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AD9864 settling time

Category: Hardware
Product Number: ad9864

It appears possible to pipeline readings through the AD9864 signal chain,  the next symbol can be presented to the input a couple of frames before the present reading starts to change as a result. From tests it appears to take around 11 frame periods to settle to the new value.  I am not au fait with digital filters,  is there a way of determining the minimum number of frames per symbol assuming instantaneous input change and qualifying settling to (say) 3lsb?.  Perhaps this is not documented because it is a standard formula for the filter chain, tabulated somewhere? (if so where?).  

Is there an Analog Devices simulation package one should use to explore this?, it seems odd that it is not (AFAICT) included in the data sheet.

Thanks

Ian