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High-Performance Temperature Measurement Using Thermocouples and Precision Delta-Sigma ADCs, Part 2

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Description

Introduction

This two-part series presents the design of a cost-effective, portable, high-resolution data-acquisition system (DAS) based on a precision delta-sigma analog-to-digital converter (ADC). The Part 1 article reviewed the history of thermocouple technology and the principal of the operation. It described a thermocouple interface with the MAX11200 ADC evaluation (EV) kit.1

This Part 2 of the series presents a dedicated reference design (RD) in which the MAX11200 ADC interfaces with a thermocouple and platinum resistance temperature detector (PRTD) using a simple multiplexor. No additional instrumentation amplifiers, low-noise references, and optical isolation are needed for precise temperature measurement. The new RD is cost effective, compact, and low power. We also describe the high-resolution thermocouple’s DAS and the software required to achieve accuracies of ±1°C, or better, using standardized linearization calculation algorithms.

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Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.

 

Maxim Devices (4)

Part Number Name Product Family Order Design kits and evaluation modules
MAX31855 Cold-Junction Compensated Thermocouple-to-Digital Converter Sensor Interface Buy Now Design Kits
MAXQ622 16-Bit Microcontrollers with Infrared Module and Optional USB MCU - Microcontroller Buy Now Design Kits
MAX4782 High-Speed, Low-Voltage, 0.7Ω CMOS Analog Switches/Multiplexers Switches and Multiplexers Buy Now Not Available
MAX11200 24-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADCs with GPIO Analog-to-Digital Converters Buy Now Design Kits

Maxim Devices (4)

Part Number Product Family
Sensor Interface
Cold-Junction Compensated Thermocouple-to-Digital Converter
MCU - Microcontroller
16-Bit Microcontrollers with Infrared Module and Optional USB
Switches and Multiplexers
High-Speed, Low-Voltage, 0.7Ω CMOS Analog Switches/Multiplexers
Not Available
Analog-to-Digital Converters
24-Bit, Single-Channel, Ultra-Low Power, Delta-Sigma ADCs with GPIO

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