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TIPD152

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

Design files

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
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

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

download Schematic — TIPD152
TIDR344.PDF (100 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD152
TIDC215.ZIP (647 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD152
TIDR345.PDF (68 K)

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

download Gerber file — TIPD152
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

TPS7A49 — 150-mA, 36-V, low-noise, high-PSRR, adjustable low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Precision ADCs

ADS1247 — 24-Bit, 2kSPS, 4-Ch Delta-Sigma ADC With PGA, Vref and 2x IDACs for Precision Sensor Measurement

Data sheet: PDF | HTML

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Software

Technical documentation

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* User guide Hardware-Compensated Ratiometric 3-Wire RTD System Design Guide Dec. 12, 2013

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