Device identification: The ADC0804 is a classic example of a successive-approximation (SAR) analog-to-digital converter. Determine whether this identification is accurate.

Difficulty: Easy

Correct Answer: Correct

Explanation:


Introduction / Context:
The ADC0804 family is widely cited in textbooks and labs as an 8-bit SAR ADC used for learning and simple data-acquisition tasks. This question checks familiarity with common ADC device types.


Given Data / Assumptions:

  • ADC0804 resolution: 8 bits.
  • Architecture: successive-approximation using an internal DAC and comparator.
  • Typical interfaces: simple parallel data outputs and start/ready control signals.


Concept / Approach:
SAR ADCs operate by iteratively comparing the input with a DAC-generated voltage, halving the search space each step until the N-bit code is resolved. ADC0804 implements exactly this procedure internally, which is why it is used in introductory mixed-signal experiments.


Step-by-Step Solution:
Recall the device family and datasheet classification.Match the described behavior (binary search via DAC + comparator) to SAR principles.Confirm: ADC0804 is a SAR ADC.


Verification / Alternative check:
Reference schematics show timing for start-of-conversion and end-of-conversion that align with SAR sequences, not integrating or delta-sigma methods.


Why Other Options Are Wrong:
Clock source and Vref details do not alter the converter architecture. Resolution is fixed at 8 bits, not 10.


Common Pitfalls:
Confusing ADC0804 (SAR) with integrating devices such as dual-slope ADCs used in DMMs.


Final Answer:
Correct

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