OK, I didn't know about the Si570 using RAM, was going to dig the data sheet out later. The Cypress CY22393 used in the "Peppermint" demo board part is troublesome though, EEPROM only.
Yes I'm referring to "wear" on EEPROMs. You will not wear problems with Dave WB6DHW's SDR kit or a properly designed Si570 LO subsystem; now that Dave has set me straight on the Si570 using RAM. --- In [email protected], [EMAIL PROTECTED] wrote: > > On 31 Mar 2008 at 11:10, Jarmo Blomster wrote: > > > > > > > Using DDS for the VFO is optimal at the moment. Yes there are spurs, > > but the phase noise is good and you can tune them as often as you want > > without worrying about wearing out limited flash memory in parts like > > the Si570 which is so popular with the Softrock SDR's. Perhaps this > > flash memory issue is one reason why the designer of the Elektor board > > compromised with the Cypress Semi part. > > > The Si570 uses RAM. It returns to the default frequency after power is lost. It should not > have the problem of wearing out flash memory. The Si570 is a pretty new part, I don't think it > was available when the Elektor board was designed. > > Dave - WB6DHW > <http://wb6dhw.com> >
