Flash Analog to Digital Converter Circuit Design

The flash analog to digital converter is also known as the simultaneous analog to digital converter. It is one of many methods of converting an analog signal to a binary one. Like each of the other methods of analog to digital conversion, simultaneous or flash conversion has its advantages.


The flash analog to digital converter is not the most widely used method of converting an analog signal to binary bits. However this technique for analog to digital conversion is the fastest.

3 bit flash analog to digital converters change an analog signal to a 3 bit parallel binary output. For example if the analog voltage is 7 volts, the resulting parallel binary output will be binary 110.

The binary code output at any moment in time can be determined by sampling the analog input voltage. If the signal is sampled more frequently, the accuracy of the digital signal output increases.



The flash ADC converter does not rely on a digital to analog converter. It uses op amp comparators and a priority encoder. Although the simultaneous ADC converter only produces a 3 bit parallel binary output, it requires 7 comparators.

The large number of comparators makes the circuit bulky in comparison to some other ADC circuits. This is the reason why some circuit designers do not like it.

Analog to Digital Conversion

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