Title :
High-resolution noise-rejecting ADC
Author :
Woodward, Andrew T. ; Bateson, Simon W.
Author_Institution :
Fac. of Inf. & Eng. Syst., Leeds Metropolitan Univ., UK
fDate :
6/1/1995 12:00:00 AM
Abstract :
A design is presented in which a 24-bit sigma-delta ADC (analogue-digital converter) is combined with an Intel 8032 supervising microcontroller and a tuned zero-crossing detector to give a relatively simple and economical circuit that adapts to local line supply frequencies to maintain very high levels (>150 dB) of interference rejection. The design is particularly applicable to industrial sensors, including thermocouples, load cells, ion-selective and pH electrodes, and chromatographic detectors.<>
Keywords :
chromatography; electrodes; electron device noise; interference suppression; microcontrollers; pH measurement; sensors; sigma-delta modulation; thermocouples; 150 dB; 24 bit; 24-bit sigma-delta analogue-digital converter; Intel 8032 supervising microcontroller; chromatographic detectors; high-resolution noise-rejecting ADC; industrial sensors; interference rejection; ion-selective electrodes; load cells; local line supply frequencies; pH electrodes; thermocouples; tuned zero-crossing detector; Chromatography; Detectors; Electrodes; Interference suppression; Microcontrollers; Sigma-delta modulation; Thermoelectric devices;
Journal_Title :
Computing & Control Engineering Journal
DOI :
10.1049/cce:19950303
