TIDA-00168
Thermocouple AFE Using RTD or Integrated Temperature Sensor for Cold Junction Compensation (CJC)
TIDA-00168
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)
ADS1220 — 24-bit, 2-kSPS, 4-ch, low-power, small-size delta-sigma ADC w/ PGA, VREF, 2x IDACs & SPI interface
Data sheetI2C general-purpose I/Os (GPIOs)
TCA9535 — 16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers
Data sheetMSP430 microcontrollers
MSP430FR5949 — 16 MHz MCU with 64KB FRAM, 2KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer
Data sheetSeries voltage references
REF5020 — 2.048-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference
Data sheetStart development
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
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