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CD4046B: C1 capacitor

Part Number: CD4046B


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