BD3485FS-E2 - 4-Channel Tone Control Audio IC | ROHM
MPN： BD3485FS-E2 ✓ 啟用中BD3485FS-E2 概覽
An audio sound processor is an integrated circuit that manages selected functions within an audio signal chain. The typical signal path includes an audio source, a tone-control or sound-processing stage, an amplifier, and a speaker or headphones. By combining four processing channels in one package, the BD3485FS-E2 can reduce component count and simplify board routing compared with four separate single-channel controllers.
The key characteristics established for this device are its four-channel configuration, tone-control function, BiCMOS construction, and SSOP-32 package. These features make it relevant to multi-zone audio equipment, compact stereo products, portable consumer electronics, and embedded sound systems. The 32-pin surface-mount package also supports automated assembly and provides a defined footprint for compact circuit boards.
BiCMOS construction combines bipolar and CMOS transistor technologies within the same integrated circuit. In audio-processing equipment, this approach can support a blend of analog signal handling and digital control functions. Because the BD3485FS-E2 is identified as a dedicated audio-channel IC rather than a general-purpose amplifier, its selection should be based on matching the required channel count, control functions, package, and system-level audio architecture.
Typical applications include compact stereo systems, multimedia speaker designs, portable audio equipment, and multi-channel consumer products. The four channels are especially useful when several independently processed audio zones share one circuit board. Designers should also verify the complete electrical interface, recommended external components, control method, and signal levels against the manufacturer datasheet before finalizing a new design.
Layout is a central implementation consideration for a four-channel sound processor. Keep input and output routing short, maintain a stable analog ground path, and place required bypass or support components close to their associated pins. Correct decoupling, controlled trace geometry, and clean separation from switching circuitry help preserve audio quality and reduce the chance of unintended noise coupling.
This product page combines the confirmed four-channel, tone-control, BiCMOS, and SSOP-32 characteristics with practical selection guidance, application context, PCB implementation notes, and verified source links. It also distinguishes the device from unsupported replacement claims and directs engineers to the manufacturer datasheet for the complete pin, electrical, and application information.
直接替換替代品，適用於 BD3485FS-E2 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品BD3485FS-E2 最大額定值與電氣特性
| Product Type | Audio Channel IC / Tone Control Sound Processor |
| Number of Channels | 4 channels |
| Primary Function | Tone control circuit |
| Process Technology | BiCMOS |
| Package Type | SSOP-32 |
| Package Designation | PDSO32 |
| 安裝類型 | Surface mount |
| Integrated Circuit Type | Silicon monolithic integrated circuit |
| RoHS 狀態 | RoHS compliant |
BD3485FS-E2 pdso32 腳位配置指南
BD3485FS-E2（pdso32 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： BD3485FS-E2.
請參閱 資料表 以查看完整腳位配置。
典型應用
BD3485FS-E2 適用於 6 應用s: Compact Stereo Audio Systems, Multimedia Speaker Enclosures, Portable Audio Products, Multi-Zone Audio Distribution, Home Audio Control Panels, Audio Interface Signal Conditioning.
Compact Stereo Audio Systems
The ROHM BD3485FS-E2 fits compact stereo products that need several sound-processing paths in a small circuit area. Its four-channel architecture can cover multiple stereo, auxiliary, or zone inputs without requiring four separate single-channel tone-control packages. The SSOP-32 surface-mount construction supports dense layouts, while BiCMOS technology is appropriate for a dedicated audio-processing function. Designers should map the required channels to the manufacturer pin table, implement the recommended external networks, and preserve a low-noise ground path from source to output amplifier.
推薦
Multimedia Speaker Enclosures
The BD3485FS-E2 is useful in multimedia speaker systems that need multiple tone-managed inputs and compact board space. Four processing channels can handle primary, auxiliary, or zone signals while maintaining a single IC-centered architecture. Its 32-pin SSOP package allows short connections to source selectors and output stages, but each channel still requires the signal conditioning and bypass arrangements shown in the manufacturer application circuit. Keep switching regulators and digital processors separated from sensitive audio traces to reduce audible interference.
