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WM8998 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8998 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 307 page  w WM8998 High Performance Audio Hub CODEC WOLFSON MICROELECTRONICS plc Production Data, October 2014, Rev 4.0 [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 2014 Wolfson Microelectronics plc DESCRIPTION The WM8998[1] is a highly-integrated low-power audio hub CODEC for smartphones, tablets and other portable audio devices. It is optimised for use in multimedia devices where the audio processing requirements are implemented on the host applications processor. The WM8998 digital core combines fixed-function signal processing blocks with a fully-flexible, all-digital audio mixing and routing engine, for extensive use-case flexibility. Signal processing blocks include filters, EQ, dynamics processors and sample rate converters. A SLIMbus interface supports multi-channel audio paths and host control register access. Multiple sample rates are supported concurrently via the SLIMbus interface. Three further digital audio interfaces are provided, each supporting a wide range of standard audio sample rates and serial interface formats. Automatic sample rate detection enables seamless wideband/narrowband voice call handover. The stereo headphone driver provides ground-referenced outputs, with noise levels as low as 1μVRMS for hi-fi quality line or headphone output. The CODEC also features a stereo line output, stereo 2W Class-D speaker outputs, a dedicated BTL earpiece output, PDM for external speaker amplifiers, and an IEC-60958-3 compatible S/PDIF transmitter. A signal generator for controlling haptics devices is included; vibe actuators can connect directly to the Class- D speaker output, or via an external driver on the PDM output interface. All inputs, outputs and system interfaces can function concurrently. The WM8998 supports up to six analogue mic/line inputs, and up to three PDM digital inputs. The input multiplexers support up to three signal paths. Microphone activity detection with interrupt is available. A smart accessory interface supports most standard 3.5mm accessories. Impedance sensing and measurement is provided for external accessory and push-button detection. The WM8998 power, clocking and output driver architectures are all designed to maximise battery life in voice, music and standby modes. Low-power ‘Sleep’ is supported, with configurable wake-up events. The WM8998 is powered from a 1.8V external supply. A separate supply is required for the Class D speaker drivers (typically direct connection to 4.2V battery). Two integrated FLLs provide support for a wide range of system clock frequencies. The WM8998 is configured using the I2C or SLIMbus interfaces. The fully-differential internal analogue architecture, minimal analogue signal paths and on-chip RF noise filters ensure a very high degree of noise immunity. FEATURES • Hi-Fi audio hub CODEC for mobile applications • Digital audio processing core - Fully flexible digital signal routing and mixing - Wind noise, sidetone and other programmable filters - Dynamic Range Control (compressor, limiter) - Fully parametric EQs - Low-pass / High-pass filters • Multi-channel asynchronous sample rate conversion • Integrated multi-channel 24-bit hi-fi audio hub CODEC - 3 ADCs, 96dB SNR microphone input (48kHz) - 7 DACs, 122dB SNR headphone playback (48kHz) • Audio inputs - Up to 6 analogue or 3 digital microphone inputs - Single-ended or differential mic/line inputs • Stereo headphone output driver - 28mW into 32Ω load at 0.1% THD+N - 6.9mW typical headphone playback power consumption - Pop suppression functions - 1µVRMS noise floor (A-weighted) • Ground-referenced line output driver - Stereo single-ended or Mono differential configuration • Mono BTL earpiece output driver - 100mW into 32Ω BTL load at 5% THD+N • Stereo (2 x 2W) Class D speaker output drivers - Direct drive of external haptics vibe actuators • Two-channel digital speaker (PDM) output interface • IEC-60958-3 compatible S/PDIF transmitter • SLIMbus audio and control interface • 3 full digital audio interfaces - Standard sample rates from 8kHz up to 192kHz - TDM support on all AIFs - 6 channel input and output on AIF1 and AIF2 • Flexible clocking, derived from MCLKn, BCLKn or SLIMbus • 2 low-power FLLs support reference clocks down to 32kHz • Advanced accessory detection functions - Low-power standby mode and configurable wake-up • Configurable functions on 5 GPIO pins • Integrated LDO regulators and charge pumps • Support for single 1.8V supply operation • Small W-CSP package, 0.4mm pitch APPLICATIONS • Smartphones and Multimedia handsets • Tablets and Mobile Internet Devices (MID) |
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