AD9850 module — concise product description and benefits Key features and benefits 125 MHz quartz reference: Built around a 125 MHz crystal oscillator for stable DDS timing and predictable frequency generation. Multiple outputs: Provides two sine-wave outputs and two square-wave outputs so you can drive different circuits or measurement paths simultaneously. Cleaner waveform up to 70 MHz: Includes a 70 MHz low-pass filter to reduce high-order harmonics. Note that as output frequency increases by ~20–30 MHz, harmonics grow and waveform purity declines, so use the LPF and keep primary signals below the filter cutoff for best results. The module’s filtered output is better than the SN. Output amplitude control: DA output reference pin (PIN12) lets you adjust the output level conveniently to match downstream stages or measurement equipment. Adjustable comparator reference: A variable resistor generates the comparator reference input voltage, allowing you to tune threshold and comparator behavior for your application. Compact module form factor: Delivered as a PCB module ready to integrate into projects that use AD9850-type DDS modules. Function and performance highlights Function: Direct Digital Synthesis (DDS) signal source providing precise frequency control with sine and square outputs. Performance considerations: Best waveform purity when operated with the LPF engaged and with output frequencies well under the LPF cutoff. Expect increasing harmonic content as frequency rises by 20–30 MHz above lower bands. Controls and tuning: PIN12 for DA output reference simplifies amplitude adjustment; the onboard variable resistance lets you set the comparator reference voltage without additional circuitry. Compatibility and practical attributes Compatibility: Designed for use where AD9850-compatible modules and control interfaces are employed; integrates into typical DDS-based signal generation setups. Material and construction: Standard PCB-based module with conventional electronic components and connectors for straightforward mounting and wiring. Size and integration: Compact module form suitable for bench prototypes, embedded projects, and laboratory test rigs. Suggested use scenarios RF prototyping and LO generation: Use as a local oscillator or signal source for mixers, filters, and RF circuits where a clean signal up to the LPF cutoff is required. Test bench and measurement: Provide sine and square test signals for amplifier, filter, or ADC characterization; adjust output level via PIN12 to match test equipment input ranges. Embedded or MCU-controlled signal generator: Integrate with microcontrollers to produce programmable frequencies and waveforms; use the variable resistor to fine-tune comparator thresholds for digital-level outputs. What this module solves Provides a compact, controllable DDS source with both sine and square outputs. Makes output amplitude and comparator thresholds easy to adjust without redesigning downstream circuitry. Improves usable waveform purity for midband signals with the included 70 MHz low-pass filter. Specifications (as provided) Crystal reference: 125 MHz quartz Outputs: 2 sine-wave outputs, 2 square-wave outputs Low-pass filter: 70 MHz DA output reference pin: PIN12 (for output adjustment) Comparator reference adjustment: Variable resistance for generated comparator reference input voltage If you need a compact AD9850-based DDS module with adjustable output level and comparator reference, and cleaner midband waveforms thanks to the 70 MHz LPF, this module provides those capabilities in a ready-to-integrate PCB format.