Electronics > Beginners
How to determine if PLL 4046 is locked?
ZeroResistance:
--- Quote from: Benta on August 14, 2018, 08:30:29 pm ---
--- Quote from: ZeroResistance on August 14, 2018, 07:34:12 pm ---So for a high frequency verson (5Mhz to 15Mhz) of the CD4046 what would be better?
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Neither the CD4046 nor the 74HC types will work well at those frequencies. I think you need to take a step back and rethink this project.
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74HC4046 datasheet says that VCO center frequency @ Vcc 6.0V is min 13Mhz typ 21Mhz ? Am I missing something here?
Benta:
Didn't say it wouldn't work, just that it won't work well. At those frequencies, the VCO output will not look like a square wave. And the PD will have issues.
ZeroResistance:
--- Quote from: Benta on August 15, 2018, 06:14:05 am ---Didn't say it wouldn't work, just that it won't work well. At those frequencies, the VCO output will not look like a square wave. And the PD will have issues.
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Ok, then what do you suggest, is there a chip that will work well at those frequencies?
iMo:
The most recent variant is the 74HC9046 with improved params.
The only way how to verify it works fine at 5-15MHz is to wire it and measure..
Zero999:
--- Quote from: ZeroResistance on August 15, 2018, 06:23:32 am ---
--- Quote from: Benta on August 15, 2018, 06:14:05 am ---Didn't say it wouldn't work, just that it won't work well. At those frequencies, the VCO output will not look like a square wave. And the PD will have issues.
--- End quote ---
Ok, then what do you suggest, is there a chip that will work well at those frequencies?
--- End quote ---
An LC oscillator with a varactor?
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