DESCRIPTION
The WM8991 is a highly integrated ultra-low power hi-fi codec designed for handsets rich in multimedia features such as mobile TV, digital audio playback and gaming. Ultra-low power and low noise interfaces to many other audio components in the system are provided.

FEATURES
   DAC SNR 99dB (‘A’ weighted), THD -84dB at 48kHz, 3.3V
   ADC SNR 94dB (‘A’ weighted), THD -82dB at 48kHz, 3.3V
   Microphone interface (Up to four differential microphones)
   1W Speaker driver
      - 1W into 8Ω BTL speaker at <0.1% THD
      - 80dB PSRR @217Hz
      - <1uA leakage with direct battery connection
      - Software-selectable class D or AB mode
      - Filterless connection supported
      - Pop/Click suppression
   Headphone / ear speaker drivers
      - 40mW output power into 16Ω at 3.3V
      - Fully differential and capless modes supported
      - Pop/Click suppression
   4 Mono or stereo differential line outputs
   Powerful GPIO functions
   Ultra-low power consumption
      - 8.3mW analogue voice call
      - 13.7mW DAC playback to headphones
   On-chip PLL provides flexible clocking scheme
   Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48kHz
   65-ball 5x5mm BGA package

APPLICATIONS
   Multimedia phones
   GPS