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AD5342, question on reference input



Please let me ask what is impedance value of reference input(VrefA and VrefB) of AD5342, when it is not powered ?


We are now studying one issue of our board, and it seems reference input is powered before the part is powered. To understand what is occured, we would like to know the value of impedance.  BUF pin is connected to +3.3V, but it should be 0V by connected to GND when it is not powered.


Thank you very much for your support,


Best Regards,

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