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9.2.2 Resistance Temperature Detector Interface

Figure 9-8 illustrates a 3-wire interface circuit for resistance temperature detectors (RTDs). The circuit

incorporates analog linearization and has an output voltage range from 0 V to 5 V. The linearization technique

employed is described in Analog linearization of resistance temperature detectors analog application journal.

Series and parallel combinations of standard 1% resistor values are used to achieve less than 0.02°C of error

over a 200°C temperature span.

-IN

+IN

INA819

15 V

VOUT

0 V at 0°C

5 V at 200°C

25 mV/°C

-15 V

4.99

100

Pt100 RTD

100

105 k

1.18 k

REF5050

100

VOUT

VIN

GND

OUT

2.87

1.13

Figure 9-8. A 3-Wire Interface for RTDs With Analog Linearization

0.5

1.5

2.5

3.5

4.5

100

150

200

Temperature (°C)

Figure 9-9. Transfer Function of a 3-Wire RTD

Interface

0.002

0.004

0.006

0.008

0.01

0.012

0.014

0.016

0.018

100

150

200

Temperature (°C)

C001

Figure 9-10. Temperature Error Over the Full

Temperature Range

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INA819

SBOS959D – DECEMBER 2018 – REVISED APRIL 2022

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