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| OPA2180 Datasheet, PDF (14/25 Pages) Texas Instruments – 0.1-μV/°C Drift, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift OPERATIONAL AMPLIFIERS | |||
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OPA2180
OPA4180
SBOS584B â NOVEMBER 2011 â REVISED DECEMBER 2011
www.ti.com
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
VDIFF/2
+
VCM
10
-VDIFF/2
U2
½
OPA2180
-15 V
R5
1 kW
RG
500 W
R7
1 kW
-15 V
U5
½
OPA2180
VOUTP
3.3 V
Ref 1
U1
INA159
Ref 2
Sense
VOUTN
VOUT
15 V
Figure 30. Discrete INA + Attenuation for ADC with 3.3-V Supply
1 mF
R1
4.99 kW
RTD
Pt100
(5 V)
R2
49.1 kW
+15 V
Out
In
REF5050
1 mF
R3
60.4 kW
OPA2180
R5
105.8 kW(1)
VOUT
0°C = 0 V
200°C = 5 V
R4
1 kW
(1) R5 provides positive-varying excitation to linearize output.
Figure 31. RTD Amplifier with Linearization
14
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Product Folder Link(s): OPA2180 OPA4180
Copyright © 2011, Texas Instruments Incorporated
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