OPA188-Q1 Datasheet, PDF (27/37 Pages) Texas Instruments – Precision, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift, Automotive-Grade Operational Amplifier

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OPA188-Q1, OPA2188-Q1
SBOS860 – APRIL 2017
9.2.6 RTD Amplifier With Linearization
See Analog Linearization Of Resistance Temperature Detectors for an in-depth analysis of Figure 49. Click the
following link to download the TINA-TI file: RTD Amplifier with Linearization.
15 V
1 µF
(5 V)
R2
49.1 kŸ
Out
In
REF5050
R3
60.4 kŸ
1 µF
R1
4.99 kŸ
OPA188-Q1
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 49. RTD Amplifier With Linearization
10 Power Supply Recommendations
The OPAx188-Q1 series is specified for operation from 4 V to 36 V (±2 V to ±18 V); many specifications apply
from –40°C to +125°C. 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 Layout.
Copyright © 2017, Texas Instruments Incorporated
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Product Folder Links: OPA188-Q1 OPA2188-Q1