We would like to synchronize the oscillator frequency of the LTC3260 with the internal clock of an FPGA.
However, it is difficult to accurately read the Rt value from the graph on page 4.
Is there a calculation formula to determine the Rt value from the desired oscillator frequency?
For example:
FPGA internal CLOCK 10 MHz ⇒ LTC3260 312.5 kHz
Since the red line in the provided graph is not linear, it is difficult to determine the resistance value for 312.5 kHz.
If there is no calculation formula, is my understanding correct that precise synchronization is difficult and we can only roughly match the frequencies?