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What is the main function of (D/A) or DAC converter?

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What is the main function of (D/A) or DAC converter?

(a) Converts Digital to Analog Signal

(b) Converts Analog to Digital signal

(c) All of the mentioned

(d) None of the mentioned

The question was asked in my homework.

The above asked question is from Sample and Hold topic in division Sampling and Reconstruction of Signals of Digital Signal Processing

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The correct choice is (a) Converts Digital to Analog Signal

To explain I would say: A digital-to-analog (D/A) converter (DAC) takes a digital sequence and produces at its output a voltage or current proportional to the size of the digital word applied to its input.

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