EMRFD Message Archive 6747

Message	Date	From	Subject
6747	2011-10-17 08:15:21	Tim	CS2100 synthesizer chip
A one chip fractional-N synthesizer with on-chip digital PLL: http://cirrus.com/en/pubs/proDatasheet/CS2100-OTP_F2.pdf Don't have any inkling how it looks phase-noise wise. Is this pretty much the same technology in, say, an Si570? Tim.
6748	2011-10-17 09:44:20	JOHN GREUSEL	Re: CS2100 synthesizer chip
Tim, I'm no expert but that doesn't look much like a SI570 at all. It looks to me like you can hook an external crystal (or intermittent signal) and create a multiple of that as a stable output in a pretty limited frequency range. The SI570 requires no external clock signal looks like Pavarotti by comparison- from a range standpoint. If the price was right I'm sure there could be some applications for the CS2100. John KC9OJV ________________________________
6750	2011-10-17 19:40:47	ehydra	Re: CS2100 synthesizer chip
The differences for the CS2xxx are: - better to solder by hand - still high, but lower resolution than Si57x - can be phase-locked to external low-frequency signal - expensive too - lower max. frequency - phase noise considerable worsen In principle it looks like similar technique. The Si57x includes the high-frequency quartz, here the CS2xxx have an input. The Si57x does not have the low-frequency input. - Henry Tim schrieb: > A one chip fractional-N synthesizer with on-chip digital PLL: > > http://cirrus.com/en/pubs/proDatasheet/CS2100-OTP_F2.pdf > > Don't have any inkling how it looks phase-noise wise. > > Is this pretty much the same technology in, say, an Si570? > -- ehydra.dyndns.info
6751	2011-10-17 19:41:18	cbayona	Re: CS2100 synthesizer chip
Not quite; 1. The SI570 has a built in reference, this part does not. 2. This part has an average 70ps jitter, the SI570 .3 ps jitter Phase noise wise it's way worse. At 10:15 AM 10/17/2011, you wrote: >A one chip fractional-N synthesizer with on-chip digital PLL: > >http://cirrus.com/en/pubs/proDatasheet/CS2100-OTP_F2.pdf > >Don't have any inkling how it looks phase-noise wise. > >Is this pretty much the same technology in, say, an Si570? > >Tim. > > > >------------------------------------ > >Yahoo! Groups Links > > > Cecil k5nwa Never take life seriously. Nobody gets out alive anyway. [Non-text portions of this message have been removed]