Audio Gain Control Using Digital Potentiometers

Abstract: Digital potentiometers (pots) offer advantages for audio volume (gain) control applications and can replace bulky mechanical pots, especially in handheld portable devices such as MP3 players, PDAs, cell phones, mobile Internet devices, or stereo AM/FM radios. This document describes the types of digital pots available for audio control such as logarithmic taper pots (log pots). It examines several common designs using log taper pots and audio amplifiers, evaluates their advantages and disadvantages, and recommends circuit designs.