An integrated charge pump provides a ground referenced output which removes the need for DC-blocking capacitors on the headphone outputs, and uses the Cirrus Logic Class W amplifier techniques - incorporating an innovative dual-mode charge pump architecture - to optimize efficiency and power consumption during playback. A DC Servo is used to reduce DC ground offsets. This improves power consumption and minimizes pops and clicks.

Stereo Class D speaker drivers provide 2W per channel into 4W BTL loads, with a 5V supply. Low leakage, excellent PSRR and pop/click suppression mechanisms also allow direct battery connection to the speaker supply. Flexible speaker boost settings allow speaker output power to be maximized while minimizing other analog supply currents. Control sequences for audio path setup can be pre-loaded and executed by an integrated sequencer to reduce software driver development and eliminate pops and clicks via Cirrus Logic’s SilentSwitch™ technology.

Flexible input configuration: four stereo inputs or eight mono inputs on Left or Right ADC, with a complete analog (four single-ended stereo inputs) and digital microphone interface. External component requirements are drastically reduced as no separate microphone, speaker or headphone amplifiers are required. Advanced on-chip digital signal processing performs automatic level control for the microphone or line input.

Stereo 24-bit Delta Sigma ADCs and DACs are used with low power over-sampling digital interpolation and decimation filters and a flexible digital audio interface.

A programmable audio enhancement DSP is included with multiple preset algorithms. Virtual Surround Sound widens the stereo speaker audio image, HD Bass enhances low frequencies, and ReTune™ flattens the frequency response of the speaker or microphone path. A configurable DSP includes additional functions such as 3D widening for recording, a 5-band parametric EQ and Dynamic Range Controller.

Two high performance PLLs and one Frequency Locked Loop (FLL) are integrated to enable the user to clock a full audio system. The WM8962/62B operate at analog supply voltages down to 1.7V, although the digital supplies can operate at voltages down to 1.62V to save power. The speaker supply can operate at up to 5.5V. Unused functions can be disabled using software control to save power.

The WM8962/62B are supplied in a very small W-CSP package, ideal for use in hand-held and portable systems.