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Old 1st August 2004, 04:08 PM   #1
djd4n is offline djd4n  United Kingdom
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Question Daisy chaining 2 PCM2902's

How would i go about daisy chaining two PCM2902's on a PCB, so as they only use one USB connection? is this possible?

I know u can daisy chain upto 127 USB devices, i'm thinking of more of a hard wired solution, if u get what i mean.

Basically i want to end up with 2 PCM2902's in a box, giving me 2 stereo in's and 2 stereo out's, but using only one USB connection.


Dan Morton
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Old 1st August 2004, 06:45 PM   #2
Nisbeth is offline Nisbeth  Denmark
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If you run off to the local library and take out the december 2002 issue of Elektor, you'll find a small circuit with the PCM2902. It has analog in/out as well as toslink SPDIF inputs/outputs (could be modified to be coax quite easily). If you need more than one analog input/output a simple switch should do the trick. What exactly are you trying to build?

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Old 1st August 2004, 07:31 PM   #3
djd4n is offline djd4n  United Kingdom
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I would like to build an external USB device, which will enable me to input 2 separate stereo analogue signals into my computer, manipulate them on my computer, with plugins etc. then output the manipulated signals again separately on 2 stereo analog outputs.

See attached picture.

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File Type: jpg usb.jpg (10.9 KB, 78 views)
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Old 1st August 2004, 10:32 PM   #4
djd4n is offline djd4n  United Kingdom
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sorry the picture is at this link

Pic of out board device

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Old 2nd August 2004, 03:03 AM   #5
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You need to add a USB hub, something like this:


Attach one PCM2902 to each downstream PHY.
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