DIY ADC

[Mrosso]

Has anyone tried to make a DIY A/D converter using the Cirrus Logic CDB5381 eval board?

 

[analag]

I guess not, but then again only a specific range of devices are covered here.

 

[Klaus Mogensen]

I mailed Cirrus logic about this (the price) sometime ago, but they didn't answer. Maybe I didn't score high enough in 'how many millions a year does your company sell for' question.
The evaluation boards (at farnell) are also very expensive.

Take a look at Uwe Beis' ADC

http://www.beis.de/Elektronik/ADDA2496/AD2496.html

Best, Klaus

 

[beren]

Thank you for this Link !

 

[analag]

Hey guys, a couple of Bloaks and a pair of Lundahls and we got ourselves a stepped up version of this ADC. If only we could get a wordclock sync on this baby.

 

[Svart]

easy enough. keep looking at the ICs, I've seen some ready made stuff somewhere.

 

[Mrosso]

The cost of the Cirrus Logic eval boards is $360. Newark has them, but there is a min qty. (2 I think) I know some of the Cirrus distributors sell them one at a time for $360.

I e-mailed Uwe Beis electronics and they said that the board they have is not Word Clock ready. The Cirrus board has a clock header. Jim Williams said that he believes it may be possible, although "messy" to get WC into the cirrus eval board.

Anyone have ideas on how to do this?

 

[Klaus Mogensen]

it says that the the connector j13 should be used (Fig. 5). I, however, don't really have the grand overview of this. The board also contains a crystal oscillator (12.288 Mhz, fig. 7.), which is for 48/96/192 kHz (table 2), as you can see.

 

[Mrosso]

The CD5381 boards are $360 and avialable from Newark (min. qty 2) and Nu Horizons Electronics Corp., Melville, NY. Nu Horizons sells the boards individually for $360.

 

[Klaus Mogensen]

Thanks for the tip.

 

[Mrosso]

I received my Cirrus eval board and shipped it out to Jim Williams for upgrade. I expect it back in a couple weeks. Will let you kow how things go.

 

[Klaus Mogensen]

O.K. Good luck with the tweeking and testing. I'd like to know how it turns out.
I just got the cs5361 ADC chip from Farnell yesterday, so I can begin stuffing Uwe's ADC board.
I've therefore decided not to buy the Cirrus evaluation board anyway and save the money to buy the new RME fireface 400 in a couple of months. It seems to fit my homerecording needs perfectly.

 

[Klaus Mogensen]

I finally finished the ADC from Uwe. Here is a picture from the first test.

The board to the left is the ADC, while the board to the right is a XO3 clock I bought fully stuffed from TentLabs.
I haven't been able to make a proper listening test yet, because my M-audio fireware interface doesn't like being externally clocked. So the signal path for the test was:

DIY ADC, Lexicon MP550 reverb DAC, M-audio ADC

In a month, or so I will buy a RME fireface 400 interface and make a better comparison.

I will try to keep this site updated:
http://medlem.jubii.dk/klausdiy/hobbies1.html

BTW, you can buy boards and hard-to-get components by Uwe if you want to build the ADC yourself. In is not much harder than the GSSL.

 

[Svart]

still interested in this..