On 02/09/2015 08:47 AM, Bruce Perens wrote: > We have a few approaches for precise frequency control. First, there is > a 10 MHz reference input with a signal conditioner chip. If you have a > small GPSDO, you can connect it there. The current sub-1PPM oscillator > is this one: > http://www.conwin.com/datasheets/tx/tx355.pdf >
They quote the total frequency error as 5ppm "Inclusive of calibration @ 25C, frequency vs. change in temperature, change in supply voltage (±5%), load change (±5%), reflow soldering process and 20 years aging, referenced to Fo". That's a really nice spec. Most timing source specs give a ppm per annum ageing figure, but are really vague about what the cumulative effective of years of ageing might be. Regards, Steve ------------------------------------------------------------------------------ Dive into the World of Parallel Programming. The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
