BD3489FS-E2 - ROHM Sound Processor / Equalizer IC | 32-Pin SSOP-A
N.º da peça: BD3489FS-E2 ✓ AtivoBD3489FS-E2 Visão geral
An audio equalizer is a passive or active frequency-selective circuit that applies a defined gain to each of several frequency bands. Inside a car head unit or mini system, the equalizer block sits between the source selector and the power amplifier, so the sound processor IC defines the tonal character of the output stage. Its immediate hierarchy is audio signal-processing IC -> sound processor -> equalizer/tone control -> audio subsystem -> consumer and automotive audio equipment.
Key packaging and ordering features of the BD3489FS-E2 include the -E2 suffix denoting the RoHS-compliant, embossed carrier-tape-and-reel delivery form, a 32-pin SSOP-A body that suits high-density audio boards, and a single silicon monolithic construction that keeps the external BOM small. Because the equalizer and processor functions are integrated on one die, the board designer can replace discrete filter networks and switching logic with a single IC, reducing assembly cost and improving channel matching between left and right paths.
The BD3489FS family is designed for bidirectional stereo processing, with separate control inputs for each channel so that gain settings, tone, and volume can be adjusted independently. Because the device is intended for audio signal paths rather than logic-level logic, its internal stages are optimized for low-noise audio bandwidth operation with a mono/stereo signal flow appropriate for potentiometer or switch control from a front-panel interface.
Typical uses include car audio head units, compact stereo systems, radio and cassette-era audio decks, home mini-system amplifiers, and portable or docked audio products where an adjustable tone control is expected in the signal chain. The 32-pin SSOP-A footprint is also attractive for designs that need many control lines but must fit a small PCB.
When designing around this part, confirm the exact pin assignment and typical application circuit from the ROHM datasheet before layout, because the control pins of sound processor ICs are frequently routed directly to front-panel switches and dual-gang potentiometers. Reserve filtering and decoupling close to the supply pins, and treat the equalizer band centers and Q factor as fixed by the internal topology rather than user-adjustable.
This page adds engineering context beyond the manufacturer datasheet: a structured specification list with explicit data gaps, a same-footprint alternative comparison, six application scenarios with companion component recommendations, and layout and signal-integrity design notes that reduce bring-up risk on audio boards.
Alternativas drop-in para BD3489FS-E2 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
BD3489FS
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
BD3489FS-E2 Classificações máximas e características elétricas
| Device Type | Sound processor / equalizer IC |
| Manufacturer | ROHM Semiconductor |
| Construction | Silicon monolithic integrated circuit |
| Encapsulamento | SSOP-32 (32-pin SSOP-A) |
| Contagem de pinos | 32 pins |
| Tipo de montagem | Surface mount |
| Delivery Form | Tape & reel, embossed (-E2 suffix) |
| Categoria | Audio special-purpose IC |
| Função | Audio equalizer and sound processing |
| Channel Handling | Stereo / dual channel processing |
| Status RoHS | Compliant (-E2 suffix, RoHS status listed as N for non-restricted) |
| Datasheet Document Length | 6 pages |
| Datasheet File Size | 334 KB |
| Surface Mount | Yes |
Guia de Configuração de Pinos do BD3489FS-E2 ssop-32 (32-pin ssop-a)
Configuração de pinos para BD3489FS-E2 (pacote ssop-32 (32-pin ssop-a)). Este CI digital inclui GPIO, interfaces de comunicação (UART, SPI, I2C) e pinos de alimentação. Consulte o datasheet do fabricante para funções alternativas dos pinos e opções de configuração. Essencial para projeto de sistemas embarcados e layout de PCB.
Nenhum dado detalhado de pinagem disponível para BD3489FS-E2.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
BD3489FS-E2 é adequado para 6 aplicaçãos: Car Audio Head Unit Tone Control, Compact Home Mini-System Amplifier, Portable and Docked Audio Product, Radio and Tuner Audio Path, Multi-Gain-Stage Audio Interface, Loudspeaker and Soundbar Tone Shaping.
Car Audio Head Unit Tone Control
The BD3489FS-E2 fits the tone and volume control block of a car audio head unit, where the front panel exposes rotary knobs and push buttons that must alter the left and right channels together while preserving channel balance. Integrating the equalizer and sound-processor functions on one 32-pin SSOP-A device removes the discrete filter and switching networks normally required, cutting assembly steps and keeping the left and right gain curves matched because both channels share the same die. The 32-pin body also gives adequate pin count for multiple switched tone bands plus balance and volume inputs wired directly to dual-gang potentiometers. Confirm the operating temperature range and automotive qualification status in the manufacturer datasheet before production release.
Recomendado
Compact Home Mini-System Amplifier
In a home mini system or stereo deck, the BD3489FS-E2 provides the adjustable bass and treble character that users expect from a physical equalizer control, ahead of the power amplifier stage. Because the equalizer bands are fixed inside the IC, the sound character is repeatable across production units, which is a benefit over discrete passive filter networks whose corner frequencies drift with component tolerance. The 32-pin SSOP-A package is compact enough for a small amplifier board while still exposing enough pins for band-select switches, a balance control, and a muting or loudness function. A digital source such as a DAC can feed the processor input directly, and the processed stereo signal then drives the amplifier.
