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Old 13th August 2009, 05:16 AM   #1
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Default Spdif Input to USB 24 bit

Hello,

I have a great 24/96 ADC box with coaxial Spdif and AES/EBU outputs. I would like to make a Spdif to USB interface to handle stereo 24 bit audio into my laptop. Here are the chips I would like to use: TI DIR9001 for converting Spdif to I2S, and TI TAS1020B for streaming I2S to USB.

http://focus.ti.com/docs/prod/folder...t/dir9001.html
http://focus.ti.com/docs/prod/folder.../tas1020b.html

The reason for doing this is to have a simple interface without buying an interface with more features than I need. Am I correct in believing that these both will handle 24 bit audio? Any input on implementing this is welcome, as well as other ideas or warnings !

thanks,
Brian
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Old 23rd August 2009, 06:40 AM   #2
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Default Spdif Input to USB 24 bit

Just looking to find out if this idea is doable before I start it. Is there no one out there who can confirm this, or should I get a schematic going before asking these questions?

thanks,
Brian
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Old 23rd August 2009, 08:34 PM   #3
berni8k is offline berni8k  Slovenia
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Well those look very advanced "USB Streaming Controllers" so im guessing they could do it but i have no idea how to use one of those.

I saw the other one can output 4 I2S streams. I would love if it could act as a 5.1 USB sound card for use in my amp. But sadly i have no idea how these things even work.

Hope someone knows how to use these.
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Old 23rd August 2009, 09:41 PM   #4
H3nry is offline H3nry  United States
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My guess is these will handle the job. You know you will have to write firmware for the USB interface. It is an 8052 microcontroller at heart. It will have to initialize both chips, communicate with your laptop that it's a standard audio input, and handshake data packets via USB protocols. I'm sure T.I. has a library of code functions you can draw from, but it's not a simple matter of putting a couple of chips on a PC board and running wires.
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Old 23rd August 2009, 09:45 PM   #5
berni8k is offline berni8k  Slovenia
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Yeah they are programmable thats why i asked if anyone knows how to use them. From a quick look around i didn't find any software examples or anything
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Old 24th August 2009, 02:36 PM   #6
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TI has a free SDK for the chips that you can download. Check out the device pages on their web site.
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Old 28th August 2009, 09:44 PM   #7
dangus is offline dangus  Canada
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If your laptop has a PC Card (PCMCIA) slot, it might be worth checking if there's any off-the-shelf cards that provide S/PDIF in.

I found the Digigram VXpocket on eBay... not exactly cheap, though.
And the Audigy 2 ZS Notebook, which appears to have S/PDIF in and out.
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