Is your work area grounded to the soldering iron tip. If not the tip can generate a discharge. Though as someone commented unlikely. The fact that 2 are bad does point to a miscount on the pins potentially.
My trick on one offs as most of my projects are and at the old hand solder limit is a piece of pc board flip the chips over and dead bug the critters. The pc board makes a nice ground plane. I use small rigid coax for various interconnects... Its a task but seems to work well and the ICs and things do work with stability. Though have never dealt with a 40-300 pin package. Generally in the 10 pin count range. Regards Paul WB8TSL On Sat, Jan 22, 2011 at 11:49 AM, Richard (Rick) Karlquist < rich...@karlquist.com> wrote: > > > On 1/22/2011 6:04 AM, Michael Baker wrote: > > I have a need for a 110 MHz VCXO in a 1.8GHz to 7.5GHz >> tracking generator I am building for my Tek 494 spectrum >> analyzer. I bought a pair of Silicon Labs 110 MHz VCXO >> chips for less than $25 for the pair from Cramer >> Distributors. The Si595 VCXO chips are in an >> "industry standard" 5mm X 7mm surface-mount package. >> > > These so called "VCXOs" are not VCXO's. They are just > synthesizers that functionally emulate a VCXO. The phase > noise and jitter are poor as compared to a real VCXO, > such as a CTS 357L ($8 at Digikey). > > Maybe they will work in your application anyway, just don't > kid yourself about what you are getting. > > Rick Karlquist N6RK > > > _______________________________________________ > 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.
