DDS Signal Generator Module Development Board Key benefits Flexible dualoutput DDS with 2 sine waves and 2 square waves, suitable for both analog sine generation and programmable square wave testing. Wide frequency coverage with model options: 040 MHz for AD9850 and 070 MHz for AD9851. Note that harmonics increase and waveform cleanliness decreases beyond approximately 2030 MHz; square wave output remains available up to 1 MHz. Improved signal quality through a dedicated 70 MHz lowpass filter, delivering better signaltonoise ratio for the generated waveform. Precise amplitude and duty cycle control: an A pin is provided for convenient amplitude adjustment of the output signal. The comparator reference input voltage is generated by a variable resistor, enabling different duty cycles for square waves. Stable oscillator design: the AD9850 variant uses a 125 MHz active oscillator and the AD9851 variant uses a 30 MHz active oscillator, ensuring reliable and stable performance. Key features Output capability: two sine wave outputs and two square wave outputs. Frequency range by module type: AD9850 040 MHz; AD9851 070 MHz. Harmonics and waveform quality: expect increased harmonics and reduced cleanliness as frequency approaches the upper end of the range (notably beyond 2030 MHz). Square wave support: square wave output up to MHz. Signal integrity: 70 MHz lowpass filter to improve signaltonoise ratio. Amplitude and duty cycle control: A pin for amplitude adjustment; variable resistor for the comparator reference input to set square wave duty cycles. Oscillator stability: AD9850 uses a 125 MHz active oscillator; AD9851 uses a 30 MHz active oscillator. Compatibility and usage Compatible with AD9850 and AD9851 based DDS modules, enabling straightforward integration into existing test benches and development boards. Suitable for bench testing, signal conditioning experiments, and educational demonstrations of DDS concepts. Applications and use scenarios RF and communications lab testing: generate precise sine or square wave signals for characterizing filters, amplifiers, mixers, and PLLs across the 040 MHz (AD9850) or 070 MHz (AD9851) range. DSP and microcontroller/FPGA development: provide reliable clocklike waveform sources for timing, waveform shaping experiments, or demonstration of DDS principles in teaching labs. Waveform shaping and experimentation: adjust amplitude and squarewave duty cycle to study effects on dutycycle dependent circuits, comparators, and timing analysis. Notes For the cleanest sine waves, operate within the lower portion of the frequency range; expect some degradation in harmonic content as frequencies increase toward the upper limits. The 70 MHz lowpass filter is designed to enhance SNR and reduce harmonics, especially important when generating higherfrequency signals or using square waves. This description preserves the original product brand, specifications, models, and functions without adding or omitting details.