Multi-channel Codec with Three Digital Audio Interfaces

The WM8994 is a highly integrated, ultra low power hi-fi codec with an integrated stereo Class D and AB speaker driver, and a Class W headphone driver to 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 analog mixing to support a wide 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.

Innovation that Rocks® Cirrus Rocks® Cirrus® Engineered to Rock®


  • Hi-fi 24-bit 4-channel DAC and 2-channel ADC
  • 100 dB SNR during DAC playback (‘A’ weighted)
  • Smart MIC interface
    • Power, clocking and data input for up to four digital MICs
    • High performance analog MIC interface
    • MIC activity detect & interrupt allows processor to sleep
  • 2W stereo (2 x 2W) class D/AB speaker driver
  • Capless Class W headphone drivers
    • Integrated charge pump
    • 5.3 mW 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 allow processor to sleep
    • All standard sample rates from 8 kHz to 96 kHz
  • Active noise reduction circuits
    • DC offset correction removes pops and clicks
    • Ground loop noise cancellation
  • Integrated LDO regulators
  • 72-ball W-CSP package (4.511 x 4.023 x 0.7mm)

Parametric Specifications

DACs 4
ADCs 2
DAC Dynamic Range (dB) 100
ADC Dynamic Range (dB) 95
DAC THD+N (dB) -87
ADC THD+N (dB) -82
Sample Rate (kHz) 8-96
Analog Power Supply (V) 1.8-3.3
Digital Power Supply (V) 1-3.3
Logic Power Supply (V)
Operational Power Consumption (mW) 1.1-21.1
Package 72 WLCSP

Software and Tools

Device Pack for WM8994EV1M

v3.0 : 14047 Kb


v3.12.0.3 : 42.8 Mb


Comprehensive Solutions