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How many discrete voltage levels are used for 8 inputs DAC?

How many discrete voltage levels are used for 8 inputs DAC? Correct Answer 256

Correct answer is 'option (4)' = 256

Concept:

For an 'n' bit DAC the number of discrete voltage levels will be 2n.​

​Calculation:

Given, n = 8

Hence, the number of discrete voltage levels = 2n = 256.

Mistake Points

  • For an 'n' bit DAC the number of discrete voltage levels will be 2n  but the numbers of steps will be (2n-1).
  • Example: In the above problem there are 256 different  discrete voltage level but there are only 255 steps between the 0-V level and the full-scale voltage. ​

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