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Noise target for ADAU1701 (AVDD)

Question asked by AriLunden on Dec 30, 2012
Latest reply on Jan 9, 2013 by BrettG



I understand that less noise is always better. But is there any target level how low the noise in supply pins should be to be 'sure' that it does not degrade the performance?


I assume that the noise in AVDD is the most important to have under control and the noise in IOVDD, PVDD and DVDD does not cause problems so easily. Is that right?


Basically I try to figure out how good filtering I need to create for SMPS powering up ADAU1701 and MCU. It works on 100-150kHz range and creates saw tooth kind of ripple of course.


I'm doing my own investigation also on this and will post some results as I have them.