DESCRIPTION
●The WM8903 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 outputs eliminate headphone coupling capacitors. Both headphone and line
●outputs include common mode feedback paths to reject ground noise.
●FEATURES
●4.5mW power consumption for DAC to headphone playback
●DAC SNR 96dB typical, THD -86dB typical
●ADC SNR 92dB typical, THD -80dB typical
●Control 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
●Stereo differential line driver for direct interface to WM9001speaker driver
●40-pin QFN package (5x5mm)
