TIPD120

3-wire RTD Acquisition System Accurately Measures Temperature From -200°C - 850°C

TIPD120

Design files

Overview

This TI Precision Verified Design provides the theory, component selection, simulation, complete PCB schematic & layout, bill of materials, and measured performance of a single-supply, 3-wire RTD acquisition system that accurately measures temperature from  -200°C - 850°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 by incoorporating the required current sources, programmable gain amplifier, and digitally-controlled multiplexer onto one chip. A "chopping" technique is used to minimize the effects of mismatch between the two current sources. The TPS7A4901 adjustable-output, high-PSRR LDO is suggested as a cleaner power alternative over the existing USB supply to further improve system accuracy.

Features
  • TI Precision Designs: Verified Design
  • Contains Theory, component selection, simulation, complete PCB schematic & layout, bill of materials, and measured performance
  • -200°C - 850°C, 3-wire RTD ratiometric measurement
  • Single, 5V Supply Solution
  • Utilizes ADS1247, 24-bit ΔΣ ADC
  • Utilizes TPS7A4901 ultra-low noise LDO for precision measurements

Design files & products

Design files

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

SLAC590.ZIP (9891 K)

Detailed schematic diagram for design layout and components

TIDR286.PDF (188 K)

Detailed schematic diagram for design layout and components

TIDR287.PDF (74 K)

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

TIDC014.ZIP (316 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
Precision ADCs (<=10MSPS)

ADS124824-Bit, 2kSPS, 8-Ch Delta-Sigma ADC for Precision Sensor Measurement

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

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Software

Support software

TIPD120 Simulation – TIDC016.ZIP (75 K)

Technical documentation

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Type Title Date
* User guide 3-Wire RTD Measurement System, -200°C to 850°C (TIPD120 Verified Design) (Rev. A) Jul. 02, 2014
Technical article Four ways to improve your ADC system power supply rejection Jun. 25, 2015
User guide Signal Conditioning and Linearization of RTD Sensors (TIPD120) Jul. 02, 2014

Support & training

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