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Which of the following analog to digital converter (ADC) does not use a DAC?

Which of the following analog to digital converter (ADC) does not use a DAC? Correct Answer Single slope ADC

Concept:

Counter type ADC:

  • DC voltage is proportional to digital output.
  • The maximum conversion time depends on a number of bits.

Successive approximation ADC:

  • It uses the binary search algorithm.
  • Conversion time doesn’t depend on input magnitude.
  • It is suitable for serial communication.

Dual slope ADC and Single slope ADC:

  • These reduce design complexity and improves measurement quality.
  • In dual slope and single slope ADCs instead of using a DAC with a ramped output, we use an op-amp circuit called integrator to generate a sawtooth wave.
  • These are used in the precision application.

Eg: Multimeters and instruments

Dual slope ADC

The counter will be ON while discharging

Principle:

1. Charging time (T1) → VC ∝ | Vin |

2. Discharging time (T2) → count goes down VC to zero

Digital Ramp ADC:

  • At the start, the counter is cleared to 0.
  • As the counter counts up with each clock, the DAC outputs a slightly higher voltage. This voltage is compared with the input voltage by a comparator.
So we can conclude that Dual slope and Single slope, Multi slope ADCs don’t require DAC in their construction.

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