Resolving very small temperature differences with a delta-sigma ADC
Derek Redmayne
Abstract
The use of the LTC2402, a 2-channel 24-bit, No Latency Delta-Sigma analog-to-digital converter, to resolve very small temperature differences is described.
Keywords
Analog-to-digital converter
platimum RTD
LTC2402
The LTC2402, a 2-channel 24-bit, No Latency Delta-Sigma ADC, is well-suited to differential temperature sensing using a number of different sensors. Extremely good matching between channels allows two absolute temperature measurements to be compared in order to determine the differential or gradient between two points. In the circuits shown below, the LTC2402, with averaging, can resolve a temperature differential of a few ...
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