ADF4351 Frequency Synthesiser Module

Module based on the Analog Devices ADF4351 integrated circuit, a wideband frequency synthesiser made up of a PLL (Phase-Locked Loop) and a VCO (Voltage-Controlled Oscillator). Besides the Analog Devices generator IC, the module carries its power stage built around LDO regulators, the loop filter, the 25 MHz active crystal oscillator used as the reference source and, lastly, the SPI serial interface and the power-on and lock-detect LEDs. It also has three SMA connectors, two of them marked OUT+ and OUT-, which bring the RF signal out on two complementary outputs, and a third marked REF IN for connecting an external reference source. There is also a DC IN connector for the supply input and a 2×5-contact connector for connection to the main board. 

• Output signal waveform:
  – sine wave at the fundamental from 2.2 GHz to 4.4 GHz;
  – square wave from 35 MHz to 2.2 GHz, by division of the fundamental frequency
• Output power programmable in 3 db steps: from -4 dBm to +5 dbm (+/- 1 db) into a 50 ohm load
• External RF reference source (SMA REF IN connector): frequency from 10 MHz to 250 MHz
• RF outputs with SMA connectors OUT+ and OUT-
• SPI serial communication interface
• Lock Detect and power indicator LEDs
• Functions programmable via software

• ADF4351 datasheet