The difference between analog voltage represented by two adjacent digital codes of an analog to digital converter is

Resolution: It is defined as the smallest change in the analog output voltage corresponding to a change of one bit in the digital output.

The percentage resolution (%R) of an n-bit DAC is:

\(\%R = \frac{1}{{{2^n} - 1}} \times 100\)

The resolution of an n-bit DAC with a range of output voltage from 0 to V is given by:

\(R = \frac{V}{{{2^n} - 1}}volts\)

Hence the difference between analog voltage represented by two adjacent digital codes of an analog to digital converter is called resolution.

Hence option (2) is the correct answer.

Important Points

Accuracy:

• The accuracy of the A/D converter determines how close the actual digital output is to the theoretically expected digital output for given analog input.
• In other words, the accuracy of the converter determines how many bits in the digital output code represent useful information about the input signal.

% Accuracy of a n bit ADC = (1 / 2n ) × 100