BD37522FS-E2 - 2-Band I2C Audio Processor | ROHM
部品番号: BD37522FS-E2 ✓ 生産中BD37522FS-E2 概要
An audio sound processor is an analog signal-conditioning IC placed between audio sources and an amplifier or speaker system. It manages source selection, gain, volume, fader level, tone, and loudness functions. Within the broader semiconductor hierarchy, the BD37522FS-E2 belongs to the audio processor category and ultimately to integrated audio signal-processing circuitry for automotive infotainment and compact consumer audio equipment.
The integrated 2-band equalizer adjusts bass and treble without external equalization components. Three input selectors allow multiple source signals to be routed through one processing chain. Four-channel independent volume and fader control supports balanced multi-zone audio distribution, while main volume, input-gain, and loudness functions provide additional system-level control. The I2C interface enables a host controller to configure the sound processor instead of relying entirely on mechanical controls.
The target part operates from 7 V to 9.5 V, making it suitable for systems using an automotive-like low-voltage supply rail. Its analog audio processing architecture consolidates functions that would otherwise require multiple external ICs or discrete networks. Integration reduces the number of signal-path components, but it does not increase the output power available to speakers; a suitable audio amplifier remains required after the signal-processing stage.
Typical uses include car-audio head units, multi-zone vehicle cabin audio, radio navigation systems, portable audio products, and other installations that need independent level control for several listening areas. The internal equalizer is particularly useful where board space is constrained or tonal adjustment must be available through a digital control system.
For layout, place the device close to the audio input and output routing components, and follow the manufacturer pin-description table when assigning tracks. Keep analog signal paths away from switching nodes and high-current return paths. Confirm decoupling requirements, supported control addresses, and the applicable interface timing in the manufacturer datasheet before finalizing the PCB.
This product summary consolidates the manufacturer product information, functional architecture, sourcing guidance, and practical integration considerations for engineers evaluating the BD37522FS-E2 in analog multi-source audio systems.
ドロップイン代替品: BD37522FS-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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: BD37522FS-E2 （同一形状・フットプリント） — 相違点: Control Interface, Package, Product Type.
BD37522FS
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
BD37522FS-E2 最大定格＆電気的特性
| Product Type | Analog sound processor with built-in 2-band equalizer |
| 動作電源電圧 | 7 V to 9.5 V |
| Control Interface | I2C |
| Input Selector Count | 3 |
| Independent Volume and Fader Control | 4 channels |
| Equalizer Bands | 2 bands |
| Equalizer Controls | Bass and treble |
| Additional Audio Controls | Input gain, main volume, and loudness |
| Primary Application | Car audio |
| パッケージ | 24-pin SSOP-A |
| 実装タイプ | Surface mount |
| Channel Count | 4 controlled audio channels |
BD37522FS-E2 24-pin ssop-a ピン配置ガイド
BD37522FS-E2 (24-pin ssop-a 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: BD37522FS-E2.
詳細は データシート をご参照ください。
主な用途
BD37522FS-E2 の用途: 6 件s: Automotive Head Unit Signal Processing, Multi-Zone Vehicle Cabin Audio, Radio and Navigation Audio Multiplexing, Integrated Two-Band Tone Equalization, Compact Portable Audio Console, Multi-Channel Speaker System Control.
Automotive Head Unit Signal Processing
The BD37522FS-E2 fits the analog signal-processing section of a car-audio head unit because it combines three input selectors, input-gain control, main volume, loudness, and independent four-channel fader adjustment. It can consolidate radio, media-player, navigation, and auxiliary-source routing before a power amplifier. The 7 V to 9.5 V operating range fits low-voltage vehicle audio rails, while I2C allows a head-unit controller to manage tone and channel-level settings. The device processes signals rather than driving speakers, so a suitable output amplifier remains necessary.
おすすめ
Multi-Zone Vehicle Cabin Audio
Independent volume and fader control across four channels makes the BD37522FS-E2 useful in vehicles that distribute audio among front, rear, and additional cabin zones. The processor accepts multiple selected sources, applies shared tone and loudness processing, and provides separate level control where the architecture requires it. Its I2C control interface allows the vehicle head unit or body controller to coordinate settings. System planners should verify channel assignment, signal polarity, load limits, and thermal conditions in the manufacturer application guidance before connecting power amplifiers.
