At 12:42 PM -0700 5/24/08, Randy Leifer wrote: >I applied 5v + ground to the proper pins. Pin 1 left >open. >Results vary from part to part, but within 10kHz of >1MHz.....especially if voltage is dropped to 4.1v. >3.3v output is further off. >I don't know if a load on the output makes a >difference...(load resistor value ? ). >Scope shows a square wave...but not a pretty one. >A 10nf cap across the power pins helps freq stability, >but does nothing to the scope image. > >Is it pointless to attempt to get a good sine wave out >of this? ...or best to get a real sine wave part ? >These I'm guessing, are TTL/CMOS type. > >=Randy=
Randy, Those do sound like old-fashioned TTL oscillators. They will require 5V to run. Expect a frequency error range of about 50 PPM. The easy way to get a sine wave is to add a low pass filter. Something made out of some resistors and capacitors will produce a decent result. You might want to add an amplifier after that. And don't expect good frequency accuracy or phase noise, since these are meant to clock a microprocessor, not provide an accurate frequency reference. -- --David Forbes, Tucson, AZ http://www.cathodecorner.com/ _______________________________________________ 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.