Correct Answer - Option 1 : 1010 0000

__Concept:__

A successive-approximation ADC is a type of analog-to-digital converter that converts a continuous analog waveform into a discrete digital representation using a binary search through all possible quantization levels before finally converging upon a digital output for each analog voltage conversion

If V_{in }≥ V_{DAC }⇒ maintain a loaded bit

V_{in }≤ V_{DAC}⇒ clear the loaded bit

**Calculation:**

Given,

Reference voltage V_{R} = 5 V, number of bits n is 8

Resolution \(= \frac{5}{{{2^8} - 1}} \approx 20\ mv\)

**Clock pulse 1:**

1 st clock = 10000000

Output voltage V_{0} = 20 mV × 2^{7} = 2.5 V

As 3.5 V > 2.5 V it maintains the loaded bit

**Clock pulse 2:**

2 nd clock pulse = 11000000

Output voltage V_{0} = 20 mV × (2^{7} + 2^{6}) = 3.75 V

As 3.5V < 3.75 V it clears the loaded bit

**Clock pulse 3:**

So at the end of the 3^{rd} clock pulse output is = (10100000)_{2}