I am designing a Voltage-to-Frequency circuit with AD650, and now I meet some problem about linearity. I make the schematic according to AD650 datasheet, as shown in the following figure.
I choose the input resistor, One-Shot capacity and integral capacity according to recommended value of datasheet. But the linearity is bad, it is much worse than the qualification in datasheet.
How can I improve the linearity? I am looking forward to anyone's reply. Thank you!