The WM8976 is a low power codec with integrated pre-amp for a differential mic, and includes drivers for speakers, headphone and differential or stereo line output. External component requirements are reduced as no separate microphone or headphone amplifiers are required.Advanced on-chip digital signal processing includes a five-band equalizer, a mixed-signal automatic level control for the microphone or line input through the A/D converter, as well as a purely digital limiter function for record or playback. Additional digital filtering options are available in the ADC path to provide application filtering such as ’wind noise reduction’. The WM8976 codec can operate as a master or a slave. An internal PLL can generate all required audio clocks for the codec from common reference clock frequencies, such as 12 and 13 MHz. Individual sections of the chip can also be powered down under software control.