OPA2180
OPA4180
SBOS584B –NOVEMBER 2011–REVISED DECEMBER 2011
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APPLICATION EXAMPLES
The application examples of Figure 30 and Figure 31 highlight only a few of the circuits where the OPAx180
family of devices can be used.
15 V
U2
½
VOUTP
OPA2180
3.3 V
R5
VDIFF/2
-15 V
1 kW
Ref 1
Ref 2
RG
500 W
R7
U1
INA159
VOUT
+
1 kW
VCM
10
Sense
-15 V
-VDIFF/2
U5
½
VOUTN
OPA2180
15 V
Figure 30. Discrete INA + Attenuation for ADC with 3.3-V Supply
+15 V
(5 V)
Out
In
REF5050
1 mF
1 mF
R2
49.1 kW
R3
60.4 kW
R1
4.99 kW
0°C = 0 V
VOUT
OPA2180
200°C = 5 V
R5
(1)
RTD
Pt100
105.8 kW
R4
1 kW
(1) R5 provides positive-varying excitation to linearize output.
Figure 31. RTD Amplifier with Linearization
14
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