BD37534FV-E2 3-Band Audio Equalizer | ROHM Semiconductor
MPN: BD37534FV-E2 ✓ ActiveBD37534FV-E2 Overview
A sound processor is an audio signal-conditioning integrated circuit that adjusts amplitude and frequency-domain characteristics between audio sources and an amplifier or speaker system. The BD37534FV family belongs to the broader analog audio-processing category, combining source switching, volume management, tone shaping, loudness compensation, and subwoofer filtering in one integrated circuit. Its integrated three-band equalizer allows bass, middle, and treble adjustment without external equalizer components, helping reduce board size in compact audio systems.
The equalizer divides the audio signal into bass, middle, and treble regions for tone adjustment. The manufacturer identifies the BD37534FV family as supporting common control software, which can simplify system integration when the same software ecosystem is used across related products. The built-in subwoofer path includes low-pass filtering and mixing functionality, making the device relevant to automotive head units, in-dash audio systems, compact stereo systems, and other multi-zone audio products.
The BD37534FV-E2 uses an I2C control interface and is identified as an automotive-grade, two-channel audio tone processor. Its operating-temperature range is -40°C to 85°C, while its supply-voltage range is 7 V to 9.5 V. The 28-SSOP-B package is a surface-mount format measuring 0.220 inches, or 5.60 mm, in width according to the distributor specification record. The part is presented by the manufacturer as a car-audio sound processor rather than as a power amplifier, so its signal-processing function should not be confused with output-stage power capability.
When designing around this device, the power supply, I2C control lines, analog input routing, and output connections should be planned together. Decoupling should follow the connection recommendations in the manufacturer datasheet, and the analog signal path should be kept away from noisy switching or high-current power circuitry. The equalizer and volume functions are especially useful where a compact panel requires integrated bass, middle, treble, loudness, and subwoofer control without a separate network of external active filters.
This page combines the manufacturer product description, distributor specifications, package information, operating limits, and application-oriented guidance. It also identifies the verified drop-in alternative that can be evaluated without changing the PCB footprint and highlights which detailed electrical and pin-level characteristics still require confirmation from the manufacturer datasheet before a production release.
Drop-in alternatives for BD37534FV-E2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
BD37534FV
✅ Drop-In📋 Reference alternative (not in catalog)
BD37534FV-E2 Specifications
| Product Type | Sound processor with built-in three-band equalizer |
| Number of Channels | 2 channels |
| Equalizer Bands | 3 bands: bass, middle, and treble |
| Control Interface | I2C |
| Supply Voltage Range | 7 V to 9.5 V |
| Operating Temperature Range | -40°C to 85°C |
| Package | 28-SSOP-B, 5.60 mm width |
| Mounting Type | Surface mount |
| Input Selector | Stereo input selector supporting single-ended and ground-isolation input |
| Input Gain Control | Supported |
| Main Volume Control | Supported |
| Loudness Control | Supported |
| Fader Volume | 5-channel fader volume |
| Subwoofer Low-Pass Filter | Supported |
| Mixing Input | Supported |
| External Equalizer Components | Not required for parametric equalizer adjustment |
| Typical Equalizer Frequency Range | 0 MHz to 0.4 MHz |
| Grade | Automotive |
| Common Control Software Support | Supported within the BD37534FV series |
BD37534FV-E2 28-ssop-b, 5.60 mm width Pin Configuration Guide
Pin configuration for BD37534FV-E2 (28-ssop-b, 5.60 mm width package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for BD37534FV-E2.
Refer to the datasheet for full pin configuration.
Typical Applications
BD37534FV-E2 is suitable for 6 applications: Automotive Head Unit Audio Processing, In-Dash Multi-Zone Stereo System, Compact Subwoofer and Stereo Mixing System, Automotive Navigation Audio Interface, Bluetooth Media Player Front End, Low-Voltage Automotive Audio Control Module.
Automotive Head Unit Audio Processing
The BD37534FV-E2 fits an automotive head unit that needs centralized control of stereo tone, loudness, source level, and subwoofer output. Its two-channel format supports left and right audio paths, while the built-in bass, middle, and treble equalizer permits user-adjustable tone settings without a large passive filter network. The I2C interface lets the head-unit controller manage audio functions digitally. With a 7 V to 9.5 V supply range and an operating range of -40°C to 85°C, the processor is aligned with compact vehicle audio systems, subject to final automotive qualification review.
Recommended
In-Dash Multi-Zone Stereo System
BD37534FV-E2 can serve as the analog tone and routing processor in an in-dash stereo designed for front, rear, and subwoofer zones. Its five-channel fader-volume function supports multi-channel level management, while the input selector switches stereo sources and provides input-gain control before the main volume stage. The integrated loudness function supports perceived-volume compensation at lower listening levels. Designers should use the manufacturer pin table when routing each source and should keep sensitive analog traces away from switching regulators and high-current amplifier output circuitry.
