0°C – 100°C, Hardware-Compensated Ratiometric 3-Wire RTD System Reference Design
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Key Document


This TI Precision Verified Design implements a hardware compensated 3-wire RTD acquisition system that accurately measures temperature from  0°C - 100°C.  The voltage input and reference voltage are placed in a ratiometric configuration in order to reduce the errors from noise and drift and improve overall system accuracy. The ADS1247 simplifies the front-end solution through integration of the required current sources, programmable gain amplifier, and digitally-controlled multiplexer in to one chip. The current sources are chopped to minimize any mismatch between the two sources. The TPS7A4901 adjustable-output, high-PSRR LDO is suggested as a clean power alternative versus the existing USB supply to further improve system accuracy.

  • Measures temperature from 0°C - 100°C from 3-wire RTD
  • Single-Supply Solution
  • Ratiometric configuration
  • Utilizes ADS1247, 24-bit ΔΣ ADC

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Schematic/Block Diagram

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1247  24-Bit, 2kSPS, 4-Ch Delta-Sigma ADC With PGA, Vref and 2x IDACs for Precision Sensor Measurement  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
TPS7A49  150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1247 Download Download
TPS7A49 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1141 12 Dec 2013
Design files (4)
Title Type Size (KB) Date
ZIP 321 10 Jan 2014
PDF 68 10 Jan 2014
PDF 100 10 Jan 2014
ZIP 647 13 Dec 2013
Related Tools & Software

Software development (1)

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