WM8994ECS/R - Ultra-Low-Power Hi-Fi Audio Codec | Cirrus Logic
料号： WM8994ECS/R ✓ 量产中WM8994ECS/R 概述
An audio codec is a mixed-signal semiconductor that converts digital audio samples into analog signals and converts captured analog audio into digital data. The WM8994 belongs to the audio codec hierarchy within interface ICs, combining digital audio interfaces, analog converters, integrated amplifiers, clocking, and power-management functions. This consolidation reduces board area and power consumption in mobile multimedia systems.
The verified product information identifies a 24-bit I2S/PCM interface, ultra-low-power operation, integrated stereo Class D and AB speaker drivers, and an integrated Class W headphone driver. The device requires two external supplies, Vbatt and 1.8 V, while integrated LDOs generate the other internal supply rails. This architecture is intended to lower external power-component count and simplify portable audio designs.
Stereo full-duplex asynchronous sample-rate conversion and multi-channel audio support extend the codec beyond basic playback. Full-duplex conversion allows simultaneous playback and recording, including paths operating at different sample rates. The integrated speaker and headphone drivers move amplification closer to the codec, reducing dependence on discrete output stages in space-constrained consumer equipment.
Typical uses include smartphones, tablets, portable media players, wearable devices, and other multimedia products. An application can route digital audio through the I2S/PCM interface while using the integrated Class W headphone driver for low-power headphone playback and the Class D/AB speaker path for higher-output speaker amplification.
Designers should verify the complete pinout, absolute maximum ratings, clock requirements, exposed-ball layout, and decoupling recommendations from the manufacturer datasheet before layout. Because the supplied data does not include numeric converter performance, output power, sample-rate limits, or thermal data, those values must not be inferred from the product class.
This page combines verified manufacturer and distributor information with structured specifications, application guidance, and replacement availability. It also distinguishes verified facts from parameters that require confirmation from the WM8994 datasheet, helping engineers make sourcing and design decisions without relying on unverified assumptions.
直接替换替代料： WM8994ECS/R ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
WM8994ECS/RV
✅ 直接替换📋 参考替代料（不在目录中）
WM8994ECS/R 最大额定值与电气特性
| Product Type | Stereo Hi-Fi audio codec |
| Audio Interface | 24-bit I2S/PCM |
| 封装 | 72-ball WCSP |
| Package Dimensions | 4.52 mm x 4.03 mm |
| Power Class | Ultra-low power |
| Speaker Driver | Integrated stereo Class D/AB driver |
| Headphone Driver | Integrated Class W driver |
| External Power Supplies | 2 supplies: Vbatt and 1.8 V |
| Internal Power Generation | Integrated LDOs generate all other internal supply rails |
| Sample-Rate Conversion | Stereo full-duplex asynchronous sample-rate conversion |
| Audio Channels | Multi-channel audio support |
| Target Application | Smartphones and portable multimedia devices |
| 安装类型 | Surface-mount WCSP |
WM8994ECS/R 4.52 mm x 4.03 mm 引脚配置指南
WM8994ECS/R（4.52 mm x 4.03 mm 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： WM8994ECS/R.
请参阅 数据手册 以查看完整引脚配置。
典型应用
WM8994ECS/R 适用于 6 应用s: Smartphone Audio Playback and Recording, Portable Media Player Headphone Output, Integrated Stereo Speaker Amplification, Wearable Audio Device, Tablet Multimedia Audio Hub, Battery-Powered Connected Audio Accessory.
Smartphone Audio Playback and Recording
The WM8994ECS/R fits smartphone audio systems because it combines a 24-bit I2S/PCM interface with full-duplex asynchronous sample-rate conversion and multi-channel support. The processor can exchange digital audio with the codec while the integrated Class W headphone driver serves low-power headset playback and the stereo Class D/AB path handles speaker playback. Requiring only Vbatt and 1.8 V also simplifies portable power architecture because other internal rails come from integrated LDOs. The 72-ball WCSP is 4.52 mm by 4.03 mm, supporting compact board layouts. Actual playback quality, converter SNR, thermal behavior, and acoustic performance must be evaluated with the complete system and verified datasheet limits.
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Portable Media Player Headphone Output
The WM8994ECS/R is suitable for portable media players where integrated headphone drive can reduce board area and external amplification needs. Its Class W headphone driver is integrated into the codec, while the ultra-low-power positioning targets efficient playback from Vbatt and 1.8 V supplies. The digital source connects through the 24-bit I2S/PCM interface, allowing a portable host to control the audio stream independently of the analog output stage. A production design must verify supported sample rates, digital-audio timing, headphone impedance, output-power capability, pop-noise behavior, and bypass or mute control from the manufacturer datasheet. These limits determine whether the codec can drive the intended headphones directly or requires an external buffer.
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Integrated Stereo Speaker Amplification
The WM8994ECS/R can serve as the audio hub for portable speaker playback by integrating a stereo Class D/AB speaker driver alongside its digital audio interface. This arrangement can reduce the number of external driver devices and shorten high-current audio routing on a compact PCB. The 24-bit I2S/PCM connection provides a digital source from a portable applications processor or audio platform, while the codec controls conversion and amplification. Engineers must verify the exact Class D/AB configuration, output-power rating, load range, modulation method, thermal limits, and stability requirements. Speaker impedance, crossover design, maximum excursion, and enclosure acoustics remain system-level constraints that cannot be derived from the verified product snippets.
