TIDA-00168

Thermocouple AFE Using RTD or Integrated Temperature Sensor for Cold Junction Compensation (CJC)

TIDA-00168

Design files

Overview

The sole objective of this reference design is to provide comprehensive details on how to design a simple, robust, and accurate analog front end (AFE) circuit for making precision temperature measurements with thermocouple sensors. TIDA-00168 explains the theory, operation, and complications involved in a step-by-step manner. Additionally, this reference design emphasizes topics like error analysis, the necessity of an anti-aliasing filter, biasing resistors for sensor diagnostics, CJC, linearization technique for sensor data, and the design challenges of printed circuit boards.

Features
  •  Sensor input: K-Type thermocouple
  •  Thermocouple Temperature range of –200°C to 1372°C
  •  Noise free resolution: 0.02ºC
  •  Cold Junction Compensation (CJC) using
  •  Resistance Temperature Detector (RTD) or the internal temperature sensor of the ADS1220
  •  Designed to meet IEC61000-4 Standards:
    • Electrical Fast Transients (EFTs), Electrostatic Discharge (ESD), and Surge
    • Field Transmitter operating temperature range of –40°C to 85°C

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU574.PDF (10770 K)

Reference design overview and verified performance test data

TIDRBW6.PDF (559 K)

Detailed schematic diagram for design layout and components

TIDRBW7.PDF (196 K)

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

TIDRBW8.PDF (331 K)

Detailed overview of design layout for component placement

TIDRBX0.ZIP (10039 K)

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

TIDC772.ZIP (1690 K)

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

TIDRBW9.PDF (1685 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Precision ADCs (<=10MSPS)

ADS122024-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface

Data sheet document-pdfAcrobat PDF open-in-new HTML
I2C general-purpose I/Os (GPIOs)

TCA953516-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers

Data sheet document-pdfAcrobat PDF open-in-new HTML
MSP430 microcontrollers

MSP430FR594916 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer

Data sheet document-pdfAcrobat PDF open-in-new HTML
Series voltage references

REF50202.048-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

Data sheet document-pdfAcrobat PDF open-in-new HTML

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Software

Firmware

TIDA-00168 Firmware – TIDCBV3.ZIP (291 K)

Technical documentation

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Type Title Date
* Design guide Thermocouple AFE Using RTD and Internal Temperature Sensor of ADS1220 for CJC Nov. 16, 2014
Technical article It's in the math: how to convert an ADC code to a voltage (part 2) Apr. 29, 2016
More literature TIDA-00168 Firmware Feb. 29, 2016

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-00095 RTD Temperature Transmitter for 2-wire, 4 to 20-mA Current Loop Systems TIDA-00165 Small Form Factor, 2-Wire 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design TIDA-00189 Isolated Loop Powered Thermocouple Transmitter Reference Design TIDA-00247 Single Chip 2-Wire Loop Powered, 4 to 20mA Current Loop RTD Temperature Transmitter Reference Design TIDA-00459 Highly Efficient Power & Data Transmission for Isolated Low Power Applications Reference Design

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