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Применения > > Thermocouple Temperature Measurement System with Amplifier - Based Cold Junction Compensation

Thermocouple Temperature Measurement System with Amplifier - Based Cold Junction Compensation (CN0271)

The circuit shown in Figure 1 is a complete thermocouple signal conditioning circuit with cold junction compensation followed by a 16-bit sigma-delta (Σ-Δ) analog-to-digital converter (ADC). The AD8495 thermocouple amplifier provides a simple, low cost solution for measuring K type thermocouple temperatures, including cold junction compensation.


A fixed gain instrumentation amplifier in the AD8495 amplifies the small thermocouple voltage to provide a 5 mV/°C output. The high common-mode rejection of the amplifier blocks commonmode noise that the long thermocouple leads can pick up. For additional protection, the high impedance inputs of the amplifier make it easy to add extra filtering.


The AD8476 differential amplifier provides the correct signal levels and common-mode voltage to drive the AD7790 16-bit, Σ-Δ ADC.


The circuit provides a compact low cost solution for thermocouple signal conditioning and high resolution analog-to-digital conversion.


Figure 1. K-Type Thermocouple Measurement System with Integrated Cold Junction Compensation (Simplified Schematic: All Connections Not Shown)

Возможности

  • Typical temperature range of -200 C to +1200 C
  • K-type thermocouple measurement system
  • 16-bit ADC, Low temperature drift
  • Integrated cold junction compensation

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