ADC based on AK5394

This project is based on SDR-Widget, original project from here with little hw modifications and clean the firmware, get rid of unnecessary code, leave only the USB-I2S code.

Complete PCB

noise floor FS 48kHz

noise floor FS 48kHz with 100 averages

REW with 1M and infinite average, 93.75% overlap.

And measurements with excellent Victor 1KHz  LDO.

The last build, without case.

PS. 50Hz spikes are to the fact that board are on the bench, not in the case.

PS2. Unfortunately AK5394 is obsolete, there are also good ADC from AKM but not with an flat bandwidth and low noise floor till ~90KHz.