Analog to Digital Converter (**ADC**) is used to convert an analog signal to a digital signal. The input voltage range of the converter is divided into **R** of the same intervals. This is the so-called converter resolution. At the output of the converter we get a value that determines in which voltage range the input is. The output value is expressed in binary system, as a sequence of bits (digits 0 or 1). If we have an **n** bit converter, then its resolution is equal to **R = 2 ^{n}**.

Below we have an 8-bit converter measuring voltages in the range of 0V ÷ 5.12V. The input voltage is converted to one of 256 (0÷255) discrete values.