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DESCRIPTION
The WM8991 is a highly integrated ultra-low power hi-fi CODEC designed for handsets rich in multimedia features such as GPS, mobile TV, digital audio playback and gaming. Ultra-low power and low noise interfaces to many other audio components in the system are provided. A powerful 1W speaker driver can operate in class D or AB modes, providing total flexibility to the system designer. Low leakage, high PSRR and pop/click suppression enable direct battery connection for the speaker supply. A very highly flexible input configuration supports multiple microphone or line inputs (mono or stereo, single-ended or differential). Four headphone drivers support fully differential headset drive, providing excellent crosstalk performance and bass response, maximising stereo effects, and allowing the removal of large and expensive headphone capacitors. Stereo 24-bit sigma-delta ADCs and DACs provide hi-fi quality audio record and playback, with a flexible digital audio interface supporting most commonly-used clocking schemes. An integrated low power PLL, an alternative DAC interface and TDM support provide additional flexibility. The WM8991 is supplied in very small and thin 5x5mm 65-ball BGA package, ideal for portable systems.
WM8991 Product Brief
Mobile Multimedia CODEC with Dual-Mode Class D/AB Speaker Driver
FEATURES
* * * * DAC SNR 99dB (`A' weighted), THD -84dB at 48kHz, 3.3V ADC SNR 94dB (`A' weighted), THD -82dB at 48kHz, 3.3V Microphone interface (Up to four differential microphones) 1W Speaker driver - 1W into 8 BTL speaker at <0.1% THD - 80dB PSRR @217Hz - <1uA leakage with direct battery connection - Software-selectable class D or AB mode - Filterless connection supported Headphone / ear speaker drivers - 40mW output power into 16 at 3.3V - Fully differential and capless modes supported 4 Mono or stereo differential line outputs Pop-free outputs Powerful GPIO functions Ultra-low power consumption - 5mW voice call - 13mW DAC playback to headphones On-chip PLL provides flexible clocking scheme Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48 kHz 65-ball 5x5mm BGA package
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APPLICATIONS
* * Multimedia phones GPS
WOLFSON MICROELECTRONICS plc
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Product Brief, January 2007, Rev 1.0
Copyright 2007 Wolfson Microelectronics plc
WM8991 WM8991 BENEFITS
* Many new usage scenarios supported - Simultaneous voice call and digital TV reception - Stereo hi-fi record of input or output mixers - Mixed ADC and DAC sample rates Ultra-low power interface to voice codec - Direct connection from received voice input to headphone output for lowest possible power consumption - Microphone amplifier output to voice codec via differential line out - 4mW total power consumption during voice call Audio enhancement - Hi-fi quality ADCs and DACs with low power consumption - 300Hz Voice mode for ADC high pass filter suppresses wind noise and mechanical vibration - Digital sidetone for bio-feedback with reduced noise - High speaker output power - Speaker supply with high supply rejection - Fully differential input and output connections for noise reduction in noisy environment - Pop-free output drivers Flexible input configuration - Up to four differential microphone or line inputs - Many mixing options - Received voice, handset MIC, headset MIC, FM radio or other line inputs all supported - Stereo record path for karaoke or other mixing / re-sampling Low noise microphone bias - Microphone current and short circuit current detect Class D / AB speaker driver - Zero-risk technology for GPS and other EM-sensitive applications - Large power reduction when class D enabled - Software-controlled selection of AB or D mode with no hardware modification required - Can switch dynamically between AB and D modes if required (e.g. when changing usage mode) - Ultra-low leakage and high PSRR allows direct battery connection - Fully internal speaker boost to maximise speaker output volume - Less than 0.1% THD at 1W output Headphone drivers - 4 outputs capable of driving 16 loads such as headphones or ear speaker - Fully differential headphone drive to eliminate ground noise and crosstalk - Capless and AC-coupled modes - 13mW total power during stereo DAC playback Line outputs - Mono or stereo differential outputs - Microphone output to voice codec - Output to additional external speaker driver - Stereo line output Digital interfaces - I2S and DSP/PCM modes, with A-law and -law companding support - Time division multiplexing available on audio interface - Mixed ADC and DAC sample rates - 2 or 3-wire control interface with selectable address GPIO - Up to eight button and accessory detect inputs with pin status readback - Additional DAC interface for connection to a second processor - Alternative master clock - Clock output Small footprint 5x5mm BGA package Ultra-low power PLL
Product Brief
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Product Brief, January 2007, Rev 1.0 2
Product Brief
WM8991 Product Brief
IMPORTANT NOTICE
Wolfson Microelectronics plc ("Wolfson") products and services are sold subject to Wolfson's terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement.
Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current.
Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation.
In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product.
Wolfson's products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the customer for such purposes is at the customer's own risk.
Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of Wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. Any provision or publication of any third party's products or services does not constitute Wolfson's approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner.
Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon.
Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in Wolfson's standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person's own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person.
ADDRESS:
Wolfson Microelectronics plc 26 Westfield Road Edinburgh EH11 2QB United Kingdom
Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com
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Product Brief, January 2007, Rev 1.0 3

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