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Re: Frequency measurement of a very short pulse

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How does the signal look like exactly?

There seems to be no detailed specifications on the signal form in order to be counted correctly (rising/falling time, minimum time to stay at a level (H, L), overshots, ...).

As the internal clock of the device is 100MHz, the decive can handle signals with 5ns H/L time, at least internally. But as generation is limited to 25MHz, it is possible that it is limited to 20ns....

 

In reality, i would expect the device to be somewhere in between these two numbers if the signal is "perfect" TTL/CMOS signal.

 

Norbert


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