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An 8-bit successive approximation A-to-D converter is driven by a 2 MHz clock. Its conversion time is
1. 18 μs
2. 16 μs
3. 8 μs
4. 4 μs

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Best answer
Correct Answer - Option 4 : 4 μs

Concept:

The conversion time of different types of ADC is shown :

Type of ADC

No. of Clocks

Time

Counter Type

2n-1

2n-1 Tclk

SAR

n

nTclk

Flash

1

Tclk

Dual Slope

2n+1

2n+1 Tclk

 

 

From the above table, it is clear that the dual-slope is the slowest ADC and Flash Type is the fastest ADC.

Calculation:

Number of bits (n) = 8

Frequency (f) = 2 MHz

Time period, \(T = \frac{1}{f} = \frac{1}{{2 \times {{10}^6}}} = 0.5\;\mu s\)

Conversion time (Tconv) = nT = 8 × 0.5 μs

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