resolution, numerical (of an analog-to-digital converter or a digital-to-analog converter)

The number (n) of digits in the chosen numbering system necessary to express the total number of steps.

NOTE 1 The numbering system is normally a binary or a decimal system.

NOTE 2 In the binary-coded-decimal numbering system, the term "2 digit" refers to an additional decimal digit with the highest positional value, but limited to the decimal figures "0" or "1" as it is represented by only a single bit. This additional digit serves to double the range of values covered by the other "n" digits.

References: 

JESD99B, 5/07