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04/24/07 22:06
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 		 #137897 - support droids didn't notice that ...
Responding to: ???'s previous message
Yes, that's a specification to which the support guys didn't refer me when I inquired. I wonder if there's a specific person one should contact for more detail.

Thanks, Maarten, for pointing this out.

The information is useful, though 200 us is a mite long, if the procedure for switching from one to another input can be managed properly, and if the re-initialization procedure can be kept short, it might be considerably shorter when switching between nearly similar (19.6 MHz <=> 20 <MHz) inputs. It's possible some of those values don't have to be rewritten.

Unfortunately, 200 microseconds is an order of magnitude too long ... <sigh> ... to be useful for what I am doing. Frequency synthesizers don't operate very quickly, as their time constants are designed for stability rather than for quick lock. This type of PLL is not intended for fast acquisition.

too bad ...



List of 31 messages in thread
TopicAuthorDate
two crystals            01/01/70 00:00      
   Crystal connections            01/01/70 00:00      
      wires very very short            01/01/70 00:00      
         Youd be better off with a pair of DIY oscillators            01/01/70 00:00      
            why not use a derivative with a PLL?            01/01/70 00:00      
               What's a PPL?            01/01/70 00:00      
                  Phase Locked Loop            01/01/70 00:00      
                     It's not a very general sort of PLL            01/01/70 00:00      
                        apples and oranges            01/01/70 00:00      
                           Consider why one would want that ...            01/01/70 00:00      
                        PLL lock timing            01/01/70 00:00      
                           support droids didn't notice that ...            01/01/70 00:00      
                              .. err make that "jibe" : -)            01/01/70 00:00      
                     Atmel MCU with PLL?            01/01/70 00:00      
                        sometimes two wants do not jive            01/01/70 00:00      
                        sadly atmel 8051 derivatives dont            01/01/70 00:00      
            Am I right Richard?            01/01/70 00:00      
               What I meant ...            01/01/70 00:00      
   Koosha, we need an answer            01/01/70 00:00      
      What is in my mind...            01/01/70 00:00      
         why a switch ? It will give you all kins of proble            01/01/70 00:00      
         Maybe use a jumper instead of a switch?            01/01/70 00:00      
            better, yes, as good as none no.            01/01/70 00:00      
            it's commonly used.            01/01/70 00:00      
               all the story!            01/01/70 00:00      
                  Capacitor size            01/01/70 00:00      
                  whare is the uC?            01/01/70 00:00      
                     The uC is in the ZIF socket            01/01/70 00:00      
                  not this type of switch, please            01/01/70 00:00      
                  consider ALL the components!            01/01/70 00:00      
   Thank you!            01/01/70 00:00      

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