Hi Bob, Do you know of a good source for a 500 MHz low jitter clock oscillator? All I have contacted have a minimun quantity order in the hundreds figure. I have the AD9958 qsitting quietly waiting for a clock source. I wish other companies would be experimenter friendly like Analog Devices is.
Other day I've contacted Cirrus Logic in the US for a sample of an ADC chip and since I am in Japan, they directed me to their Japanese subsidiary. The guys here did not even want to talk to me if I do not provide a company name, project name, project description and estimate for a the number of units (int thousands) to enter the market. I've told them to go to hell... :-( Regards, -- Edson, pu1jte, n1vtn, 7n4ncl --- In [email protected], Robert McGwier <[EMAIL PROTECTED]> wrote: > > I like the AD9958/9959. Even with smaller D/A and accumulator, it has > BETTER spur and noise floor than other models. A higher frequency clock > (500 MHz) is required to get there but several companies make good ones. > > > http://www.analog.com/en/prod/0,2877,AD9958,00.html > > http://www.analog.com/en/prod/0,2877,AD9959,00.html > > > Their ap engineers say these are improvements over the AD9951/9954 even > though we they have smaller depth D/A's. The product notes seem to > support this. The accumulator is smaller than the accumulator for the > AD9854! > > 73's > Bob > N4HY > > > KD5NWA wrote: > > How clean that clock is extremely important, and a DDS source is not > > very clean specially some 10 bit ones. > > > > You might want to do a little searching on Google, each different AD > > DDS chips have their own pattern of frequencies where the spurs are > > at a minimum. One of the things the SDR-1000 does to keep spurs down > > is to move the clock to only clean frequencies. These frequencies can > > be mathematically determined according to a formula so a simple > > program or calculator can figure out your clean frequencies. > > > > > > > -- > AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, > NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman > Laziness is the number one inspiration for ingenuity. Guilty as charged! > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/soft_radio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
