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Precision RTD instrumentation for temperature sensing

Posted: 02 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:RTD instrumentation? temperature sensing? thermal management?

Precision resistive temperature detector (RTD) instrumentation is key for high performance thermal management applications. This application note shows how to use a high resolution Delta-Sigma ADC, and two resistors to measure RTD resistance ratiometrically. A 0.1C accuracy and 0.01C measurement resolution can be achieved across the RTD temperature range of -200C to +800C with a single point calibration.

A high resolution Delta-Sigma ADC can serve well for high performance thermal management applications such as industrial or medical instrumentation. Traditionally, RTDs are biased with a constant current source. The voltage drop across the RTD is conditioned using an instrumentation amplifier which requires multiple resistors, capacitors and few operation amplifiers and/or a stand-alone instrumentation amplifier. This analog instrumentation technique requires a low noise and stable system to calibrate and accurately measure temperature. It also requires an operator for optimization on the production floor.

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