Audio Codec 2ADC /4 DAC 24-Bit 72-Pin WCSP T/R

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 analog 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.

• Hi-fi 24-bit 4-channel DAC and 2-channel ADC
• 100dB 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
  • 5.3mW 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 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 (4.511 x 4.023 x 0.7mm)