A method and apparatus for an adjustable filter system comprises a first integrated circuit generating a reference value that represents a corner frequency of a filter within the first integrated circuit; sending the reference value that represents the corner frequency of the filter across an interface to a second integrated circuit; receiving, across the interface from the second integrated circuit, a filter adjustment value; and changing the corner frequency of the filter using the filter adjustment value to adjust a passband and a stopband of the filter. The apparatus and method also comprises a second integrated circuit detecting a filter adjustment event, wherein the filter adjustment event comprises receipt of the reference value; calculating the filter adjustment value to change a corner frequency of the filter within a first integrated circuit; and sending the filter adjustment value across the interface to the first integrated circuit.