BD3861FS-E2 - 2-Channel Audio Signal Processor | ROHM
MPN： BD3861FS-E2 ⚠ 最後購買機會BD3861FS-E2 概覽
An audio sound processor is an analog integrated circuit that conditions multiple audio channels and provides programmable control functions in equipment such as mini-component stereo systems, boom boxes, compact audio products, and other consumer electronics. Within the broader signal-chain hierarchy, it belongs to the sound-processor IC family, works alongside audio amplifiers and source-selection circuits, and provides a centralized control interface between the system controller and analog audio paths.
The BD3861FS-E2 emphasizes signal-to-noise performance through a two-stage implementation of front-volume and rear-volume control. Its resistance-ladder volume and tone implementation is intended to provide low noise and low distortion, while the built-in three-band equalizer supports bass, midrange, and treble adjustment. The 2-wire serial interface reduces control-pin count compared with a parallel-control architecture and simplifies connection to a host controller.
ROHM identifies the device as a BiCOMS audio processor. The BD3861FS-E2 is specified for a 6.5 V to 9.5 V supply, an operating temperature range of -25 °C to +75 °C, and a 32-SSOP-A surface-mount package approximately 5.4 mm wide. The 32-pin package provides separate signal and control connections for a two-channel processor, although the complete pin map must be taken from the manufacturer datasheet before PCB routing or replacement.
Typical applications include compact stereo systems, boom boxes, mini-component audio equipment, portable audio products, and other two-channel products that require electronic volume and three-band tone control. The serial control interface is particularly useful where a system controller must adjust sound settings while keeping the front-panel wiring compact. In multi-source products, source-selection control can be coordinated with the processor rather than implemented entirely through a separate relay-based network.
Designers should confirm the serial protocol, command map, reset requirements, and control timing in the manufacturer datasheet. The audio path should be evaluated for gain structure, clipping, channel separation, and pop-noise behavior across the full input range. PCB layout should keep audio traces short, maintain a continuous ground reference, and isolate control signals from sensitive audio nodes to reduce coupling.
This product page organizes the confirmed operating information, lifecycle status, package details, family context, application guidance, and engineering trade-offs into one focused reference for evaluating the BD3861FS-E2 in new or existing stereo audio designs.
直接替換替代品，適用於 BD3861FS-E2 — 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。
此系列的變體
與下列產品可直接替換的同系列型號： BD3861FS-E2 （相同外形與佔位） — 差異在於 Control Interface, Lifecycle Status, Product Type.
此產品無可直接替換的替代品。
申請替代品BD3861FS-E2 最大額定值與電氣特性
| Product Type | Sound processor with built-in three-band equalizer |
| Audio Channel Count | 2 channels |
| Supply Voltage Range | 6.5 V to 9.5 V |
| Control Interface | 2-wire serial control |
| Equalizer Bands | 3 bands: bass, mid, and treble |
| Process Technology | BiCOMS process |
| 工作溫度範圍 | -25 °C to +75 °C |
| Package Type | 32-SSOP-A surface-mount package |
| Package Width | 5.4 mm |
| 腳位數 | 32 pins |
| 安裝類型 | Surface mount |
| Volume Control Architecture | Resistance-ladder circuit with two-stage front and rear volume configuration |
| Tone Control Architecture | Resistance-ladder circuit |
| RoHS 狀態 | Compliant |
| 生命週期狀態 | Last Time Buy; product discontinuation announced |
BD3861FS-E2 5.4 mm 腳位配置指南
BD3861FS-E2（5.4 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： BD3861FS-E2.
請參閱 資料表 以查看完整腳位配置。
典型應用
BD3861FS-E2 適用於 6 應用s: Mini-Component Stereo Systems, Boom-Box Audio Products, Portable Stereo Audio, Compact Radio and Media Player, Two-Channel Active Speaker, Home Audio Control Module.
Mini-Component Stereo Systems
The BD3861FS-E2 fits compact stereo products that need centralized volume, tone, and source-control functions for two channels. Its 6.5 V to 9.5 V operating range suits conventional low-voltage analog audio systems, while the 2-wire serial interface reduces control wiring between the sound processor and a host controller. The built-in three-band equalizer supports bass, midrange, and treble adjustment without requiring a separate passive tone network. During design, verify input and output levels, the serial command map, and the external-component values specified in the ROHM datasheet.
