT4
OUT3
OUT2
OUT1
MS
IN4-
IN4+
IN3-
IN3+
IN2+
IN1+
GND
DOUT
DIN+
REF
1.25V
13
12
11
10
7
5
3
4
6
8
16
9
2
15
14
1
+5.5V
+15V_L
-15V+15V
VH_EL
VDD
5
6
7
7
6
5
8
4
3
2
1
8
4
3
2
1
+15V
-
+
1.225V