[sdiy] DAC for MIDI2CV

[Paul Maddox]

Seb,

> I am back to the design of my MIDI2CV converter, and the thing that is
causing me the most trouble is finding the right DAC for not too much money.
I want at least 14bit +-1LSB, but 16bit would also be fine and they seem
much more common.  I want to add things like pitch bend, and have LFOs in
software, so high resolution is important.
>

> But, I'm having real trouble in UK finding a reasonably priced one (e.g.
<£20) which has low integral linearity error.  Having spent a lot of time
looking through datasheets, it seems accurate DACs designed for control
applications are generally expensive (it also needs to settle reasonably
fast because it's running 16 CV outs).
>

Take a look here ;-
http://www.modulus.wavesynth.com/projects/avr_projects.htm

Theres a polyphonic one , 4 channel, that can be switched to Monophonic if
needed.
Uses a 16bit serial DAC available as a sample (read: FREE) from Analog
Devices.
Source code and schematics are on the page.


If you want to do your own, check out Maxim, they do a rather sexy 32Channel
DAC with built in S&Hs, its surface mount mind you, but I plan on useing
some in my polysynth.

Paul
--------------------------------------------------------------
Modulus Electronics Home page ;-
   http://www.Modulus.wavesynth.com

PPG Home page ;-
  http://www.PPG.wavesynth.com