regarding it the dac should be asyncronous or native.
This is review of 11 usb dacs done by a norwegian magazine.
It showed thet the asyncronous dacs (in this test) had the highest level og jitter.
(it is run through google translate some technical words are not translates)
Jitterstøy = jitter noise
Jittermåling = jitter measuremet
But all still far below audibility !