Teensy 3.6 crystal accuracy and how to improve it

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Polymorph

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I'm not new to electronics, but I am fairly new to Arduino and very new to Teensy.

For my first real project, I'm working on this in stages. The plan is start with a frequency counter with a GPS module as a reference/calibration standard, then that controls a DDS like the AD8951. The Teensy will check the output of the DDS and correct it as needed.

I see the Teensy 3.0/1/2 uses a 16MHz crystal. I think I could replace that with a TCXO with +-2.5ppm temp and +-1.5ppm initial accuracy.

But what does the Teensy 3.6 have on it? I see the clock is no longer a multiple of 16.

I may also borrow an idea from another thread here, and stick a Dallas 18B20 on board, but I'm worried about the complexity of changing the crystal register.

Please forgive my ignorance.
 
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