BD3871FS-E2 - 2-Channel Audio Processor | ROHM
MPN: BD3871FS-E2 ✓ Hoạt độngBD3871FS-E2 Tóm tắt
A sound processor is an analog audio integrated circuit that modifies or controls audio signals between a source and an output stage. In the broader electronics hierarchy, it belongs to the audio signal-processing category, connects to audio codecs and interface ICs, and ultimately supports broader audio signal-chain and power-management systems. The BD3871FS-E2 is intended for compact stereo equipment where tone adjustment, channel control, and surround processing can be integrated without a separate digital signal processor.
The bass section uses external components, allowing its center frequency and Q factor to be adjusted to match the speaker system and target acoustic response. This flexibility is useful in consumer audio products because a fixed internal filter may not provide adequate control across different cabinet sizes, driver impedances, or listening positions. The device also supports a surround function constructed without external components, reducing board area and component count where that processing mode is required.
A mute function is assigned to one input pin, enabling channel suppression during switching or mode changes and helping reduce crosstalk between stereo paths. The bipolar CMOS process combines bipolar circuitry with CMOS logic and supports low current consumption for an energy-saving design. The 24-SSOP-A package provides a compact surface-mount format suitable for home-audio, automotive-audio, and portable-equipment signal boards.
Typical uses include stereo tone-control boards, mini hi-fi amplifiers, television audio paths, compact stereo systems, and aftermarket speaker selectors. In a home-audio design, the processor can shape bass response ahead of a power amplifier while a mute input handles source changes. In automotive systems, its integrated surround function can add room-effect processing without requiring a separate surround decoder.
The main design consideration is the external-component network around the bass filter. Component tolerances and the selected center frequency and Q factor directly influence tonal balance, so prototype the network against the intended loudspeaker load. Keep audio inputs and outputs away from switching supplies and high-current amplifier paths to preserve signal integrity.
This product page combines manufacturer feature information, practical application guidance, package and interface details, and carefully qualified drop-in replacement information to support faster engineering evaluation and sourcing decisions.
Bộ thay thế dễ dàng lắp đặt cho BD3871FS-E2 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với BD3871FS-E2 (cùng hình factor và footprint) — khác nhau ở Mute Function, Package, Product Type, Surround Processing.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếBD3871FS-E2 Tỷ lệ tối đa & tính chất điện
| Product Type | 2-channel bipolar CMOS sound processor |
| Điện áp cung cấp hoạt động | 4.5 V to 9.5 V |
| Channel Count | 2 channels |
| Process Technology | BiCMOS |
| Hộp | 24-SSOP-A |
| Kiểu lắp đặt | Surface mount |
| Bass Filter Adjustment | External center-frequency and Q-factor components |
| Surround Processing | Constructible without external components |
| Mute Function | Input-pin mute switch for crosstalk suppression |
| Power Consumption | Low-current BiCMOS design |
Hướng dẫn cấu hình chân BD3871FS-E2 24-ssop-a
Cấu hình chân cho BD3871FS-E2 (24-ssop-a gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho BD3871FS-E2.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
BD3871FS-E2 phù hợp cho 6 Áp dụngs: Stereo Tone-Control Boards, Home-Audio Mini Systems, Automotive Audio Head Units, Television Audio Signal Paths, Speaker-Selector and Zone-Audio Systems, Portable and Compact Stereo Equipment.
Stereo Tone-Control Boards
The BD3871FS-E2 is well suited to a stereo tone-control board because it processes 2 channels and lets the bass section use external components for center-frequency and Q-factor adjustment. Place the IC between the source selector and the audio output stage, then tune the passive network against the intended speaker impedance. Its 4.5 V to 9.5 V supply range supports conventional analog audio systems, while the input mute function can suppress audible transitions when users change sources or operating modes.
Được đề xuất
Home-Audio Mini Systems
In a compact home-audio system, the BD3871FS-E2 can add adjustable bass response and surround processing ahead of a power amplifier. The manufacturer identifies a surround configuration that can be built without external components, reducing board requirements when a basic spatial effect is sufficient. Its 2-channel organization supports stereo routing, while the mute input provides a convenient way to suppress channel crosstalk during switching. Prototype the bass network because the 24-SSOP-A device gives designers control over the final acoustic response.
