Precautions: 1. It can be powered by 3.3v pin, and the power supply can provide a current of not less than 500mA. 2. The typical power supply is 5v. Product introduction: The core chip uses ADF4351, which is optimized according to the official principles and has extremely high power flatness within the entire module working frequency band. Product parameters: 1. Output frequency range: ADF4351: 35M-4400M (4.4G) 2. Output signal: 2200M-4400M fundamental wave (sine wave) 35M-2200M fundamental wave frequency division (square wave) 3. Output signal interface: SMA female 4. Default +-50ppm 25M active crystal oscillator. Provides circuit diagram and STM32 test program in PDF format. 5. Control : three-wire SPI. Leads out control pin and lock status pin. All functions can be realized, including point frequency, frequency sweep and frequency hopping. can be up to 1K and the low frequency step can be up to 0.1K. According to the crystal Determined by frequency. Loop Frequency Synthesizer Material: plastic colour: Black Package Contents: 1 x ADF4351 Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.