Question

What is the resolution of a sting DAC if the reference voltage is 10V and the number of input bits is 3?

(a) 1.25V

(b) 1.75V

(c) 1.23V

(d) 0.25V

I had been asked this question during an interview.

My doubt stems from Data Conversion topic in portion Digital Communication Techniques of Avionics

Answer 1

Correct answer is (a) 1.25V

The best I can explain: Resolution = reference voltage / 2^N = 10/2^3 = 1.25V.