I am sampling the ADC at 1Mhz, I have a 30K resistor from the RefOut pin to another 30K resistor to gnd. On the center tap between these resistors I have a 1K resistor into the Vin pin. I am seeing 1.084V on the Vin pin. When I remove the 1K resistor (isolating the Vin pin from being in parallel with the lower 30K resistor) the divider is correct at 1.25V.