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TIPD120

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

Design files

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
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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 — TIPD120
SLAC590.ZIP (9891 K)

Detailed schematic diagram for design layout and components

download Schematic — TIPD120
TIDR286.PDF (188 K)

Detailed schematic diagram for design layout and components

download Bill of materials (BOM) — TIPD120
TIDR287.PDF (74 K)

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

download Gerber file — TIPD120
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

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Precision ADCs

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Precision ADCs

ADS1248 — 24-bit, 2-kSPS, eight-channel delta-sigma ADC for precision sensor measurement

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Software

Design tools & simulation

Simulation model

OPAx333 TINA-TI Reference Design (Rev. G) — SBOC083G.TSC (323 K)

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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
User guide Signal Conditioning and Linearization of RTD Sensors (TIPD120) Jul. 02, 2014

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