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Old 20th December 2006, 04:08 PM   #1
Ryssen is offline Ryssen  Sweden
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Default 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?
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Old 20th December 2006, 06:34 PM   #2
Dag is offline Dag  Sweden
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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

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Old 20th December 2006, 07:42 PM   #3
Ryssen is offline Ryssen  Sweden
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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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