Programming si5351 with the PyBoard

Datasheet for the si5351

Adafruits development board

A link to my github repo that has the si5351 library

[johnsonstechworld]

Came here when I was trying to learn about LMR SDR! 73 Jon, VU2JO

[NeedleBender]

Great instructional video!!! I am actually building a 20m rig using some of the code. I was able to add a correction factor to the code so the frequency is spot on. However i was testing it using the original code and anything above 11mhz there looks like an error causing the frequency to be 5mhz off. Once I track down the error I’ll be able to have an awesome VCO.!!!

[stevew]

Very interesting
keep up the good work

[generalingwer]

Nice video.i wandering have you seen a very significant negative temp.coefficient within the 5351 boards.

[HitAndMissLab]

Great video!
Just two questions:
- Can this board be made to output frequency in 1 Hz increments?
- can the phase difference between the two channels be made to be any other value except quadrature? Like, can it be any arbitrary angle?

[jungsuhong]

Thanks for your kind explanation,
can this board generate below 180 kHz (25MHz X15/2050)? i think it stucks with a limitation under the python adafruit software

[natewelch]

Interesting! When setting the PLL using the fractional method you didn't seem to get any jitter on the clock signal. The 5351a boards that I have been playing around with have some pretty noticeable jitter on the signal unless I use the even integer mode of setting up the part.

[davidegiuffrida]

Stupid question....I can program and it hold the programmed frequency so i can use in a computer like a ttl clock ?

[pascalmestdagh]

Hi Ian, I just replicated your set-up with an si5351 and Teensy4.0 with circuitpython and mu-editor, works fine! Would it be possible to post your circuit diagrams for the complete set-up somewhere together with a component list please? I would like to replicate your complete project. Very interesting and educational stuff overhere:) Best 73, Pascal, Belgium

[CharudattUplap]

Will this work with uPython ? Planning to emulate this code on RPi PICO using uPython

[karthikraja]

Hey, which connector did you use to connect the clock output to Oscilloscope?