BD3491FS-E2 Stereo Sound Processor | ROHM Semiconductor
部品番号: BD3491FS-E2 ✓ 生産中BD3491FS-E2 概要
An analog sound processor is an audio signal-processing IC that receives multiple stereo sources, selects the required input, adjusts level and tone, and routes the result into an audio signal chain. It belongs to the broader hierarchy of analog audio processor, audio signal processor, integrated circuit, and semiconductor. This category is useful when a product needs source selection and programmable sound shaping without using a digital signal processor for every adjustment.
Six single-ended stereo input selectors allow the BD3491FS-E2 to handle several analog sources while maintaining a straightforward analog architecture. Its built-in input gain controller is intended for mobile-audio applications, where changing the gain of a selected source can simplify front-end design. The volume input terminal can also serve as a microphone input because its impedance remains constant when the volume setting changes.
The two-band equalizer provides bass and treble adjustment with a gain range of plus or minus 14 dB in 2 dB steps. This allows the sound character to be tailored without adding a separate equalizer stage. Additional bass-boost, output-gain, and surround functions are realized using external components, providing flexibility between the IC and the surrounding analog network.
The Bi-CMOS process supports low-current and low-energy operation while combining bipolar and CMOS circuit characteristics. Typical uses include mobile audio equipment, consumer stereo systems, portable-media products, and other analog audio products requiring multiple source inputs. The I2C interface enables controlled configuration of the device, while the 32-SSOP-A package supports conventional surface-mount assembly.
When designing around the BD3491FS-E2, preserve the required input and output network around the external surround components, and verify the signal levels at each selected input before enabling the equalizer or bass-boost functions. The constant-impedance volume or microphone terminal can simplify source switching, but microphone biasing and termination still require appropriate external components.
This product record combines the manufacturer feature description, distributor identification, package information, application details, and design guidance in one engineering-focused reference. It also identifies the limited set of same-footprint alternatives and highlights where a complete pin-by-pin, electrical, and lifecycle review is required before substitution.
ドロップイン代替品: BD3491FS-E2 — 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。
BD3491FS
✅ ドロップイン📋 参考代替品（カタログ未掲載）
BD3485FS-E2
✅ ドロップイン価格はお問い合わせください
データシートを見る →BD3491FS-E2 最大定格＆電気的特性
| Product Type | Analog sound processor |
| Signal Channels | 2 channels |
| Supply Voltage Range | 4.75 V to 9.5 V |
| Control Interface | I2C |
| Input Selector Count | 6 single-ended stereo selectors |
| Input Gain Control | Built-in input gain controller |
| Volume Terminal Impedance Behavior | Constant when the volume setting changes |
| Microphone Input Capability | Volume input terminal can be used as a microphone input terminal |
| Equalizer Configuration | 2-band bass and treble equalizer |
| Equalizer Gain Range | Plus or minus 14 dB |
| Equalizer Gain Step | 2 dB per step |
| Additional Sound Functions | Bass boost, output gain, and surround by external components |
| Process Technology | Bi-CMOS |
| パッケージ | 32-SSOP-A |
| 実装タイプ | Surface mount |
BD3491FS-E2 32-ssop-a ピン配置ガイド
BD3491FS-E2 (32-ssop-a パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: BD3491FS-E2.
詳細は データシート をご参照ください。
主な用途
BD3491FS-E2 の用途: 6 件s: Mobile Audio Source Selector, Stereo Tone-Control Front End, Microphone and Line-Input Mixer, Surround-Sound Audio System, Portable Media Player, Compact Consumer Stereo System.
Mobile Audio Source Selector
The BD3491FS-E2 fits mobile-audio designs that need to route several stereo sources through a compact analog processor. Its six single-ended stereo input selectors reduce the number of separate switching stages, while the built-in input gain controller provides level adjustment after selection. Operating from 4.75 V to 9.5 V, the IC suits battery-derived systems whose rail remains within that range. The constant-impedance volume terminal can also support a microphone input when the surrounding bias and coupling network is designed appropriately.
