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AD1939 antialiasing and reconstruction filter at low sampling rates not working?

Question asked by rocketscience on Aug 18, 2016
Latest reply on Aug 26, 2016 by DaveThib

Hi there.

 

Were using the AD1939 at low sampling rates (8 - 24k) and get measurement results that show that the AAF and/or reconstruction filters are not working properly. Are these filters engaged at all sampling rates? What clock determines their cutoff frequencies? In the datasheet they're just specified for 48/96/182k.

Thanks for an answer,

 

Christian Frick

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