DDS Signal Generator Module Development Board Output capability: the module can output two sine waves and two square waves. Frequency ranges and notes: 040 MHz for the AD9850 version and 070 MHz for the AD9851 version. However harmonics increase and waveform cleanliness decreases after 2030 MHz. Square wave output is available up to 1 MHz. Improved signal quality: equipped with a 70 MHz lowpass filter to deliver a better signaltonoise ratio for the waveform. Adjustable amplitude: an A pin is provided for convenient amplitude adjustment of the output waveform. The comparator reference input voltage is generated by a variable resistor, allowing different duty cycles of square waves. Stable oscillator: the AD9850 module uses a 125 MHz active oscillator, while the AD9851 module uses a 30 MHz active oscillator, ensuring stable and reliable performance. Use scenarios RF and communications experiments: generate precise sine or square wave signals across a wide frequency range to test mixers, amplifiers, filters, and receivers. Instrumentation and lab testing: create reference signals for calibration, spectrum analysis, and ADC/DAC characterization. Education and development: practical DDS waveform generation for learning about frequency synthesis, waveform shaping, and duty cycle effects on square waves.