Được đề xuất
Automotive Audio Head Units
The BD3871FS-E2 can serve as the analog tone and surround processor in a compact automotive audio head unit. Its 2-channel structure supports stereo audio paths, and the adjustable bass characteristics allow tuning for the vehicle loudspeakers and cabin acoustics. The surround function offers an additional listening mode without requiring a separate surround decoder. Confirm automotive qualification and temperature limits in the manufacturer documentation before using the device in safety- or temperature-critical vehicle equipment.
Được đề xuất
Television Audio Signal Paths
A television or display product can use the BD3871FS-E2 to condition stereo audio before amplification. Adjustable bass frequency and Q provide a way to compensate for different speaker placements, while the input mute function can help control crosstalk during input changes. The device operates from 4.5 V to 9.5 V, allowing integration into low-voltage analog audio boards. Keep the audio routing separated from display switching regulators and maintain short, grounded signal paths to minimize injected noise.
Được đề xuất
Speaker-Selector and Zone-Audio Systems
The BD3871FS-E2 can be integrated into a speaker-selector or multi-zone audio board to provide consistent tone processing before distribution to multiple amplifier channels. Its 2-channel processing supports conventional stereo routing, and the input mute function can suppress unwanted signal propagation during zone or source changes. The bipolar CMOS implementation also supports low-power operation. Select passive bass-network values carefully because changing speaker impedance and cable loading can alter the perceived bass response even when the IC configuration remains unchanged.
Được đề xuất
Portable and Compact Stereo Equipment
The low-current BiCMOS design of the BD3871FS-E2 makes it suitable for compact stereo equipment that requires analog tone controls without a digital signal processor. The 4.5 V to 9.5 V operating range fits many low-voltage audio systems, while the 24-SSOP-A package supports compact surface-mount layouts. Its mute function can reduce channel crosstalk during mode changes, and the external bass network lets designers adapt the response to small speaker enclosures. Validate noise and output swing in the complete signal chain.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho BD3871FS-E2 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này |
|---|---|
| Product Type | 2-channel bipolar CMOS sound processor |
| Operating Supply Voltage | 4.5 V to 9.5 V |
| Channel Count | 2 channels |
| Package | 24-SSOP-A |
| Brand | ROHM Semiconductor |
| Process Technology | BiCMOS |
| Bass Filter Adjustment | External center-frequency and Q-factor components |
| Surround Processing | Available without external surround components |
| Mute Control | Input mute switch for crosstalk suppression |
| Power Consumption | Low-current design |
Bảo phân biệt quan trọng
- Adjustable analog bass characteristics (vsBD3872FS-E2)
- Crosstalk suppression through input mute control (vsBD3870FS-E2)
- Surround processing without external surround components (vsBD3870FS-E2)
Ghi chú thiết kế
Place the BD3871FS-E2 close to the external bass-network components and the analog audio signal path. Keep the 24-SSOP-A footprint clear of switching-regulator power loops, high-current speaker-amplifier traces, and digital return paths. Use a continuous ground plane and route the processor ground with low-impedance connections so that the 2-channel signal paths share a quiet reference.
Treat the adjustable bass section as part of the complete audio channel rather than treating the IC as an isolated block. The external center-frequency and Q-factor components determine the intended response, but source impedance, output loading, and the downstream amplifier can alter the result. Prototype each channel with the actual source and speaker or measurement load, and verify channel balance as well as bass amplitude.
Do not assume that any similarly named BD387x device is pin-compatible with the BD3871FS-E2. A valid substitution must match the 24-SSOP-A footprint, pin functions, 4.5 V to 9.5 V operating range, mute behavior, and surround implementation. In particular, compare the bass-filter and channel-control blocks before approving a replacement because similar product-family names do not guarantee identical functionality.
Use a stable low-noise supply within the 4.5 V to 9.5 V operating range and place local input bypass capacitance at the device supply pins. Because the exact recommended capacitor values and supply-current limits are defined in the manufacturer datasheet, follow those values rather than selecting capacitors solely from generic analog-design rules. Check supply startup behavior when the processor is used with muted or power-gated audio sources.
Thông tin tuân thủ
ROHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive-qualification status require confirmation from the applicable ROHM documentation for this exact ordering code.