おすすめ
Stereo Tone-Control Front End
The BD3491FS-E2 can provide centralized bass and treble adjustment in a stereo signal chain. Its two-band equalizer covers plus or minus 14 dB with 2 dB steps, allowing system-level tone correction without a separate stereo equalizer IC. Input selection and gain control occur before the configurable output stage, simplifying the control sequence over an I2C bus. External components implement the surround and bass-boost functions, permitting board-level tuning while retaining digital control of the main processor functions.
おすすめ
Microphone and Line-Input Mixer
The BD3491FS-E2 is appropriate for products combining microphone and line-level stereo inputs because its volume terminal can also act as a microphone input. The terminal maintains constant impedance when the volume setting changes, reducing input-loading changes during level adjustment. With six stereo input selectors, the device can centralize source routing and gain management. The microphone path still requires application-specific coupling, biasing, and termination components, while the 4.75 V to 9.5 V supply range governs the usable system rail.
おすすめ
Surround-Sound Audio System
The BD3491FS-E2 supports analog surround-sound implementation through external components in addition to its built-in source selection and equalization. This arrangement is useful in compact consumer-audio products that need programmable surround behavior but do not require a general-purpose digital signal processor. The I2C interface provides a controlled path to sound settings, and the two-channel processing structure fits conventional stereo system architecture. Component selection around the surround network must follow the manufacturer application circuit to achieve the intended acoustic response.
おすすめ
Portable Media Player
A portable media player can use the BD3491FS-E2 to combine headphone, line, and microphone paths before the final output stage. The six single-ended stereo selectors provide flexible source routing, while the built-in input gain controller helps normalize levels from different analog sources. The 4.75 V to 9.5 V operating range must be compatible with the player's regulated rail, and low-energy Bi-CMOS construction supports portable power constraints. Surround and bass boost remain component-tunable rather than being fixed entirely inside the IC.
おすすめ
Compact Consumer Stereo System
The BD3491FS-E2 fits compact stereo systems requiring multiple analog inputs, adjustable tone, and programmable surround. Its 32-SSOP-A surface-mount package supports conventional PCB assembly, while the I2C interface allows a system controller to configure the processor rather than relying entirely on mechanical controls. Bass and treble can be adjusted across plus or minus 14 dB in 2 dB steps, and output gain provides an additional level-control point. Designers should preserve the recommended external network for surround and bass-boost implementation.
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: BD3491FS-E2 — 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 | BD3491FS | BD3485FS-E2 |
|---|---|---|---|
| Package | 32-SSOP-A | 32-SSOP-A | 32-SSOP-A |
| Brand | ROHM Semiconductor | ROHM Semiconductor | ROHM Semiconductor |
主な差別化要因
- Six-input analog selection with gain control （vs BD3485FS-E2)
- Configurable two-band equalizer （vs BD3485FS-E2)
- Constant-impedance volume or microphone terminal （vs BD3485FS-E2)
設計ノート
Assign PCB tracks by following the pin-description table and application schematic in the manufacturer datasheet. Keep analog input and output routing away from digital control signals, and provide a continuous ground reference around the sound-processing network. The volume terminal may serve as a microphone input, so preserve its constant-impedance behavior and avoid adding unnecessary input loading.
Design the supply rail for the documented 4.75 V to 9.5 V operating range. Place local supply bypassing close to the device's power and ground pins, then confirm the capacitor values, voltage rating, and ESR requirements in the manufacturer application circuit. Check absolute maximum voltage and startup behavior before connecting an external audio amplifier or switching source.
Do not treat the BD3491FS and BD3485FS-E2 family relationships as proof of interchangeability. Compare every pin, supply limit, control-register definition, external-component value, and package drawing before substitution. The surround, bass-boost, and output-gain functions depend on external components, so replacing only the IC can change gain, frequency response, and stability even if the land pattern appears identical.
Use the recommended source and return paths for each of the six single-ended stereo inputs, and keep the selected signal away from high-current switching nodes. Establish appropriate signal levels before applying plus or minus 14 dB equalization to avoid excessive clipping. Validate the constant-impedance microphone or volume-input path with the intended source impedance and termination network.
コンプライアンス情報
No specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement was present in the manufacturer page excerpt or distributor records.
