Application Note 9822
Appendix B Schematic Diagrams
(Continued)
+5V A
1
C10
0.1 μ F
+
C31
4.7 μ F
VIN
J1
C12
0.1 μ F
3
NC
+
7
V+
8
C11
0.1 μ F
R5
56.2
NC
NC
6
V IN+
2
-
V-
5
U3
R4
10
4
HFA1109
-5V A
C13
0.1 μ F
R14
499
C39
+ 4.7 μ F
C16
R15
100
R9
0
V DC
A/RpF
R3
A/R
R17 499
+5V A
1
C14
0.1 μ F
+
R16
100
C41 C37
0.01 μ F 0.1 μ F
R6
499
2
NC
-
7
V+
8
NC
NC
6
C38
4.7 μ F
R8
10
V IN-
R7
3
+
V-
5
U4
HFA1109
C15
0.1 μ F
249
4
-5V A
C17
0.1 μ F
C44
+ 4.7 μ F
FIGURE 11. SINGLE-ENDED TO DIFFERENTIAL (OPERATIONAL AMPLIFIER) ANALOG FRONT END
+5V A
+5V A
C3
0.1 μ F
+
C5
4.7 μ F
R1
4.99K
1
7
C8
0.1 μ F
+
C28
4.7 μ F
V+
C6
0.1 μ F
C2
0.1 μ F
+ C1
4.7 μ F
4
1.2V
8
D1
ICL8069CCBA
3
2
NC
+
- V-
4
C4
0.1 μ F
8
NC
NC
5
6
U1
HA5127
-5V A
C25
+ 4.7 μ F
R13
0
C7
0.1 μ F
2.5V
+
C27
4.7 μ F
EXT V REF
R2
R12
249
VR1
1(CCW)
2
499
V EXT
1.0K
3(CW)
V EXT
FIGURE 12. EXTERNAL REFERENCE VOLTAGE GENERATION CIRCUIT
3-9
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