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WM8904 Ultra-Low Power, High-Performance Stereo Codec

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WM8904 Ultra-Low Power, High-Performance Stereo Codec

Cirrus Logic's WM8904 features ground-referenced headphone amplifiers with a dual-mode charge pump architecture

Cirrus Logic's WM8904 is a high-performance, ultra-low power stereo codec featuring stereo ground-referenced headphone amplifiers that incorporate a dual-mode charge pump architecture to optimize efficiency and power consumption during playback. The ground-referenced headphone and line outputs eliminate AC coupling capacitors, and both outputs include common mode feedback paths to reject ground noise. Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimize pops and clicks. The analog input stage can be configured for single-ended, or differential inputs. Up to three stereo microphone or line inputs may be connected. The input impedance is constant with PGA gain setting. A stereo digital microphone interface with a choice of two inputs is provided.

A dynamic range controller (DRC) provides compression and level control to support a wide range of portable recording applications. Anti-clip and quick release features offer excellent performance in the presence of loud impulsive noises. ReTune™ Mobile 5-band parametric equalizer with fully programmable coefficients is integrated for optimization of speaker characteristics. Programmable dynamic range control is also available for maximizing loudness, protecting speakers from clipping and preventing premature shutdown due to battery droop.

Block Diagram

Features
  • Ideal for playback and record
    • High-performance, ultra-low power stereo codec with stereo ground-referenced headphone amplifiers
    • Advanced DRC to enhance audio performance and preventing distortion
    • Quick release feature to enhance the intelligibility of recorded sound in the presence of loud impulse noises
  • Maintains constant voice and record levels for better intelligibility
    • Analog input stage can be configured for single-ended or differential inputs
    • Stereo digital microphone interface provided to connect up to 4 DMICs
  • Simplifies software development, improves time to market
    • Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimize pops and clicks
    • ReTune Mobile 5-band parametric equalizer with fully programmable coefficients is integrated for optimization of speaker characteristics
  • Reduces external component count
    • Ground referenced output eliminates the need for large DC blocking headphone capacitors
  • Two available packages
    • 4 mm x 4 mm QFN and a 36 CSP options
Applications
  • Smart remotes
  • Wireless and wired headsets
  • Multimedia handsets
  • Handheld gaming
  • Bluetooth® speakers
  • Mobile internet devices
  • Netbooks
  • MP3 players
  • Wearables/smart bands