Analog to digital converters...

Nanook · 11th December 2007, 10:22 PM

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

flshzug · 11th December 2007, 10:24 PM

what kinda adc ? 2007 spec? Then you need more dsp knowledge than anything.

flshzug · 11th December 2007, 10:38 PM

pcm4222 ev-kit should be decent and the first 6 bit modulator adc chip afaik .

whitelabrat · 12th December 2007, 02:36 PM

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.

flshzug · 12th December 2007, 02:57 PM

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.

flshzug · 12th December 2007, 03:06 PM

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

Nisbeth · 12th December 2007, 03:17 PM

A little inspiration: http://beis.de/Elektronik/Electronics.html

/U.

whitelabrat · 12th December 2007, 03:18 PM

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?).

flshzug · 12th December 2007, 04:00 PM

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

Nanook · 12th December 2007, 07:53 PM

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....

11th December 2007, 10:22 PM	#1
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	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 __________________ stew ☮ -"A sane man in an insane world appears insane."

12th December 2007, 07:53 PM	#10
Nanook diyAudio Member Join Date: Feb 2004 Location: Chinook Country.Alberta	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.... __________________ stew ☮ -"A sane man in an insane world appears insane."

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11th December 2007, 10:24 PM	#2
flshzug Banned Join Date: Dec 2007	what kinda adc ? 2007 spec? Then you need more dsp knowledge than anything.

11th December 2007, 10:38 PM	#3
flshzug Banned Join Date: Dec 2007	pcm4222 ev-kit should be decent and the first 6 bit modulator adc chip afaik .

12th December 2007, 02:36 PM	#4
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	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.

12th December 2007, 02:57 PM	#5
flshzug Banned Join Date: Dec 2007	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.

12th December 2007, 03:06 PM	#6
flshzug Banned Join Date: Dec 2007	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

12th December 2007, 03:17 PM	#7
Nisbeth diyAudio Member Join Date: Jan 2001 Location: Denmark	A little inspiration: http://beis.de/Elektronik/Electronics.html /U.

12th December 2007, 03:18 PM	#8
whitelabrat diyAudio Member Join Date: Dec 2006 Location: Maryland	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?).

12th December 2007, 04:00 PM	#9
flshzug Banned Join Date: Dec 2007	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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