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AD7689 SNR and aperture

Question asked by chaudan on Feb 23, 2017
Latest reply on Feb 23, 2017 by Gnib

Hello,

 

 I try to measure SNR of AD7689, I use a 20Khz sine with 250Khz fs (Ref=4.096V , Vcc=5V), and I am now close from 85db SNR, but it is still far from datasheet (~93db).

 My question is about aperture delay (2.5ns typ), what does it mean compare to acquisition  time (1.8Us min) ? In other words, when INx data is truly stored in capacitor array, in relation with CNV signal ? and so, is any variation of Inx signal captured during acquisition time ?

 

Thanks

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