
Conversion between digital and analogue
Full scale range, quantisation levels and
resolution
A moment's thought should reveal that, as the analogue
signal always has a maximum value, this in turn must
correspond to a maximum digital value. For example, an
8-bit
converter may be designed so that the maximum
value of the analogue input is limited to +5 V. Then the
lowest digital value (00000000) will logically correspond
to an analogue voltage of 0 V. At the other end of the
scale, the full digital value of 11111111 will correspond
to +5 V. From this one can easily work out the analogue
voltage difference between one digital value and the next ...