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Programmable Clock Generator — Si5351A (8KHz to 160MHz)
The Adafruit Si5351A Clock Generator Breakout produces up to three independent clock outputs ranging from 8 KHz to 160 MHz, all programmable over I2C. It's an essential tool for radio projects (SDR local oscillators), signal processing experiments, test equipment, frequency synthesis, and replacing bulky crystal oscillator collections with a single programmable board.
Why you'll love it
- 3 independent outputs: Each set to a different frequency simultaneously
- 8 KHz to 160 MHz: Covers audio, RF, and digital clock frequencies
- I2C control: Set frequencies with simple register writes from any microcontroller
- Low jitter: Clean signals suitable for radio and precision timing
Technical specifications
| Chip | Si5351A (Silicon Labs) |
|---|---|
| Outputs | 3 independent clocks |
| Frequency range | 8 KHz – 160 MHz |
| Interface | I2C |
| Supply | 3–5V (onboard regulator) |
Frequently Asked Questions
Can I use it as an SDR local oscillator? Yes — this is one of its most popular uses. It replaces bulky VFO circuits in amateur radio receivers.
How precise are the frequencies? Very. The PLL-based architecture can synthesize frequencies with sub-Hz resolution.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
Compatibility & downloads
// downloads
- GitHub PCB repo git
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