DDS signal generator module development board Overview This development board provides a versatile DDS signal source based on AD9850/AD9851 technology. It delivers two sine wave outputs and two square wave outputs with flexible frequency ranges, making it suitable for laboratory testing, experiment setups, and prototyping of RF and digital systems. Key benefits - Flexible output options: two sine wave channels and two square wave channels to cover a wide range of test signals. - Wide frequency coverage: adjustable range suitable for DDS devices, enabling experimentation across multiple applications. - Improved signal quality: a dedicated 70 MHz low-pass filter enhances signal-to-noise ratio for cleaner waveforms. - Easy amplitude control: an amplitude adjust feature via a dedicated pin simplifies setting desired output levels. - Adjustable square wave duty cycle: the comparator reference voltage is generated with a variable resistor, allowing different square wave on/off timings. - Stable and reliable: uses active oscillators chosen for each DDS model to support stable operation. Core specifications and features - Output: two sine wave outputs and two square wave outputs. - Frequency range (DDS models): - 0–40 MHz for AD9850 - 0–70 MHz for AD9850 - Note: the module supports two DDS families and provides corresponding performance. - Square wave output: up to 1 MHz. - Signal conditioning: includes a 70 MHz low-pass filter to improve signal-to-noise ratio and waveform integrity. - Amplitude adjustment: a dedicated pin (pin included in the package) provides convenient control of the output amplitude. - Comparator reference: the input reference voltage for the comparator is generated by a variable resistor, enabling different square wave duty cycles. - Oscillators: - AD9850 module uses a 125 MHz active oscillator. - AD9851 module uses a 30 MHz active oscillator. - These choices are intended to provide stable and reliable performance for their respective devices. Compatibility and usage - Designed to work with AD9850 and AD9851 DDS devices, enabling straightforward integration into test setups and development projects. - Suitable for use as a flexible signal source in RF circuits, communication system experiments, and general-purpose lab testing. Use scenarios - RF circuit testing: generate stable carrier and harmonics to characterize filters, amplifiers, and mixers, with configurable amplitude and duty cycle for realistic signal conditions. - Communications experiments: create test signals for modulation schemes, frequency sweeps, or LO reference signals within the supported ranges. - Prototyping and demonstrations: use as a compact, controllable DDS source for microcontroller or FPGA projects that require precise, repeatable waveforms. Notes - Frequency ranges are selected per DDS model as described, providing broad coverage for AD9850 and AD9851 devices. - The 70 MHz low-pass filter is included to enhance waveform quality and reduce unwanted high-frequency content. - The package includes a pin for amplitude adjustment and a variable resistor for setting square wave duty cycle via the comparator reference. This description preserves the product brand, models, functions, and specifications while presenting the information in a clear, customer-centric format.