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ISO124: Leakage current and also use of Tantalum caps

Part Number: ISO124


Hi Team, 

Concerning isolation between the input and output side of this device, is there any data on what the isolation impedance is?  The reason I ask is that the isolation device is connected to a high impedance sensor  Also, is there any leakage current caused by the AC capacitance isolation circuit?  I see it is differential, but what happens if there is a mismatch between the two capacitor values?

Also, on the power supply filter there are 1uF tants shown on the schematic, is it OK to use ceramics?