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Schematic Conventions
3-2
Example Circuits
3.1 Schematic Conventions
Figures 3–1 through 3–6 show schematic examples of circuits that can be
constructed using the universal operational amplifier EVM with shutdown. The
components that are placed on the board are shown in bold. Unused
components are blanked out. Jumpers and other changes are noted. These
examples are only a few of the many circuits that can be built.
3.2 Inverting Amplifier
Figure 3–1 shows area 100 equipped with a single operational amplifier
configured as an inverting amplifier using dual power supplies.
Basic setup is done by choice of input and feedback resistors. The transfer
function for the circuit as shown is:
V
OUT
V
IN
R112
R109
To cancel the effects of input bias current, set R105 = R112 || R109, or use a
0-Ω jumper for R105 if the operational amplifier is a low input bias operational
amplifier.
Figure 3–1. Inverting Amplifier With Dual Supply Using Area 100
C107 C108
C105 C104
V1+
V1–
V1+
GND1
V1–
Power Supply Bypass
+
–
7
6
4
3
2
V1+
V1–
R112
C109
R114
C110
R110
R109
R104
R103
R102
R105
C101
C102
A OUT
A101–
A102–
A103+
A104–
R111
C
R
A
U102
R113
Voltage Reference
U101
V1+
VREF1
R108
+
–
V
in
V
OUT
= –V
IN
R112
R109
R105 = R112 II R109,
or Short if Using Low
Input Bias Op Amp
Not Used
0.1 µF 10 µF
0.1 µF 10 µF
8
SD
A1 FLT
R106
C103
C106
+
–
1
3
2
V1–
5
R101
R107
Optional
5.6 k
100 k
6