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RE: Absolute Sound on Auralic Vega PLL

I thought it clear what I wrote. It is certainly possible to use the SABRE chips in a way that they require accurate clocks, but if the ASRC is used correctly they will lock on to inaccurate sample rates. The on-chip SPDIF receiver logic will still have some limits on signal jitter, measured well into the nanoseconds, because there has to be an open eye pattern. It is certainly possible to botch a design and get terrible signal integrity.

I'm not surprised that DIYers have trouble making the chip work. Apparently even some manufacturers have this problem as well. (I am talking about making it work, not sound good. That's another question entirely, because of the 100 Mhz clock circuitry involved.)

I know how these decoders work. I've designed and implemented them in the past, albeit at much lower signaling rates and clock speeds. But you're right: the SABRE chip documentation is somewhat cryptic. I assume you read and understood the white paper and also the various patents. Were I to design a product around this chip the first thing I would do would be to play with the chip on a bread board and discover how it really works. This is a huge PITA. Back in the day I was designing circuits and software to decode comms data I had access to the actual logic diagrams of the hardware and additional details, such as clock tolerances. I don't DIY, because I was used to working with a fully equiped hardware lab and access to all documentation. But I can see that people will run into problems if they get over their head.




Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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