Hi
According to datasheet, there are some limitation of the external component as below.
If the component such as C1 is smaller than above range (e.g. In case of 100pF<C1 @VDD>5V or 50pF<C1 @VCC>10V)what is it concerned? (What is that affected to?)
And what C1 is for ? I guess the C1 is the resonant circuit of VCO. So,I think C1 may be affected to the frequency range of VCO.
Best Regards,
Koji Hamamoto