Audio Codec 3ADC /7 DAC 24-Bit 177-Pin WCSP T/R

The WM8998 is a highly-integrated low-power audio hub codec for smartphones, tablets and other portable audio devices. It is optimised for 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. 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 analog 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.

• Hi-Fi audio hub codec for mobile applications
• Digital audio processing core
  • Fully flexible digital signal routing and mixing
  • Wind noise, side tone 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 analog or 3 digital microphone inputs
  • Single-ended or differential mic/line inputs
• Stereo headphone output driver
  • 28mW into 32? 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 32? 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