GATE 2021 EC – Question 30
An 8-bit unipolar (all analog output values are positive) digital-to-analog converter (DAC) has a full-scale voltage range from 0 V to 7.68 V. If the digital input code is 10010110 (the leftmost bit is MSB), then the analog output voltage of the DAC (rounded off to one decimal place) is ________ V.
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Correct answer: 4.48 to 4.52
Explanation
The code $10010110_2=150$. With $2^8=256$ steps, the step size is $\frac{7.68}{256}=0.03$ V, so $V_{out}=150\times0.03=4.5$ V.