Analog Devices CN-0271 K-Type Thermocouple Measurement System Application Note

CN-0271 is a K-type thermocouple measurement system composed of AD8495, AD8476, AD7790, ADR441 with integrated cold junction compensation.

Brand: Analog Devices
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 5
File format: PDF
File size: 554 KB
Published: 02 August, 2012
Updated: 30 September, 2023
MD5 checksum: 92EB178038B9F1A820DAA340F325AE6B
PDF: Analog Devices CN-0271 K-Type Thermocouple Measurement System Application Note PDF

About this manual

The document details a complete thermocouple signal conditioning circuit designed for measuring K-type thermocouple temperatures. The system utilizes the AD8495 amplifier for cold junction compensation and signal amplification, driving an AD7790 16-bit sigma-delta ADC via an AD8476 differential amplifier. The circuit provides a compact, low-cost solution for high-resolution analog-to-digital conversion.

What's inside

Circuit Function and Benefits
Circuit Description
Test Results
Common Variations
Circuit Evaluation and Test
Equipment Needed
Getting Started
Functional Block Diagram

Specifications

Temperature Range	15°C to 950°C
Output Voltage Calibration	5 mV/°C
ADC Resolution	16-bit
Noise Free Resolution	13.4 bits
Linearity Error	within 2°C
System Error with Correction	within 1°C

Frequently asked questions

What is the temperature range for the CN-0271 system?

The system is calibrated for a temperature range of 15°C to 950°C.

How does the circuit handle cold junction compensation?

The AD8495 thermocouple amplifier provides integrated cold junction compensation.

What is the noise free resolution of the system?

The measured noise free resolution is approximately 13.4 bits.

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