[Coco] new high density controller
gene.heskett at verizon.net
Thu Aug 10 09:55:32 EDT 2006
On Thursday 10 August 2006 09:22, Mike Pepe wrote:
>jdaggett at gate.net wrote:
>> The integrator ( filter) circuit on the PUMP pin, which by the way is
>> an output, is there to filter the error pulses generated by the phase
>> detector of the VCO system. You need to only have one value for this
>> filter. The widest step in frequency would determine the cutoff
>> frequency of the integrator. In the case of SD to HD would be the
>> frequency difference between 125Kb/Sec to 500Kb/Sec data stream.
>I trust your judgment, though the data sheet for the chip does specify
>two values. I was working on using a relay to switch them. (ugh)
Nah, use a cmos analog switch, a piece of a 4066, when turned on tight, is
less than 100 ohms (60ish IIRC) and pretty bylateral. If you don't need
it for anything else, use all 6 of them in that chip in parallel. Many
times more dependable than a mechanical contact.
>I may just have to try it and see if I can get the 2793 to work.
People having trouble with vz bouncing email to me should add the word
'online' between the 'verizon', and the dot which bypasses vz's
stupid bounce rules. I do use spamassassin too. :-)
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