OPA187_17 Datasheet, PDF (24/35 Pages) Texas Instruments – Drift, Low Power, Rail-to-Rail Output 36-V Operational Amplifiers Zero-Drift Series

OPA187, OPA2187, OPA4187
SBOS807 – DECEMBER 2016
www.ti.com
8.2.6 RTD Amplifier With Linearization
See Analog Linearization Of Resistance Temperature Detectors, for an in-depth analysis of Figure 47. 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
OPA187
V _OUT
0°C = 0 V
200°C = 5 V
RTD
Pt100
R5
105.8 kŸ ⁽¹⁾
R4
1 kŸ
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(1) R₅ provides positive-varying excitation to linearize output.
Figure 47. RTD Amplifier With Linearization
9 Power Supply Recommendations
The OPAx187 is specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V); many specifications apply from
–40°C to +125°C. The Typical Characteristics presents parameters that can exhibit significant variance with
regard to operating voltage or temperature.
CAUTION
Supply voltages larger than 40 V can permanently damage the device (see the
Absolute Maximum Ratings).
Place 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or high-
impedance power supplies. For more detailed information on bypass capacitor placement, see the Layout
section.
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