Rpi to Sabaj D5 via I2S

[kchap]

Talking to a Volumio user, I think it's a RPi4. I'm about to suggest using USB but a thought has just occurred to me. Where would the clock come from? I want to be sure I do not say the wrong thing. If the clock originates in the Pi it sort of defeats the purpose of I2S, at least in this context.

 

[kchap]

Just discover the user is using a HAT to convert to S/PDIF / TOS link. It's not a direct connect after all.

 

[phofman]

As of the clocks - that DAC is most likely using its ESS chip in async resampling mode, keeping the master clock by the DAC. Nevertheless no ASRC can 100% eliminate the incoming jitter, by principle.

Clock of the incoming signal:
* USB path - async USB, local clock by the XMOS FPGA
* I2S - most likely slave mode, i.e. clock by the I2S transmitter -> very jittery RPi clock
* SPDIF - clock by the SPDIF transmitter. Either the HAT has its own clock, slaving the I2S RPi transmitter, or the I2S transmitter master -> the jittery RPi clock.