BD3870FS-E2 - 2-Channel BiCMOS Audio Processor | ROHM
Teilenummer: BD3870FS-E2 ✗ AbgekündigtBD3870FS-E2 Übersicht
An audio sound processor is a mixed-signal IC positioned between source selection and the power-amplifier stage of a home-audio or compact-audio system. It conditions left and right channel signals and applies gain, tonal balance, surround, and loudspeaker-response functions. Within the broader hierarchy, the BD3870FS-E2 belongs to the audio processor family of analog and mixed-signal integrated circuits, rather than to a power-amplifier category. This distinction matters because its outputs are intended to drive a downstream audio amplifier rather than directly power a loudspeaker.
The manufacturer highlights flexible bass characteristics using external components, allowing the center frequency and Q factor to be adjusted according to the speaker system. A mute function assigned to one input pin supports crosstalk suppression during source changes. A surround function can also be implemented without external components. These features make the IC useful in boom boxes, mini-component systems, home-audio products, and other designs requiring programmable tonal shaping within a compact circuit footprint.
The BiCMOS process combines bipolar and CMOS circuit technologies, supporting analog signal processing together with low-power digital control functions. Two-wire serial control is particularly useful when a system uses a microcontroller or digital control interface: the host controller can set operating states and sound parameters through a compact command path. Exact internal gain, control-voltage timing, and output-routing details should be taken from the BD3870FS, BD3871FS, BD3872FS, and BD3873FS datasheet before final circuit design.
Typical uses include two-channel input selection in mini hi-fi systems, bass and treble adjustment, surround processing for home-audio equipment, and loudspeaker equalization in compact speaker products. Because the device is an audio signal processor rather than a power amplifier, the design must include downstream amplification with adequate output power and appropriate input impedance.
For PCB implementation, preserve the pin assignments and exposed-pad requirements of the exact ordering code, place input and output return paths away from switching-power nodes, and decouple the supply pins close to the device. Confirm absolute maximum ratings, recommended operating conditions, external-component values, and the required support-component topology from the manufacturer datasheet before release to production.
This product page consolidates the confirmed function, supply range, package information, control architecture, sourcing entry point, and practical design considerations for BD3870FS-E2. It also distinguishes strict footprint-compatible alternatives from related family members that require different circuit or package arrangements, helping engineers assess replacement options without changing the PCB unknowingly.
Drop-in-Alternativen für BD3870FS-E2 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit BD3870FS-E2 (gleiche Bauform und Footprint) – abweichend in Mute Function, Package, Product Type, Surround Processing.
BD3871FS-E2
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →BD3870FS-E2 Grenzwerte & elektrische Eigenschaften
| Product Type | Two-channel audio sound processor |
| Manufacturer | ROHM Semiconductor |
| Number of Channels | 2 channels |
| Supply Voltage Range | 4.5 V to 9.5 V |
| Process Technology | BiCMOS |
| Control Interface | 2-wire serial control |
| Integrated Functions | Input selector, input gain amplifier, volume, surround, bass, treble, and loudspeaker equalizer |
| Equalizer Bands | 2-band equalizer |
| Bass Adjustment | Externally adjustable center frequency and Q factor |
| Surround Processing | Can be constructed without external components |
| Mute Function | Available on one input pin for crosstalk suppression |
| Gehäuse | 24-pin SSOP-A |
| Montageart | Surface mount |
| RoHS-Status | Compliant |
BD3870FS-E2 24-pin ssop-a Pinbelegungsleitfaden
Pinbelegung für BD3870FS-E2 (24-pin ssop-a-Gehäuse). Dieses analoge Bauteil verfügt über Eingangs-, Ausgangs- und Versorgungspins. Offset-Null-, Kompensations- und Enable-Pin-Konfigurationen entnehmen Sie dem Herstellerdatenblatt. Ideal für Signalaufbereitung und Verstärkerschaltungen.
Keine detaillierten Pinbelegungsdaten verfügbar für BD3870FS-E2.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
BD3870FS-E2 ist geeignet für 6 Anwendungs: Two-Channel Mini Hi-Fi System, Boom-Box Audio Control, Home-Audio Surround Processor, Loudspeaker Equalization, Stereo Source-Selection Front End, Multimedia Speaker Signal Conditioning.
Two-Channel Mini Hi-Fi System
The BD3870FS-E2 fits the central signal-processing position in a compact two-channel home-audio system because it combines source selection, input gain, volume, surround, bass, treble, and loudspeaker equalization in one 24-pin SSOP-A device. Its two-wire serial-control architecture also simplifies coordination with a system controller. Operating from 4.5 V to 9.5 V suits compact low-voltage equipment, while the two processed channels feed a separate power amplifier. The design should follow the manufacturer reference circuit for external equalizer components and output loading.
