Midi to CV -> ZN426 DAC ?

[Tony Clark]

> I want to finally make up the Elektor/Doepfer midi to cv project.  It
> specifies a ZN426 DAC that is apparently made by Ferranti and QEC
> Plessey.  I have so far been unable to locate a data sheet on the DAC.
> Is there another you guys might recommend that is more readily
> available?  The ZN426 apparently has an onboard voltage reference
> but needs a negative voltage supply and an external op amp to
> achieve 0-5V range.  I've found cheap 8 bit DACs (not pin compatible)
> that can get the voltage range but need the voltage reference.  I
> imagine there are solutions from Maxim etc. that have on board
> reference and the range, I just don't want to use a $8+ part.
> 
> Or is there a popular 8051 variant that has a DAC output?

   Do you have to stick to any specific DAC?  I just received information 
from Texas Instrument about a new 10-bit D/A converter that is 
specifically made for 0-5V output.  All you have to do is supply a 2.5V 
reference and away you go.  This is easy to do with an LM336-2.5V.  DAC 
cost?  Around 3.50 I'm told.  I've supposedly got some samples coming.  
Should be fun to muck around with.  Don't have the P/N for it right now, 
email me and I'll mail it to you.  Or post it...

   Tony

-------------------------------
I can't drive (my Moog) 55!
-------------------------------
Tony Clark -- clark at andrews.edu 
http://www.andrews.edu/~clark
-------------------------------