Other Parts Discussed in Thread: PCM2912
I built a prototype board with the PCM2912A. Works beautifully. One thing I noticed though was the coupling of the 1KHz USB packet frame (and its harmonics) to the Analog Mic signal.
Could this be mitigated simply by putting a ferrite between AGND pin of the chip and my GND plane (I have a single GND plane that all circuitry connects to, and my analog and digital sections are isolated), or is this considered common mode noise on the USB that needs a common mode choke.
Thank you.