HD Audio Hub with Slimbus and Three I²S Interfaces

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 2W 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.

Technologies

Portable Codecs

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 (48kHz)
    • 7 DACs, 122 dB SNR headphone playback (48kHz)
  • Audio inputs
    • Up to 6 analog 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
    • 132µVRMS 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

Parametric Specifications

DACs 7
ADCs 3
DAC THD+N (dB) -81
ADC THD+N (dB) -81
Sample Rate (kHz) 192
Analog Power Supply (V) 1.7-5.5
Supply Current (µA) 1.14-3.74
Package 117 WLCSP

Technical Documents

WM8998 Product Datasheet

Jan 24, 2017, v4.1 : 3.8 Mb

WM8998 Product Brief

Jun 1, 2014, Rev 3.0 : 487 Kb

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Comprehensive Solutions