OPA187

RTD

Pt100

105.8 k

Ÿ

(1)

V

OUT

60.4 k

Ÿ

4.99 k

Ÿ

49.1 k

Ÿ

1 k

Ÿ

1 µF

1 µF

REF5050

15 V

In

Out

(5 V)

0°C = 0 V

200°C = 5 V

Copyright © 2016, Texas Instruments Incorporated

24

OPA187, OPA2187, OPA4187

SBOS807 – DECEMBER 2016

www.ti.com

Product Folder Links: OPA187 OPA2187 OPA4187

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Copyright © 2016, Texas Instruments Incorporated

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)

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.