WM8904ECS/R - Ultra-Low-Power Stereo Codec | Cirrus Logic
部品番号: WM8904ECS/R ✓ 生産中WM8904ECS/R 概要
An audio codec belongs to the broader signal-chain hierarchy of audio interface ICs, mixed-signal converters, and portable audio semiconductors. Its primary role is to translate between digital audio data and analog headphone or line-level signals while providing the analog amplification and output biasing required by portable playback equipment. The WM8904 combines those functions to reduce the number of separate external audio components and simplify portable-device layouts.
The WM8904's distinguishing features include stereo ground-referenced headphone amplification, a dual-mode charge-pump implementation, ground-referenced line outputs, common-mode feedback, and an ultra-low-power design focus. Ground-referenced outputs can simplify headphone-driver integration because their output bias is centered near the analog ground reference rather than requiring large output coupling capacitors. The dual-mode charge pump supports the internal headphone-output biasing and power-management functions while targeting efficient operation during playback.
Common-mode feedback paths in the headphone and line-output stages are intended to reduce sensitivity to ground noise, which is important in compact systems where headphone wiring, microphone circuitry, switching converters, and digital logic can share a constrained board area. The 36-WCSP package also supports compact PCB layouts, although its 2.65 mm by 2.53 mm footprint requires careful assembly planning, exposed-pad inspection, and adequate acoustic or mechanical clearance for reliable production.
Typical uses include portable music players, personal audio devices, smartphones, portable navigation equipment, compact Bluetooth speakers, and other battery-powered products that combine digital audio processing with analog headphone or line outputs. The device is also relevant to portable audio subsystems where low power, short signal paths, and reduced external component count are primary design priorities.
When designing around the WM8904ECS/R, verify the complete electrical limits, supported digital audio interfaces, clock requirements, analog input configuration, and recommended decoupling directly in the manufacturer datasheet. Keep analog input and output routes away from noisy switching nodes, provide the required supply and reference components, and confirm that the exposed-pad layout and assembly process meet the package's thermal and solderability requirements. This page consolidates verified package, distributor, and manufacturer information with application-oriented engineering guidance rather than estimating unavailable electrical parameters.
ドロップイン代替品: WM8904ECS/R — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストWM8904ECS/R 最大定格＆電気的特性
| Device Type | Stereo audio codec |
| Primary Function | Digital-to-analog stereo audio playback codec |
| Power Class | Ultra-low power |
| Target Application | Portable audio equipment |
| パッケージ | 36-WCSP |
| Package Length | 2.65 mm |
| Package Width | 2.53 mm |
| Headphone Output Configuration | Stereo, ground referenced |
| Line Output Configuration | Ground referenced |
| Headphone Amplifier Technique | Wolfson Class-W technique |
| Charge-Pump Architecture | Dual mode |
| Output AC-Coupling Capacitors | Not required for ground-referenced outputs |
| Common-Mode Feedback | Provided on headphone and line outputs |
| Ground-Noise Rejection | Common-mode feedback paths designed for ground-noise rejection |
| Analog Output Channels | 2 channels |
WM8904ECS/R 2.53 mm ピン配置ガイド
WM8904ECS/R (2.53 mm パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: WM8904ECS/R.
詳細は データシート をご参照ください。
主な用途
WM8904ECS/R の用途: 6 件s: Portable Music Player, Smartphone Audio Subsystem, Bluetooth Speaker, Portable Navigation Device, Personal Audio Device, Compact Industrial Audio Terminal.
Portable Music Player
The WM8904ECS/R fits portable music players because it combines a stereo playback codec with ground-referenced headphone outputs in a 36-WCSP package measuring 2.65 mm by 2.53 mm. The dual-mode charge-pump architecture is designed to optimize efficiency and power consumption during playback, while the absence of conventional output AC-coupling capacitors can reduce the external component count. Its common-mode feedback paths are intended to reject ground noise in dense portable layouts. The design must nevertheless follow the manufacturer recommendations for decoupling, exposed-pad layout, clocking, and analog routing.
おすすめ
Smartphone Audio Subsystem
The WM8904ECS/R is suitable for a compact smartphone or connected-device audio subsystem requiring stereo headphone playback and line-level outputs. Its 2.65 mm by 2.53 mm 36-WCSP package preserves board area, and its ground-referenced output architecture eliminates the need for AC-coupling capacitors. Common-mode feedback helps preserve signal quality where headphone wiring and switching circuitry coexist. The verified excerpts do not specify the supported digital interface or supply limits, so those details must be checked in the manufacturer datasheet before assigning the codec to a handset platform.
