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Old 19th March 2007, 06:34 PM   #1
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Default DIY ADC info ?

I have searched the threads and am coming up short.
Does anyone know of a good DIY design or kit for an ADC? I have found plenty of data on DACs, but data on an ADC seems sparse.
I need something to feed a DSP.

Thanks,
Steve
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Old 20th March 2007, 07:45 AM   #2
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How about a Cirrus Logic evaluation board ? It shouldn't be too hard to get one.
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Old 20th March 2007, 08:01 AM   #3
Werner is offline Werner  Europe
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One possible way could be to buy an ADC evaluation board from TI or AD, add suitable power supplies, and adapt the analogue front-end to your needs.

I've got a board for the PCM4202, but haven't got the time yet to play with it.
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Old 20th March 2007, 02:27 PM   #4
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Good suggestions. I can probably get an EVAL board from Cirrus. I have an in there. wink But eval boards are usually larger and have more components on them then necessary for just the base functionality. I am trying to find something more compact and purpose built. If any one else has any suggestions I am still listening. If all else fails, I will go the eval route.

Thanks,
Steve
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Old 20th March 2007, 10:27 PM   #5
Nisbeth is offline Nisbeth  Denmark
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The only real DIY ADC I'm aware of: http://www.beis.de/Elektronik/ADDA2496/ADDA2496.html


/U.
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Old 20th March 2007, 10:55 PM   #6
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Old 21st March 2007, 12:52 AM   #7
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Thanks for your suggestions. It looks like either of the DIY projects could be made to suit my needs. I may be able to get a freebie CDB5381 from Cirrus but if not the price for this board at Digi-Key is $360!! That's a non-starter.
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Old 21st March 2007, 05:15 AM   #8
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You can try something like this. Use 0.22uF or larger capacitors to couple to the inputs. I forget exactly, takes something like 0.5Vrms input for full scale.

Click the image to open in full size.

I use "Audacity" software for recording. The chip also plays back with DAC outputs. Or create and SPDIF signal to connect to another DAC. Very layout sensitive.

jh
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Old 21st March 2007, 06:33 AM   #9
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Thanks for that post Jim. If I could use spdif it would probably do the trick but I need something with LJ or I2S out. I'm still looking and won't make a decision until I think I have done enough homework. I'm really amazed that there are a million DAC's out there but precious few resources for a DIY ADC.
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Old 21st March 2007, 07:30 AM   #10
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Quote:
Originally posted by audiosteve
Thanks for that post Jim. If I could use spdif it would probably do the trick but I need something with LJ or I2S out. I'm still looking and won't make a decision until I think I have done enough homework. I'm really amazed that there are a million DAC's out there but precious few resources for a DIY ADC.
Have you considered designing one ?
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