Question

If the resolution of digital to analog converter is approximately 0.4% of its full scale range then it is .... Bit converter

Answer 1

Changing that from 5V to 2.5V gives a resolution of 2.5/256, or 9.7mV. However, the maximum voltage that can be measured is now 2.5V instead of 5V. The only way to increase resolution without reducing the range is to use an ADC with more bits. A 10-bit ADC has 210, or 1,024 possible output codes.
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Answer 2

Answer:

8 bit

Explanation:

Resolution is the ratio of step size and full scale output.

I.e., 100 / (2^n - 1) = 0.04.

On solving, it is 2^n = 251.

So, the best possible value of n is 8.