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AD5293 External Capacitor Selection

Question asked by peter@gkl on Oct 11, 2011
Latest reply on Oct 12, 2011 by musach

The AD5293 asks for an external capacitor of 1uF, 7V on the EXT_CAP pin.  But there is no mention of what this pin is really doing in the internal circuit.  Do i need to be concerned about leakage or distortion in the capacitor i.e. from using an electrolytic or ceramic? Perhaps it is bypassing some digital circuitry and I need a tantalum?  Will I see a noticible decrease in distortion with a polyester type?  I am concerned with minimizing the distortion while still having a simple digitally controlled variable potentiomter in my design.