Neil,

http://romanblack.com/onesec/High_Acc_Timing.htm#decfreq

Cheers

Ravi

> Hi all,
>
> I need to build a small test device that can generate, among other
> things, pulses of specific frequencies.  And I'd like to control this
> digitally (from a central PIC).  Specs would be basic 0-5V pulses, freq
> from about 1Hz to 500Hz (higher is fine as I can divide with some
> gates), and resolution of about 1Hz across the full range.  1% accuracy
> should be fine.  And I need to be able to change frequencies very
> quickly (say at least 20 times a second).
>
> Any recommendations on chips that can do this easily?  Yes I can use a
> PIC for this, but I just need a few of these and would rather just get
> something off the shelf.
>
> So far I've found the DS1077, but at a quick glance, I have to give it a
> divisor rather than a frequency and in the low range of divisors it
> seems I may not get good resolution.  IE: changing divisor from 2 to 3
> would mean a 50% change in frequency.
>
> Cheers,
> -Neil.
>

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