The word length possible with an analogue-to-digital converter
determines its resolution. With a word length of n bits the maximum, or
full scale, analogue input VFS is divided into 2 n pieces. The minimum
change in input that can be detected, i.e. the resolution, is thus VFS /2".
With an analogue-to-digital converter having a word length of 10 bits
and the maximum analogue signal input range 10 V, then the maximum
analogue voltage is divided into 2 ~~ = 1024 pieces and the resolution is
10/1024 = 9.8 mV.