Features All control pins are output for convenient use. It can be controlled by the official software of the upper computer. This ADF4351 signal source development board has a well-designed circuit board layout. Three-wire SPI lead to the control pin and state lock pin, allowing all functions, including spot frequency scanning and frequency hopping, switching to 1K, the low frequency pitch can be 0.1K, depending on the frequency of the crystal. Default Active Crystal Oscillator +-50ppm 25M. The circuit diagram in PDF format and the STM32 test program are provided. Features: Output Frequency Range: ADF4351: 35M-4.4G Power supply: DC002 DC4-9V interface (typical 5V) Output signal: fundamental waves 2.2-4.4G (Sine Waves), Fundamental Division 35M-2.2G (square waves) Signal output connector: SMA female Size: 49 x 37 x 12 mm/1.93 x 1.45 x 0.47 inches. File Download: http://pan.baidu.com/s/1o8gBCJS (password: gnxy) Package includes: 1 x Signal Source Development Board Note: This card requires professional knowledge and skills, be sure to know how to use it. Package List 1 x Signal Source Development Board