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OPA180 View Datasheet(PDF) - Texas Instruments

Part NameDescriptionManufacturer
OPA180 0.1-μV/°C Drift, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift Operational Amplifiers TI
Texas Instruments TI
OPA180 Datasheet PDF : 40 Pages
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OPA180, OPA2180, OPA4180
SBOS584D – NOVEMBER 2011 – REVISED MAY 2014
www.ti.com
9.2.2 Discrete INA + Attenuation
The OPA180 can be used as a high-voltage, high-impedance front-end for a precision, discrete instrumentation
amplifier with attenuation. The INA159 provides the attenuation that allows this circuit to easily interface with 3.3-
V or 5-V analog-to-digital converters (ADCs).
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 33. Discrete INA + Attenuation for ADC with 3.3-V Supply
9.2.3 RTD Amplifier
The OPA180 is excellent for use in analog linearization of resistance temperature detectors (RTDs). The below
circuit combines the precision of the OPA180 amplifier and the precision reference REF5050 to linearize a Pt100
RTD.
+15 V
1 mF
(5 V)
R2
49.1 kW
Out
In
REF5050
R3
60.4 kW
1 mF
R1
4.99 kW
RTD
Pt100
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 34. RTD Amplifier with Linearization
20
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