WM8904CGEFL/RV

Overview

The WM8904CGEFL/RV is a high-performance ultra-low power stereo CODEC optimized for portable audio applications. It features stereo ground-referenced headphone amplifiers using Wolfson Class-W techniques with a dual-mode charge pump architecture to optimize efficiency and power consumption during playback. The device includes integrated FLL, digital dynamic range controller, and ReTune Mobile 5-band parametric equalizer. It supports standard sample rates from 8kHz to 96kHz and operates directly from a single 1.8V switched supply. The component is housed in a 32-pin QFN package (4 x 4mm, 0.4mm pitch) and offers DAC SNR of 96dB typical and ADC SNR of 91dB typical.

Feature Summary

• Ground-referenced Class-W headphone and line outputs eliminate AC coupling capacitors and include common mode feedback paths to reject ground noise.
• Integrated control write sequencer minimizes pops and clicks via SilentSwitch technology during start-up and shutdown sequences.
• Digital Dynamic Range Controller provides compression and limiting capabilities with anti-clip and quick release features for handling impulsive noises.
• ReTune Mobile 5-band parametric equalizer allows optimization of speaker characteristics through fully programmable coefficients.

Applications

• Portable multimedia players
• Multimedia handsets
• Handheld gaming devices
• Wireless headsets
• Mobile internet devices

Procurement Notes

Verify the specific ordering suffix RV indicates tape and reel packaging when sourcing components. Confirm the moisture sensitivity level MSL3 rating aligns with your facility's storage and reflow soldering process requirements. Ensure the lead-free specification meets environmental compliance standards for your target market. Cross-reference the peak soldering temperature limit of 260°C with your manufacturing equipment capabilities to prevent thermal damage during assembly.

Selection Notes

Select this component for designs requiring low quiescent power consumption, specifically 3.0mW for DAC to headphone playback. Consider the 32-pin QFN package dimensions if board space is constrained. Verify that the required input configurations match the available single-ended and differential inputs per channel. Ensure the system clocking strategy accommodates the integrated FLL for generating necessary clocks from external sources.

Part Context

The WM8904 belongs to the Cirrus Logic WM8904 series of audio codecs. It is part of a family designed for portable audio applications, sharing architectural similarities with other models like the WM8903 and WM8912. The CGEFL/RV designation specifies the commercial temperature range, QFN package type, and reel packaging format within this product line.

Replacement Considerations

Direct pin-compatible replacements within the same package are limited. Evaluate the WM8903 or WM8912 for functional equivalence, noting potential differences in package options or specific feature sets. Verify register compatibility and software driver adjustments if migrating between different models in the series.

FAQ

How does the WM8904 handle ground noise rejection?

Both the ground-referenced headphone and line outputs include common mode feedback paths specifically designed to reject ground noise.

What is the purpose of the Control Write Sequencer?

The integrated control write sequencer pre-loads and executes audio path setup sequences to reduce software driver development and minimize pops and clicks via SilentSwitch technology.

Can the WM8904 operate without an external crystal oscillator?

Yes, the integrated Frequency Locked Loop (FLL) can generate all necessary clocks from a wide range of external clocks, allowing self-clocking modes where the processor can sleep.