Module description: The AD9851 is a highly integrated device uses advanced DDS technology, coupled with an internal high-speed, high-performance D/A converter and comparator, to form a digitally programmable frequency synthesizer and clock generator function. When referring to the clock source, the AD9851 generates a stable frequency and performs a phase-programmable digital analog output sine wave. The sine wave can be used directly as a frequency source or internally converted into a square wave agile clock generator application. AD9851 . The high-speed DDS core accepts 32-bit frequency tuning words, resulting in an output tuning resolution of approximately 0.04 Hz when the system clock is 180 MHz. The AD9851 contains a unique 6 X REFCLK multiplier circuit eliminates the need for a high-speed reference oscillator. 6 X REFCLK multiplier has effect on SFDR and phase noise characteristics. Precautions for using the module: (1) The module is a low-power module, and the power supply does not 5.2V. (2) Since the module is a high-precision device, in order to avoid unnecessary interference, it is recommended to use a linear power supply. (3) It is recommended to use the SMA to BNC cable to directly observe the output signal for the output signal. Poor contact or poor wires may cause signal attenuation or excessive noise. (4) The delivered code is only used for the supporting main control board, and does not a microcontroller tutorial. Additional functions need to be developed by yourself. (5) If you need to simply test the function of the module, it is recommended to use it with the control board of . Power is supplied to the DDS module first, and then the power is supplied to the control board to generate a waveform. Long press the middle button to switch the function. Low noise regulator chip, etc. Module application: multiple; frequency signal generation, sine wave, square wave signal generation, sensor excitation Module parameters: Module model: AD9851 Module type: digital synthesis frequency source Module power supply: DC-5V Module current: 70mA (MAX); normal drive current 65mA (TYP) Module communication protocol: SPI serial or parallel Module provides routines: STM32F103RCT6 Routine : STM32F103X- KEIL5 version source code Module system main frequency: 180MHz (MAX) DAC resolution digits: 10 digits Phase accumulator : 32 Module output interface: SMA; 24-hour salt spray anti-oxidation Module output signals: sine wave, square wave; sine wave with 65MHz low-pass filter. Square wave coupling output. Module output channel: 2 channel differential; phase difference is 180 degrees, high frequency output will have phase shift due to filter Signal characteristics of the module: the sine wave has no coupling output; the output has own DC component. If it is connected to RF equipment, please a DC or use an oscilloscope to measure directly Maximum main frequency output sine wave signal range: 1Hz-65MHz The maximum main frequency output square wave signal range: 1Hz-30MHz; above 10MHz, the oscilloscope input impedance is 50 ohms, and the square wave duty is adjustable. Material: PC+Metal Color as shown Package Contents: 1 x AD9851 DDS Function Signal Generator Module Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.