JohnSwenson;207933 Wrote: > As some of you know this is exactly what I have implemented in my > system. I have a home built DAC, the low jitter clock is in the DAC and > feeds the SB3 as well, tapping in where the crystal usually goes. The > I2S signals that go to the DAC chip are then tapped and fed to the DAC > where they are reclocked by the main clock and sent to the DAC chip. > > This works extremely well, the jitter on the clock pin of DAC chip is > extremely low.
Sounds great. I'm sorry I don't know about system. Which DAC chip and supporting components are you using? How do you perform this reclocking? Given your DAC chip uses a master clock input, I assume it's a sigma delta one. Parallel DACs (R-2R ladder) are a different animal, they need only bitclock and wordclock, in addition of sdata, of course. And my understanding is that in all cases, for the DAC chip, only the wordclock is of crucial importance, jitterwise. Although I must admit I don't know exactly if and how some jitter on the master clock input of sigma-delta's can alter the audio quality. I'm confident your system is doing very well, but I'm not sure it would be worse if the super clocks were located close to the SB3 Xilinx, given the possible simplification of cabling and circuitry. For this reason, I prefer to integrate the DAC and the SB3 in close vicinity, inside the same case, making irrelevant the question of the super clock location (yet keeping it were Slimdevices designed it), and allowing for a simple, short and direct I2S interconnection. As a matter of fact, I have only one superclock, at 12.2896 MHz for 44.1 CDs, keeping the original crystal for the 48 KHz material. Given it's mostly a lossy one, the regular crystal is good enough (and it's not bad at all!). JLM -- jlmatrat ------------------------------------------------------------------------ jlmatrat's Profile: http://forums.slimdevices.com/member.php?userid=10656 View this thread: http://forums.slimdevices.com/showthread.php?t=35642 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
