WM8985 w Multimedia CODEC with Class D Headphone and Line Out DESCRIPTION FEATURES Stereo CODEC: The WM8985 is a low power, high quality, feature-rich stereo DAC SNR 98dB, THD -84dB (A weighted 48kHz) CODEC designed for portable multimedia applications that ADC SNR 92.5dB, THD -83dB (A weighted 48kHz) require low power consumption and high quality audio. Headphone driver with capless option The device integrates preamps for stereo differential mics, and - 40mW/channel output power into 16 / 3.3V AVDD2 includes class D and class AB drivers for headphone and - Class D headphone driver differential or stereo line output. External component - Class AB headphone / line Driver requirements are reduced as no separate microphone or - PSRR 70dB at 217Hz headphone amplifiers are required. Stereo, mono or differential line output Advanced DSP features include a 5-band equaliser, an Mic Preamps: ALC/limiter for the microphone or line input through the ADC Stereo differential or mono microphone interfaces and a digital playback limiter. Additional digital filtering options Programmable preamp gain are available in the ADC path, to cater for application filtering Pseudo differential inputs with common mode rejection such as wind noise reduction and a programmable notch filter. Programmable ALC / Noise Gate in ADC path Highly flexible mixers enable many new application features, Low-noise bias supplied for electret microphones with the option to record and playback any combination of voice, line inputs and digital audio such as FM Radio or MP3. Other Features: The WM8985 digital audio interface can operate in master or Enhanced 3-D function for improved stereo separation slave mode, while an integrated PLL provides flexible clocking Digital playback limiter schemes. 5-band Equaliser (record or playback) Programmable ADC High Pass Filter (wind noise reduction) The WM8985 operates at analogue supply voltages from 2.5V to Programmable ADC Notch Filter 3.3V, although the digital core can operate at voltages down to Aux inputs for stereo analog input signals or beep 1.71V to save power. Additional power management control PLL supporting various clocks between 8MHz-50MHz enables individual sections of the chip to be powered down Sample rates supported (kHz): 8, 11.025, 16, 12, 16, 22.05, under software control. 24, 32, 44.1, 48 Low power, low voltage 2.5V to 3.6V analogue supplies 1.71V to 3.6V digital supplies 5x5mm 32-lead QFN package APPLICATIONS Portable audio player / FM radio Multimedia Mobile Handsets Production Data, February 2013, Rev 4.7 WOLFSON MICROELECTRONICS plc Copyright 2013 Wolfson Microelectronics plc WM8985 Production Data BLOCK DIAGRAM PD, Rev 4.7, February 2012 w 2