Terry,
The device seems to be re-clocking on the DAC side, not sure if it feeds the timing back over the isolation though.
Danny,
As you are probably aware, sending the clock back through isolators is required for the reclocking to
work properly and everything to be synchronous. That's one thing I always look for. Also the clock
selection (44.1 / 48 multiples) hi/lo sig needs to be sent through isolators. It's all pretty complex to
do correctly.
I can see that it uses an LC574A (D flop-flops) that looks like it's clocked with the oscillators on the isolated side to output the signals.
Two oscillators I can see there (isolated side), I think one for PCM stuff and the other for DSD maybe.
http://www.datasheetdir.com/LC574A+download
One oscillator for 44.1 / 88.2 / 176.4 (and DSD) etc one for 48 / 96 / 192 etc.
It will be interesting to play with the L & R DSD streams, supposedly DSD is just decoded by some LPF setup. Maybe this can be somehow discretely implemented.
I had a look at this board and some of the feedback from users at DIYA. It seems that even though he claims
to have implemented re clocking, it is still very susceptible to cables, source etc etc. I'm guessing the
implementation is just not up to scratch.
I think best way is to implement the whole reclocking isolation scenario as a separate board. More work.
For the money it's worth having a play with though.
T