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How to determine if PLL 4046 is locked?
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Benta:
This might seem like a total overkill, but there aren't that many PFDs and VCOs out there. These ON Semi parts will do the job:
MCK12140
MC100EL1648

They're not cheap (appr. 5 € each). Upside is, they're relatively easy to design with, as ECL technology does not send major switching spikes onto the supply lines.

Finding PLL/VCO parts in the 1<100 MHz range is hard. BTW, ON Semi specifies max. operating frequency as 1.9 MHz for 4046, 3 MHz for 74HC4046.




Zero999:
I was thinking of something like this. It may need buffering to give a nice square wave, which could be done with the spare gates in the quad NOR gate IC, used for the lock detector.

https://www.electronics-notes.com/articles/radio/pll-phase-locked-loop/voltage-controlled-oscillator-vco-design-for-plls.php
T3sl4co1l:
Not really necessary to go to an LC oscillator.  RC is perfectly reasonable at this range, you just need something that's not HC slow.

Might look for V-to-F converters, or anything using a comparator for the same purpose.  MCP6562 and the like should be fast enough, or there's always faster types out there.  (Or LM319 if you're feeling... rustic?)

Tim
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