Empfohlen
Boom-Box Audio Control
BD3870FS-E2 is designed for boom-box and mini-component systems that require programmable tone and speaker-response functions in a small circuit area. It provides two-channel processing, adjustable bass characteristics through external components, surround processing without external components, and a mute input for crosstalk suppression. The 4.5 V to 9.5 V operating range aligns with low-voltage portable-audio systems. A system microcontroller can use the 2-wire interface to coordinate source changes and sound settings, while downstream amplification supplies the loudspeaker drive current.
Empfohlen
Home-Audio Surround Processor
The BD3870FS-E2 can add surround processing and tonal shaping to a home-audio signal path without implementing each function with separate analog blocks. Its surround function can be constructed without external components, while external components allow the bass center frequency and Q factor to be adjusted for the selected speaker system. This makes the device useful when a compact design needs more flexibility than fixed passive tone controls. Pair the processed outputs with an amplifier suitable for the intended speaker impedance and validate the surround mix in the final acoustic enclosure.
Empfohlen
Loudspeaker Equalization
BD3870FS-E2 supports loudspeaker equalization within compact audio products by combining adjustable bass characteristics, treble control, and volume functions in the same processing channel. External bass components permit center-frequency and Q-factor adjustment, allowing the response to be adapted more closely to the enclosure and drivers. The IC does not measure speaker response automatically, so the equalization values must be established through acoustic tuning or a test setup. Use the manufacturer circuit values as the starting point and avoid duplicating an aggressive passive crossover in the signal path.
Empfohlen
Stereo Source-Selection Front End
BD3870FS-E2 can serve as the source-selection and level-control front end in a stereo audio product with several input sources. The integrated input selector, input-gain amplifier, mute function, and volume control provide the basic signal chain before power amplification. Assigning mute control to an input pin helps suppress crosstalk during source transitions, while two-wire control reduces wiring between the audio device and its host controller. Verify the input impedance, allowed source levels, and control timing from the BD3870FS datasheet for each source connected to the device.
Empfohlen
Multimedia Speaker Signal Conditioning
BD3870FS-E2 is useful in multimedia speaker products that require independent left- and right-channel tone adjustment, source switching, and surround enhancement within a low-voltage design. The two-channel BiCMOS processor handles signal conditioning from 4.5 V to 9.5 V, while its serial control permits a host controller to adjust operating modes. The output should drive a power amplifier rather than the speakers directly. Place the processor away from display, motor, and switching-supply return paths to reduce the chance of audible noise or control corruption.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für BD3870FS-E2 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | BD3871FS-E2 |
|---|---|---|
| Package | 24-pin SSOP-A | 24-pin SSOP |
| Brand | ROHM Semiconductor | ROHM Semiconductor |
| Product Type | Audio sound processor | Audio sound processor |
| Channel Count | 2 channels | 2 channels |
| Process Technology | BiCMOS | BiCMOS |
| Control Interface | 2-wire serial control | 2-wire serial control |
| Lifecycle Status | unknown | unknown |
Wichtigste Unterscheidungsmerkmale
- Combines several stereo audio functions in one processor (vs. BD3871FS-E2)
- Supports flexible bass tuning with external components (vs. BD3871FS-E2)
- Includes input mute for crosstalk suppression (vs. BD3871FS-E2)
Designhinweise
Assign every connection from the BD3870FS-E2 package drawing and pin-description table before routing the PCB. Keep the 4.5 V to 9.5 V supply and ground connections short, place bypass capacitors beside their associated pins, and maintain continuous return paths beneath analog signal routes. Because the part controls both sensitive audio inputs and low-level processed outputs, avoid sharing narrow traces with switching-power or speaker-return currents.
Treat source selection, mute, gain, surround, and equalization as one coordinated analog signal chain. Establish reference ground and source impedance according to the manufacturer application circuit, and check each input for overload during source changes. The mute function can reduce crosstalk, but it does not replace correct grounding or impedance matching. Confirm the 2-wire control timing so that gain and filter changes do not create audible transients.
Do not use BD3870FS-E2 as a direct loudspeaker driver. It is a sound processor and requires a downstream power amplifier with suitable channel count, supply range, and speaker-load capability. Also verify that a proposed replacement uses the same 24-pin footprint and pin functions; the related 32-pin BD3872FS-E2 cannot be installed on the original 24-pin land pattern. Use the exact ordering code and package drawing during review.
Compliance-Informationen
The cross-reference comparison identifies BD3870FS-E2 as RoHS compliant. No explicit REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statement was found.
