BD3871FS-E2 - 2-Channel Audio Processor | ROHM
MPN: BD3871FS-E2 ✓ نشطBD3871FS-E2 نظرة عامة
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.
بدائل مباشرة لـ BD3871FS-E2 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع BD3871FS-E2 (نفس عامل الشكل والبصمة) — يختلف في Mute Function, Package, Product Type, Surround Processing.
لا تتوفر بدائل متوافقة تمامًا لهذا المنتج.
اطلب بدائلBD3871FS-E2 الحدود القصوى والخصائص الكهربائية
| Product Type | 2-channel bipolar CMOS sound processor |
| جهد التغذية التشغيلي | 4.5 V to 9.5 V |
| Channel Count | 2 channels |
| Process Technology | BiCMOS |
| العلبة | 24-SSOP-A |
| نوع التركيب | 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 |
دليل تكوين أطراف BD3871FS-E2 24-ssop-a
تكوين الأطراف لـ BD3871FS-E2 (حزمة 24-ssop-a). تتضمن هذه الدائرة المتكاملة الرقمية GPIO وواجهات الاتصال (UART وSPI وI2C) وأطراف الطاقة. راجع ورقة بيانات الشركة المصنعة لوظائف الأطراف البديلة وخيارات التكوين. ضرورية لتصميم الأنظمة المدمجة وتخطيط PCB.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ BD3871FS-E2.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
BD3871FS-E2 مناسب لـ 6 التطبيقs: 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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ BD3871FS-E2 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| 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 |
أبرز الفروقات
- Adjustable analog bass characteristics (مقابلBD3872FS-E2)
- Crosstalk suppression through input mute control (مقابلBD3870FS-E2)
- Surround processing without external surround components (مقابلBD3870FS-E2)
ملاحظات التصميم
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.
معلومات الامتثال
ROHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive-qualification status require confirmation from the applicable ROHM documentation for this exact ordering code.
