Specifically, using only the function of the VCO, R1 = R2 = 2 MΩ to 10 MΩ, C1 = 0 to 10 pF, VCOIN is connected to GND, the value of C1 is adjusted and a rectangular wave of a certain frequency is output from VCOOUT Take out it, and input it to another device.
So, I designed it with reference to the graph below, but I would like to know what effect this has on VCOIN = 0.5 *Vcc, and how does it affect VCOIN = 0 V? Does the linearity of the frequency to the capacity be lost?
Here, Stray capacitance at pins 6 and 7 are not limited by the pin-to-pin capacity, but what other factors do you have?