BD3818KS - 6-Channel 5.1ch Audio Processor | ROHM
MPN： BD3818KS ✓ 啟用中BD3818KS 概覽
An audio sound processor is a specialized semiconductor that controls and conditions multiple audio channels before they reach amplifiers or transducers. Within the broader product hierarchy, the BD3818KS belongs to the audio signal processor class, which is distinct from a power amplifier. Its role is to select sources, set channel levels, apply tone and dynamic-bass functions, and combine the resulting channels into a usable 5.1-channel signal path.
The principal functions documented for the BD3818KS include independent six-channel master volume, a five-channel input selector, a gain amplifier, bass control, treble control, mixing, and dynamic bass boost. The mode and input selectors allow an audio system to route selected sources more flexibly than a fixed analog mixer. The 1 dB volume-step resolution provides finer level adjustment than a continuously variable control implemented solely with external passive components.
The BD3818KS and BD3811K1 share the same 5.1-channel sound-processor concept and integrated mode and input selectors. The BD3818KS adds mixing and dynamic bass boost, while the BD3811K1 uses bass boost instead. This distinction is important when comparing the two parts because their control features are not interchangeable even though both devices are associated with the same family documentation.
Typical uses include home-theater preamplifier and selector boards, multichannel amplifier control systems, car-audio controllers, and powered speakers that require centralized channel-volume and tone adjustment. The device is intended for systems in which source selection, channel balance, and low-frequency enhancement are implemented digitally or through a remote-control bus rather than by discrete potentiometers.
A successful design should preserve the recommended analog signal path, connect decoupling capacitors close to the supply pins, and route all six channels consistently to the downstream amplifier inputs. Designers should also verify the exact control logic, reference-voltage requirements, supported input levels, and unused-pin treatment against the manufacturer datasheet before releasing production artwork.
This page consolidates the verified product identity, package information, distributor availability references, function summary, family comparison, and design considerations for the BD3818KS. It also identifies which electrical, pin-level, pricing, compliance, and lifecycle details still require confirmation from the original manufacturer documents.
直接替換替代品，適用於 BD3818KS — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品BD3818KS 最大額定值與電氣特性
| Product Type | 5.1ch sound processor |
| Device Classification | Audio signal processor |
| Number of Channels | 6 channels |
| Input Selector | 5 channels |
| Master Volume Range | 0 to -95 dB |
| Volume Step | 1 dB per step |
| Mute Function | Supported |
| Integrated Functions | Mode selector, input selector, gain amp, bass, treble, mixing, dynamic bass boost |
| Supply Voltage Range | 10 V to 14.8 V |
| Package Type | 80-SQFP |
| Package Dimensions | 14 mm x 14 mm |
| 安裝類型 | Surface mount |
BD3818KS 14 mm x 14 mm 腳位配置指南
BD3818KS（14 mm x 14 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： BD3818KS.
請參閱 資料表 以查看完整腳位配置。
典型應用
BD3818KS 適用於 6 應用s: Home-Theater Preamp Controller, Multichannel Power-Speaker Control, Car-Audio Head-Unit Interface, Multi-Zone Residential Audio, Powered-Speaker Subwoofer Control, Audio Selector and Mixing Board.
Home-Theater Preamp Controller
The BD3818KS fits a home-theater preamplifier control board that must coordinate a 5.1-channel signal path and support source selection. Its documented five-channel input selector provides centralized routing, while the six-channel volume control covers front-left, front-right, center, surround-left, surround-right, and subwoofer levels from 0 to -95 dB in 1 dB increments. Integrated bass, treble, mixing, and dynamic bass boost allow system-level tuning without replacing the main signal-processing chain with separate controls. Designers should place the processor before the power-amplifier stages, maintain the documented analog reference and supply requirements, and verify every signal and control connection against the 80-SQFP pin table.
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Multichannel Power-Speaker Control
The BD3818KS can serve as the central controller in a powered-speaker or multichannel amplifier input stage. The 5.1-channel architecture allows a single IC to coordinate channel selection and attenuation before signals reach separate left, right, center, surround, and subwoofer amplifiers. Its 1 dB volume increments provide repeatable level matching between channels, while bass, treble, mixing, and dynamic bass boost add user-adjustable tonal controls. The processor should be placed so that its outputs drive high-impedance amplifier inputs rather than speaker loads directly. Decoupling must be placed close to the supply pins, and the layout should keep the audio channels separated from switching regulators and digital control wiring to minimize noise coupling.
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Car-Audio Head-Unit Interface
The BD3818KS is applicable to a car-audio head unit or external 5.1-channel controller that requires centralized source routing, channel balance, tone adjustment, and dynamic low-frequency enhancement. Its verified 10 V to 14.8 V operating range is compatible with a regulated 12 V automotive architecture when input transients and ground noise are controlled. Integrated five-channel input selection reduces the need for a separate mechanical input-selector network, while independent six-channel attenuation supports balanced front, center, surround, and subwoofer levels. Automotive qualification was not present in the supplied records, so production designs require confirmation of ROHM qualification, temperature limits, load dump protection, and transient tolerance for the exact device and ordering code.
