Datasheet
WM8998 Datasheet
Rev 4.1 | 4 MBJanuary 2017
Discontinued
CodecsWM8998
24-Bit Hi-Fi Audio Hub with 3 A/D Converters, 7 D/A Converters and up to 6 analog or 3 digital microphone inputs
WM8998 Overview
The WM8998 is a highly-integrated, low power audio hub codec designed to optimized the needs of multimedia devices using SLIMbus application processors. 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, and multiple sample rates are supported concurrently. 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 codec also features a stereo line output, stereo 2 W Class D speaker outputs, a dedicated BTL earpiece output, PDM for external speaker amplifiers, and an IEC-60958-3 compatible S/PDIF transmitter. The WM8998 power, clocking and output driver architectures are all designed to maximize battery life in voice, music and standby modes. Low power ‘sleep’ is supported, with configurable wake-up events.
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Product 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, 96 dB SNR microphone input (48 kHz)
7 DACs, 122 dB SNR headphone playback (48 kHz)
Audio inputs
Up to 6 analog or 3 digital microphone inputs
Single-ended or differential mic/line inputs
Stereo headphone output driver
28 mW into 32 Ω load at 0.1% THD+N
6.9 mW typical headphone playback power consumption
Pop suppression functions
132µVRMS noise floor (A-weighted)
Ground-referenced line output driver
Stereo single-ended or Mono differential configuration
Mono BTL earpiece output driver
100 mW into 32 Ω BTL load at 5% THD+N
Stereo (2 x 2 W) 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 8 kHz up to 192 kHz
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 32 kHz
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 1.8 V supply operation
Small W-CSP package, 0.4mm pitch