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Old 8th May 2010, 02:28 PM   #101
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@audiodesign : What bout DAC End. Can it be connected to ? Any modification need to do ?
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Old 8th May 2010, 02:29 PM   #102
regal is offline regal  United States
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Quote:
Originally Posted by audiodesign View Post
What you think about the use of an Quad-Channel Digital Isolator on output like this one ?

ADUM1400 | Quad-Channel Digital Isolator (4/0 Channel Directionality) | Digital Isolators | Interface | Analog Devices

High data rate: dc to 90 Mbps

or the more common ISO150

Interface - Isolators - ISO150 - TI.com

used in some Burr Brown evaluation board
I think the Hiface need 480 Mbps.
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Old 8th May 2010, 02:45 PM   #103
EUVL is offline EUVL  Europe
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480Mbps at I2S outputs for 192kHz ??

Patrick
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Old 8th May 2010, 02:52 PM   #104
regal is offline regal  United States
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Quote:
Originally Posted by EUVL View Post
480Mbps at I2S outputs for 192kHz ??

Patrick
The way Ayre did it was isolate at the usb side I think its to late to do at the I2S side.
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Old 8th May 2010, 03:00 PM   #105
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erwincantona,
DAC End use a 18bit 44KHz DAC chip so you can use a more simple USB->SPDIF like in the Cheap system 3
Cheap hi-end system
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Old 8th May 2010, 03:07 PM   #106
EUVL is offline EUVL  Europe
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Why is it too late to isolate at the I2S side ?

You can argue that you don't want the noise from the PC to go to the Hiface.
Then you only need 1 isolator at high speed (USB2).

But wouldn't you find it more important to isolate the Hiface (which operates at HF) from the DAC ?
In that case you need 4 channel lower speed, as suggested.


Patrick
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Old 8th May 2010, 03:14 PM   #107
agent.5 is offline agent.5  United States
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I take one.

Quote:
Originally Posted by erwincantona View Post

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Old 8th May 2010, 03:23 PM   #108
qusp is offline qusp  Australia
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wow these are flying out the door!! but absolutely would be great to find an isolator solution as GB not just because of the group buying power, but also because we have a hive-mind here all focused for the one purpose. I take it 4 x murata SMD traffos would be no good? like used for spdif isolation

Last edited by qusp; 8th May 2010 at 03:27 PM.
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Old 8th May 2010, 03:25 PM   #109
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Quote:
Originally Posted by regal View Post
I think the Hiface need 480 Mbps.
480 Mbps is the specification of the bus itself, not the Hiface. Just because a road is limited to e.g. 70mph, doesn't mean you have to driver that fast!

I measured 3-4 Mbps at 24 bit 44.1KHz. I'll try to do a measurement at 192KHZ in the next few days.

Last edited by Spartacus; 8th May 2010 at 03:35 PM.
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Old 8th May 2010, 03:30 PM   #110
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I think we need someone to test one of these ....

USB Interfaces « Circuits@Home

If it's satisfactory for our purposes, we could contact the maker for a GB.
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