Adafruit
Adafruit Si5351A Clock Generator with STEMMA QT - 8KHz to 160MHz
The Adafruit Si5351A Clock Generator with STEMMA QT lets you generate precise, arbitrary clock frequencies from 8 kHz to over 150 MHz using a simple I2C inte...
The Adafruit Si5351A Clock Generator with STEMMA QT lets you generate precise, arbitrary clock frequencies from 8 kHz to over 150 MHz using a simple I2C interface. This updated version adds STEMMA QT / Qwiic connectors for solderless hookup alongside the traditional breadboard headers.
With a precision 25 MHz crystal reference and internal PLLs and dividers, it provides three independent outputs, each configurable to a different frequency with 3 Vpp output levels. Output #1 supports an optional edge-launch SMA connector for RF work. Onboard 3.3 V regulation and I2C level shifting allow use with both 3 V and 5 V systems.
Key Features
- Si5351A Clock Generator – I2C-controlled with onboard 25 MHz precision crystal reference
- Wide Frequency Range – 8 kHz to 150+ MHz output
- 3 Independent Outputs – Each output can be set to a different frequency
- 3 Vpp Output – Via header pins; output #1 supports optional edge-launch SMA connector
- STEMMA QT / Qwiic Connectors – Solderless I2C connection and daisy-chaining
- 3–5 V Power – Onboard 3.3 V LDO regulator and level shifting
- Arduino & CircuitPython – Library support for both platforms
Also Consider
- Si5351A Clock Generator Breakout (non-QT) – Original version with SMA connector pads on all three outputs
Ideal For
- Replacing fixed crystals and oscillators in prototypes
- RF and radio projects requiring precise clock signals
- Test and measurement equipment
- Digital signal processing and clock generation
Package Contents
- 1× Adafruit Si5351A Clock Generator with STEMMA QT
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- Headers
- Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- RF
- RF means radio frequency, referring to signals used for wireless communication and other high-frequency electronics. A low-noise, stable power supply is important for RF circuits because power noise can affect signal quality and measurements.
- SMA
- A threaded coaxial connector commonly used for antennas. It matters because you need antennas with matching SMA connectors, or suitable adapters, for the LTE and GNSS antenna ports.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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