推薦
Portable Audio Products
Portable audio products benefit from the BD3485FS-E2 when several sound paths must be managed in a constrained board area. Integrating four channels can reduce component count compared with four separate controllers and can shorten traces between the processor and downstream circuitry. The SSOP-32 package is suitable for automated surface-mount production, but narrow lead spacing requires careful stencil and inspection planning. Confirm supply voltage, signal levels, control method, and power consumption in the manufacturer datasheet before committing it to a battery-powered design.
推薦
Multi-Zone Audio Distribution
The BD3485FS-E2 can serve multi-zone audio equipment where several inputs require tone control before distribution to amplifiers or speakers. Four channels allow common audio-path management within one SSOP-32 device, reducing duplicated circuitry and simplifying control organization. The design must assign each channel according to the manufacturer pin table and preserve adequate isolation between neighboring paths. Short, balanced routing practices are not a substitute for the specified application network; use the datasheet reference circuit and test channel-to-channel crosstalk in the final enclosure.
推薦
Home Audio Control Panels
The BD3485FS-E2 is applicable to home-audio control panels that combine several tone-managed paths with compact switching and selection circuitry. Its four-channel BiCMOS sound processor can centralize bass, treble, and related tone functions while limiting discrete component count. Because the control interface and signal-level limits are not established by the product summary, the design must be based directly on the manufacturer pin descriptions and typical application circuit. Keep control traces away from audio nets where practical and test operation during power-up and source changes.
推薦
Audio Interface Signal Conditioning
The BD3485FS-E2 can be evaluated for multi-channel analog audio conditioning between source circuitry and an output stage. Four tone-control channels provide a practical way to normalize multiple inputs before downstream conversion or amplification. The SSOP-32 footprint keeps the device close to the active signal path, provided the PCB uses short traces and a carefully arranged analog ground region. Use the manufacturer application circuit to select external resistors and capacitors, and confirm that source amplitudes remain within the device’s supported operating range before layout release.
推薦
推薦產品摘要
工程參考資料，適用於 BD3485FS-E2 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | SSOP-32 (PDSO32) |
| Brand | ROHM Semiconductor |
| Product Type | Audio Channel IC / Tone Control Sound Processor |
| Channel Count | 4 channels |
| Process Technology | BiCMOS |
| Primary Function | Tone control circuit |
| Mounting Type | Surface mount |
| RoHS Status | Compliant |
| Ordering Designation | BD3485FS-E2 |
| Integrated Circuit Construction | Silicon monolithic integrated circuit |
主要差異化特點
- Four-channel audio processing in one package (對比Generic single-channel tone-control implementation)
- Dedicated tone-control function (對比General-purpose signal-path IC)
- Compact surface-mount integration (對比Discrete four-channel tone-control design)
設計說明
Build the board around the manufacturer SSOP-32 pin description and recommended application circuit. Place the required bypass and support components close to their associated pins, keep audio input and output traces short, and avoid routing them beneath noisy switching stages. Because the package has 32 pins in a narrow outline, verify trace clearances, soldermask geometry, and assembly access using the package drawing before release.
Create a quiet analog return path for the four audio channels and connect power-decoupling networks according to the manufacturer guidance. Keep switching-regulator and digital-clock routing away from sensitive audio nets, particularly when the SSOP-32 device sits close to the enclosure edge or digital source circuitry. Use a clear ground partition only if it follows the reference layout; otherwise maintain a unified low-impedance ground system to avoid creating additional return paths.
Do not treat an SSOP-32 package match as proof of replaceability. A valid substitute must reproduce the four-channel function, control interface, electrical limits, pin assignments, and external networks. Check every pin against the manufacturer table and preserve the E2 ordering designation when procuring the exact device. Prototype channel-level measurements for noise, crosstalk, and tone response before committing to production quantities.
合規資訊
RoHS compliance is identified in the product specifications. REACH, automotive qualification, lead-free, halogen-free, and conflict-minerals status require confirmation from the manufacturer.
