3-wire RTD Acquisition System Accurately Measures Temperature From -200°C - 850°C
TIPD120
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Key Document

Description

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

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Design Files

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TI Devices (3)

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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
ADS1248  24-Bit, 2kSPS, 8-Ch Delta-Sigma ADC for Precision Sensor Measurement  Analog-to-digital converters (ADCs)  Sample & Buy Not Available
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
ADS1248 Download Download
TPS7A49 Download Download
Download Download

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Technical Documents

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User guides (2)
Title Type Size (KB) Date
PDF 799 02 Jul 2014
PDF 1419 02 Jul 2014
Design files (3)
Title Type Size (KB) Date
PDF 74 11 Nov 2013
PDF 188 11 Nov 2013
ZIP 316 11 Nov 2013
Related Tools & Software

Software (2)


Models (1)

Title Category Type Size (KB) Date Views TI Recommends
OPA333 TINA-TI Reference Design (Rev. F) TINA-TI Reference Design TSC 318 KB 27 Feb 2019

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