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In Reply to: RE: Intona USB 2.0 Hi-Speed Isolator for better Oom-Pah! posted by AbeCollins on April 13, 2016 at 15:26:10
Hi !
i have a technical question on the Intona Isolator.
I do not spot any quartz so i was wondering if it also reclocks the usb signal or not.
Because i see around cheaper isolators based on the ADuM4160 chip.
Actually i have one that i am testing.
To be honest i find it particularly convenient to provide external power to the usb port.
This same chip is used also on the Berkeley Audio Alpha USB converter, a very good piece.
Thanks a lot for any advice.
Kind regards,
bg
Follow Ups:
The topic of Intona reclocking came up here a few days ago - see below for a link to Intona's explanation.The now rather elderly ADuM4160 is USB1 only. You need to make sure that that doesn't matter in your context. I used one successfully a few years back but it died on me one day for no apparent reason.
As the ADuM4160 board needs an external PS and the Intona works well with bus power, you should perhaps allow for that when comparing prices.
HTH
D
Edits: 04/18/16
Hi !
thank you very much for your kind and very valuable reply.
Regarding the " ADuM4160 is USB1 only " does this mean reduced speed ?
i am not at all in high-rez ... at max 16/48.
I found the following on the ADuM4160 datasheet ..." Low and full speed data rate: 1.5 Mbps and 12 Mbps "
and actuall i see a jumper on the board positioned for full speed.
And actually i am using a simple board now based on it.
Moreover the fact that " the ADuM4160 board needs an external PS " it is actually a plus for me because i can "inject" cleaner power in the usb cable downstream the isolator.
Main problem would be the introduction of jitter of any nature in the signal.
I do not have a clue about this however.
Thanks a lot again for the very helpful advice.
Kind regards,
bg
Edits: 04/18/16 04/18/16
Regarding the "ADuM4160 is USB1 only" does this mean reduced speed?
If you mean "Is the ADuM4160 (USB1) slower than Intona (USB2)?", the answer is, obviously, "Yes". If you mean "Does it matter that the ADuM4160 is slower than the Intona?", the answer is "In the audio context generally and in your context in particular, almost certainly not" but it does no harm to be aware of possible limitations.
Main problem would be the introduction of jitter of any nature in the signal.
The isolators in both devices inevitably add jitter to the signal though the Intona's re-clocking may well take care of it. (It's not clear from the Intona site how it reclocks.)
I can't say how much a little added jitter matters in the context of sub-48KHz data but my guess would be "Probably not much". Though I haven't compared it (can't meaningfully compare it) with the Intona, I can safely say that the ADuM4160 made the system I was using at the time sound better.
HTH
D
Hi and thanks a lot !
Your words " I can safely say that the ADuM4160 made the system I was using at the time sound better " tell me exactly what i was hoping to hear.
I wanted to know if the chip can have a place in an audio chain.
Now it is connected with a very cheap SMPS but i have another one linear and better available to try out.
Thank you very much again for the precious advice.
Kind regards,
bg
I wanted to know if the chip can have a place in an audio chain.
See link for audio-related details of a suitable product. (There are others.) Search also for ADuM4160 in this forum for lengthy (and sometimes even helpful) discussions on it from five or six years ago.
D
Hi ! thanks for the link.
I am testing the one in the picture
the idea would be to try different power supply (maybe a battery).
Thanks a lot again.
Kind regards,
bg
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