When the resolution of a
specific
ADC is infinite, it is called an ideal ADC. In other words, the resolution of an ideal
ADC is equal to its Effective Number of Bits (ENOB). In an ideal ADC, every possible analog
input value
provides
a unique digital output from the ADC within the specified conversion range. It is
considered
as
a theoretical concept
that
cannot be realized. An ideal ADC can be described mathematically
using
a linear transfer function, as shown in
the
following graphical
illustrations.
Figure 1. Single Ended Ideal ADC
Figure 2. Differential Ideal ADC