74HC4046 help required.

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Article #16347

#16347

From: Mark Robinson (JO PhD)
Date: Tue, 05 Jan 1993 13:16

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Hi all.

If anyone has a datasheet for the 74HC4046 PLL chip handy would
you let me know how the frequency of the VCO is related to the
values of R's and C and the max/min values that they can take.

I want to run it with a lock range of about 1MHz, centred on
8MHz, but the equations in the Maplin catalogue don't allow
frequencies >2.8MHz (R=5k, C=50pF; ie the minimum allowed) even
though they claim the VCO can get up to 15MHz. I think their
data must be for the 4046 and none of our databooks are modern
enough to include the 'HC4046 :-(

Thanks
Mark
mark-r@spec0.ee.man.ac.uk

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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!bnr.co.uk!uknet!mucs!spec0.ee.man.ac.uk
From: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: 74HC4046 help required.
Message-ID: <7116@m1.cs.man.ac.uk>
Date: 5 Jan 93 13:16:43 GMT
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Organization: Dept Electrical and Electronic Eng, Manchester University, UK
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