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ESE Electronics 2012 Paper 2: Official Paper

Option 4 : Successive approximation type

CT 1: Ratio and Proportion

2672

10 Questions
16 Marks
30 Mins

The conversion time of successive approximation type ADC is n T_{clk}.

Where n is the number of bits and T_{clk} is the clock period.

1 T_{clk} is used for the start of the conversion signal and 1 T_{clk} is used for the end of the conversion signal.

Here n = 12

So total conversion time

\(\begin{array}{*{20}{c}} { = 12 \times 1\;\mu sec + \;}\\ {} \end{array}\begin{array}{*{20}{c}} {1\mu \sec + \;}\\ {\left( {EOC} \right)} \end{array}\begin{array}{*{20}{c}} {1\;\mu sec}\\ {\left( {SOC} \right)} \end{array}\)

= 14 μsec