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Reference Designs

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

Texas Instruments

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.

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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 SurgeField Transmitter operating temperature range of –40 °C to 85 °C