おすすめ
Radio and Navigation Audio Multiplexing
The three input selectors in the BD37522FS-E2 allow a navigation, radio, or media signal to be selected within a shared analog processing path. This is valuable when the final amplifier stage must receive a consistent level and tonal balance regardless of the active source. Input-gain control provides an additional adjustment stage before main-volume and loudness processing. For this use case, follow the manufacturer pin and application guidance to preserve signal integrity and avoid routing audio directly into an unsuitable source impedance.
おすすめ
Integrated Two-Band Tone Equalization
The built-in 2-band equalizer allows the BD37522FS-E2 to provide programmable bass and treble adjustment without a passive tone-control network. This reduces board area and supports I2C-managed sound profiles in car-audio and compact consumer-audio products. The equalizer operates inside the broader processor alongside source selection, gain, loudness, and channel fader functions, making it practical to retain one audio feature block. Exact adjustment range, filter behavior, and control registers should be taken from the manufacturer datasheet.
おすすめ
Compact Portable Audio Console
A portable audio console can use the BD37522FS-E2 to consolidate multiple analog inputs, bass-and-treble adjustment, loudness, and per-channel level control without several separate control ICs. The processor is suited to systems whose architecture already operates from a 7 V to 9.5 V rail and can accommodate a 24-pin SSOP-A. I2C management reduces front-panel control complexity by transferring configuration to a host controller. The design must still include appropriate input conditioning, output amplification, decoupling, and protection for the intended product environment.
おすすめ
Multi-Channel Speaker System Control
Four-channel volume and fader control makes the BD37522FS-E2 applicable to compact speaker systems that need separate output-level adjustment while sharing a common source and tonal profile. It can sit between line-level audio sources and a multi-channel amplifier, simplifying system control and reducing the number of external potentiometer networks. Because it is a sound processor rather than an output amplifier, each channel still requires the necessary power-amplifier stage and passive crossover or protection network defined by the loudspeaker design.
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: BD37522FS-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 | BD37522FS |
|---|---|---|
| Brand | ROHM Semiconductor | ROHM Semiconductor |
| Package | 24-pin SSOP-A | 24-pin SSOP-A |
| Product Type | Analog sound processor | Analog sound processor |
| Operating Supply Voltage | 7 V to 9.5 V | 7 V to 9.5 V |
| Control Interface | I2C | I2C |
| Input Selector Count | 3 | 3 |
| Independent Volume and Fader Control | 4 channels | 4 channels |
| Equalizer Configuration | Built-in 2-band bass and treble equalizer | Built-in 2-band bass and treble equalizer |
| Additional Audio Functions | Input gain, main volume, and loudness | Input gain, main volume, and loudness |
| Primary Application | Car audio | Car audio |
主な差別化要因
- Consolidates multiple analog audio-control functions （vs BD37522FS)
- Digital configuration through I2C （vs BD37522FS)
- Four-channel independent volume and fader control （vs BD37522FS)
設計ノート
Assign the PCB footprint and every connection from the pin-description table in the ROHM datasheet. Keep the 24-pin SSOP-A orientation consistent with the manufacturer's drawing and verify the lead pitch before releasing artwork. Place the sound processor close to the input-selection and analog output routing components to minimize sensitive audio traces. Do not infer functions from another sound processor because identical pin positions can carry different control, supply, ground, or analog signals.
Route audio inputs and outputs away from switching-converter nodes, relay contacts, motor-control traces, and high-current return paths. Maintain continuous ground references under the analog signal path and decouple supply pins according to the manufacturer application circuit. Because the equalizer, input-gain stage, loudness circuit, and volume controls operate in the same analog path, grounding and bypassing errors can produce noise or channel imbalance even when the digital control commands are correct.
Do not treat the BD37522FS-E2 as a speaker-output amplifier. It is a line-level sound processor, so a suitable output-amplifier stage is required. Also verify that all source signals share compatible amplitude and impedance before selecting an input, and confirm the I2C address and control-map settings in the manufacturer datasheet. The E2 suffix identifies the purchasable ordering configuration, so BOM substitutions should preserve the required package and functional behavior.
コンプライアンス情報
The identified product pages do not state the requested compliance classifications. Confirm RoHS, REACH, automotive qualification, lead-free, halogen-free, and conflict-minerals status using the manufacturer's current product documentation before production release.
