Re: Chip like LTC1799

From: John Popelish (jpopelish_at_rica.net)
Date: 02/20/05 

Date: Sat, 19 Feb 2005 22:20:52 -0500

DaveC wrote:
>
> John Popelish <jpopelish@rica.net> wrote in news:4217F489.906C4CA1
> @rica.net:
>
> > DaveC wrote:
> > (snip)
> >>... I'm clocking a
> >> DAC & ADC so need mark/space within 40-60% and frequency between 20kHz
> &
> >> 800kHz
> >
> > Does this mean that any frequency between 20 kHz and 800 kHz will do
> > if the symmetry stays between 40-60%, or must that symmetry hold while
> > the frequency is adjusted, continuously between these limits?
> >
>
> Yes it must hold, The frequency is controlled by the user. It's for a
> guitar pedal. A foot controller is used to adjust the frequency at any
> time. If the 40-60% mark/space is lost then you get really awful pops as
> the ADC drops samples.

Then I think you could rig up the VCO in a CD4046 or HC4046 PLL to do
this. 40 to 1 frequency is a bit large, but if you don't need very
precise limits, unit t0 unit, I think it would work. 

-- 
John Popelish

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