DESCRIPTION
●The WM8904 is a high performance ultra-low power stereo CODEC optimised for portable audio applications.
●The device features stereo ground-referenced headphone amplifiers using the Wolfson ‘Class-W’ amplifier techniques incorporating an innovative dual-mode charge pump architecture to optimise efficiency and power consumption during playback. The ground-referenced headphone and line outputs eliminate AC coupling capacitors, and both outputs include common mode feedback paths to reject ground noise.
●FEATURES
●3.0mW quiescent power consumption for DAC to headphone playback
●DAC SNR 96dB typical, THD -86dB typical
●ADC SNR 91dB typical, THD -80dB typical
●2.4mW quiescent power consumption for analogue bypass playback
●Control write sequencer for pop minimised start-up and shutdown
●Single register write for default start-up sequence
●Integrated FLL provides all necessary clocks
● - Self-clocking modes allow processor to sleep
● - All standard sample rates from 8kHz to 96kHz
●Stereo digital microphone input
●3 single ended inputs per stereo channel
●1 fully differential mic / line input per stereo channel
●Digital Dynamic Range Controller (compressor / limiter)
●Digital sidetone mixing
●Ground-referenced headphone driver
●Ground-referenced line outputs
●32-pin QFN package (4 x 4mm, 0.4mm pitch)
●36-ball WLCSP package (2.6 x 2.5mm, 6 x 6 ball grid, 0.4mm pitch)
