DDS (generating sine waves) with onboard DAC using latest PIC 16F chips?

[HankMcSpank]

Not quite relevant, but for the DAC that was discussed before, for the new PIC 1782/3, it needs 10usec for each sample to output a DC voltage. So it will reach about 390Hz maximum

Yeah, after my initial excitement ....while that's still a potentially very cool new PIC, a 28 pin solution seems excessive for a simple PIC DDS proposal!

Re going with HPWM.... alas, that would need someone who knows a whole more about filters than myself!

I'm obviously still not grasping something quite fundamental here (talk about being slow or what?!), cos this guy gets a lovely smooth 8 bit sinewave @ 8.9khz - and using a sampling (interrupt) rate of only 100khz .....

http://www.g4jnt.com/PIC_DDS.pdf (albeit he's LP filtering the PIC output & hasn't shown whether the prefiltered R2R ladder is ugly or otherwise)