TIPD152

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

TIPD152

Design files

Overview

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

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDR344.PDF (100 K)

Detailed schematic diagram for design layout and components

TIDC215.ZIP (647 K)

Detailed schematic diagram for design layout and components

TIDR345.PDF (68 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDC240.ZIP (321 K)

Design file that contains information on physical board layer of design PCB

Products

Includes TI products in the design and potential alternatives.

Linear & low-dropout (LDO) regulators

TPS7A49150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Precision ADCs (<=10MSPS)

ADS124724-Bit, 2kSPS, 4-Ch Delta-Sigma ADC With PGA, Vref and 2x IDACs for Precision Sensor Measurement

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Support software

TIPD152 Simulation — TIDC241.ZIP (103 K)

Technical documentation

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Type Title Date
* User guide Hardware-Compensated Ratiometric 3-Wire RTD System Design Guide Dec. 12, 2013
Technical article How to calculate the effects of resistor self-heating Mar. 14, 2014

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