I have used the 4046 with success but I agree that it may be better to let
it produce a higher frequency and divide it down with, let's say, a 4040
counter. On the counter you may tap out any division ratio.

But again, some 4046:s don't behave right! The Philips for example don't
work for a large frequency ratio (down to zero). I'm using the National or
Motorola 74HC4046 which are ok.

Hans Nielsen

> The biggest
> problem with your design is the very low frequency part.  Getting
> an analog
> VtoF to operate that low would be difficult.  You could try a much larger
> divide ratio and tap out at the appropriate counter output or you could do
> the PLL in software.
>
> Attached is a link to the CD4046 PLL.  They will do a much better job
> explaining its operation.  Yes, many companies are obsoleting it, but look
> at the various 74XXX4046 devices available, then tell me its obsolete.
>
> http://www.fairchildsemi.com/pf/CD/CD4046BC.html
>
> Regards,
> Ed
>
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