推荐
Wearable Audio Device
The ultra-low-power WM8994ECS/R can be evaluated for wearable and other battery-limited audio products that require headphone and speaker playback in a compact footprint. The verified 72-ball WCSP measures 4.52 mm by 4.03 mm, while integrated LDOs reduce the number of externally supplied rails. Its stereo full-duplex asynchronous sample-rate conversion may assist playback and recording when the host uses differing clock domains. For a wearable implementation, engineers should compare average and peak power across playback modes, confirm whether the Class W output can drive the selected transducer, and examine startup pop, microphone path behavior, and RF noise coupling. Device-level battery and audio-quality validation remains essential.
推荐
Tablet Multimedia Audio Hub
The WM8994ECS/R is a candidate audio hub for tablets and portable multimedia systems because it consolidates digital interfaces, headphone drive, speaker drive, and internal power generation. The 24-bit I2S/PCM interface connects to a host codec or application processor, while multi-channel and full-duplex asynchronous conversion support richer playback and recording arrangements. Only Vbatt and 1.8 V are required as external supply domains, simplifying sequencing compared with a design using separate codec and amplifier ICs. Before adoption, verify the supported channel map, sample-rate matrix, clock master or slave operation, analog input routing, and control-bus compatibility. Tablet speakers have high acoustic demand, so output power, distortion, thermal rise, and stability must be validated with the actual speaker network.
推荐
Battery-Powered Connected Audio Accessory
The WM8994ECS/R can support connected portable accessories that exchange digital audio with a host while driving headphones or a small speaker locally. Its ultra-low-power design, integrated Class W headphone driver, and integrated stereo Class D/AB speaker driver can eliminate separate codec and amplifier stages. The asynchronous sample-rate conversion capability is useful when the host and local converter do not share the same audio clock, while the multi-channel feature supports more elaborate routing. The design must still account for interface voltage levels, grounding between noisy digital and analog sections, supply sequencing, EMI from the Class D path, and speaker wiring. Use the exact manufacturer datasheet to establish supported digital formats, control registers, analog limits, and decoupling recommendations.
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推荐产品汇总
工程参考数据： WM8994ECS/R ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | WM8994ECS/RV |
|---|---|---|
| Package | 72-ball WCSP | 72-ball WCSP - same |
| Brand | Cirrus Logic | Cirrus Logic |
| Audio Interface | 24-bit I2S/PCM | 24-bit I2S/PCM |
| Speaker Driver | Integrated stereo Class D/AB driver | Integrated stereo Class D/AB driver |
| Headphone Driver | Integrated Class W driver | Integrated Class W driver |
| External Supplies | Vbatt and 1.8 V | Vbatt and 1.8 V |
| Sample-Rate Conversion | Stereo full-duplex asynchronous | Stereo full-duplex asynchronous |
| Multi-Channel Support | Yes | Yes |
| Target Device Class | Ultra-low-power portable multimedia | Ultra-low-power portable multimedia |
关键差异点
- Integration of multiple analog output stages （对比 Generic mobile 24-bit codecs)
- Reduced external supply count （对比 Codecs requiring separate internal rail generation)
- Asynchronous conversion capability （对比 Basic I2S/PCM codecs without asynchronous rate conversion)
- Very compact package （对比 Larger packaged multi-chip audio solutions)
设计说明
Treat the 72-ball WCSP as a fine-pitch mixed-signal layout problem. Place the required input, output, and internal-rail capacitors at the pins identified by the manufacturer datasheet, keep return paths short, and provide uninterrupted ground connections beneath and around the device where the package drawing permits. Separate headphone and speaker outputs from sensitive microphone or line-input routing to reduce channel-to-channel coupling.
The verified architecture requires Vbatt and 1.8 V and generates other internal rails with integrated LDOs. Verify startup order, voltage tolerances, rail sequencing, and capacitor requirements from the WM8994 datasheet rather than assuming that a 1.8 V rail can tolerate every possible battery transition. Add local supply filtering where the mixed-signal specification requires it, while observing the manufacturer's maximum ESR and stability constraints.
Keep the Class D/AB speaker outputs and Class W headphone outputs away from the digital audio interface and microphone routes. Use the datasheet-recommended output filters, grounding topology, and trace geometry, because high-current switching or class-W drive can inject switching energy into adjacent analog channels. Confirm exposed-ball or thermal requirements and use the manufacturer land pattern without altering pad geometry.
Do not treat WM8994ECS, WM8994ECS/R, and WM8994ECS/RV as interchangeable without checking the ordering table. The verified material identifies /R and /RV as reel-packaging forms, but reel orientation, quantity, labeling, and traceability may differ. A second common error is assuming that any 24-bit mobile codec is a drop-in replacement; pin mapping, clocks, registers, amplifier integration, and exposed-ball geometry must match.
合规信息
The verified product snippets do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is not applicable to this portable-audio codec use case based on the supplied target applications.
