Analog to Digital Converter

A circuit that converts an analog signal, having a continuously varying amplitude, to a digitally quantized representation using binary output signals. The sampling frequency must be at least twice as high as the highest frequency present in the signal to prevent aliasing errors.

Delta-Sigma Modulating ADC

A high-accuracy circuit that samples at a higher rate and lower resolution than is needed and pushes the quantization noise above the frequency range of interest. This out-of-band noise is typically removed by digital filters.

Integrating ADC

An ADC whose output code represents the average value of the input voltage over a given time interval.

See also: Anti-Aliasing Filter, Data Acquisition, Digital-to-Analogue Converter, Quantization Error, Sampling Frequency.