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WM8994 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8994 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 359 page  w WM8994 Multi-Channel Audio Hub CODEC for Smartphones 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 DESCRIPTION The WM8994 [1] is a highly integrated ultra-low power hi-fi CODEC designed for smartphones and other portable devices rich in multimedia features. An integrated stereo class D/AB speaker driver and class W headphone driver minimize power consumption during audio playback. The device requires only two voltage supplies, with all other internal supply rails generated from integrated LDOs. Stereo full duplex asynchronous sample rate conversion and multi-channel digital mixing combined with powerful analogue mixing allow the device to support a huge range of different architectures and use cases. A fully programmable parametric EQ provides speaker compensation and a dynamic range controller can be used in the ADC or DAC paths for maintaining a constant signal level, maximizing loudness and protecting speakers against overloading and clipping. A smart digital microphone interface provides power regulation, a low jitter clock output and decimation filters for up to four digital microphones. A MIC activity detect with interrupt is available. Fully differential internal architecture and on-chip RF noise filters ensure a very high degree of noise immunity. Active ground loop noise rejection and DC offset correction help prevent pop noise and suppress ground noise on the headphone outputs. FEATURES Hi-fi 24-bit 4-channel DAC and 2-channel ADC 100dB SNR during DAC playback (‘A’ weighted) Smart MIC interface - Power, clocking and data input for up to four digital MICs - High performance analogue MIC interface - MIC activity detect & interrupt allows processor to sleep 2W stereo (2 x 2W) class D/AB speaker driver Capless Class W headphone drivers - Integrated charge pump - 5.3mW total power for DAC playback to headphones 4 Line outputs (single-ended or differential) BTL Earpiece driver Digital audio interfaces for multi-processor architecture - Asynchronous stereo duplex sample rate conversion - Powerful mixing and digital loopback functions ReTune TM Mobile 5-band, 6-channel parametric EQ Programmable dynamic range controller Dual FLL provides all necessary clocks - Self-clocking modes allow processor to sleep - All standard sample rates from 8kHz to 96kHz Active noise reduction circuits - DC offset correction removes pops and clicks - Ground loop noise cancellation Integrated LDO regulators 72-ball W-CSP package (4.511 x 4.023 x 0.7mm) APPLICATIONS Smartphones and music phones Portable navigation Tablets eBooks Portable Media Players |
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