High-Speed Digital Isolators?

Ryssen · 20th December 2006, 04:08 PM

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.

20th December 2006, 04:08 PM	#1
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	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? __________________ Regards Åke

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20th December 2006, 06:34 PM	#2
Dag diyAudio Member Join Date: Feb 2005 Location: Goteborg	No, but I think it is possible to use it to isolate the S/PDIF interface. It is a digital circuit with a recommenden 0.7Vcc/0.3Vcc(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