1. DDS Signal Generator Module Development BoardThe module can output 2 sine waves and 2 square waves, with a frequency range of 0 40MHz for AD9850 and 0 1MHz for square wave. The harmonics increase and the waveform becomes impure after 20 30 MHz frequency. The SN ratio of the waveform is improved by using a 70 MHz low pass filter. 2. Amplitude adjustment and variable switch on cycle: the module has a pin (PIN that generates the DA reference, which allows adjustment of the output waveform amplitude. The duty cycle of the rectangular shaft can be adjusted by a variable resistance. 3. Oscillator Flexible Input The AD9850 module has a 125MHz active oscillator while the AD9851 module uses an active oscillator at 30MHz. The module supports both parallel and serial data input. 4. Compact Design The dimensions of the module are 5cm x 2.6cm, making it compact and space saving.