In the touch the S/PDIF stream is reclocked by a low jitter flop fed directly from the main clocks. The SB3 has the stream coming directly from the FPGA. That almost certainly gives lower jitter on the touch output.
The SB3 has some EMI suppression devices on the output which messed up the impedance characteristics significantly increasing reflections on the cable, thus increasing jitter in the receiver of the DAC. The touch does not have these. Both the touch and the SB3 have a separate "connector board" which is only a two layer board. Maintaining proper impedance of the traces when going from the multilayer main board to the double sided board was not done very well on the SB3, it seems to have been done much better on the touch. So all in all the touch has a very well done S/PDIF output with a fair amount of effort put into preserving low jitter on its way to the DAC. Its not using expensive parts or any special "magic bullet", just honest good design and implementation with attention to the details. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=67649 _______________________________________________ Touch mailing list Touch@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/touch
