The module is a dual-DDS signal generator based on AD9850 and AD9851, providing multiple waveform outputs for flexible RF and electronics experiments. It supports two sine wave outputs and two square-wave outputs for a range of applications. Key features and benefits - Dual DDS options with clear frequency ranges - AD9850: 0 to 40 MHz - AD9851: 0 to 70 MHz - At frequencies above about 20–30 MHz, harmonic content increases and the waveform becomes less clean - Square (rectangular) wave output: 0 to 1 MHz - Improved waveform quality - A 70 MHz low-pass filter is used to improve signal-to-noise ratio and overall waveform quality - Flexible amplitude adjustment - Includes a pin to generate the DAC reference (DA reference), enabling easier adjustment of output amplitude for different applications - Adjustable duty cycle for square waves - The comparator reference input is generated by a variable resistor, allowing adjustment of the square-wave duty cycle - Stable oscillators - AD9850 module uses a 125 MHz active oscillator - AD9851 module uses a 30 MHz active oscillator - Both configurations deliver stable and reliable performance - Compact and easy to integrate - Module size: 5 cm x 2.6 cm Specifications at a glance - Waveform outputs: two sine wave outputs and two square-wave outputs - DDS IC options: AD9850 and AD9851 - Sine wave frequency range: AD9850 0–40 MHz; AD9851 0–70 MHz - Square wave frequency range: 0–1 MHz - Harmonic considerations: cleaner waveform at lower frequencies; higher harmonics and reduced purity at higher frequencies (above ~20–30 MHz) - Waveform conditioning: 70 MHz low-pass filter for improved SNR and quality - Amplitude control: DA reference pin for output amplitude adjustment - Square wave duty cycle control: variable resistor on comparator reference input - Oscillators: 125 MHz (AD9850) and 30 MHz (AD9851) - Physical dimensions: 5 cm x 2.6 cm Use scenarios - RF test bench and lab experiments - Generate precise sine and square wave signals for calibrating equipment, testing mixers, amplifiers, and receivers across the AD9850 and AD9851 ranges - Microcontroller/FPGA waveform generation - Produce stable reference signals for timing, clocking, or carrier generation in embedded projects, with adjustable amplitude and duty cycle - Education and demonstrations - Demonstrate DDS concepts, waveform synthesis, and the effects of frequency, amplitude, and duty cycle on signal quality in teaching labs or DIY projects This description preserves the original product brand and specifications, while presenting the information in a clear, customer-focused format that highlights function, performance, size, and practical applications.