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AD7626 CNV signal duty cycle

Question asked by lopez.zoni on Sep 19, 2017
Latest reply on Sep 20, 2017 by Gnib



In the AD7626 datasheet says:


Table 3: CNV High Time has a maximum value of 40ns.

Self Clocked Mode Section: Conversions are initiated by a CNV± pulse. The CNV± pulse must be returned low (tCNVH maximum) for valid operation. 


If I were to have an sampling rate of 10MHz than I have a period of 100ns. I should not use a %50 duty cycle since that will make CNV signal high for 50ns.  So the duty cycle needs to be maximum 40%.


When I examine the Evaluation Module for AD7626, the AD9513 clock OUT 0 is configured to be 50% duty cycle.


This confused me. Can you please explain what I miss here?