OPA189 Datasheet, PDF (26/34 Pages) Texas Instruments – Precision, 36-V, 14-MHz, MUX-Friendly Low-Noise, Rail-to-Rail Output, Zero-Drift Operational Amplifiers

OPA189, OPA2189, OPA4189
SBOS830 – JUNE 2017
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9.2.7 RTD Amplifier With Linearization
See Analog Linearization Of Resistance Temperature Detectors (SLYT442) for an in-depth analysis of Figure 18.
Click the following link to download the TINA-TI file: RTD Amplifier with Linearization.
1 µF
(5 V)
R2
49.1 kŸ
15 V
Out
In
REF5050
1 µF
R3
60.4 kŸ
R1
4.99 kŸ
OPAx189
V _OUT
0°C = 0 V
200°C = 5 V
RTD
Pt100
R5
105.8 kŸ ⁽¹⁾
R4
1 kŸ
Copyright © 2017, Texas Instruments Incorporated
(1) R₅ provides positive-varying excitation to linearize output.
Figure 18. RTD Amplifier With Linearization
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