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SBAA180B–January 2011–Revised May 2016
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Copyright © 2011–2016, Texas Instruments Incorporated
Example Temperature Measurement Applications Using the ADS1247 and
ADS1248
Application Report
SBAA180B–January 2011–Revised May 2016
Example Temperature Measurement Applications Using
the ADS1247 and ADS1248
Robert Burnham and Nagaraj Ananthapadamanabhan .......................................... High-Performance Analog
ABSTRACT
This document discusses the use of the ADS1247 and ADS1248 precision analog-to-digital converters
(ADCs) together with a resistive temperature device (RTD) and thermocouple to measure temperature.
Included are detailed examples of the most common configurations of a two-wire RTD, a three-wire RTD,
a four-wire RTD, and a thermocouple with cold junction compensation. This document provides sufficient
information to enable several alternate configurations to be implemented.
Contents
1 Introduction ................................................................................................................... 2
2 Two-Wire RTD Application ................................................................................................. 2
3 Three-Wire RTD Application ............................................................................................... 3
4 Four-Wire RTD Application................................................................................................. 3
5 Thermocouple Application with RTD-Based Cold Junction Compensation .......................................... 4
6 Three-Wire RTD Measurement: Design Example....................................................................... 5
7 Conclusion.................................................................................................................... 7
8 Related Documentation..................................................................................................... 7
List of Figures
1 Two-Wire RTD Application Example ...................................................................................... 2
2 Three-Wire RTD Application Example .................................................................................... 3
3 Four-Wire RTD Application Example...................................................................................... 4
4 Thermocouple-Based Application Example .............................................................................. 4
5 Three-Wire RTD Application Design Example........................................................................... 5
