PIC + DDS = Frequency Synthesizer?

RussT · 2004-01-02T00:15:14+00:00

I asked a friend to post to this forum about desinging a PIC-basedPWM. Now that I have joined this forum, I'll get more specific aboutmy requirements. Thanks by the way for all your interesting andinformative responses.What I am trying to do is make a frequency synthesizer that willoutput 1Hz to say 40kHz in 1Hz resolution. I need to input via akeypad, and have an LCD display show me the inputted frequency. I knowvirtually zero about assembly language! I am presently programmingPICs with PicBasic Pro. That's the first hurdle - if I can eitherprogram this in BASIC or cut-n-paste assembly code in areas that needfast excecutuion then that's fine.I have seen examples whereby one can make a PIC act like an NumericalControlled Oscillator (NCO), and one gets a cheap DDS. Cost is anissue, so the cheaper and simpler the better. I do not mind using 2 xPICs for the interface and control. The output frequency need only bestable to +/-0.1 Hz.I am totally new to DDS (Analog Device IC's, etc.) so that is hurdle#2.I would appreciate any information you can offer. I apologize inadvance if I ask some basic questions! Thanks kindly! Russ >:)