BD37524FS-E2 - 3-Band Equalizer Audio Processor | ROHM
料号： BD37524FS-E2 ✓ 量产中BD37524FS-E2 概述
A sound processor is an audio signal-chain IC that applies level, tonal, and channel-control functions before power amplification. The BD37524FS-E2 combines source selection, input gain, main volume, loudness compensation, five-channel fader control, subwoofer filtering, and level metering in one device. Its internal equalizer supports bass, midrange, and treble adjustment, reducing the need for external tone-control components and simplifying the control software used by car-audio systems.
The key acoustic performance specifications include total harmonic distortion of 0.001% for the front and rear channels and 0.002% for the subwoofer output. Typical input-to-output crosstalk between selectors is -100 dB, while the maximum input is 2.3 Vrms. These figures suit head-unit and signal-path designs where low distortion, low channel leakage, and consistent source switching are important. The parametric equalizer can also be adjusted without external passive components.
Internally, the device uses an advanced switching circuit intended to reduce switching noise while changing sources or control states. The five-channel input selector accepts stereo sources and distributes the selected audio to the relevant output paths. A low-pass filter supports subwoofer output, and a level-meter output provides a control signal for monitoring or system management. The I2C interface allows a host controller to configure source selection, gain, volume, equalizer, loudness, fader, and related functions.
Typical applications include car-audio head units, automotive multimedia systems, source-selection units, and aftermarket sound controllers. The integrated three-band equalizer is particularly useful where the enclosure, speaker positions, or cabin acoustics require tonal adjustment. The dedicated subwoofer low-pass path can simplify crossover implementation when the processor sits ahead of the external power amplifiers.
When designing the power and signal path, maintain the specified 7.0 V to 9.5 V operating range and use the pin-description and application-circuit tables in the ROHM datasheet for decoupling, I2C pull-up, and output connections. Because the BD37524FS-E2 is an audio processor rather than a power amplifier, its outputs still require appropriately rated external amplifier stages to drive speakers.
This product page combines the manufacturer’s feature description, electrical characteristics, package information, ordering guidance, and drop-in compatibility assessment. It also organizes the component by function so engineers can evaluate the processor for automotive audio, source switching, tone control, subwoofer filtering, and consumer-audio signal-chain applications.
直接替换替代料： BD37524FS-E2 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料BD37524FS-E2 最大额定值与电气特性
| Product Type | Sound processor with built-in three-band equalizer |
| Supply Voltage Range | 7.0 V to 9.5 V |
| Circuit Current Without Signal | 38 mA typical |
| Control Interface | I2C, 3.3 V or 5 V |
| Input Configuration | 5-channel stereo input selector |
| Front and Rear Total Harmonic Distortion | 0.001% typical |
| Subwoofer Total Harmonic Distortion | 0.002% typical |
| Maximum Input Voltage | 2.3 Vrms typical |
| Crosstalk Between Selectors | -100 dB typical |
| Equalizer Bands | 3 bands: bass, midrange, and treble |
| Integrated Audio Controls | Input gain, main volume, loudness, and 5-channel fader volume |
| Subwoofer Output Filter | Low-pass filter |
| Level Meter | Built-in level-meter output |
| Switching Noise Reduction | Advanced switch circuit |
| 封装 | 24-SSOP-A |
| 安装类型 | Surface mount |
| RoHS 状态 | RoHS3 compliant |
BD37524FS-E2 24-ssop-a 引脚配置指南
BD37524FS-E2（24-ssop-a 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： BD37524FS-E2.
请参阅 数据手册 以查看完整引脚配置。
典型应用
BD37524FS-E2 适用于 6 应用s: Automotive Head Unit Signal Processing, Five-Channel Automotive Source Selector, Vehicle Subwoofer Crossover Control, Automotive Loudness and Fader Control, Digital-Controlled Car Audio Chassis, Multi-Source Premium Audio Module.
Automotive Head Unit Signal Processing
The ROHM BD37524FS-E2 fits between automotive source inputs and external power amplifiers in a head-unit signal chain. Its five-channel stereo selector controls multiple sources, while the built-in bass, midrange, and treble equalizer permits tonal adjustment without external passive networks. A 7.0 V to 9.5 V operating range and 38 mA typical no-signal current suit regulated vehicle audio rails. The 0.001% typical front and rear THD helps preserve low distortion through the processor, although external amplifiers are still required to drive loudspeakers.
Five-Channel Automotive Source Selector
The BD37524FS-E2 can centralize switching among five stereo source channels in an automotive multimedia system. The I2C-controlled selector reduces the number of mechanical controls in the user interface, while -100 dB typical crosstalk between selectors supports clean source changes. Input gain and main-volume controls establish the signal level before distribution to the front, rear, and subwoofer paths. Use the ROHM pin and application-circuit tables to define routing, grounding, and decoupling for the selected automotive source topology.
