AD7654: Analog Input - CONVST goes low

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Accepted Answer

Question Regarding the AD7654, how long does the analog input have to be stable for,
 after taking CoNVST low? I imagine it is a short time. Answer The AD7654 incorporates a sample and hold circuit at the input.
 
 There is no requirement for the input to be stable when convst goes low. Convst 
 will "freeze" the analog input voltage approximately 2ns after CONVST goes low. 
 This is specified as the aperture delay. If convst is a perfectly periodic 
 signal (i.e. no jitter), the the sampling instant will have a jitter of 
 typically 5ps rms.

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AD7654: FAQ