BD37515FS-E2 - I2C Car Audio Sound Processor | ROHM
MPN： BD37515FS-E2 ✗ 停產BD37515FS-E2 概覽
An automotive sound processor is an analog audio-control IC that sits between source inputs and the power amplifier or system output stage. Its function hierarchy is sound processor, audio processor, audio signal-processing IC, and integrated circuit. This category combines source selection, volume control, tone shaping, and fader distribution into one device, reducing the number of discrete controls and the amount of board space required in a car-audio head unit.
The BD37515FS-E2 uses advanced switch circuitry to reduce switching noise associated with input gain, mute, main volume, fader volume, bass, treble, and loudness adjustment. It also includes built-in ground-isolation amplifier inputs for external stereo signals and an input-gain controller intended to reduce switching noise associated with portable-audio input volume. These functions support centralized control of multiple audio paths through the I2C bus.
The two-band equalizer provides bass and treble adjustment in a single sound-processing IC, while loudness processing compensates for the perceived response of the human ear at lower listening levels. The 4-channel stereo input selector accommodates several source choices, and the five-channel fader-volume function distributes level control across multiple audio outputs. Centralizing these controls allows software to manage source changes and volume transitions more consistently than a bank of independent mechanical controls.
Typical uses include automotive head units, car-audio control units, external portable-media-source interfaces, and multi-zone vehicle audio systems. Its 7 V to 9.5 V operating range aligns with conventional automotive entertainment subsystems, while the I2C interface reduces the number of direct host-controller connections needed for register-based configuration and control.
Designers should check the pin-description table and application circuit in the manufacturer datasheet before assigning signals or selecting external components. The sound processor requires suitable bypass capacitors, suitable audio input and output signal levels, and careful grounding to preserve low-noise operation. PCB planning should also account for the 20-pin SSOP footprint and keep sensitive audio paths away from switching and digital-control return currents.
This page combines the manufacturer’s operating information, lifecycle status, functional feature set, application guidance, and sourcing context into a compact engineering reference. It also distinguishes verified drop-in replacements from broader cross-reference tools, helping buyers determine whether the legacy BD37515FS-E2 remains appropriate for maintenance, redesign, or an existing production program.
直接替換替代品，適用於 BD37515FS-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： BD37515FS-E2 （相同外形與佔位） — 差異在於 Product Type, Control Interface, Equalizer Bands, Package, Input Gain Control.
此產品無可直接替換的替代品。
申請替代品BD37515FS-E2 最大額定值與電氣特性
| Product Type | Automotive audio sound processor |
| Operating Voltage Range | 7 V to 9.5 V |
| Control Interface | I2C bus |
| Equalizer Bands | 2 bands |
| Input Selector | 4-channel stereo input selector |
| Input Gain Control | Built-in |
| Main Volume Control | Built-in |
| Loudness Function | Built-in |
| Fader Volume Control | 5-channel |
| Ground Isolation | Built-in ground-isolation amplifier inputs |
| Switching Noise Reduction | Supported for input gain, mute, main volume, fader volume, bass, treble, and loudness |
| Mute Control | Supported by the advanced switch circuit |
| Bass Control | Built-in |
| Treble Control | Built-in |
| 封裝 | 20-pin SSOP |
| 安裝類型 | Surface mount |
BD37515FS-E2 20-pin ssop 腳位配置指南
BD37515FS-E2（20-pin ssop 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： BD37515FS-E2.
請參閱 資料表 以查看完整腳位配置。
典型應用
BD37515FS-E2 適用於 6 應用s: Automotive Head Unit Audio Control, Portable Media Player Input Interface, Two-Band Tone Equalization, Multi-Zone Vehicle Audio Distribution, Loudness-Enhanced Listening Mode, External Stereo Source Switching.
Automotive Head Unit Audio Control
The BD37515FS-E2 fits an automotive head-unit signal path where multiple stereo inputs must be selected and adjusted before delivery to power amplifiers. Its 4-channel stereo input selector centralizes source routing, while input-gain control, main volume, mute, loudness, and five-channel fader functions provide the core level-control architecture. The I2C interface allows the head-unit controller to manage these functions through registers, reducing direct host wiring. Its 7 V to 9.5 V operating range also fits conventional automotive audio-system supply conditions.
