WM8994ECS/R

Overview

The WM8994ECS/R is a highly integrated ultra-low power hi-fi CODEC designed for smartphones and portable multimedia devices. It features a 24-bit resolution with a maximum conversion rate of 96 kHz. The device includes two ADCs and four DACs, supporting stereo full-duplex asynchronous sample rate conversion. It operates on two voltage supplies ranging from 950 mV to 2 V and 1.62 V to 3.6 V. The component utilizes a 72-ball W-CSP package (WCSP-72) and supports 2-Wire, 3-Wire, and 4-Wire interfaces. It achieves an SNR of 94 dB for the ADC and 100 dB for the DAC.

Feature Summary

• Integrated stereo Class D/AB speaker driver and Class W headphone driver minimize power consumption during playback.
• Smart digital microphone interface provides power regulation, low jitter clock output, and decimation filters for up to four digital microphones.
• Fully differential internal architecture with on-chip RF noise filters ensures high noise immunity and active ground loop noise rejection.
• Programmable dynamic range controller and parametric EQ allow for speaker compensation and signal level maintenance.

Applications

• Smartphones and music phones
• Portable navigation devices
• Tablets
• eBooks
• Portable media players

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct packaging and revision status. Confirm RoHS compliance details directly from the datasheet before procurement. Ensure the required voltage supply rails match the specified operating ranges for both analog and digital sections.

Selection Notes

Select this component when a multi-channel audio hub with integrated speaker and headphone drivers is required. The dual FLL and asynchronous SRC support complex multi-processor architectures. Verify that the 72-ball W-CSP package dimensions fit the target PCB layout constraints.

Part Context

The WM8994 belongs to Cirrus Logic's mobile multimedia codec family. It is engineered specifically for applications requiring high-fidelity audio in space-constrained portable devices. The integration of multiple digital interfaces and powerful analog mixing capabilities distinguishes it from simpler stereo codecs.

Replacement Considerations

WM8993ECS/RV

FAQ

How many digital microphone channels does the WM8994 support?

The device supports up to four digital microphone channels through its smart digital microphone interface.

What is the purpose of the DC offset correction feature?

DC offset correction removes pops and clicks from the output and helps suppress ground noise on the headphone outputs.

Does the WM8994 include internal voltage regulators?

Yes, the device includes integrated LDO regulators that generate all internal supply rails from the two main external voltage supplies.