BD3872FS-E2 - 2-Channel 3-Band Audio Signal Processor, SSOP-24 | ROHM Semiconductor
Артикул: BD3872FS-E2 ✓ АктивенBD3872FS-E2 Обзор
An audio sound processor is a signal-conditioning IC placed between a source (tuner, DAC, cassette or optical deck) and a power amplifier. Its job is to shape the spectrum and level of the audio path rather than to amplify power. Within the product hierarchy, the BD3872FS-E2 sits as an analog audio processor, a sub-class of audio signal processor, itself part of the broader family of interface ICs and signal-conditioning semiconductors.
Key features of the BD3872FS-E2 include a three-band equalizer per channel with bass characteristics tunable through external components, so center frequency and Q factor can be set by the board designer. A mute function is provided on one of the input pins to suppress cross-talk between channels, and a surround-sound function can be realized without external components. The BiCMOS process technology used in the device keeps current consumption low, which matters in battery-fed and vehicle-installed equipment where quiescent drain translates directly into standby current.
Because the equalizer network is set by discrete external components, the same silicon can be re-tuned per product variant: a consumer home-theater set can be voiced for deep bass while a car amplifier line can be voiced for cabin acoustics. The built-in surround function allows a two-channel source to be expanded into a cinema-surround presentation without adding external matrix circuitry.
Typical applications include car audio head-unit tone control, home theater and cinema surround processing, AV receiver channel equalization, active speaker and mini-system input conditioning, and portable consumer audio products. When laying out the board, keep the input and output routing short and place the equalizer resistors and capacitors close to their associated pins to minimize stray pickup of switching noise. Note that the E2 suffix denotes the tape-and-reel packing option with a standard reel quantity of 2,000 pieces.
Аналоги без доработки для BD3872FS-E2 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с BD3872FS-E2 (тот же форм-фактор и посадочное место) — отличается по Mute Function, Package.
BD3871FS-E2
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Открыть даташит →BD3873FS-E2
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Открыть даташит →BD3872FS-E2 Максимальные параметры и электрические характеристики
| Категория | Audio Special Purpose / Audio Signal Processor |
| Number of Channels | 2 channels |
| Функция | 3-band equalizer sound processor |
| Supply Voltage Range | 4.5 V to 9.5 V |
| Process Technology | BiCMOS |
| Корпус | 24-SSOP-A (SSOP-24 / PDSO24) |
| Тип монтажа | Surface Mount |
| Packing Option | E2 = Tape and Reel, 2000 pcs per reel |
| Equalizer Bands | 3 bands per channel (bass, mid, treble) |
| Bass Tuning | Center frequency and Q factor set by external components |
| Mute Function | Mute switch on one input pin for cross-talk suppression |
| Surround Function | Cinema surround function realized without external components |
| Статус RoHS | Compliant |
| Количество выводов | 24 pins |
| Tape Direction of Feed | 1 pin of product at upper left when reel is held on the left and tape is pulled out to the right |
| Carrier Tape Pitch | 13.6 mm +/- 0.2 mm |
| Component Pitch | 0.8 mm |
| Height | 0.36 mm +/- 0.1 mm (max 0.45 mm) |
| Lead Free Soldering | Reflow (E2 packing option) |
Руководство по цоколевке BD3872FS-E2 в корпусе 24-ssop-a (ssop-24 / pdso24)
Цоколевка для BD3872FS-E2 (корпус 24-ssop-a (ssop-24 / pdso24)). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для BD3872FS-E2.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
BD3872FS-E2 подходит для 6 применениеs: Car Audio Head-Unit Tone Control, Home Theater Cinema Surround Processing, Multichannel AV Receiver Input Conditioning, Active Speaker and Mini-System Input Conditioning, Battery-Powered Portable Audio Products, Cinema Surround Simulation from Two Channels.
Car Audio Head-Unit Tone Control
The BD3872FS-E2 fits directly into the signal path of a car audio head unit, between the tuner or source output and the line-level input of the power amplifier stage. Its 4.5 V to 9.5 V operating range matches the 5 V rail used in head units, and the BiCMOS process keeps standby current low, which matters on a vehicle battery. Each channel carries a three-band equalizer, so bass, midrange and treble can be trimmed per channel to compensate for cabin acoustics and speaker placement. Because the bass center frequency and Q factor are set by external components, one silicon can be re-voiced across several vehicle trim levels. The mute switch on one input pin gives the designer direct control over cross-talk between the left and right paths during source switching, a common nuisance in car decks.
Рекомендуется
Home Theater Cinema Surround Processing
The BD3872FS-E2 is used in home theater preamplifiers and cinema-style surround decoders to shape a two-channel source into a wider presentation. The manufacturer documentation describes a surround function that can be constructed without external components, which reduces the external component count and board area compared with discrete matrix networks. Processing both channels independently allows bass and treble corrections that differ between the left and right speaker positions. The 24-SSOP-A package keeps the footprint compact for tight consumer chassis layouts, and the external bass tuning components give the acoustic team per-model voicing freedom. Feeding the equalizer outputs into the preamp volume stage preserves the noise performance of the source, since the processor performs frequency shaping without adding high-gain stages.
Рекомендуется
Multichannel AV Receiver Input Conditioning
In an AV receiver, multiple analog source inputs converge before the power amplifier matrix. The BD3872FS-E2 provides a compact two-channel processing path for sources that need per-channel level and tonal balance, such as a legacy analog deck or a line-level accessory input. The three-band structure lets a technician correct the exaggerated bass of a particular source without altering the others, and the mute capability on an input pin provides clean source isolation during switching. Its modest supply requirement means it can sit on the same 5 V or 9 V rail as the surrounding analog stages, simplifying the power tree. Because the device is analog rather than a digital equalizer, there is no DAC conversion step, so latency stays negligible and the signal path remains short.