Recommended
Compact Subwoofer and Stereo Mixing System
The BD37534FV-E2 is useful in compact stereo products that need to derive a filtered subwoofer channel while retaining full-range left and right outputs. Its dedicated low-pass filter for the subwoofer path, mixing input, and three-band equalizer simplify the analog signal architecture around the amplifier stage. The processor controls signal level and spectral balance but does not replace the power amplifier or crossover loudspeakers. PCB implementation should preserve short analog paths, provide the required supply decoupling, and keep output routing away from switching nodes.
Recommended
Automotive Navigation Audio Interface
A navigation head unit can use the BD37534FV-E2 to condition analog navigation prompts, radio audio, and media-player signals before amplification. The stereo input selector switches between available sources, input-gain control establishes consistent levels, and main volume plus loudness provide user-facing level management. I2C control permits the navigation system to adjust settings as operating modes change. Because the audio paths carry low-level signals, return paths and input grounding should be planned carefully, and the manufacturer reference circuit should be used as the basis for component selection and board layout.
Recommended
Bluetooth Media Player Front End
BD37534FV-E2 can provide the final analog tone-control stage in a compact automotive Bluetooth media player. After a Bluetooth receiver produces left and right analog audio, the processor provides source gain, bass-middle-treble adjustment, loudness, volume control, and optional subwoofer mixing. This arrangement keeps user-interface tone presets and volume behavior under the control of the host microcontroller through I2C. The external amplifier still determines available output power, while the processor determines the signal level and tonal character presented to it.
Recommended
Low-Voltage Automotive Audio Control Module
BD37534FV-E2 is appropriate for a dedicated low-voltage audio-control module that handles analog routing and equalization within a larger vehicle electronics architecture. Its 7 V to 9.5 V operating range suits systems powered from an automotive low-voltage rail, and the I2C interface supports centralized configuration and live control. The three-band equalizer can implement several preset listening profiles without external active-filter boards. System designers should verify startup behavior, control defaults, and signal offsets against the manufacturer datasheet, especially when multiple modules share an I2C bus.
Recommended
Recommended Products Summary
Engineering reference data for BD37534FV-E2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BD37534FV |
|---|---|---|
| Brand | ROHM Semiconductor | ROHM Semiconductor |
| Package | 28-SSOP-B, 5.60 mm width | 28-SSOP-B |
| Product Type | Audio tone processor with built-in three-band equalizer | Sound processor with built-in three-band equalizer |
| Equalizer Bands | 3 bands: bass, middle, and treble | 3 bands |
| Control Interface | I2C | I2C |
| Input Selector | Single-ended and ground-isolation input switching | Single-ended and ground-isolation input switching |
| Subwoofer Function | Low-pass filter and mixing input | Low-pass filter and mixing input |
| Mounting Type | Surface mount | Surface mount |
| Ordering Suffix | -E2 | Base family designation without -E2 |
Key Differentiators
- Integrated three-band tone control (vs BD37534FV)
- Automotive-oriented analog signal-processing feature set (vs BD37534FV)
- Integrated subwoofer and fader functions (vs BD37534FV)
Design Notes
Route the BD37534FV-E2 analog inputs and outputs as short, continuous paths, and place the device away from switching-regulator power loops and high-current amplifier traces. The processor handles low-level audio signals, so inductive and capacitive coupling can affect channel-to-channel balance and the effective EQ response. Use a continuous ground reference and follow the manufacturer reference layout when determining the positions of input, output, bypass, and control components.
Design the supply path for the documented 7 V to 9.5 V operating range and implement the manufacturer's bypass recommendations directly at the device pins. Keep the analog supply connection separate from noisy return currents where the board stackup permits. A stable, low-impedance supply reference is especially important because gain, volume, loudness, and equalizer settings act on the audio signal before it reaches the power amplifier.
Do not treat the BD37534FV-E2 as a power amplifier; its verified functions are input selection, gain, volume, loudness, fader, equalization, filtering, and mixing. Confirm the signal amplitude expected at each input and output in the datasheet to avoid clipping or excessive loading. Also verify the I2C address, register map, default values, and control timing against the actual board firmware before production testing.
Validate the complete audio chain with representative source levels, including quiet radio passages, maximum digital-audio amplitude, and subwoofer mixing conditions. A tone processor can make overload, clipping, or channel imbalance less obvious during functional testing. Use the manufacturer reference circuit, check the equalizer and loudness settings at operating temperature, and perform both left-right and full-band frequency-response tests before releasing the PCB and firmware.
Compliance Information
The distributor record identifies an automotive grade, but it does not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance must be confirmed for the exact ordering suffix and shipment configuration.
