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A flash ADC, or flash analog-to-digital converter, uses a parallel architecture with multiple comparators to convert an analog signal into a digital output in a single step. It employs a resistor ladder network to generate reference voltage levels, allowing it to compare the input voltage against these levels simultaneously. This design enables extremely fast conversion times, making flash ADCs suitable for high-speed applications, though they can be limited by power consumption and complexity as the number of bits increases.

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