A few exciting developments here on the Si5351 front. First off, I took the C code from my Si5351 library for avr-gcc and converted it to an Arduino/C++ library, which you can find here. It replicates the functionality in the avr-gcc library, but makes it quite a bit easier to rapidly implement designs. I've tested this design on an Arduino Uno and an Arduino Uno clone, but I see no reason why the library shouldn't work on other Arduino variants as well. Please give it a try and leave feedback on the GitHub page if you find bugs or have suggestions for improvements.
I got one quickly populated with components and paired it with an Arduino in order to test the new library. As you can see in the photo at the top of the post, it's a pretty small little board, but it's pretty powerful for its size. All you do is connect VCC, GND, and the I2C SDA and SCL lines to the Arduino, and you get three independent transformer-isolated outputs on SMA connectors that can generate 1 to 150 MHz (in the future the library will be modified to allow the full 8 kHz to 160 MHz range)
Will I end up selling these as a kit? I'd like to but I'm uncertain at this point. Oddly enough, I just found out that it's highly likely that Adafruit will also be selling a Si5351 breakout board. If you watch the video below at about the 6:22 mark, you'll see it.
I'm a bit surprised by this, as RF is not something that I was aware that Adafruit was interested in. To be honest, it will be difficult to compete against the relatively much larger fish in the hobbyist pond that is Adafruit. Although, it looks as though my breakout board has something that the Adafruit board does not: isolation output transformers. Most likely, I will do one trial kitting run and see if there will be enough interest for another after that. Keep an eye on the blog for further news about that in the near future.