おすすめ
Bluetooth Speaker
A battery-powered Bluetooth speaker can use the WM8904ECS/R for its stereo analog playback stage. The ultra-low-power design focus supports portable operation, while the dual-mode charge pump is intended to improve efficiency during headphone-style output operation. Ground-referenced line outputs can reduce passive-component requirements and simplify the transition from the digital audio source to amplifier or transducer circuitry. Placement remains important: keep the codec's analog outputs separated from wireless-module supplies and switching-converter hot loops, and confirm its power limits against the speaker amplifier's operating requirements.
おすすめ
Portable Navigation Device
The WM8904ECS/R fits portable navigation equipment that requires compact stereo playback for prompts, media, or accessory audio. Its ultra-low-power stereo codec architecture is tailored to portable audio use, and the compact 36-WCSP package leaves room for navigation, display, and wireless circuitry. Ground-referenced headphone and line outputs can reduce coupling-capacitor requirements, while common-mode feedback helps manage ground noise in a multi-section board. Before design release, verify the exact sample rate, digital interface, clocking mode, and supply-voltage requirements from the manufacturer datasheet.
おすすめ
Personal Audio Device
For personal-audio devices with limited internal volume, the WM8904ECS/R provides a compact stereo codec with integrated ground-referenced output stages. The 36-WCSP body measures 2.65 mm by 2.53 mm, and the architecture eliminates conventional output AC-coupling capacitors according to the manufacturer description. These characteristics can simplify assembly and conserve PCB area when driving headphones or line outputs. Because the verified data does not provide output-power, distortion, or supply-current limits, those specifications should be confirmed before setting the headphone impedance and listening-volume targets.
おすすめ
Compact Industrial Audio Terminal
The WM8904ECS/R can be considered for compact audio terminals where a local headphone or line-output interface is required, despite its primary optimization for portable audio. Its integrated stereo codec, compact 36-WCSP package, and ground-referenced outputs reduce the board area occupied by the audio path. Common-mode feedback may be useful where the analog section is close to digital or switching circuitry. Industrial deployment should wait until the operating-temperature range, supply limits, audio interfaces, and lifecycle details have been verified from current manufacturer documentation.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: WM8904ECS/R — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 |
|---|---|
| Device Type | Stereo audio codec |
| Brand | Cirrus Logic, Inc. |
| Package | 36-WCSP |
| Package Dimensions | 2.65 mm x 2.53 mm |
| Power Class | Ultra-low power |
| Headphone Output Configuration | Stereo, ground referenced |
| Line Output Configuration | Ground referenced |
| Charge-Pump Architecture | Dual mode |
| Output AC-Coupling Capacitors | Not required for ground-referenced outputs |
| Common-Mode Feedback | Provided on headphone and line outputs |
主な差別化要因
- Integrated ground-referenced stereo output architecture （vs Generic portable audio codec)
- Compact package for portable equipment （vs Larger packaged stereo codec)
- Playback-focused dual-mode charge pump （vs Generic codec without the documented Class-W approach)
設計ノート
Use the manufacturer's 36-WCSP land pattern and exposed-pad connection exactly as documented. The package measures 2.65 mm by 2.53 mm, so component spacing and solder-paste design require careful process control. Confirm whether the exposed pad is electrically tied to a supply or ground plane in the manufacturer pinout before finalizing copper; the supplied excerpts do not expose that connection.
Keep the WM8904ECS/R analog input, headphone-output, and line-output routing compact and away from switching-converter nodes. Because the device uses ground-referenced outputs and common-mode feedback, preserving a quiet analog-ground reference is essential. Route headphone traces away from antenna feeds, motor drivers, and high-current power paths, and use a continuous ground reference where the application permits.
Calculate the codec's average and peak supply demand from the manufacturer data before sharing a rail with switching converters. Estimated: required rail capacity equals the codec's maximum playback current multiplied by the required transient margin, but the actual current limit is unavailable in the verified excerpts. Add local high-frequency bypass capacitance exactly as directed by the datasheet and validate startup behavior with the selected audio format and clock configuration.
Do not treat other WM89xx codecs as automatic replacements. The WM8903CLGEFK/R appears in the supplied search results, but the evidence does not establish a shared 36-WCSP footprint, pin assignment, or matching electrical limits. Likewise, the WM8904ECS/R zero-price values are quote-request placeholders because the verified excerpts contain no numeric distributor price. Confirm live pricing, stock, lifecycle, and pin compatibility before redesigning or purchasing a replacement.
コンプライアンス情報
The supplied manufacturer and distributor excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because the WM8904ECS/R is described as a portable-audio codec, not an automotive-qualified device.
