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Old 8th November 2006, 01:40 PM   #1
lucpes is offline lucpes  Europe
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Default Firewire or USB device for tapping I2s

I'm thinking into buying an external soundcard to have a 'clean' I2s source for a DAC of my choice:

USB: M-Audio transit, people have used it to tap i2s - price around USD80. Needs a power mod to feed it from an external supply instead of the USB 5V.

Uses TAS1020A, then i2S to a cheap DAC, should be real easy to build a clean supply/add a low jitter 6mHz clock...

Firewire: Behringer FCA202, external power, firewire interface. More prone to changes I'd say, but I haven't heard of anyone using it for this purpose. What does it have inside?

What would be the pro/cons of using either?
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Old 8th November 2006, 05:44 PM   #2
lucpes is offline lucpes  Europe
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Here I am replying to myself, here's a nice paper on the subject:

http://www.oxsemi.com/oxford/whitepa...oTests_Web.pdf

Abstract would be that Firewire has more bandwith and is less prone to errors than USB.

Now, of course it's dependant on supplies quality, clocks, implementation, but I'm really tempted to go with Firewire.
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