The WM8946 is a highly integrated low power hi-fi codec designed for portable devices such as digital still cameras. Up to six analog inputs may be connected, and a two-channel digital microphone interface is also provided. Flexible output mixing options support single-ended and differential configurations, with outputs derived from the digital audio paths or from analog bypass paths. Twin stereo outputs or stereo line and mono BTL headphone/speaker drive may be supported. Flexible digital mixing and powerful DSP functions are available. Programmable filters and other processes may be applied to the ADC and DAC signal paths simultaneously. The DSP functions include 3D-stereo enhancement, five notch filters, five-band EQ, dynamic range control and the Cirrus Logic ReTune™ feature. The ReTune™ feature is a sophisticated digital filter that can compensate for imperfect characteristics of the housing, loudspeaker or microphone components in an application. The ReTune™ algorithm can provide acoustic equalization and selective phase (delay) control of specific frequency bands. The WM8946 is controlled via a I²C or SPI interface. Additional functions include Digital beep generator, video buffer, programmable GPIO functions, Frequency Locked Loop (FLL) for flexible clocking support and integrated LDO for low noise supply regulation. The WM8946 is supplied in 36-ball W-CSP package, ideal for portable systems.