Adafruit Si5351A CLOCK GENERATOR STEMMA QT I2C

Adafruit Si5351A Clock Generator Breakout

The Adafruit Si5351A clock generator breakout eliminates the need to stock multiple crystals – it features a precise 25 MHz reference crystal, internal PLLs, and dividers, allowing it to generate almost any frequency from 8 kHz to 160 MHz.

The Si5351A is an I2C-controlled clock generator. It uses the onboard precision crystal to drive multiple PLLs and dividers, creating accurate and arbitrary frequencies. There are three independent outputs, each configurable to a different frequency. Outputs are 3 Vpp, accessible through a breadboard-friendly header or via an optional edge-launch SMA connector (output #1) for RF applications.

The breakout is built in the STEMMA QT form factor, making it easy to interface. The STEMMA QT connectors are compatible with SparkFun Qwiic connectors, enabling solderless connections and easy daisy-chaining with other I2C devices. Onboard 3.3V LDO regulator and level shifters ensure compatibility with both 3V and 5V power and logic.

Adafruit also provides a detailed tutorial and library for Arduino-compatible microcontrollers and CircuitPython/Python, making it simple to get started right away.

Technical Details:

• Generates up to 3 non-integer-related frequencies from 8 kHz – 160 MHz
• I2C user-definable configuration
• Exact frequency synthesis at each output (0 ppm error)
• Highly linear VCXO
• Low output jitter: 100 ps pp
• Programmable rise/fall time control
• Glitchless frequency changes
• Very low power consumption
• PCIE Gen1 compliant, supports HCSL compatible swing
• Operates from an onboard fixed-frequency 25 MHz crystal

Product Dimensions:

• Size: 25.3 mm x 17.7 mm x 4.7 mm
• Weight: 1.7 g

Packaging includes:

• Adafruit Si5351A clock generator
• pin header

Links:

Product information page