Clocking requirement: Which ADC architecture typically requires no conversion clock because timing or iterative sequencing is unnecessary?

Introduction / Context:
ADC architectures vary in whether they need a conversion clock. Some rely on iterative or oversampling sequences driven by clocks, while others operate combinationally. Understanding these differences helps in system timing design and clock-domain planning.

Given Data / Assumptions:

• Flash ADCs perform all comparisons in parallel via comparator arrays.
• SAR and dual-slope ADCs require sequencing and thus a clock.
• “Bipolar” is not an ADC architecture; “actuator” is not an ADC at all.

Concept / Approach:
Flash ADCs use a resistor ladder to create many reference thresholds and simultaneously compare the input to all thresholds. The resulting thermometer code is encoded to binary. Because there is no step-by-step search or integration period, a conversion clock is not required for the conversion itself (though clocks may be used for output latching or system interfacing).

Step-by-Step Solution:

Verification / Alternative check:
Review timing diagrams: SAR shows multiple comparison cycles per sample; dual-slope shows integrate and deintegrate phases. Flash shows a static comparison path with optional latch timing only.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing the presence of output latches or interface clocks with the conversion mechanism; assuming “fast” always means “clocked.”

Final Answer:
Flash