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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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