ADS4449: ADS4449：Uncertainty of the Aperture Delay Value

Hi there:

Now we're designing a system which is of strict-requiring of synchronous ADC sampling, with 3 ADS4449 (total 12 channels.)

The system requires a channel-to-channel sampling skew within ±100ps, but as the ADS4449 datasheet says:

The variation of aperture delay among channel of the same chip is ±70ps, and the value among chips increases to ±150ps.

[Thinking of another ADC chips, where the nominal aperture delay is just a typical value (like 360ps of ADC12DJ3200) ,which is different with ADS4449]

So, we wonder if there is a more definite range of the ADS4449 aperture delay value between channels of the same or different chip (as we can't affirm if the ±150ps is a right or an over-announced value), thus we can estimate the feasibility of using ADS4449 in our system.

Thank you & looking forward to your reply!