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


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.

  •  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

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS1220  24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
MSP430FR5949  16 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer  Microcontrollers (MCUs)  Sample & Buy View Design Kits & Evaluation Modules
REF5020  2.048-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
TCA9535  16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers  I2C ICs  Sample & Buy View Design Kits & Evaluation Modules

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Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS1220 Download Download
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MSP430FR5949 Download
REF5020 Download Download
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TCA9535 Download
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User guide (1)
Title Type Size (KB) Date
PDF 10770 16 Nov 2014
Design files (6)
Title Type Size (KB) Date
ZIP 1690 24 Nov 2014
ZIP 10039 24 Nov 2014
PDF 1685 24 Nov 2014
PDF 331 24 Nov 2014
PDF 196 24 Nov 2014
PDF 559 24 Nov 2014
More literature (1)
Title Type Size (KB) Date
ZIP 291 29 Feb 2016
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Reference Designs (5)

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