[time-nuts] 74HCT9046A Max. Operating Frequency

wb6bnq wb6bnq at cox.net
Tue Apr 29 23:18:17 UTC 2014

Hi Samuel,

I have yet to see where you answered what your reference frequency is 
for the PLL ? ? ? ?

If you are locking a 24.576 MHz oscillator to a common house standard 
like, for example, 10 MHz then you are going to have a comparison 
frequency at 16 KHz.  The reason is Phase Detector #2 has a max 
frequency of around 4 MHz so when you get done looking for an integer 
relationship it is going to be at 16 KHz.  If you are trying to lock 48 
KHz to 10 MHz, it will be the same thing.

Please tell us what reference frequency you are using ?


sg sg wrote:

>Running my PLL design routine again for 48 kHz I realize that this is in fact very advantageous--it greatly reduces the required capacitor size in the loop filter. So dividers are clearly the way to go.
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