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DP83640: Function of Vref

Part Number: DP83640

Dear team, 

At datasheet, A 4.87 Kohm 1% resistor should be connected from VREF to GND. 

Please explain why resistor value is fixed and function of Vref register. I can find explanation of this function. If the customer connect other register value, what kind of side effect appear on the application? If there is a equation to calculate this value or there is min/max value of resistor, let me know.   

Thank you.