That could be. How are you powering the Pi? For the final build you should use a buck converter set to about 5.4 volts and power the pi through the GPIO pins.? With that, I had no problem picking off the 3.3 volts from the pi on board regulator.??
After having some stability problems with the SI-5351 clocks with Farhan:s advice I moved the? SI 5351 off of the digital board and on to the analog board and powered it with its own voltage regulator.
To avoid ground loops there should be one and only one ground path to the digital board and that is going back to the input 13.4 volt supply.? So when you're done the only connection between the pi and the SI-5351 will be the I2C lines.
Yes you can wait on changing out the crystal who are you work on the analog circuit.
73, Dean
73,
Dean
