Select a correct voltage controlled oscillator IC
Why are you using a VCO (variable) if you only need a fixed frequency?

In any case, according to the datasheet you linked, pin 1 should never be connected to VDD. In the VCTCXO variation, this is the control voltage, which must remain between 0.5 and 2.5 V. In the plain TCXO variation, it should either be left open or grounded.