The WM8918 is an ultra low power stereo digital/analog converter (DAC) with integrated ground-referenced headphone amplifiers that incorporate a dual-mode charge pump to optimize efficiency and power consumption during playback. The ground-referenced outputs eliminate headphone coupling capacitors and the outputs include common mode feedback paths to reject ground noise. Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimize pops and clicks. The analog input stage can be configured for single ended or differential inputs, and up to three stereo microphone or line inputs may be connected.
Low 3.8mW quiescent power consumption for DAC to headphone playback
Low 2.4mW quiescent power consumption for analog bypass playback
Integrated FLL provides all necessary clocks
Self-clocking modes allow processor to sleep
All standard sample rates from 8 to 96kHz
Stereo digital microphone input
Three single-ended inputs per stereo channel
One fully differential mic/line input per stereo channel
Digital dynamic range controller (compressor /limiter)
