Daisy chaining 2 PCM2902's

djd4n · 1st August 2004, 04:08 PM

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.

cheers

Dan Morton

Nisbeth · 1st August 2004, 06:45 PM

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?

/U.

djd4n · 1st August 2004, 07:31 PM

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.

Dan

djd4n · 1st August 2004, 10:32 PM

sorry the picture is at this link

Pic of out board device

dan

mikewu99 · 2nd August 2004, 03:03 AM

You need to add a USB hub, something like this:

http://www.smsc.com/main/catalog/usb2502.html

Attach one PCM2902 to each downstream PHY.

1st August 2004, 04:08 PM	#1
djd4n diyAudio Member Join Date: Aug 2004 Location: Newcastle UK	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. cheers Dan Morton

2nd August 2004, 03:03 AM	#5
mikewu99 diyAudio Member Join Date: Jan 2003 Location: Audubon, PA	You need to add a USB hub, something like this: http://www.smsc.com/main/catalog/usb2502.html Attach one PCM2902 to each downstream PHY. __________________ Mike "Never confuse motion with action." B. Franklin

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1st August 2004, 06:45 PM	#2
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	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? /U.

1st August 2004, 10:32 PM	#4
djd4n diyAudio Member Join Date: Aug 2004 Location: Newcastle UK	sorry the picture is at this link Pic of out board device dan

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