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    Question

    When a large number of analog signal is to be converted

    to digital form, an analog multiplexer is used. The best suites analog to digital converter for this operation is ______
    A Successive Approximation type. Correct Answer Incorrect Answer
    B Forward counter Type Correct Answer Incorrect Answer
    C Dual slope type. Correct Answer Incorrect Answer
    D Up-down counter type. Correct Answer Incorrect Answer

    Solution

    When many analog signals are to be digitized, they are first selected one by one using an analog multiplexer. In this case, the ADC should be fast and efficient so that multiple channels can be scanned quickly. The successive approximation type ADC is most suitable because it works on the principle of binary search, provides fixed conversion time, and has high speed which makes it ideal for multiplexed inputs. ●      Forward counter type is slow because conversion time depends on input value. ●      Dual slope type is accurate but too slow for handling multiple channels. ●      Up-down counter type is also slower compared to successive approximation.

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