Hi all,

I need to build a small test device that can generate, among other=20
things, pulses of specific frequencies.  And I'd like to control this=20
digitally (from a central PIC).  Specs would be basic 0-5V pulses, freq=20
from about 1Hz to 500Hz (higher is fine as I can divide with some=20
gates), and resolution of about 1Hz across the full range.  1% accuracy=20
should be fine.  And I need to be able to change frequencies very=20
quickly (say at least 20 times a second).

Any recommendations on chips that can do this easily?  Yes I can use a=20
PIC for this, but I just need a few of these and would rather just get=20
something off the shelf.

So far I've found the DS1077, but at a quick glance, I have to give it a=20
divisor rather than a frequency and in the low range of divisors it=20
seems I may not get good resolution.  IE: changing divisor from 2 to 3=20
would mean a 50% change in frequency.

Cheers,
-Neil.

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