Portable Media Player Input Interface
The BD37515FS-E2 can provide the input-conditioning and volume-control stage for a portable-media source connected to an in-vehicle audio system. Its built-in input-gain controller is specifically intended to reduce switching noise associated with portable-audio volume changes, while the ground-isolation amplifier inputs support external stereo-source connections. The design must preserve the correct signal amplitude and grounding relationship across the source interface. I2C control allows software to coordinate source selection, mute, and gain with the rest of the vehicle interface.
Two-Band Tone Equalization
The BD37515FS-E2 suits head units and automotive sound controllers requiring programmable bass and treble adjustment without separate analog tone-control networks. Its built-in two-band equalizer works alongside main-volume, loudness, mute, and input-gain functions, allowing a host controller to coordinate tonal changes with source changes and level transitions. The advanced switch circuit is designed to reduce switching noise associated with bass and treble adjustments. Component values and permitted control ranges should be selected using the manufacturer’s reference circuit and register information.
Multi-Zone Vehicle Audio Distribution
The BD37515FS-E2 can serve as the central sound-processing element in a multi-zone vehicle audio architecture because its fader-volume section supports five channels of level control. This is useful when front-seat, rear-seat, or other zones require coordinated attenuation from a common source. Main-volume and input-gain functions establish the upstream level, while fader control manages downstream distribution. Designers should verify signal levels, grounding, and routing in the manufacturer application circuit before scaling the design to additional powered outputs.
Loudness-Enhanced Listening Mode
The BD37515FS-E2 supports an automotive listening mode in which loudness processing is managed alongside bass, treble, mute, and volume functions. Loudness compensation can make low-level playback more perceptually balanced than a conventional fixed tone curve, particularly in a vehicle where background noise and cabin acoustics affect the listening environment. The IC allows the host controller to coordinate this processing through I2C. The manufacturer application guidance should determine how loudness and equalizer settings are combined for each speaker network.
External Stereo Source Switching
The 4-channel stereo input selector in BD37515FS-E2 supports centralized switching among multiple external stereo sources in an automotive audio controller. Source selection can be coordinated with input gain and mute so that transitions avoid unwanted noise or excessive level changes. The built-in ground-isolation amplifier inputs help separate external source signals from noisy vehicle grounds when the circuit is implemented according to the manufacturer reference design. PCB routing should keep these inputs short and away from switching-current paths to preserve signal integrity.
工程參考資料，適用於 BD37515FS-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 |
|---|---|
| Product Type | Automotive audio sound processor |
| Brand | ROHM Semiconductor |
| Package | 20-pin SSOP |
| Operating Voltage Range | 7 V to 9.5 V |
| Control Interface | I2C bus |
| Equalizer Bands | 2 bands |
| Input Selector | 4-channel stereo input selector |
| Fader Volume Control | 5-channel |
| Ground Isolation | Built-in ground-isolation amplifier inputs |
| Lifecycle Status | Not recommended for new designs |
主要差異化特點
- Combines multiple sound-control stages in one IC (對比Generic discrete analog audio-control implementation)
- Reduces control-related switching noise (對比Conventional mechanical or standalone analog controls)
- Supports centralized source and level management (對比Separate source switch and volume-control circuits)
設計說明
Place the input, output, bypass, and compensation components according to the manufacturer application circuit, with short return paths and minimal loop area around the audio pins. Keep the 20-pin SSOP footprint free of unintended solder bridges and verify pin assignments against the datasheet pin-description table before layout release. Because no complete numerical pin list is published here, use the manufacturer document as the controlling PCB-net authority.
Route the external stereo inputs and ground-isolated amplifier connections away from digital clock, I2C, and power-conversion currents. These paths carry low-level audio signals, so shared copper or long parallel runs with switching nodes can increase noise coupling. Use a continuous ground reference, keep return currents close to their associated signals, and follow the datasheet’s recommended grounding topology for the selected source configuration.
Do not treat the BD37515FS family name and the -E2 ordering suffix as evidence of electrical interchangeability without checking the orderable-device table. Also do not substitute a generic audio processor solely because it offers bass, treble, or volume controls. Verify the complete pin map, supply limits, register behavior, reset requirements, gain range, and fader architecture; otherwise a functional match may still require PCB and firmware changes.
合規資訊
The manufacturer identifies BD37515FS as a car-audio sound processor and marks it as not recommended for new designs. Specific RoHS, REACH, AEC-Q100, lead-free, halogen-free, and conflict-minerals declarations are not established by the available product summaries.
