DDS Signal Generator Module Development Board Key benefits - Flexible dual DDS outputs: generates 2 sine waves and 2 square waves. Frequency range is 0-40 MHz for the AD9850 path and 0-70 MHz for the AD9851 path, with harmonic content increasing and waveform cleanliness decreasing beyond about 20-30 MHz. Square wave output reaches up to 1 MHz. - Improved signal quality: equipped with a 70 MHz low-pass filter to enhance the signal to noise ratio of the waveform. - Adjustable amplitude and duty cycle: an A pin is provided for convenient amplitude adjustment. The comparator reference input voltage is generated by a variable resistor, enabling different duty cycles of square waves. - Stable oscillator performance: uses a 125 MHz active oscillator for the AD9850 module and a 30 MHz active oscillator for the AD9851 module, ensuring stable and reliable operation. Specifications and features - Outputs: 2 sine wave channels and 2 square wave channels - Frequency range: 0-40 MHz (AD9850) and 0-70 MHz (AD9851) - Harmonics: performance degrades beyond 20-30 MHz due to increasing harmonics - Square wave: up to 1 MHz - Filtering: 70 MHz low-pass filter for improved SNR - Amplitude and duty cycle control: adjustable amplitude via A pin and variable resistor based reference for square wave duty control - Oscillators: AD9850 uses 125 MHz; AD9851 uses 30 MHz active oscillator Use scenarios - Bench testing and calibration of RF front ends and ADCs - Signal source for RF experiment setups and lab demonstrations - Prototype development for communication systems and timing studies This module provides a compact, reliable DDS signal source with clear control over amplitude, waveform type, and frequency, suitable for a range of laboratory and development tasks.