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Old 5th December 2009, 11:07 AM   #1
pebo is offline pebo  Germany
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Default Looking for a 24 bit USB ADC board

Hi

I am looking for a high quality 24 bit audio USB ADC board or kit. A sample rate >= 96 kHz would be nice. Well, I could use the board of one of these external soundcards but I only need an ADC and the circuit should be low power. Any ideas/suggestions?


Greetings


Peter
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Old 5th December 2009, 01:05 PM   #2
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Preview AD24QS and DA24QS - Audio ADC and DAC, 24 Bit / 192 kHz is the only DIY ADC design I'm aware of. It only outputs SPDIF, but pair that with one of the USB CODECs with SPDIF input and you should have something to work with.

EDIT: Sorry, that wasn't the best link - better is http://www.beis.de/Elektronik/ADDA24QS/ADDA24QS.html

Last edited by TheSeekerr; 5th December 2009 at 01:09 PM.
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Old 7th December 2009, 05:54 PM   #3
pebo is offline pebo  Germany
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Thanks for your reply. The AD board you suggested is thing I was looking for. All I need is a S/PDIF USB converter. I will search the internet.

Peter
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Old 7th December 2009, 11:36 PM   #4
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check this one out
The USB DAC/Receiver
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Old 8th December 2009, 03:15 PM   #5
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hack a soundcard.
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Old 20th December 2009, 04:15 PM   #6
pebo is offline pebo  Germany
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Thanks for your replies.

I think I need a S/PDIF to USB or (even better) a I2S to USB converter. I have searched the net but could not find one. As the circuit should be as small as possible, hacking a soundcard is not an ideal solution. Any other ideas?


Peter
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Old 4th February 2010, 05:57 PM   #7
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Default Here is some info....

Here is a link to my thread a while back on the same subject.
Spdif Input to USB 24 bit

If you have the ADC (it sounds like you do), then the T.I. TAS1020B chip will give you an I2s interface to USB at 24 bit. This is what I am working on, but have not been successful yet. The USB chip requires programming and writing a driver I believe.

The Edirol UA-1D is an out-of-production device that only does 16 bit. Other than that, it is exactly what you are looking for. A simple Spdif-to-USB interface. I searched many hours for a simple device like that for 24 bit, but have concluded that it isn't available. It seems that we will need to build one from the T.I. chip. Oh well, that's the fun part, right?

Hope this helps.

-Brian
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Old 24th November 2010, 01:46 PM   #8
Aschrum is offline Aschrum  Germany
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Hi there,
I have a simular problem pebo has/d. I am looking for a IS to USB Adapter/Converter. In my case 16 bit would be enough.
If I got it right the signal already got converted into digital by the IS radiosystem. On the side the adapter should be attached the signal shall be used with Labview on a computer. Atm it is reconverted to analog an by a ADC once more into digital, which seems to be quite unnecessary.
I am looking forward to your replies.
Greetings,
Andr
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Old 13th April 2013, 01:49 AM   #9
Rixsta is offline Rixsta  United Kingdom
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looking for an 8channel one, the Buffalo is rather expensive!
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Old 13th April 2013, 06:10 AM   #10
qusp is offline qusp  Australia
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this thread is about ADC, not DAC, buffalo is a dac, multichannel dacs are not cheap to build, especially if they require IV conversion, so probably voltage out chips like this from wolfson, crystal semi or AKM would be preferred if you are on a tight budget.

I presume you want this for a digital crossover? the Najda board from Wroclaw Audio Force for example, has a multichannel dac, with onboard output stage, as well as onboard DSP crossover hardware and optionally multichannel analogue or digital domain volume control. heres the development/discussion thread on this forum, but its a professional audio product also. it has 8 analogue output channels, 10 digital output channels and I think a further 6 channel extender interface. it also has onboard multichannel ADC

as for ADC alone though, they are still pretty thin on the ground in DIY, especially with usb output, but I recommend looking at some of the evaluation boards from manufacturers as a nice starting point, such as the PCM4222 one from Ti.
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