Adafruit
Adafruit Si5351A Clock Generator Breakout Board - 8KHz to 160MHz
The Adafruit Si5351A Clock Generator Breakout lets you generate precise, arbitrary clock frequencies from 8 kHz to over 150 MHz using a simple I2C interface....
The Adafruit Si5351A Clock Generator Breakout lets you generate precise, arbitrary clock frequencies from 8 kHz to over 150 MHz using a simple I2C interface. With a precision 25 MHz crystal reference and internal PLLs and dividers, it eliminates the need to hunt for specific crystals or oscillators for your projects.
The breakout provides three independent outputs, each configurable to a different frequency with 3 Vpp output levels. Outputs are available through breadboard-friendly headers or optional SMA connectors 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 or optional SMA connector for RF applications
- I2C Interface – Simple two-wire control with level shifting for 3 V and 5 V logic
- 3–5 V Power – Onboard 3.3 V LDO regulator
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 Breakout
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- 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.
- 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.
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