Рекомендуется
Active Speaker and Mini-System Input Conditioning
Compact active speakers and mini systems often lack per-product tuning resources, so a small tone-shaping IC at the input of the internal amplifier makes system voicing practical. The BD3872FS-E2 handles two channels in a single 24-SSOP-A package, which fits the limited board area of a bookshelf or desktop system. External resistor and capacitor selection defines the bass center frequency and Q factor, allowing the same device to cover different cabinet volumes and driver responses. The low current consumption associated with the BiCMOS implementation keeps auxiliary-powered designs efficient in standby. The mute function on an input pin supports source isolation, and the processed outputs drive the preamplifier stage of the speaker module with minimal loss of headroom.
Рекомендуется
Battery-Powered Portable Audio Products
Portable and battery-powered audio products need every milliamp of the budget justified, and the BD3872FS-E2 was built on a BiCMOS process specifically to hold current consumption low. At a 4.5 V minimum operating voltage the device can run directly from a single cell plus boost stage or from a regulated 5 V rail already present in the product. The equalizer section provides tonal shaping without the power cost of an active filter or a digital signal processor, which would add clocking and conversion overhead. Both channels are processed in parallel on the same package, so a stereo product needs only one device for the full signal path. The result is a compact, low-power tone control stage suited to portable radios, personal stereos and small speaker systems.
Рекомендуется
Cinema Surround Simulation from Two Channels
The BD3872FS-E2 is used to build a cinema surround effect from an ordinary two-channel source. The manufacturer documentation shows a dedicated application to cinema surround in which the built-in surround function is engaged without external matrix components, which cuts the component count compared with a discrete approach. The processor shapes the low and high bands while the surround element is derived internally, giving the listener a wider presentation from two speakers. Because the equalizer is analog, the effect is applied with negligible latency, which is important for lip-sync in home theater playback. External bass tuning components let the same design be adjusted to small desktop speakers or full-size floorstanders, keeping the surround balance coherent with the main channels.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для BD3872FS-E2 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | BD3871FS-E2 | BD3873FS-E2 |
|---|---|---|---|
| Package | 24-SSOP-A (SSOP-24 / PDSO24) | 24-SSOP-A - same family footprint | 24-SSOP-A - same family footprint |
| Brand | ROHM Semiconductor | ROHM Semiconductor | ROHM Semiconductor |
| Number of Channels | 2 channels | 1 channel | 3 channels |
| Supply Voltage Range | 4.5 V to 9.5 V | 4.5 V to 9.5 V (same family) | 4.5 V to 9.5 V (same family) |
| Equalizer Bands | 3 bands per channel | 3 bands (same family) | 3 bands (same family) |
| Process Technology | BiCMOS | BiCMOS | BiCMOS |
| Mute Function on Input Pin | Yes, for cross-talk suppression | Yes (same family) | Yes (same family) |
| Surround Function | Yes, realizable without external components | Yes (same family) | Yes (same family) |
| Bass Tuning | Center frequency and Q factor set by external components | Center frequency and Q factor set by external components | Center frequency and Q factor set by external components |
| Related Family Part BD3870FS-E2 | 24-SSOP-A, 2 channels | 24-SSOP-A, 1 channel | 24-SSOP-A, 3 channels |
Ключевые отличия
- Two-channel three-band equalizer with externally adjustable bass center frequency and Q factor in one 24-SSOP-A device (против BD3871FS-E2)
- Surround function realized without external components (против BD3871FS-E2)
- Mute function brought out on an input pin for cross-talk suppression (против BD3873FS-E2)
Заметки по проектированию
Route the audio inputs and outputs as short, matched traces on a continuous ground plane, and place the equalizer resistors and capacitors directly at their associated pins. The bass section center frequency and Q factor are set by external components, so their placement directly determines the tuned response; long traces add parasitic capacitance that shifts the resonance away from the calculated value. Keep the mute and surround routing away from the amplifier output and power stage switching nodes to avoid pickup of switching noise into the shaped signal.
The BD3872FS-E2 works from 4.5 V to 9.5 V, so place the bypass capacitors at the supply pins as close to the package as practical. Because the BiCMOS implementation is used for low current consumption, decouple the analog supply rail locally and keep the return current path short to the supply pin rather than sharing a long path with the power amplifier current. In a dual-rail car audio design, regulate the 12 V battery rail down to 5 V for this device with a low-noise supply stage so the regulator switching ripple does not modulate the equalized output.
Do not treat a single-channel or three-channel family member as an automatic drop-in for a two-channel board. The BD3871FS-E2 halves the processed channel count and the BD3873FS-E2 adds a third, so channel count and the mute and surround functions must be re-checked against the original design intent. Also confirm the lead count of the package variant on hand: the related BD3870FS-E2 member is offered in a 32-pin PDSO32 package and will not fit a 24-pin land pattern.
The mute function is brought out to an input pin for cross-talk suppression between channels. Keep that control trace away from high-impedance audio input nets and from any switching node in the surrounding amplifier, since a high-impedance node next to a fast edge can pick up a coupling spike that audibly clicks on mute release. If the mute is driven by a microcontroller, use a series resistor at the pin and a pull-down so the channel defaults to a defined state during reset and firmware download.
Информация о соответствии
RoHS compliance is listed for the BD3872FS family in distributor cross-reference records. The E2 packing option corresponds to a lead-free reflow soldering process. No automotive qualification, halogen-free declaration or conflict-minerals statement was found for this part.
