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.