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Old 9th August 2012, 09:59 AM   #21
pdcaceo is offline pdcaceo  Hong Kong
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Join Date: Jun 2004
Location: HK
Are there any jitter improvment if WM8804 apply a low jitter clock ( for example Tentlab 3ps crystal)to them.

Or still keep 50ps performance without help.
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Old 9th August 2012, 05:37 PM   #22
twest820 is offline twest820
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Join Date: Jun 2009
I think you probably meant ~62ps performance; see post 17 in this thread. Measured WM880x baseband phase noise is an order of magnitude higher than that of a typical crystal driver so diminishing returns most likely apply---it seems reasonable to assume Wolfson did a decent job on the driver so the PLL is probably dominant source of baseband jitter. If so, then there's negligible benefit for spending the extra dollar to go to from a crystal to a Fox XPresso XO---the improvement over something like a TXC 9C crystal would be somewhere around going from 126dB to 127dB DnR. In the rather unlikely case the DAC's good enough it matters. I haven't seen phase noise measurements of the Tent oscillators (though in fairness I haven't looked very hard) but the XPressos are competitive with Vectron XOs costing 20 times as much so they're probably competitive with the Tents as well.

Last edited by twest820; 9th August 2012 at 05:39 PM.
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