Excellent results, Kees, thanks for the report. No doubt your tight
layout and decoupling did the trick :-)
Kees & Sandy wrote:
> I built up the first production board and all appears well. The SiLabs
> spec for the CMOS part is 10Mhz to 160Mhz. I can easily run the part
> down to 4Mhz and well above 160Mhz. Above 180Mhz the output level
> starts to drop but I still see a nice waveform up to 290Mhz but the
> amplitude has fallen to 500mV p-p. It does not take too much board
> capacitance to bleed off frequencies like that. There does not appear
> to be any "unwanted interaction" between the Microcontroller and Si570
> part although I don't know exactly what that problem was. There is a
> lot of grounding and shielding on that little board and very short
> leads. I'm also running off 2.9V bateries from Austin Summerfest demos
> and may be able to push it further on 3.3V from the regulator.
> Man, that Si570 is one cool part ! I also want to try one of the LVDS
> parts and I have one on the desk ......somewhere. Looked, but all I
> could find were my 4 CMOS parts.
> Now to get some additional parts together. I do not have the
> additional Si570 parts yet for the kits.
> 73 Kees K5BCQ