推薦
Boom-Box Audio Products
The BD3861FS-E2 is appropriate for portable or compact boom-box architectures requiring two-channel electronic volume control and tone adjustment. Its two-stage front-volume and rear-volume arrangement is designed to support high signal-to-noise performance, while the resistance-ladder volume and tone implementation targets low noise and low distortion. A system controller can use the 2-wire interface to change sound settings and source states. Engineers should prototype the complete signal path and check switching noise, channel balance, clipping margin, and behavior across the 6.5 V to 9.5 V supply range.
推薦
Portable Stereo Audio
A portable stereo product can use the BD3861FS-E2 when user-adjustable volume and three-band tone are needed close to the audio front end. The 2-wire serial control reduces the number of host-controller connections, while the two-channel architecture aligns with common left and right signal paths. The BiCOMS implementation and resistance-ladder control are intended to support low-noise, low-distortion operation. Layout work should keep audio routing compact, preserve a low-impedance ground plane, isolate the serial control trace, and confirm the external capacitor and resistor recommendations in the manufacturer documentation.
推薦
Compact Radio and Media Player
The BD3861FS-E2 can provide the shared volume and equalization stage in compact radio, cassette, CD, or media-player products. A host microcontroller can send commands over the 2-wire serial interface, allowing multiple internal sources to be presented through a controlled stereo output stage. The three-band equalizer provides basic bass, mid, and treble adjustment, and the resistance-ladder tone implementation is designed to limit distortion. Integration engineers should confirm source-selection behavior, signal levels, control polarity, and reset requirements directly from the manufacturer datasheet.
推薦
Two-Channel Active Speaker
An active-speaker controller can place the BD3861FS-E2 in the analog signal path to provide adjustable level and three-band tone before power amplification. Its two-channel organization supports symmetric left and right processing, and the low-voltage supply range is compatible with many portable audio power stages. The serial control interface allows volume and equalizer settings to be managed by a main controller rather than multiple mechanical potentiometers. Signal-chain validation should include amplifier input impedance, ground reference, crossover behavior, channel matching, and maximum operating level.
推薦
Home Audio Control Module
The BD3861FS-E2 is suitable for a dedicated analog audio-control module in a home stereo or compact entertainment system. Placing the processor ahead of the output amplifier allows source selection, electronic volume, and three-band equalization to be coordinated in one block. The 2-wire control interface is useful for space-constrained boards and reduces parallel-control routing. Designers should use the datasheet pin and application information to establish grounding, external timing components, and signal levels, then verify pop noise and distortion during volume transitions.
推薦
推薦產品摘要
工程參考資料，適用於 BD3861FS-E2 — 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 |
|---|---|
| Brand | ROHM Semiconductor |
| Package | 32-SSOP-A |
| Audio Channels | 2 channels |
| Supply Voltage Range | 6.5 V to 9.5 V |
| Control Interface | 2-wire serial control |
| Equalizer | Built-in 3-band equalizer |
| Process Technology | BiCOMS process |
| Operating Temperature | -25 °C to +75 °C |
| Lifecycle Status | Last Time Buy; discontinuation announced |
主要差異化特點
- Integrated three-band sound control (對比BD3883FS)
- Two-stage front and rear volume architecture (對比BD3403FV)
- Compact two-wire host-control interface (對比A parallel-control architecture)
設計說明
Place the BD3861FS-E2 close to the audio-source switching and output-amplifier stages to minimize sensitive analog trace length. Maintain a continuous ground reference beneath and around the device, use the shortest practical connections for audio paths, and route the 2-wire serial signals away from high-impedance audio nodes. Follow the manufacturer application diagram for external resistance and capacitance values rather than substituting values from unrelated audio processors.
Evaluate the complete two-channel path for clipping, gain staging, channel matching, and switching transients. The resistance-ladder volume and tone architecture is intended to provide low noise and low distortion, but actual performance also depends on source impedance, load impedance, external component selection, and grounding. Measure noise and distortion at multiple volume settings because the operating point can change the contribution of each stage.
Design the 6.5 V to 9.5 V supply rail with adequate transient margin and local decoupling at the device. Confirm the pin assignments and recommended capacitor values in the ROHM datasheet before layout because storage, solder, and output impedance can create additional transients. Check both the minimum and maximum operating-supply conditions, including startup behavior and system power-down sequences, before approving the board.
Do not treat BD3861FS and BD3861FS-E2 as interchangeable solely from their similar names. Confirm the manufacturer ordering table, tape-and-reel orientation, package marking, and operating limits. The family has also been announced for discontinuation, so a cross-design substitution must address lifecycle availability as well as pinout, serial protocol, equalizer functions, and audio-level compatibility.
合規資訊
RoHS compliance is identified for the BD3861FS family in the cross-reference information. No automotive qualification or additional environmental-compliance claim is established.
