The basic building blocks of a DAC are:-
i) A resistive n/w, digital controlled electronic switches, a voltage ref, and I to V converter is a digital i/p code is applied to the resistance n/w the digitally controlled switches.
ii)The digitally controlled swithces are turned on or off by the digital i/p bits(o's and 1's)
iii) The o/p of the resistive n/w is in the form of current. IT can be converted into the proportional voltage with the help of the current to voltage converter.
Depending on the type of resistive n/w used, we have different types of A to D converter lets
. Binary weighted resistor DAC
. R-2R ladder type DAC.