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Old 11th December 2007, 10:22 PM   #1
Nanook is offline Nanook  Canada
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Default Analog to digital converters...

Any know of decent quality ones or a schematic for one? Dacs are easy enough (lots of great designs out there), but ADs aren't quite so easy to come across.

any help appreciated as always.

stew
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Old 11th December 2007, 10:24 PM   #2
flshzug is offline flshzug  Antarctica
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what kinda adc ? 2007 spec? Then you need more dsp knowledge than anything.
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Old 11th December 2007, 10:38 PM   #3
flshzug is offline flshzug  Antarctica
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pcm4222 ev-kit should be decent and the first 6 bit modulator adc chip afaik .
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Old 12th December 2007, 02:36 PM   #4
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Here a link to the TI eval kit
http://focus.ti.com/docs/toolsw/fold...cm4222evm.html

Anyone have any suggestions for a kit with more polish to it. I've seen a chinese item on ebay that uses a CS5340. Not as nice as the 4222 specwise though. The CS5341 could probably be substituted from some improvement. Anything that uses a CS5381 out there?

I've seen lots of discussion on DAC's, but not much on ADC's. I'm looking for something I can use to copy my LP's for the day's when I'm too lazy to flip vinyl.
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Old 12th December 2007, 02:57 PM   #5
flshzug is offline flshzug  Antarctica
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i dont know any of those cirrus chips , but they might have switched cap filters inside i would avoid that fact
PCM4222 ev kit:
"Each analog input is buffered by an input circuit employing the OPA1632 fully differential audio amplifier. "

there is some adc discussion on prodigy-pro forums, someone there said this opa1632 has its roots in ADSL world and its blazing.
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Old 12th December 2007, 03:06 PM   #6
flshzug is offline flshzug  Antarctica
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BTW I would be happy that the kit costs only 150Usd , and polish some some stereo 4x10 Led bargraph addition to it , made out of HDSP 4840 for example
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Old 12th December 2007, 03:17 PM   #7
Nisbeth is offline Nisbeth  Denmark
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A little inspiration: http://beis.de/Elektronik/Electronics.html


/U.
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Old 12th December 2007, 03:18 PM   #8
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fishzug - you are absolutely correct. The PCM4222 is very nice and the eval board is a fantastic deal. I have no idea what I'm talking about. I'll be quiet now.

I believe the a few Lynx sound cards also use the PCM4222 (Lynx L22?).
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Old 12th December 2007, 04:00 PM   #9
flshzug is offline flshzug  Antarctica
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this chip is some 1 year old at most afaik . BTW the very first (discrete) D-S audio ADC described by Robert W. Adams and presented in 1985's AES ( I have the paper , pm ) also used 6 bit modulator front end. Oh I also have some 40 segment fully built Ledmeters with calibration and schematic descripture for sale if someone wants some
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Old 12th December 2007, 07:53 PM   #10
Nanook is offline Nanook  Canada
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Default eval boards and such...

well I've got 4 BB pcm 64's I've been saving and most ADCs use a comparator and a DAC internally, so I think I may be able to put something together----or look for the Beringer piece and Hot rod it. Wish A.R.T. still sold the DIO....
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