VCOs & Tempco

[Duane R Balvage]

Hello -
> I was thinking about this approach not too long ago. It sounds great
> especially if you're using a small microncontroller, but what's the
> resolution on the digitally-controlled resistor?

  Probably 7-8 bits. I had a Prophet-5 that encoded all pots at 7 bits, 

  and it worked pretty good.

> How many bits do you
> really need for an EG?

  again, probably 7-8 bits. The SixTrak I have encodes the EG's in 4
bits,

  but I find this to be a bit "clunky"....

> If you were to do this entirely digitally, could you
> use a cheapo DAC like a resistor ladder?

  Probably, but WHY?? You can get DAC0800's for practically nothing
nowadays...

> How many bits could you get away
> with? I wouldn't think the sampling rate for an EG wouldn't have to be very
> high, either.


  Nah - they get away with a REALLY slow rate on my sixtrak ...

				- Hope this helps -

					- Duane

-- 
   "That boy's got a mouth like a cannon ... Always shootin' it off..."
                                
                             - Foghorn Leghorn
                      ________________________________
                     / o o oo              o ooo o   /\
       -------------/ ////  Duane R. Balvage   //// / /---------
                   /    _________________________  / /
                  / // / // /// // /// // /// / / / /
                 /___ //////////////////////////_/ /
                 \____\________________________\_\/

                     Intel Corporation, RA1-303
                   Portland Technology Development
       =========================================================

              Phone: (503) 613-8055    FAX: (503) 613-8261
                   E-Mail: dbalvage at ptdcs2.intel.com