Communication library to interface with Analog Devices ADF4350 PLL IC.

In your Arduino sketch, you'll want to include the SPI library in addition to this code:

#include <SPI.h>
#include <ADF4350.h>

#define PLL_LE_PIN 8
ADF4350 PLL(PLL_LE_PIN);

void setup()
{
  //init ADF4350 with 10MHz reference and tune to 432.000MHz
  PLL.initialize(432000, 10);
}

Full example code can be found in example directory. adf4350-advanced example need to be connected 2x16 LCD display via i2c adapter (pcf8574 for example) and rotary encoder with push button. Also that example read heating status of FE-5680A rubidium frequency standard. Remove HEAT_PIN if you using other reference frequency source.

The ADF4350 works with 3.3V logic levels, not 5V. Be careful if you're using an Arduino Uno or similar!

Self-explanatory functions...

• ADF4350::initialize(int frequency, int refClk) -- initializes PLL with given frequency (KHz) and reference clock frequency (MHz).
• ADF4350::getFreq() -- returns current frequency
• ADF4350::setFreq(long freq) -- sets PLL to output new frequency freq (in KHz).

Functions you should use after consulting datasheet:

• ADF4350::setFeedbackType(bool feedback) -- fundamental vs. divided feedback
• ADF4350::powerDown(bool pd) -- power down the VCO (or not).
• ADF4350::rfEnable(bool rf) -- enable/disable output on the main RF output.
• ADF4350::setRfPower(int pow) -- pow should be 0, 1, 2, or 3, corresponding to -4, -1, 3, or 5 dBm.
• ADF4350::auxEnable(bool aux) -- enable/disable output on the auxilary output.
• ADF4350::setAuxPower(int pow) -- set auxiliary power output. Again, pow should be 0, 1, 2, or 3, corresponding to -4, -1, 3, or 5 dBm.