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How to improve linearity of AD650?

Question asked by on Jun 4, 2016
Latest reply on Jun 13, 2016 by jcolao

Hello everyone,

     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!