off chip to reduce the difficulty and cost associate with fabricating a capacitor with high capacitance on the chip 510 the capacitor 520 is connected to the high pass filter through output node 508 in addition to using an off chip capacitor 520 to provide capacitance for the high pass filter by selecting from difference capacitance for capacitor 520 the high pass filter can be tuned for example the cut off frequency of the high pass filter can be adjusted by adjusting the capacitance coupled to pin 508 in operation transconductance element 504 produces a current proportional to the output voltage of amplifier 506 this current is driven into external capacitor 520 the voltage across the capacitor is proportional to the integral of the current driven through it this voltage is sampled by feedback subtractor 504 and subtracted from the output of dac 202 and supplied to amplifier 506 thus completing the feedback loop the embodiment of fig5 illustrates an audio high pass filter for a single audio channel this solution may be extended to additional audio channels such as each channel in a stereo pc by adding two high pass filters along with corresponding pins and capacitors fig6 illustrates an embodiment of an integrated audio codec employing a digital high pass filter when integrated circuit 610 receives a digital audio signal destined for speaker 242 it passes through digital high pass filter 602 which removes potentially damaging low frequency signals the filtered digital audio signal is then passed to dac 202 which converts the audio signal to analog speaker driver 232 drives speaker 242 with the analog audio signal digital high pass filter 602 is controlled by interface circuit 604 which receives tuning information through pin 606 in one embodiment interface circuit 604 receives tuning information through pin 606.