AD9850 and AD9851 DDS Waveform Generator Module Key features Dual channel sine and square outputs: two sine wave outputs and two square wave outputs available for flexible signal generation. Wide frequency options: AD9850 model covers 0 to 40 MHz and AD9851 model covers 0 to 70 MHz. Note that at higher frequencies (above 20–30 MHz) harmonics increase and waveform quality may degrade. Square wave output is available up to 1 MHz. Improved waveform quality: a 70 MHz lowpass filter is included to improve signaltonoise ratio and overall waveform fidelity. Flexible amplitude control: a dedicated pin for generating the DAC reference allows adjustment of output amplitude to suit different applications. Adjustable square wave duty cycle: the comparator reference input is driven by a variable resistor, enabling tuning of the square wave duty cycle. Stable oscillators: AD9850 version uses a 125 MHz active oscillator; AD9851 version uses a 30 MHz active oscillator for reliable operation. Compact form factor: module measures 5 cm by 2.6 cm for easy integration into projects and enclosures. What it solves Provides precise DDS based sine and square wave generation with two selectable models (AD9850 and AD9851) to cover a wide frequency range. Delivers cleaner waveform through filtering, while offering adjustable amplitude and duty cycle to meet diverse test needs. Small, easytointegrate package suitable for bench experiments, education kits, and embedded projects. 2–3 practical use scenarios RF and microwave lab experiments: generate clean sine or square wave signals for amplifier tests, mixer experiments, or calibration across the specified frequency ranges. Digital and mixedsignal testing: supply precise clocks or datapattern waveforms to microcontrollers, FPGAs, DAC/ADC characterization setups, or signal integrity demonstrations. Educational and prototype development: use in electronics teaching kits or initial prototype labs to illustrate DDS concepts, waveform shaping, and dutycycle control. Notes Higher frequency operation may exhibit increased harmonics; the 70 MHz lowpass filter helps mitigate this and improve waveform quality. The two outputs per waveform type (sine and square) provide flexibility for various signal generation tasks without additional routing.