[sdiy] Direct Digital Synthesis (was: integrator / capacitor leakage)

[Aaron Lanterman]

On Tue, 6 Dec 2005, ASSI wrote:

> I don't think these are working directly down to the mHz region, but it
> seems you'd need a DDS (direct digital synthesis) chip given those
> constraints. You still need a processor somewhere to load the control
> words into the DDS chip. Operation down to mHz involves of course
> another mixer... check
>
> http://www.sander-electronic.de/be00005.html
>
> for available IC.

Wow, look at the price on those chips! Seems like major overkill... you 
pay for those megahertz.

Hmm, there's some interesting stuff on National Semiconductor App Note 
263:

http://users.ece.gatech.edu/~lanterma/sdiy/datasheets/notes/sine_wave_generation.pdf

I'm putting together a datasheet collection here (primarily intended for 
use by my students, but if anyone else finds it useful too, that's a happy 
happy thing):

http://users.ece.gatech.edu/~lanterma/sdiy/datasheets

- Aaron

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