Analog to Digital Converter

An analog-to-digital converter (commonly abbreviated as ADC, A/D or A to D) is a device which converts continuous signals to discrete digital numbers. In general, an ADC is an electronic device basically employed for transforming an input analog voltage or current in to a digital number proportional to the magnitude of the voltage or current.
An analog signal is continuous in time and it is required to convert this to a flow of digital values. For that reason it is essential to define the rate at which new digital values are sampled from the analog signal. The rate of new values is called the sampling rate or sampling frequency of the converter.

Analog to Digital Converter - Continued