0°C – 100°C, Hardware-Compensated Ratiometric 3-Wire RTD System Reference Design TIPD152 (ACTIVE)

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Key Document

Description

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.

Features
  • 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  Wide VIN, 150-mA, ultra-low-noise, high-PSRR low-dropout (LDO) linear regulator  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
Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 1141 12 Dec 2013
Design files (3)
Title Type Size (KB) Date
ZIP 321 10 Jan 2014
PDF 68 10 Jan 2014
PDF 100 10 Jan 2014
Related Tools & Software

Software (2)



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