WM8944BECS/R - 24-Bit Mono Low-Power Codec | Cirrus Logic
部品番号: WM8944BECS/R ✓ 生産中WM8944BECS/R 概要
An audio codec is an integrated circuit that converts between digital audio data and analog microphone, line, headphone, or speaker signals. In the signal-chain hierarchy, the WM8944 combines a sigma-delta analog-to-digital converter, digital-to-digital conversion paths, analog bypass routing, output mixing, and an audio/video buffer within one low-power package. The manufacturer identifies the part as a mono low-power hi-fi codec with flexible single-ended and differential output configurations.
Key features include one analog-to-digital converter and one digital-to-analog converter, sigma-delta conversion, 24-bit resolution, a stereo digital microphone interface, and support for up to two analog audio inputs. The listed signal-to-noise performance is 94 dB for the ADC path and 96 dB for the DAC path. Mono line output and mono bridge-tied-load headphone or speaker drive are also supported.
The digital control interface supports both I2C and SPI, allowing the host processor to configure registers, mixer paths, input gains, and output routing. Flexible output mixing supports single-ended and differential configurations, with outputs derived from digital audio paths or analog bypass paths. This combination lets one codec serve microphone, line-input, and headphone or speaker-output stages without requiring a separate output amplifier in many portable designs.
Typical applications include digital still cameras, portable media devices, compact audio capture systems, and camera modules that require microphone conversion alongside a video signal path. The video-buffer function allows the codec to support companion video routing while the device operates from a single integrated audio subsystem.
Designers should follow the manufacturer pin-description table when assigning PCB tracks, particularly because the 25-W-CSP land pattern is compact and requires short, direct routing. Decoupling, analog input filtering, output-driver configuration, and BTL load connections must be implemented according to the device application guidance.
This page consolidates the WM8944BECS/R interface, package, conversion, and application characteristics with engineering guidance on routing, supply decoupling, output configuration, and realistic substitute-part evaluation.
ドロップイン代替品: WM8944BECS/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WM8944BECS/R 最大定格＆電気的特性
| Product Type | Mono low-power audio codec with video buffer |
| Audio Resolution | 24 bit |
| Host Control Interfaces | I2C and SPI |
| Package Type | 25-W-CSP surface-mount package |
| Package Dimensions | 2.41 mm x 2.41 mm |
| 実装タイプ | SMD (SMT) |
| Packaging Type | Reel (TR) |
| Number of ADCs | 1 |
| Number of DACs | 1 |
| Converter Architecture | Sigma-delta |
| ADC Signal-to-Noise Ratio | 94 dB typical |
| DAC Signal-to-Noise Ratio | 96 dB typical |
| Analog Input Channels | Up to 2 analog inputs |
| Digital Microphone Interface | Stereo digital microphone interface |
| Line Output | Mono line output |
| Headphone or Speaker Output | Mono BTL headphone/speaker drive |
| Output Mixing | Single-ended and differential configurations |
| Audio Routing Sources | Digital audio paths or analog bypass paths |
| ライフサイクル状態 | Active |
WM8944BECS/R 2.41 mm x 2.41 mm ピン配置ガイド
WM8944BECS/R (2.41 mm x 2.41 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: WM8944BECS/R.
詳細は データシート をご参照ください。
主な用途
WM8944BECS/R の用途: 6 件s: Digital Still Camera Audio Path, Portable Voice-Recording Device, Compact Camera Module, Portable Media Player Headphone Output, Digital Microphone Acquisition System, Portable Audio Accessory with Analog Bypass.
Digital Still Camera Audio Path
The WM8944BECS/R fits a digital still camera that captures mono audio alongside video. Its 24-bit ADC, listed 94 dB typical signal-to-noise ratio, and support for up to two analog inputs provide a compact path for a built-in microphone and an additional line-level source. The integrated video buffer lets the codec participate in the device's media-routing architecture without requiring a separate buffer IC. Configure digital mixing and analog bypass paths through the I2C or SPI host interface, and use the manufacturer's camera application guidance for microphone biasing, filtering, and analog input conditioning.
おすすめ
Portable Voice-Recording Device
The WM8944BECS/R suits portable voice recorders requiring one high-quality mono capture channel and flexible output routing. The 24-bit sigma-delta ADC, 94 dB typical ADC signal-to-noise ratio, and two analog input positions support microphone capture with an optional line input. A stereo digital microphone interface adds another source option, while the I2C and SPI control paths simplify connection to a low-power application processor. Mono line output and BTL headphone or speaker drive support monitoring and playback in a compact enclosure.
