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How do I calculate the maximum bandwidth?
As a first order model, the digiPOT performs as a basic RC filter. The capacitance is added by the W pin capacitance and the resistance should be calculated from the parallel between RAW and RWB. The worst case scenario is at half scale when RAW and RWB are at a maximum. Incrementing or decrementing the code makes the parallel resistor smaller, increasing the BW in the digiPOT.