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-   -   High-Speed Digital Isolators? (http://www.diyaudio.com/forums/digital-source/92573-high-speed-digital-isolators.html)

Ryssen 20th December 2006 04:08 PM

High-Speed Digital Isolators?
 
http://focus.ti.com/docs/prod/folders/print/iso721.html
Are they doing the same job as a transformer on the S/PDIF?Eccept they have a buffer,are they any good?:)

Dag 20th December 2006 06:34 PM

No, but I think it is possible to use it to isolate the S/PDIF interface.
It is a digital circuit with a recommenden 0.7*Vcc/0.3*Vcc(MOS) 2V/0.8V(TTL) input voltage. But the hysteresis is 150mV so you might be able to drive it with the S/PDIF signal and a "correct" DC level BUT I DO NOT RECOMMEND IT because it is VERY sensitive. Better is to use a comparator or something at the input to get a digital signal for the "iso".
The eay diagram jitter is specified to a few ns at 100Mbps. I have no idea how much jitter the "iso" will add to a S/PDIF signal. (A good S/PDIF signal should have a few hundred ps jitter....or less :)

D

Ryssen 20th December 2006 07:42 PM

Quote:

BUT I DO NOT RECOMMEND IT because it is VERY sensitive. Better is to use a comparator or something at the input to get a digital signal for the "iso".
Ok,good to know.:)


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