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Adafruit Si5351A Clock Generator Breakout Board - 8KHz to 160MHz [ADA2045]

  • Based on 95 reviews
Condition: New
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Availability: 20 left in stock
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Arrives Wednesday, Dec 25
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Features

  • Si5351A clock generator (from 8KHz to 150+ MHz)
  • i2c interface
  • 3 independent outputs
  • Outputs are 3Vpp
  • Includes 3.3V LDO regulator and level shifting circuitry

Description

Never hunt around for another crystal again, with the Si5351A clock generator breakout from Adafruit! This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from <8KHz up to 150+ MHz. The Si5351A clock generator is an I2C controller clock generator. It uses the onboard precision clock to drive multiple PLL's and clock dividers using I2C instructions. By setting up the PLL and dividers you can create precise and arbitrary frequencies. There are three independent outputs, and each one can have a different frequency. Outputs are 3Vpp, either through a breadboard-friendly header or, for RF work, an optional SMA connector. We put this handy little chip onto it's own breakout board PCB, with a 3.3V LDO regulator so it can be powered from 3-5VDC. We also put level shifting circuitry on the I2C lines so you can use this chip safely with 3V or 5V logic.

Brand: ‎Adafruit


Item model number: ‎2045


Item Weight: ‎0.16 ounces


Product Dimensions: ‎2 x 1 x 1 inches


Item Dimensions LxWxH: ‎2 x 1 x 1 inches


Manufacturer: ‎Adafruit


Is Discontinued By Manufacturer: ‎No


Date First Available: ‎March 12, 2015


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Dec 25

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Quality board
I first bought a clone of this board, which didn't perform well at all. Big mistake. I should have bought this one to begin with! Purchased this one, and it performs flawlessly in my project. I do wish there was an option with a TCXO. I may look into retrofitting this board with a TCXO.
Reviewed in the United States on March 4, 2023 by David G Richards

  • Keeps accurate time
Picked up this one after the knockoff failed to keep accurate time. Very pleased thus far.
Reviewed in the United States on February 14, 2024 by B_Anonymous

  • Verified capability
I wanted to use the Si5351A in a design and thought it would be worthwhile to test it's programming and capability with this breakout board. I connected to a Raspberry Pi4 I2C. The easiest way to get the required values for any frequency is the ClockBuilder Pro program from Silicon Labs and have it generate all the register settings. I manually asked for 40 frequencies (500KHz to 20MHz in 500KHz increments) and put them into a CSV file then wrote a program that will read the CSV file, find and set the requested frequency. Worked so well I decided to take an older Raspberry Pi2B , bought female 40pin socket and small plated perf board and made a clock generator for my work bench. I can VNC from my laptop to set the frequency I want. NOTE: The SiLab spec sheet says the part's range is 2.5kHz to 200MHz. I verified 2.5kHz and 100MHz (my digital scope's limit). ... show more
Reviewed in the United States on December 31, 2019 by Michael Bienek

  • Very neat little unit.
Great little unit. Easy to wire up to the Arduino and program. Only downside, though not for me, is you have to solder the pins on if you're going that route.
Reviewed in the United States on December 29, 2018 by APayne

  • Great product
Works great, great product and great price
Reviewed in the United States on November 15, 2017 by William Verstelle

  • Capable, but read the Adafruit docs
Capable little chip - read the documentation and example code at Adafruit. In the cleaner integer mode it is somewhat restricted in the frequencies it can generate, however I was able to find a ratio which did what I wanted. Alas, the circuit I connected it to turned out not to work, even when I used this to inject the intended frequency, but no fault of the module. ... show more
Reviewed in the United States on September 30, 2017 by Chris

  • Crystal replacement easy to program
Pro: Exactly the device to replace old aged, off frequency quartz crystals. Was easy to program with Arduino for exact frequencies of all three channels. Con: Really needs a choice of output connectors.
Reviewed in the United States on May 4, 2019 by dave71203

  • Great product at a fair price.
Great design, excellent build quality, ample documentation.
Reviewed in the United States on April 22, 2021 by constant variable

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