Vehicle Subwoofer Crossover Control
The integrated subwoofer low-pass filter makes the BD37524FS-E2 useful as the tone and crossover-control stage ahead of a dedicated subwoofer amplifier. The processor provides 0.002% typical THD at the subwoofer output and supports volume, loudness, equalizer, fader, and source controls through its I2C interface. This consolidates functions that might otherwise require separate control components. The external power amplifier must still provide speaker drive and appropriate protection, and the crossover frequency should be configured according to the manufacturer control procedure.
Automotive Loudness and Fader Control
The BD37524FS-E2 combines loudness compensation and five-channel fader-volume control for vehicle cabins where small speakers require low-frequency compensation. Its integrated controls let a host processor adjust tonal balance and channel levels without adding separate analog control ICs. The front and rear paths offer 0.001% typical THD, while 2.3 Vrms typical maximum input defines the nominal signal range described by ROHM. Validation should include speaker impedance, source-level headroom, and the final vehicle acoustics because these system variables affect perceived loudness.
Digital-Controlled Car Audio Chassis
A digital-controlled car-audio chassis can use the BD37524FS-E2 as the centralized I2C-managed audio controller. The 3.3 V or 5 V control interface supports integration with a system processor, while the analog stage handles source selection, gain, equalization, volume, loudness, fader control, subwoofer filtering, and level metering. The 24-SSOP-A package keeps the functional block compact, and 38 mA typical no-signal current provides a defined baseline for power-budget work. Firmware must implement the device’s command and status behavior described in the ROHM datasheet.
Multi-Source Premium Audio Module
The BD37524FS-E2 can serve as the processing core of a multi-source premium audio module for automotive or controlled consumer installations. Built-in three-band equalization allows each source or listening profile to be tuned without an external passive network, while the five-channel selector provides centralized routing. Typical front and rear THD is 0.001%, and the subwoofer path is 0.002%. For a consumer implementation, verify the 7.0 V to 9.5 V supply requirement, complete I2C register map, thermal performance in the enclosure, and compatibility with the intended power-amplifier architecture.
工程参考数据： BD37524FS-E2 ——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 |
|---|---|
| Package | 24-SSOP-A |
| Brand | ROHM Semiconductor |
| Power Supply Voltage | 7.0 V to 9.5 V |
| No-Signal Circuit Current | 38 mA typical |
| Control Interface | 3.3 V or 5 V I2C |
| Front and Rear THD | 0.001% typical |
| Subwoofer THD | 0.002% typical |
| Input Selector | 5-channel stereo |
| Maximum Input | 2.3 Vrms typical |
| Inter-Selector Crosstalk | -100 dB typical |
关键差异点
- Integrates a complete car-audio control chain （对比 Generic standalone audio processors)
- Low distortion in front and rear channels （对比 General-purpose switched audio processors)
- Digital configuration without external control ICs （对比 Analog potentiometer-controlled equalizers)
设计说明
Keep the BD37524FS-E2 within its 7.0 V to 9.5 V supply range and place local input and output bypass capacitors exactly as shown in the ROHM application circuit. A 12 V vehicle battery is not a direct supply for this IC; use a regulator with automotive-transient protection and sufficient headroom. The typical no-signal current is 38 mA, so include regulator sizing and quiescent dissipation in the power-budget calculation.
Route the five stereo input channels and their associated ground returns as short, matched paths, with ground-plane continuity maintained beneath the audio routes. The processor supports a 2.3 Vrms typical maximum input and -100 dB typical selector crosstalk, but PCB leakage and long unbalanced traces can degrade performance. Use the manufacturer pin descriptions to identify input, output, control, and ground assignments before finalizing routing.
Do not treat the BD37524FS-E2 as a speaker-output amplifier; its outputs are audio-signal outputs for external power-amplifier stages. Confirm the selected source gains and fader settings in firmware so channel changes do not create excessive level shifts. The 3.3 V or 5 V I2C requirement applies to the control interface, not to the 7.0 V to 9.5 V analog-device supply.
Follow the ROHM package drawing for the 24-SSOP-A land pattern, pin numbering, and solder-mask clearance. Place the I2C pull-up network close to the bus endpoints, keep switching and digital-control return currents away from sensitive audio inputs, and provide a continuous low-impedance ground path. Verify the footprint against the actual E2 ordering suffix before releasing artwork.
合规信息
ROHS3 compliance is identified for the BD37524FS-E2. The ROHM product information does not establish REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
