Hi If you want sine waves with the logic ic's just put Tee filters on the outputs. A simple low Q design will knock the harmonics down > 60 db without messing anything up to much on the IC end.
Bob On Sep 26, 2013, at 9:40 PM, Angus <not.ag...@btinternet.com> wrote: > Hi, > > Square wave outputs can be rather higher maintainance, with the whole > distribution system from the PCB design and layout through all the wiring to > the terminations and beyond all has to be up to the fast IC's/transitions. > 10MHz sine waves are much more forgiving. > Square waves are useful for some things, but I tend to avoid them like the > plague, or immediately turn them to sine, unless I need them. It just depends > what it's wanted for. > > Angus. > > > From: "Bob Camp" > To: "Discussion of precise time and frequency measurement" > Sent: September 27, 2013 12:44 AM > Subject: Re: [time-nuts] Clock Driver Design > > Hi > > Ok, the SN74LVC1G125 is 35 cents each at Mouser if you buy at least 10 > pieces. That's going to be $3.50. LM78L05 is 26.5 cents if you buy 10 pcs. > You will need some bypass caps and resistors, I'd assume you already have > them. > > Say you want 10 channels, that's 11 logic id's. At one IC per output that's > almost $4 plus the 27 cent regulator. Still under $5 for all the parts. It's > roughly $10 if you double up on all the output channels. > > Do a quickie PCB from any of the usual outfits for $10 or so on a small run / > one day turn basis. > > Total cost without connectors or case < $20 in very small quantities. > > Bob > > On Sep 26, 2013, at 5:05 PM, "John C. Westmoreland, P.E." wrote: > >> SN74LVC1G125 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
