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An 8 bit unipolar successive approximation register type ADC is used to convert 3.5V to digital equal output. The reference voltage is +5V. The output of ADC at end of 3rd clock pulse after the start of conversion is .......... .
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- 1010 0000
- 1000 0000
- 0000 0001
- 0000 0011
Correct Option: A
8 bit successive approximation register type ADC
Reference voltage = +5V
If MSB = 1 → 2.5 volt
Vi > 2.5 volt (yes) MSB = 1
If next bit = 1 → 2.5 + 1.25
= 3.75 volt
Vi > 3.75 volt (no) Bit = 0
If next bit = 1 → 2.5 + 0 + 0.625 = 3.125 volt
Vi > 3.125 volt (yes) Bit = 1
Output of ADC at the end of 3rd clock pulse = 1010 0000
