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

(ACTIVE) 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

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.


  




TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1247  24-Bit, 2kSPS, 4-Ch ADC With PGA, Reference, and IDAC 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 View Design Kits & Evaluation Modules
TPS7A49  Vin 3V to 36V, 150mA, Ultra-Low-Noise, High-PSRR Low-Dropout (LDO) Linear Regulator  Linear Regulator (LDO)  Sample & Buy View Design Kits & Evaluation Modules

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (2)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1419 02 Jul 2014 1,286
PDF 799 02 Jul 2014 307
Design files (3)
Title Abstract Type Size (KB) Date Views
PDF 74 11 Nov 2013 370
PDF 188 11 Nov 2013 996
ZIP 316 11 Nov 2013 214
Related Tools & Software

Software (2)


Models (1)

Title Category Type Size (KB) Date Views TI Recommends
OPA333 TINA-TI Reference Design (Rev. D) TINA-TI Reference Design TSC 290 KB 29 Mar 2018 257 views

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