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Consider the following Analog to Digital Converters: Counter type ADC: A Dual slope ADC: B SAR type ADC: C Flash ADC: D The correct order of conversion time (T) of the ADCs shown above is:

Consider the following Analog to Digital Converters: Counter type ADC: A Dual slope ADC: B SAR type ADC: C Flash ADC: D The correct order of conversion time (T) of the ADCs shown above is: Correct Answer T<sub>D </sub>&lt; T<sub>C</sub>&lt; T<sub>A</sub>&lt; T<sub>B</sub>

For n-bit conversion, the conversion time for different ADC are:

Counter type ADC: (2n – 1) Tclk

Successive approx. time ADC: n Tclk

Flash type ADC: Tclk

Dual slope ADC: (2n+1 – 1) Tclk

The successive approximation A/D converter has a shorter conversion time compared to the counter ramp A/D converter, i.e the correct sequence will be: TD < TC< TA< TB

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  • Counter type ADC and successive approximate ADC uses DAC
  • Counter type ADC uses linear search and successive approximation type ADC uses binary search
  • A ring counter is used in successive approximation type ADC
  • Flash type ADC is fastest ADC
  • Flash type ADC requires no counter
  • For an n-bit ADC, flash type ADC requires (2n – 1) comparators
  • Dual slope ADC is most accurate

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