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| How to determine if PLL 4046 is locked? |
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| 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? --- End quote --- 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. --- End quote --- 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. --- End quote --- 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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