WFN190_WM8985_aw*.qxp 11/1/07 16:05 Page 1 WM8985 Multimedia CODEC with Class AB and D Headphone Drivers World’s first Class AB-to-D Switchable CODEC. The WM8985 provides high performance audio while significantly increasing battery life for multimedia mobile phones, portable and video players and Bluetooth headsets. The device is a low power, high quality, feature-rich stereo CODEC designed for portable multimedia applications requiring the lowest possible power consumption and high quality audio. On-board digital signal processing is used to implement solutions for wind noise reduction, speaker equalisation and 3D enhancement. DGND DBVDD DCVDD AGND2 AVDD2 WM8985 AUXL OUT4 L2/ GPIO2 ADC DIGITAL FILTERS LIN L ADC LIP Volume Hi-Fi DAC DIGITAL FILTERS 5 Band EQ OUT3 Stereo, mono or differential line outputs L DAC Volume STEREO MICROPHONE INTERFACE LOUT1 3D Enhance INPUT MIXERS 5 Band EQ OUTPUT MIXERS ALC/Limiter 3D Enhance RIN R ADC RIP Wind noise filter Playback limiter Programmable IIR notch filter ROUT1 Stereo Line or Headphone Outputs R DAC Switchable Class D / AB Headphone ROUT2 Outputs R2/ GPIO3 LOUT2 AUXR DIGITAL AUDIO INTERFACE CONTROL INTERFACE BCLK DACDAT LRC ADCDAT MODE SCLK SDIN CSB/GPIO1 VMID AVDD1 AGND1 PLL MCLK ADCREF, DACREF MICBIAS PRODUCT BENEFITS TARGET APPLICATIONS High performance stereo audio Multimedia mobile phones Greatly increased battery life; headphone amplifier efficiency > 70% Portable audio and video players Reduced external component requirements Bluetooth headsets Integrated DSP including noise filtering, equalization and 3D enhancement Highly flexible audio mixing capability WFN190_WM8985_aw*.qxp 11/1/07 16:05 Page 2 WM8985 Multimedia CODEC with Class AB and D Headphone Drivers PRODUCT FEATURES PRODUCT DETAILS DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz) EXTENDED BATTERY LIFE ADC SNR 92.5dB, THD -75dB (‘A’ weighted @ 48kHz) Dynamically selectable Class D or AB headphone drivers 40mW headphone output power into 16Ω load Pop and click suppression The WM8985 allows the user to dynamically select between either Class D or Class AB amplifiers for the headphone output. The Class D mode significantly reduces power consumption and enhances the battery life in many applications. The WM8985 operates at analogue supply voltages from 2.5V to 3.6V, although the digital core can operate at voltages down to 1.71V to save power. Additional power management control enables individual sections of the chip to be powered down under software control. Stereo differential or mono microphone interfaces REDUCED COMPONENT COUNT Programmable preamp gain External component requirements are reduced as no separate microphone or headphone amplifiers are required. Programmable ALC and noise gate in ADC path ENHANCED AUDIO QUALITY AND MIXING CAPABILITY Low-noise bias supplied for electret microphones 3D stereo enhancement Digital playback limiter 5-band equaliser (record or playback) Advanced DSP features include a 5-band equaliser and 3D enhancement, an ALC/limiter for the microphone or line input through the ADC 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. WM8985 POWER CONSUMPTION SAVINGS Programmable high pass and notch filter (Measured with AVDD = 3.3V, DVDD = 1.8V, 30Ω headphone load) 45 40 2.5V to 3.6V analogue supplies 35 Current (mA) 50 PLL supporting various clocks between 8MHz-50MHz 30 1.71V to 3.6V digital supplies 25 5x5mm 32-lead QFN package 20 15 Excellent EMI performance 10 5 0 -45 -40 -35 Headphone volume (dB) -30 -25 -20 -15 Class AB -10 Class D -5 0 Current Saving WORLD HEADQUARTERS USA SALES OFFICE JAPAN SALES OFFICE ASIA PACIFIC SALES OFFICE Wolfson Microelectronics plc Wolfson Microelectronics, Inc. Wolfson Microelectronics plc Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh 16875 West Bernardo Drive Suite 280 23F Sky Building 2-19-12 Takashima San Diego EH11 2QB United Kingdom CA 92127 USA Nishi-ku Yokohama, 220-0011 Japan 2F, No.39, Alley 20 Lane 407, Sec. 2 Tiding Boulevard, NeiHu District Taipei 114 Taiwan t: +44 (0) 131 272 7000 f: +44 (0) 131 272 7001 e: [email protected] t: +1 (0) 858 676 5090 f: +1 (0) 858 676 0484 e: [email protected] t: +81 (0) 45 440 1230 f: +81 (0) 45 440 1231 e: [email protected] t: +886 (0) 2 875 11600 f: +886 (0) 2 875 10201 e: [email protected] © COPYRIGHT 2006, WOLFSON MICROELECTRONICS PLC. and the wave logo are a registered trademark of Wolfson Microelectronics plc. All other trademarked names, whether indicated as such or not, are the property of their respective owners. The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. 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