Hello,
I can't find any CMRR/PSRR rejection for the PCM1795 DAC chip and I was wondering what is the worst acceptable power supply AC noise & ripple for the +3.3V and +5V voltages, peak-to-peak or RMS, measured directly on DAC chips.
I've seen good power supplies with decent specs but quite bad PCB that increases ripple and noise a lot. Measuring with a scope directly on PCM1795 pins (or nearby capacitors) for the +5V and +3.3V might give to end user/customer an idea about how good is PSU and PCB of the final DAC unit.
I've also seen USB powered DACs that have good specs, but sound is a bit grainy and ripple+noise on DAC pins was between 1-4mV, depending on the DAC unit.
So, an answer for "What's max. acceptable ripple+noise for +3.3V and for +5V rails, so PCM1795 could handle the final PCM & DSD sound without changing it's output specs at all?" would be really appreciated.
Thank you very much for your time!
Kind regards,
Raul.
