Products : Audio Hubs

 

Further information

WM8994 : Multi-Channel CODEC with 3 digital audio interfaces

 
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WM8994 Block Diagram zoom

FEATURES

  • Hi-Fi 24-bit 4-channel DAC and 2-channel ADC
  • 100dB SNR during stereo 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 monitor & interrupt allows processor to sleep 
  • 1W stereo / 2W mono class D/AB speaker driver
  • Capless class W headphone drivers
    - Integrated charge pump
    - 6mW 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™ Mobile 5-band, 6-channel parametric EQ
  • Programmable dynamic range controller
  • Dual FLL provides all necessary clocks
    - Self-clocking modes allows 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 (4.511mm x 4.023mm x 0.7mm)

DESCRIPTION

The WM8994 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 Vbatt and a 1.8V supply, generating all other internal supply rails 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.

Active ground loop noise rejection and DC offset correction help prevent pop noise and suppress ground noise on the headphone outputs.

 

PRICE AND AVAILABILITY

Datasheets

 
 
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