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Q#1 Data Converters GATE EE 2015 MCQ +2 marks -0.66 marks

An 8-bit, unipolar successive approximation register type ADC is used to convert 3.5V to digital equivalent output. The reference voltage is +5V. The output of the ADC, at the end of 3rd clock pulse after the start of conversion, is

1010 0000

1000 0000

0000 0001

0000 0011

Explanation:

Resolution =

Output after 1st clock pulse = (10000000)2 = (128)10 

Voltage equivalent

, so next bit will be set in the next clock cycle.

Output after 2nd clock pulse = (11000000)2 = (192)10 

Voltage equivalent

, so this bit is reset and next bit will be set.

Therefore, output after 3rd clock pulse = (10100000)2

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