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ADAU1701: change to low sampling frequency for LF signal processing

Question asked by BerndS on Feb 7, 2012
Latest reply on Feb 7, 2012 by BrettG

Hi all,


i'd like to reduce the sampling frequency of the ADAU1701 to have more processing power for low frequency signal processing.

So if i reduce to e.g. 16kHz sampling frequency via 'Set system sampling rate' (see attached picture) and/or 'Propagate sampling rate', the ADC sampling rate should also be reduced. But if i measure the amplitude response (analog in > no processing > analog out), there is no difference in the amplitude response when configured to 48kHz !?

As a test i got a 10kHz analog signal at the input and have this also at the output (sampling = 48kHz). Now i set the sampling rate to 16kHz and the 10kHz signal appears stable at the output (after pressing 'Link Compile Download). How can this be ?