The WM8985 is a low power stereo codec designed for portable multimedia applications requiring the lowest possible power consumption and high quality audio. The device integrates pre-amps for stereo differential mics and includes Class D and Class AB drivers for headphone and differential or stereo line output. Advanced DSP features include a five-band equalizer and 3D enhancement, an ALC/limiter for the microphone or line input through the A/D converter and a digital playback limiter. Other programmable filtering functions are available in the ADC path. Highly flexible mixing capabilities enable many new application features, with the option to record and playback any combination of voice, line inputs and digital audio. The WM8985 digital audio interface can operate in master or slave mode, while an integrated PLL provides support for all commonly used clocking schemes in portable devices.
Stereo Codec:
DAC SNR 98 dB, THD -84 dB (‘A’ weighted at 48kHz)
ADC SNR 92.5 dB, THD -83 dB (‘A’ weighted at 48kHz)
Headphone driver with ‘capless’ option
40mW/channel output power into 16ohm/3.3V AVDD2
Class D headphone driver
Class AB headphone/line driver
PSRR 70 dB at 217Hz
Stereo, mono or differential line output
Mic Preamps:
Stereo differential or mono microphone interfaces
Programmable preamp gain
Pseudo-differential inputs with common mode rejection
Programmable ALC/noise gate in ADC path
Low-noise bias supplied for electret microphones
Other Features:
Enhanced 3-D function for improved stereo separation
Digital playback limiter
5-band equalizer (record or playback)
Programmable ADC high pass filter (wind noise reduction)
Programmable ADC notch filter
Aux inputs for stereo analog input signals or ‘beep’