Recomendado
Portable and Docked Audio Product
Battery-powered portable speakers and docked audio products benefit from the BD3489FS-E2 because it adds user-adjustable tone and balance without needing a digital signal processor or a costly DSP. The equalizer runs as a passive-gain function ahead of the amplifier, so power consumption is low and latency is effectively zero, which suits a product where the DSP would also add boot time and code. In a design where a Bluetooth or digital audio module feeds the board, the BD3489FS-E2 provides the final analog tonal shaping close to the speaker amplifier, keeping the digital section and the analog section cleanly separated. Use a shielded layout and decouple the supply pins close to the device to keep the audio path free of switching noise.
Recomendado
Radio and Tuner Audio Path
In radio and tuner products the BD3489FS-E2 is typically used to correct the tonal imbalance that different broadcast sources introduce, giving the listener a consistent bass and treble presentation across AM, FM, and auxiliary inputs. Placing the equalizer after the source selector and before the volume/output amplifier allows one set of tone controls to serve every input, which is a simpler architecture than switching filter banks per source. The integrated approach also reduces component count on a board where analog space is tight, and the 32-pin SSOP-A footprint is widely supported by assembly tooling. Confirm the equalizer band center frequencies and the maximum input signal level in the manufacturer datasheet so that strong local stations do not overdrive the processor input.
Recomendado
Multi-Gain-Stage Audio Interface
The BD3489FS-E2 works as an intermediate gain-shaping stage in professional and semi-professional audio interfaces that need a fixed tone contour between the converter and the output driver. Fixing the equalizer response in hardware gives a repeatable reference level for downstream metering and headroom calculations, and lets the interface keep the digital mixer path simplified. Because the device is a bipolar-style analog signal processor, it also keeps the noise floor contribution small relative to the converter it follows. Place the stage in the signal chain ahead of a balanced output driver, and use the pin description table in the manufacturer datasheet to route the ground and supply pins in a way that avoids coupling from the switching supply section of the board.
Recomendado
Loudspeaker and Soundbar Tone Shaping
In soundbar and small loudspeaker products, the BD3489FS-E2 adds a fixed tonal correction that compensates for the acoustic response of a compact enclosure, giving a more balanced bass and treble from a driver set that cannot be tuned mechanically. The integrated equalizer reduces the number of analog filter stages required in a space-constrained enclosure, and the 32-pin SSOP-A package fits easily alongside the amplifier. Fixed known band shapes also make the design repeatable across production lots, which matters for a product where the acoustic tuning is validated once and then replicated. Because the correction is applied in analog ahead of the amplifier, keep the input signal level below the processor's recommended maximum to avoid distortion, and verify the final in-box response with measurement after assembly.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para BD3489FS-E2 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | BD3489FS |
|---|---|---|
| Package | SSOP-32 (32-pin SSOP-A) | SSOP-32 (32-pin SSOP-A) - same |
| Brand | ROHM Semiconductor | ROHM Semiconductor - same |
| Device Type | Sound processor / equalizer IC | Sound processor / equalizer IC |
| Pin Count | 32 pins | 32 pins |
| Construction | Silicon monolithic integrated circuit | Silicon monolithic integrated circuit |
| Ordering Code | BD3489FS-E2 (RoHS-compliant, embossed tape and reel) | BD3489FS (base ordering code, different packing/compliance suffix) |
| Delivery Form | Tape & Reel | Depends on ordering suffix selected |
Principais diferenciais
- Integrated equalizer and sound-processor functions on one die (vs Discrete op-amp filter networks)
- Fixed, repeatable equalizer band response (vs Discrete passive filter networks)
- Direct front-panel control interface in 32 pins (vs Simple single-band tone control)
Notas de projeto
The control pins of this sound processor are meant to be driven from front-panel switches and dual-gang potentiometers, so route them as low-impedance analog control traces away from the switching supply section and away from the power amplifier output stage. Keep the analog audio input and output traces short and pair them with a continuous ground reference; a split ground plane under the audio path is a common source of hum and channel imbalance in equalizer boards. Provide the manufacturer-recommended bypass capacitance directly at the supply pins, with a short ground return, to keep supply ripple out of the tonal band the IC is shaping.
The equalizer bands are fixed by the internal topology, so the usable input level into the processor is bounded. Before committing the front end, estimate the maximum signal level reaching the input when the source is at full scale and the user has maximum tone boost applied, and confirm it against the recommended input range in the manufacturer datasheet. Overdriving the processor input is the most common cause of distortion that appears only with certain settings. Also confirm that potentiometer wiper values and switch positions map to the control pins in the order shown by the pin description table.
Do not substitute the base ordering code BD3489FS for BD3489FS-E2 without checking your compliance requirements. The -E2 suffix identifies the RoHS-compliant embossed carrier-tape-and-reel form, and incoming-inspection scripts or customer specifications often key on that suffix. A second common mistake is assuming a same-package equalizer IC from another vendor is interchangeable: control-pin assignment, band center frequencies, and gain structure differ even when the package body matches, so verify the pin description table and typical application circuit before any cross-brand substitution.
The 32-pin SSOP-A body has a fine lead pitch, so plan the footprint on a two-layer board with adequate solder mask dam and via-in-pad-free land patterns to avoid bridging during reflow. Reserve a keep-out around the device for the surrounding analog support network and for the potentiometer or switch wiring, since the control lines typically fan out to the front panel. If the board also carries a switching regulator, place the converter and its inductor at the opposite edge from the audio path and maintain a solid, uninterrupted ground region under and around the processor.
Informações de conformidade
The -E2 ordering code is the RoHS-compliant delivery form of the BD3489FS, and the component record lists the RoHS status as non-restricted. No AEC-Q100 automotive qualification is indicated for this ordering code; confirm automotive temperature and qualification requirements directly with the manufacturer before use in vehicle equipment.
