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

Industrial

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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.

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Bill of materials (BOM) — TIPD120

TIDR287.PDF (75 KB)

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

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Gerber file — TIPD120

TIDC014.ZIP (316 KB)

Design file that contains information on physical board layer of design PCB

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Schematic — TIPD120

SLAC590.ZIP (9892 KB)

Detailed schematic diagram for design layout and components

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Schematic — TIPD120

TIDR286.PDF (189 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

Precision ADCs

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

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

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

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Software

Simulation model

SBOC083 — OPAx333 TINA-TI Reference Design

Supported products & hardware

Products

Precision op amps (Vos<1mV)

OPA2333 — 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

OPA2333-HT — High-temperature, 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

OPA2333-Q1 — Automotive, 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

OPA2333A-EP — Enhanced-product, 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier

OPA2333P — 1.8-V, 17-µA, two-channel, micropower zero-drift CMOS operational amplifier with >300-kHz GBW

OPA333 — Micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

OPA333-Q1 — Automotive, micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

OPA333A-EP — Enhanced-product, micropower, 1.8-V, 17-µA zero-drift CMOS precision operational amplifier

Hardware development

Reference design

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

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SBOC083 — OPAx333 TINA-TI Reference Design

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Latest version

Version: 01.00.00.0G

Release date: Sep 10, 2021

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