Key advantage of the successive-approximation ADC (SAR) Consider common ADC architectures (flash, SAR, sigma–delta, pipeline). Evaluate the statement: “The key advantage of a successive-approximation ADC is its conversion speed.” Choose the most accurate assessment.

Introduction / Context:
Analog-to-digital converters come in multiple architectures, each with trade-offs. Successive-approximation register (SAR) ADCs are widely used in microcontrollers and data-acquisition systems because they offer a compelling balance of speed, resolution, power, and cost. Understanding their primary advantage clarifies when to choose SAR over other types.

Given Data / Assumptions:

• We compare general characteristics: flash (very fast, low resolution/costly), SAR (moderate-to-high speed, mid-to-high resolution), sigma–delta (very high resolution, lower bandwidth), dual-slope/integrating (excellent noise rejection, slow).
• “Key advantage” refers to the main selling point across typical use-cases.

Concept / Approach:
SAR ADCs complete conversion in N clock steps for N bits, yielding deterministic and relatively fast conversion with modest hardware. They are significantly faster than integrating (dual-slope) converters and often faster than sigma–delta for moderate bandwidths, while being far less complex/costly than full flash or high-speed pipeline converters. Hence, speed (with good resolution) is a primary advantage within their target space.

Step-by-Step Solution:

Verification / Alternative check:
Survey datasheets: SAR ADCs commonly achieve hundreds of kS/s to multi-MS/s with 10–18 bits—evidence of strong speed/resolution balance.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing “fastest overall” (flash) with “key advantage in practical midrange designs” (SAR).

Final Answer:
Correct