BD3873FS-E2 - 3-Band Audio Processor | ROHM | Home Audio
N.º de pieza: BD3873FS-E2 ✓ ActivoBD3873FS-E2 Descripción general
An audio sound processor is an analog signal-conditioning IC used between audio sources and a power amplifier. Within the broader semiconductor hierarchy, it belongs to the audio-processor and audio-special-purpose IC category rather than the general-purpose amplifier category. Its purpose is to select and condition multiple stereo inputs, adjust level and tone, and create a surround-sound effect before the signal reaches an external output amplifier.
The BD3873FS-E2 provides flexible bass characteristics through external components, allowing the center frequency and Q factor to be tailored rather than being fixed entirely inside the IC. A mute function on one input pin supports crosstalk suppression when an unused source is selected. The device also supports a surround function without additional external components and uses a BiCMOS process to combine bipolar and CMOS functions with low current consumption.
Two-wire serial control provides a compact interface for setting operating conditions, reducing the number of external controls needed in a compact audio system. This architecture is useful in boom boxes and mini-component systems, where multiple source inputs, volume, tone, balance-related functions, and surround processing must coexist without consuming excessive board area. The 4.5 V to 9.5 V supply range is compatible with conventional single-rail consumer-audio circuitry operating within that voltage range.
Typical applications include compact stereo systems, boom boxes, mini-component audio products, portable consumer-audio equipment, and small television or multimedia sound systems. In these systems, the BD3873FS-E2 can consolidate source selection and tone processing before the power-amplifier stage. Its integrated surround function can reduce external component count when a basic spatial-effect presentation is sufficient.
PCB design should preserve the intended analog signal path, maintain short connections around the input and output pins, and follow the manufacturer reference layout and external-component recommendations. The external bass network should be populated and evaluated with its documented resistance and capacitance values. Confirm that the selected two-wire control implementation and mute polarity match the host system before releasing the PCB.
This page consolidates the product-page features, package information, functional features, sourcing guidance, and practical integration considerations for the BD3873FS-E2. It also identifies the electrical and environmental parameters that require confirmation in the manufacturer datasheet before a new design is released.
Alternativas directas para BD3873FS-E2 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con BD3873FS-E2 (mismo factor de forma y huella) — difiere en Mute Function, Package.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasBD3873FS-E2 Valores máximos y características eléctricas
| Product Type | Two-channel audio sound processor |
| Built-in Equalizer | 3-band |
| Supply Voltage Range | 4.5 V to 9.5 V |
| Number of Audio Channels | 2 channels |
| Control Interface | 2-wire serial control |
| Process Technology | BiCMOS |
| Encapsulado | 24-SSOP-A, 5.4 mm |
| Tipo de montaje | Surface mount |
| Operating Ambient Temperature Range | -25 °C to +75 °C |
| Surround Processing | Supported without external components |
| Mute Function | Provided on one input pin for crosstalk suppression |
| Bass Equalizer Adjustment | Flexible center frequency and Q factor using external components |
| Integrated Functions | Input selector, input gain amplifier, volume, surround, bass, treble, and loud-speaker equalizer |
Guía de configuración de pines de BD3873FS-E2 24-ssop-a, 5.4 mm
Configuración de pines para BD3873FS-E2 (encapsulado 24-ssop-a, 5.4 mm). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para BD3873FS-E2.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
BD3873FS-E2 es adecuado para 6 aplicacións: Compact Home Stereo, Boom-Box Audio System, Mini-Component Stereo, Portable Consumer Audio, Multimedia Speaker System, Entry-Level AV Receiver Front End.
Compact Home Stereo
The BD3873FS-E2 fits a compact stereo system that combines source switching, level control, tone shaping, and surround processing ahead of a power amplifier. Its two-channel architecture and 4.5 V to 9.5 V supply range suit conventional single-rail consumer-audio designs. The integrated three-band equalizer, adjustable bass network, and external-component-free surround function reduce the amount of separate analog circuitry required. Place the processor close to the input selectors and follow the manufacturer's grounding and decoupling layout to minimize pickup between adjacent source channels.
Recomendado
Boom-Box Audio System
The BD3873FS-E2 is specifically suited to boom-box systems requiring multiple input functions in a constrained enclosure. It combines input selection, input gain, volume, surround, bass, treble, mute, and loud-speaker equalization within one sound processor. The 4.5 V to 9.5 V operating range supports common consumer-audio rails, while two-wire serial control reduces front-panel wiring complexity. Use the external bass components from the reference design and validate low-frequency response with the actual speaker enclosure because its acoustics strongly affect the final tonal result.
