Hands-On Industrial Internet of Things

Analog to digital

An analog to digital converter (ADC) acts as an interface between the continuous values of the analogue world and the digital numerical values used in a calculation system. An ADC accepts an unknown analogical signal (typically, a voltage) and converts it into a digital word with n bits, representing the ratio between the input voltage and the full scale of the converter.

Generally, ADC converters include, or must be preceded by, a sampling and holding circuit to avoid changes in the input voltage during the conversion operation. The input to output relationship for an ideal three-bit monopolar converter is shown in the following diagram:

Input/output in an ideal 3-bit ADC

The output assumes that the ​​encoded values are ...