推薦
Multi-Zone Residential Audio
The BD3818KS can support a multi-zone residential audio controller when the design requires a common 5.1-channel source bus with centralized mode selection and individual channel attenuation. The five-channel input selector allows several source paths to be selected before mixing, while the six-channel volume section provides consistent level control across the main theater channels and subwoofer. Tone, mixing, and dynamic bass boost can be used for calibration or user presets rather than requiring separate rotary controls in every zone. Integration is most practical where the downstream amplifiers accept line-level signals. Engineers should validate the control-command protocol, reference-voltage arrangement, control update timing, and output loading directly from the manufacturer documentation before finalizing the system architecture.
推薦
Powered-Speaker Subwoofer Control
The BD3818KS can be used in a powered-speaker design where subwoofer level must be coordinated with the main 5.1-channel audio system. Independent six-channel volume control permits the subwoofer channel to be balanced against the front, center, and surround channels rather than controlled only by the source device. Dynamic bass boost and bass adjustment provide system-level low-frequency controls, while mute and 1 dB attenuation steps make setup repeatable. The sound processor should be placed upstream of the subwoofer amplifier and should not be treated as a speaker driver. Signal-integrity practices include short analog traces, adequate supply decoupling, separate return-current routing for switching stages, and confirmation of the required output level and impedance from the authoritative datasheet.
推薦
Audio Selector and Mixing Board
The BD3818KS suits a dedicated audio selector and mixing board that combines multiple source inputs with a configurable 5.1-channel output. Its documented mode selector and five-channel input selector handle routing, while the integrated mixing function allows selected audio channels to be combined before downstream amplification. The gain amplifier, bass, treble, and dynamic bass boost stages provide additional user controls without requiring a separate bank of analog tone circuits. The device is particularly useful in installations where source selection and user adjustments are handled through a remote-control bus rather than front-panel potentiometers. Before PCB release, engineers should confirm the logical control states, mute behavior, channel signal levels, resistor values, and bypass or initialization sequence specified by ROHM.
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推薦產品摘要
工程參考資料，適用於 BD3818KS — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Device Type | 5.1ch sound processor |
| Channel Count | 6 channels |
| Input Selector | 5-channel input selector |
| Master Volume Range | 0 to -95 dB |
| Volume Resolution | 1 dB per step |
| Supply Voltage Range | 10 V to 14.8 V |
| Integrated Processing | Gain amp, bass, treble, mixing, and dynamic bass boost |
| Package | 80-SQFP, 14 mm x 14 mm |
| Brand | ROHM Semiconductor |
主要差異化特點
- Combines six-channel volume with integrated dynamic bass boost (對比BD3811K1)
- Provides a five-channel input selector in a 5.1-channel processor (對比BD3811K1)
- Uses discrete 1 dB master-volume attenuation (對比BD3811K1)
設計說明
Place all supply-decoupling capacitors directly beside the corresponding 80-SQFP power pins, with the shortest possible return path to the ground plane. Keep the processor and its reference components away from switching-regulator inductors, high-current MOSFET stages, and fast digital interfaces. Because the six audio channels are sensitive to shared ground impedance, use a quiet analog ground region and connect it to the main ground at a controlled, low-impedance point.
Route the six processed audio channels as short, continuous traces and avoid passing them beneath power inductors, relay contacts, or digital clock lines. Maintain consistent spacing between adjacent channels where practical and provide a solid ground reference beneath the analog section. Verify the exposed-pad or thermal and electrical requirements for the exact 80-SQFP footprint from the ROHM package drawing; the 14 mm by 14 mm body size alone is not sufficient to reproduce the land pattern safely.
The BD3818KS performs channel selection, attenuation, tone adjustment, mixing, and dynamic-bass processing, so each supported channel must have the correct source impedance and termination. Do not add undocumented gain or filtering stages between the processor and downstream amplifiers unless the signal levels have been checked against the datasheet. Confirm mute behavior, channel ramp behavior, reference-voltage stability, and control-command timing with the manufacturer documentation before enabling audio during system start-up.
Do not substitute the BD3811K1 solely because it appears in the same family document. According to the ROHM datasheet, the BD3811K1 provides bass boost while the BD3818KS provides mixing and dynamic bass boost, so their feature sets differ. A functional substitution must also match the 80-SQFP pinout, supply range, control interface, channel routing, volume behavior, and external component values; generic six-channel volume controllers are not automatically drop-in replacements.
合規資訊
The supplied verified excerpts do not contain explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification statements for BD3818KS. AEC-Q100 is recorded as not_applicable because no qualified automotive variant was identified in the provided data, not because the device was proven unsuitable for automotive use.
