Si5351A clock generator breakout offers a compact, programmable clock source with real-world reliability for projects that need multiple clean frequencies. It uses a precise 25 MHz crystal reference and internal PLLs and dividers to generate a wide range of frequencies. Being IC-controlled, you set target frequencies by issuing simple I2C commands to configure the PLLs and dividers. Key benefits - Three independent outputs: each can run at a different frequency, delivering 3 Vpp signals via breadboard-friendly headers or optional SMA connectors. - Flexible and scalable: plan your clock architecture in one device instead of juggling multiple crystals and oscillators. - Easy power and safety: operates from 3–5 V DC. Onboard 3.3 V LDO regulator and level-shifting circuitry keep 3 V and 5 V logic compatible. - Ready to use: compact breakout mounted with all needed circuitry, minimizing wiring and layout work. What makes it better - Integrated solution with a precise reference and programmable PLLs/dividers, reducing parts count and complexity. - I2C-controlled, allowing dynamic frequency changes without hardware swaps. - Small form factor with breadboard-friendly or SMA outputs for quick prototyping and reliable lab use. Applications - Embedded microcontroller systems requiring multiple clocks or different clock domains - RF and wireless experimentation, SDR, and test benches - Signal generation and timing references for lab equipment and digital projects Note: No additional crystals are required beyond the inherent 25 MHz reference on the chip.