The WM2002 is a low power, high-quality stereo headphone driver, delivering Cirrus Logic’s patented ambient noise cancelation. The WM2002 supports analog playback or voice input, and analog microphones for noise cancelation. Designed for incorporation within a stand-alone headset or headphone, the Cirrus Logic ANC noise cancelation engine performs ambient noise cancelation during a voice call or during music playback. The WM2002 provides integrated power management, comprising a DC-DC converter, charge pump and LDO regulators. Different power supply configurations can be supported, including operation from a single cell AAA or AA battery, and other configurations using externally regulated supplies. System clocking is achieved using a crystal-controlled on-chip oscillator. An external clock can be connected directly, if available. The WM2002 is configured using programmable settings stored in an integrated non-volatile memory. The configuration stored in the OTP memory is enabled automatically at start-up. If required, the WM2002 can also be configured using register control accessed using a two-wire serial control interface.