WM8994 w Multi-Channel Audio Hub CODEC for Smartphones DESCRIPTION FEATURES 1 Hi-fi 24-bit 4-channel DAC and 2-channel ADC The WM8994 is a highly integrated ultra-low power hi-fi 100dB SNR during DAC playback (A weighted) CODEC designed for smartphones and other portable devices Smart MIC interface rich in multimedia features. - Power, clocking and data input for up to four digital MICs An integrated stereo class D/AB speaker driver and class W - High performance analogue MIC interface headphone driver minimize power consumption during audio - MIC activity detect & interrupt allows processor to sleep playback. 2W stereo (2 x 2W) class D/AB speaker driver Capless Class W headphone drivers The device requires only two voltage supplies, with all other - Integrated charge pump internal supply rails generated from integrated LDOs. - 5.3mW total power for DAC playback to headphones Stereo full duplex asynchronous sample rate conversion and 4 Line outputs (single-ended or differential) multi-channel digital mixing combined with powerful analogue BTL Earpiece driver mixing allow the device to support a huge range of different Digital audio interfaces for multi-processor architecture architectures and use cases. - Asynchronous stereo duplex sample rate conversion - Powerful mixing and digital loopback functions A fully programmable parametric EQ provides speaker TM ReTune Mobile 5-band, 6-channel parametric EQ compensation and a dynamic range controller can be used in Programmable dynamic range controller the ADC or DAC paths for maintaining a constant signal level, Dual FLL provides all necessary clocks maximizing loudness and protecting speakers against - Self-clocking modes allow processor to sleep overloading and clipping. - All standard sample rates from 8kHz to 96kHz Active noise reduction circuits A smart digital microphone interface provides power regulation, - DC offset correction removes pops and clicks a low jitter clock output and decimation filters for up to four - Ground loop noise cancellation digital microphones. A MIC activity detect with interrupt is Integrated LDO regulators available. 72-ball W-CSP package (4.511 x 4.023 x 0.7mm) Fully differential internal architecture and on-chip RF noise filters ensure a very high degree of noise immunity. Active ground loop APPLICATIONS noise rejection and DC offset correction help prevent pop noise Smartphones and music phones and suppress ground noise on the headphone outputs. Portable navigation Tablets eBooks Portable Media Players WOLFSON MICROELECTRONICS plc Production Data, April 2012, Rev 4.4 1 This product is protected by Patents US 7,622,984, US 7,626,445,US 7,765,019 and GB 2,432,765 Copyright 2012 Wolfson Microelectronics plc WM8994 Production Data TABLE OF CONTENTS DESCRIPTION ....................................................................................................... 1 FEATURES ............................................................................................................ 1 APPLICATIONS ..................................................................................................... 1 TABLE OF CONTENTS ......................................................................................... 2 BLOCK DIAGRAM ................................................................................................ 6 PIN CONFIGURATION .......................................................................................... 7 ORDERING INFORMATION .................................................................................. 7 PIN DESCRIPTION ................................................................................................ 8 ABSOLUTE MAXIMUM RATINGS ...................................................................... 11 RECOMMENDED OPERATING CONDITIONS ................................................... 12 THERMAL PERFORMANCE ............................................................................... 13 ELECTRICAL CHARACTERISTICS ................................................................... 14 INPUT SIGNAL LEVEL .................................................................................................. 14 INPUT PIN RESISTANCE .............................................................................................. 15 PROGRAMMABLE GAINS ............................................................................................. 17 OUTPUT DRIVER CHARACTERISTICS ....................................................................... 18 ADC INPUT PATH PERFORMANCE ............................................................................. 19 DAC OUTPUT PATH PERFORMANCE ......................................................................... 20 BYPASS PATH PERFORMANCE .................................................................................. 23 MULTI-PATH CROSSTALK ........................................................................................... 25 DIGITAL INPUT / OUTPUT ............................................................................................ 27 DIGITAL FILTER CHARACTERISTICS ......................................................................... 27 MICROPHONE BIAS CHARACTERISTICS ................................................................... 28 MISCELLANEOUS CHARACTERISTICS ...................................................................... 29 TERMINOLOGY ............................................................................................................. 30 TYPICAL PERFORMANCE ................................................................................. 31 TYPICAL POWER CONSUMPTION .............................................................................. 31 TYPICAL SIGNAL LATENCY ......................................................................................... 32 SPEAKER DRIVER PERFORMANCE ........................................................................... 33 SIGNAL TIMING REQUIREMENTS .................................................................... 34 SYSTEM CLOCKS & FREQUENCY LOCKED LOOP (FLL) .......................................... 34 AUDIO INTERFACE TIMING ......................................................................................... 35 DIGITAL MICROPHONE (DMIC) INTERFACE TIMING .................................................................................................. 35 DIGITAL AUDIO INTERFACE - MASTER MODE ........................................................................................................... 36 DIGITAL AUDIO INTERFACE - SLAVE MODE ............................................................................................................... 37 DIGITAL AUDIO INTERFACE - TDM MODE .................................................................................................................. 38 CONTROL INTERFACE TIMING ................................................................................... 39 2-WIRE (I2C) CONTROL MODE ..................................................................................................................................... 39 3-WIRE (SPI) CONTROL MODE ..................................................................................................................................... 40 4-WIRE (SPI) CONTROL MODE ..................................................................................................................................... 41 DEVICE DESCRIPTION ...................................................................................... 42 INTRODUCTION ............................................................................................................ 42 ANALOGUE INPUT SIGNAL PATH ............................................................................... 44 MICROPHONE INPUTS .................................................................................................................................................. 45 MICROPHONE BIAS CONTROL .................................................................................................................................... 45 MICROPHONE CURRENT DETECT .............................................................................................................................. 46 LINE AND VOICE CODEC INPUTS ................................................................................................................................ 47 INPUT PGA ENABLE ...................................................................................................................................................... 48 INPUT PGA CONFIGURATION ...................................................................................................................................... 48 INPUT PGA VOLUME CONTROL ................................................................................................................................... 49 INPUT MIXER ENABLE ................................................................................................................................................... 52 PD, April 2012, Rev 4.4 w 2