RTD replacement for cold junction compensation reference design in a temperature sensor


Design files


Temperature-sensing applications that use a thermocouple (TC) require an accurate local temperature sensor to achieve high accuracy. Solutions for design challenges such as cold-junction compensation (CJC) or including an ultra-low power TC analog front-end are highlighted and addressed in this reference design. Performance in terms of power consumption and accuracy is optimized for accurate 4 to 20 mA sensors while also demonstrating the performance of different CJC and TC front-end implementations.

  • Ultra-low power TC front end: < 200 µA
  • RTD type performance with silicon temperature sensors
  • 16-bit ADC for 0.05 °C resolution
  • Comparing different CJC solutions
  • TC temperature from -270 °C to 1200 °C
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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.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRZC7.ZIP (1712 K)

Files used for 3D models or 2D drawings of IC components


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

TIDRZC6.PDF (2097 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Analog temperature sensors

LMT700.1C analog temperature sensor, -5.19 mV/C, high-precision matched pairs, output enable pin

Data sheet: PDF | HTML
Analog temperature sensors

TMP2351C analog temperature sensor, 10 mV/C

Data sheet: PDF | HTML
Digital isolators

ISO7721Robust EMC, dual-channel, 1/1, reinforced digital isolator

Data sheet: PDF | HTML
Digital temperature sensors

LMT010.5°C Accurate 2-pin Temperature Sensor with a Pulse Train Interface

Data sheet: PDF | HTML
Digital temperature sensors

TMP1170.1°C digital temperature sensor, 48-bit EEPROM, PT100/PT1000 RTD replacement

Data sheet: PDF | HTML
Instrumentation amplifiers

INA317Micro-power (50µA), zero-drift (75µV offset, 0.3µV/˚C), precision RRO instrumentation amplifier

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS727250-mA, ultra-low-IQ, low-dropout voltage regulator with enable

Data sheet: PDF | HTML
Load switches

TPS229465.5-V, 0.15-A, 400-mΩ load switch with selectable current limit

Data sheet: PDF | HTML
MSP430 microcontrollers

MSP430FR235524-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD

Data sheet: PDF | HTML
Precision ADCs

ADS112U0416-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & UART interface

Data sheet: PDF | HTML
Precision ADCs

ADS714212-bit 140-kSPS 2-ch nanopower SAR ADC with 1.8-V operation in 1.5-mm x 2-mm QFN package

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

LPV821650nA, Precision Zero-Drift Nanopower Amplifier

Data sheet: PDF | HTML
Series voltage references

REF2125Low-drift, low-power, small-footprint series voltage reference with clean start

Data sheet: PDF | HTML

Start development


Technical documentation

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Type Title Date
* Design guide RTD Replacement for Cold Junction Compensation Reference Design (Rev. A) Sep. 13, 2019
Application note RTD Class-AA Replacement With High-Accuracy Digital Temperature Sensors in Field (Rev. A) Jul. 22, 2019

Related design resources

Reference designs

TIDA-010018 Isolated power and data interface for low-power applications reference design

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