[sdiy] More AD1866 DAC ?'s

[Magnus Danielson]

From: <jays at aracnet.com>
Subject: Re: [sdiy] More AD1866 DAC ?'s
Date: Wed, 1 Dec 2004 13:29:44 PST
Message-ID: <200412012129.iB1LTidD012772 at jade.spiritone.com>

William,

> It's a 16 bit DAC and you're dealling with 2's complement numbers. So your numbers go from -32768 to +32767.

Meaning...
0x8000 is -32768
0xFFFF is -1
0x0000 is 0
0x7FFF is +32767

Cheers,
Magnus

> Jay S.
> 
> 
> William Berzinskas <WBERZINSKAS at nc.rr.com> wrote :
> 
> > Hey everyone..
> >  
> > I've got this going for the most part..  i'm 
> > running my ad1866 off of my pic..  and generating some signal, and all is 
> > good.. 
> >  
> > ALMOST...
> > When i send values over ~35000, it actually starts 
> > coming back down again..   for instance,  if i make a triangle 
> > wave (just counting up and back), it comes out great if i use 30000 as the high 
> > side..  then if i change it to 60000, the nice pointy triangle looks more 
> > like the letter M..   
> >  
> > HELP!  :-)
> 
>