reference design modern prtd sensors and delta sigma adcs

Posted on Feb 6, 2014

This article explains how platinum resistance temperature detectors (PRTDs) can perform measurements over wide temperature ranges of -200 °C to +850 °C, with absolute accuracy and repeatability better than ±0. 3 °C, when used with modern processors capable of resolving nonlinear mathematical equation quickly and cost effectively. This article is the second installment of a

reference design modern prtd sensors and delta sigma adcs
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series on PRTDs. For the first installment, please read application note 4875, High-Accuracy Temperature Measurements Call for Platinum Resistance Temperature Detectors (PRTDs) and Precision Delta-Sigma ADCs.  This article explains how to achieve high-performance precision, wide-range temperature measurement for platinum resistance temperature detectors (PRTDs), using a data-acquisition system (DAS) comprised of a delta-sigma analog-to-digital converter (ADC) and a modern processor. This DAS offers high performance, yet is cost effective. The development DAS presented here resolves design and mathematical challenges quickly and achieves precision temperature measurement in the PRTD`s maximum range (-200 °C to +850 °C). Platinum resistance temperature detectors, or PRTDs, are absolute temperature-sensing devices that can assure repeatable measurements over temperature ranges of -200 °C to +850 °C. Platinum, moreover, is very stable and not affected by corrosion or oxidation. PRTDs thus provide optimal performance for precision industrial and medical applications that require precise temperature measurements. 1 PRTDs are nearly linear devices. Depending on the temperature range and other criteria, you can make a linear approximation by calculating the PRTD resistance change over a temperature range of -20 °C to +100 °C. 1 For a wider temperature range (-200 °C to +850 °C) and for higher accuracy, however, the...

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