Lance,

Currently I building up a surf board for the Analog Devices AD9832 (AD9835).
Prior to this chip I was playing with the Harris HSP45102.  I could operated
the Harris chip all the way up to 10 MHz with the computer, but had
difficulty using the PIC due to 32 and 64 bit data streams.  The AD9832 seem
more friendly to the PIC and also has a built in 10-bit DAC.
I've posted a similar request to the list in the past re:DDS and got no
response.  So, I've been on my own on this project :)

David

-----Original Message-----
>From: Lance Allen <l.allen@AUCKLAND.AC.NZ>
>To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
>Date: Tuesday, May 18, 1999 8:44 PM
>Subject: DDS generation
>
>
>Has anyone here used the DDS method to generate sinewaves with a PIC?
>We used a 16c74 running at 8MHz to generate 1Hz to 2000Hz in 1 Hz
>steps. Great for the original application but now we want to ramp up
>to 20kHz in 1 Hz steps but we just cant squeeze enough for 20kHz out
>of the code (now a 16MHz xtal). Has anyone done this?  Some clues for
>tight code?... please.
>
>