Here is another TCXO in 3225 package https://ecsxtal.com/store/pdf/ECS-TXO-3225.pdf. Pin 1 is NC for plain TCXO variant.
Should be fine if left floating or connected to GND.
The datasheet you just linked to says "NC or Vcont" - not GND?
It should be OK left floating but may need to be tied high.
Okay, tied to Vcc makes more sense to me than to GND
The manufacturer's test circuits are here
Does "test circuit" mean this is used to test the correct functionality of the TCXO (but not required in the final product) or is this the circuit required for the TCXO to function correctly?
It may actually be easier to simply get one with a rail-to-rail CMOS output
Thanks!
depending on your specific CPU's requirements you may need to square the STO-3225A output up with a carefully biassed buffer or fast comparator.
The datasheet of my CPU actually says that there is a "Clock Squarer" right after the SYSCLK input - so I guess it should be fine just using the clipped sine wave?
Edit: I found a document about VTCXO recommendations for my CPU and the manufacturer listed "TOH2600DPI4CNP" (
http://www.quartz1.com/price/PIC/407N0095613.pdf) as "OK". It has the same characteristics as the TCXO mentioned in my first post (Clipped Sine Wave, 0.8Vp-p Min) besides the fact that it creates a 26MHz clock (which is fine, the CPU accepts 13 and 26 MHz). So I guess I will stick with the one in my first post unless I shouldn't?