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How to Calculate Rt for LTC3260

Thread Summary

The user asked about synchronizing the LTC3260 oscillator frequency with an FPGA's internal clock, specifically for 312.5 kHz. The final answer confirmed there is no formula to calculate the Rt value and the part lacks a sync pin, making precise synchronization difficult. The frequency can only be roughly matched, with variations due to pin and resistor tolerances.
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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?

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