おすすめ
Compact Camera Module
The 2.41 mm by 2.41 mm 25-W-CSP package makes the WM8944BECS/R appropriate for space-constrained camera modules that already contain a video path. Combining the mono codec and video-buffer function can reduce board area compared with separate audio and video routing devices. Two analog input positions support microphone and line-source connections, while the stereo digital microphone interface offers an additional digital capture option. Apply the manufacturer's CSP layout guidance closely to keep analog traces short and isolate sensitive inputs from switching outputs.
おすすめ
Portable Media Player Headphone Output
The WM8944BECS/R can serve as the integrated audio output stage of a portable media player. Its 24-bit DAC path, listed 96 dB typical signal-to-noise ratio, flexible mixer, and analog bypass routing allow digital playback and line-level sources to share the same output section. Mono BTL headphone or speaker drive reduces the external component count compared with a single-ended arrangement, although output impedance, load limits, and protection requirements must follow the datasheet. The I2C or SPI control path allows a host processor to adjust volume and routing during playback.
おすすめ
Digital Microphone Acquisition System
The WM8944BECS/R is appropriate for systems that need analog microphone capture alongside a stereo digital microphone interface. The 24-bit sigma-delta conversion architecture and separate listed ADC and DAC signal-to-noise figures support mixed-source acquisition, while flexible mixer paths let the host select digital microphone, analog input, or bypass audio. This is useful in compact audio-accessory designs where a camera, wearable, or sensor node must accept both analog and digital microphones. Configure clocking and digital microphone timing from the manufacturer reference design and keep sensitive digital microphone routing away from output-driver traces.
おすすめ
Portable Audio Accessory with Analog Bypass
The WM8944BECS/R supports accessories that must switch between a processed digital audio path and an analog bypass path. Up to two analog inputs can feed the codec, and the flexible output mixer can derive mono line or BTL headphone output from digital playback, analog inputs, or bypass audio. This flexibility is useful for docking stations, portable speakers, and multifunction accessories. The I2C and SPI interfaces provide host control of routing and gain, while the 25-W-CSP footprint limits board area. Validate analog switch-over behavior and acceptable ground offsets in the final system.
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: WM8944BECS/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 |
|---|---|
| Product Type | Mono low-power audio codec with video buffer |
| Audio Resolution | 24 bit |
| Host Control Interfaces | I2C and SPI |
| ADC Signal-to-Noise Ratio | 94 dB typical |
| DAC Signal-to-Noise Ratio | 96 dB typical |
| Number of ADCs and DACs | 1 ADC and 1 DAC |
| Analog Inputs | Up to 2 analog inputs |
| Package | 25-W-CSP, 2.41 mm x 2.41 mm |
| Brand | Cirrus Logic Inc. |
| Mounting Type | SMD (SMT) |
主な差別化要因
- Integrated video-buffer function alongside the mono codec （vs WM8960)
- Mixed analog and digital microphone capability （vs WM8974)
- Integrated mono BTL output drive （vs WM895)
設計ノート
Route the 25-W-CSP land pattern exactly to the Cirrus Logic package drawing and pin-description table. Keep analog microphone and line-input traces short, place their anti-alias or filtering networks close to the associated balls, and connect the device ground and supply balls directly to their recommended plane connections. The 2.41 mm by 2.41 mm body leaves little routing margin, so verify pad dimensions and solder-mask rules against the latest manufacturer package data before layout release.
Use the capacitor values and placement shown in the WM8944 application guidance for both analog and digital supply rails. Because the codec combines a switching-based sigma-delta converter with sensitive microphone and line inputs, route supply current away from the analog input area and place high-frequency bypass capacitance at the relevant package balls. Verify startup sequencing and rail limits in the final system, particularly when the codec shares a rail with a video buffer or switching display subsystem.
Treat the digital microphone, I2C, SPI, and audio clock connections as controlled-impedance paths and keep them away from analog microphone inputs and BTL outputs. Confirm clock amplitude, timing, and grounding against the manufacturer digital-audio specifications. When a bypass path or single-ended output is used, evaluate possible ground-potential offsets between the source and codec; BTL drive reduces output-current demand but does not remove the need for correct load and layout design.
Do not treat a same-family or functionally similar codec as a board-level substitute until its package, ball assignments, supply rails, clocking, register interface, and output-drive limits have been compared with the WM8944. The WM8960, WM8974, and WM895 are related portable-audio devices, but the available cross-reference listing does not establish pin compatibility. Requiring a schematic-level and register-level review prevents incorrect I2C addresses, missing enable sequencing, and load or impedance mismatches.
コンプライアンス情報
The manufacturer lists the WM8944 as active, but no specific RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals statements are present in the available product and catalog information. Confirm the required compliance documents for the exact orderable part before production release.
