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AD7701 data sheet step response clarfication


I am trying to negotiate the data sheet for the AD7701 converter.  The question I have is about the step response of the ADC outlined on page 10 of the data sheet. 

As indicated by the data, if I have a 4Mhz clock the worst case settle time output of the Gaussian filter would be 125ms on a large step input.  So how would I interpret the Gaussian filter settle time of a 1Mhz clock input?  Would it be 4x of the example or 500ms?



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