Recomendado
Mini-Component Stereo
The BD3873FS-E2 provides a practical signal-conditioning front end for a mini-component stereo where several sources must feed a shared amplifier. Its input selector and gain stages allow source-level matching before the volume and tone controls, improving control over the active path. The three-band equalizer and flexible bass network tailor the output to compact speakers, while the internal surround function offers a basic spatial effect without extra discrete circuitry. Follow the manufacturer reference layout to control analog noise and maintain stable behavior across the complete supply range.
Recomendado
Portable Consumer Audio
The BD3873FS-E2 can be used in portable or small-format consumer-audio equipment when the system operates within a 4.5 V to 9.5 V rail. Its BiCMOS implementation supports energy-saving operation, and its integrated functions reduce the component count compared with separate selector, tone, volume, and surround blocks. The two-wire serial interface is useful for a microcontroller or encoder-driven control panel. Battery-derived systems must include appropriate regulation and protection, and the final thermal and noise performance should be verified with the enclosure, speaker load, and selected external components.
Recomendado
Multimedia Speaker System
The BD3873FS-E2 is applicable to multimedia speaker and television-adjacent audio systems that need flexible tone correction for different listening positions or source types. Its adjustable bass characteristics allow the low-frequency network to be matched to the speaker, while treble and volume controls provide user adjustment. The mute input helps suppress crosstalk from an inactive source. Because the device is an analog sound processor rather than a power amplifier, connect its output to a suitable amplifier and observe the documented loading and signal-level requirements.
Recomendado
Entry-Level AV Receiver Front End
The BD3873FS-E2 can serve as the analog tone and source-control section of an entry-level audio system with limited board area. Its two-channel processing path, selectable inputs, adjustable gain, volume, surround, and three-band equalizer cover several functions normally spread across multiple blocks. Two-wire serial control enables centralized menu or panel operation. The implementation should follow the manufacturer pin definitions, maintain a quiet analog ground strategy, and account for the external bass network in the system-level headroom and clipping budget.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para BD3873FS-E2 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto |
|---|---|
| Package | 24-SSOP-A, 5.4 mm |
| Brand | ROHM Semiconductor |
| Product Type | Two-channel audio sound processor |
| Supply Voltage Range | 4.5 V to 9.5 V |
| Built-in Equalizer | 3-band |
| Control Interface | 2-wire serial control |
| Process Technology | BiCMOS |
| Operating Ambient Temperature Range | -25 °C to +75 °C |
| Surround Processing | Supported without external components |
| Mounting Type | Surface mount |
Notas de diseño
Use the ROHM reference layout as the basis for signal routing and grounding. Keep the processor's input-selection paths and output connections away from digital control traces where practical, provide local supply bypassing at the device pins, and return analog ground through the recommended low-impedance path. The BD3873FS-E2 combines multiple source paths and tone functions, so layout changes can create crosstalk that is difficult to correct with software or control settings.
Do not treat BD3870FS, BD3871FS, and BD3872FS as automatic replacements for BD3873FS-E2 merely because their names are similar. The family document identifies different equalizer and loud-speaker functions, and it does not establish identical control commands or pin assignments. Before changing the BOM, compare the complete pin-description table, control protocol, supply range, external-component network, and output loading requirements for the exact replacement ordering code.
Operate the processor within its documented 4.5 V to 9.5 V supply range and decouple each supply connection close to the device. Because the BD3873FS-E2 handles several analog signal paths and performs volume and tone processing, supply disturbance can become audible as level changes, channel imbalance, or unintended noise. Confirm startup voltage, source-selector transients, and the control sequence across the complete power range before production release.
Populate the external bass network with the component values specified by ROHM for the intended speaker impedance. The center frequency and Q factor are externally adjustable, so changing these parts can alter gain, phase margin, and low-frequency headroom rather than merely shifting a nominal cutoff. Measure the complete source-to-speaker response in the final enclosure and check that tone-control extremes do not create excessive clipping at the processor output.
Verify the mute polarity and the electrical state of every control pin during reset. The manufacturer places a mute switch on one input pin to suppress crosstalk, but incorrect reset states or floating control nodes can defeat that feature or create an audible transition. Define explicit reset defaults in the host firmware and test channel switching, mute release, volume changes, and surround-mode transitions with the final control encoder or microcontroller.
Información de cumplimiento
No specific RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations were identified for this ordering code. The device is an audio signal-processing IC and is not an automotive-qualified AEC-Q100 product in the available information.
