BD3812F-E2 - 2-Channel Audio Volume Controller | ROHM
N.º de pieza: BD3812F-E2 ✓ ActivoBD3812F-E2 Descripción general
An electronic volume controller is an audio signal processor that adjusts the level of one or more audio channels through a control interface rather than a mechanical potentiometer. In the product hierarchy, it belongs to the broader class of audio special-purpose ICs, which sit between analog signal-generation blocks and power amplifiers. The BD3812F-E2 is designed to preserve audio signal quality while providing repeatable, software-controlled attenuation for multi-channel audio systems.
The BD3812F-E2 supports independent control of two channels over a 103 dB attenuation range. Its mute function changes the level in 1 dB steps, making it suitable for product designs that need fine attenuation control, channel balancing, or user-selected volume settings. When combined with any of the BD3811K1, BD3813KS, BD3814FV, or BD3815KS family members, as specified by ROHM, the common bus supports up to eight channels. The common-bus architecture can also control as many as four chips at the same time.
The maximum output voltage is 4.2 Vrms under the stated conditions of VCC = 7 V, VEE = -7 V, and RL = 10 kOhm. This output capability, combined with a residual-noise specification of 1.2 uVrms, supports low-noise audio signal paths. The two-line serial control reduces the number of control connections required compared with a parallel volume-control arrangement, which can also simplify PCB routing and microcontroller interface design.
Typical uses include television and monitor audio channels, home-audio systems, active speakers, audio mixers, and multi-zone entertainment equipment. The device is particularly useful where independent left and right attenuation, common-bus expansion, mute control, or precise software-defined volume adjustment is required. Because its operating supply range is specified as 5 V to 7.3 V, the surrounding circuit must provide compatible positive and negative analog rails where the application requires the stated 4.2 Vrms output capability.
Designers should preserve the datasheet-specified bypass and output-load conditions when evaluating signal integrity. The 10 kOhm load used for the stated maximum-output condition is relevant to downstream amplifier planning, and any external coupling or amplifier input must not load the output beyond the supported operating conditions. Decoupling should be placed close to the supply pins, and the common-bus wiring of multiple devices should be kept short to minimize coupling between channels.
This product data combines the verified ROHM feature description with distributor packaging information, practical multi-channel application guidance, and explicit data-gap markers. It distinguishes verified numeric performance from unreported specifications and does not infer a pin assignment, temperature range, or drop-in substitute that the supplied sources do not confirm.
Alternativas directas para BD3812F-E2 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
BA3812L
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
BD3812F-E2 Especificaciones
| Product Type | 2-channel electronic audio volume controller |
| Residual Noise | 1.2 uVrms |
| Dynamic Range | 131 dB under IHF-A weighting |
| Independent Channel Count | 2 channels |
| Attenuation Range | 0 dB to -103 dB |
| Mute Control Increment | 1 dB per step |
| Maximum Output Voltage | 4.2 Vrms at VCC = 7 V, VEE = -7 V, and RL = 10 kOhm |
| Maximum Combined Channel Count | 8 channels using specified BD3811K1, BD3813KS, BD3814FV, or BD3815KS family members |
| Maximum Simultaneously Controlled Chips | 4 chips on a common bus line |
| Control Interface | 2-line serial control |
| Supply Voltage Range | 5 V to 7.3 V |
| Positive Test Supply | 7 V for the stated 4.2 Vrms output condition |
| Negative Test Supply | -7 V for the stated 4.2 Vrms output condition |
| Output Load Condition | 10 kOhm |
| Encapsulado | 14-SOIC, 4.40 mm width |
| Tipo de montaje | Surface mount |
| Packaging | Tape and reel |
| Categoría | Audio special-purpose integrated circuit |
Guía de configuración de pines de BD3812F-E2 14-soic, 4.40 mm width
Configuración de pines para BD3812F-E2 (encapsulado 14-soic, 4.40 mm width). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para BD3812F-E2.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
BD3812F-E2 es adecuado para 6 aplicacións: Home-Theater Surround Audio, Television Audio Volume Control, Multi-Zone Audio Distribution, Active Speaker Crossover, Portable Audio Accessory, Audio Mixing Console Preamp.
Home-Theater Surround Audio
The BD3812F-E2 fits home-theater surround-audio paths because it provides independent attenuation for two channels over a 0 dB to -103 dB range, with mute changes in 1 dB steps. Its 1.2 uVrms residual noise and 131 dB IHF-A dynamic range help preserve low-level dialogue and quiet musical passages during attenuation. The part can also be combined with the BD3811K1, BD3813KS, BD3814FV, or BD3815KS devices identified by ROHM to expand a common-bus design to as many as eight channels. The downstream amplifier should operate within the stated 10 kOhm load condition when evaluating the 4.2 Vrms maximum output.
Recomendado
Television Audio Volume Control
The BD3812F-E2 is suitable for television and monitor audio channels requiring software-controlled level adjustment rather than a user-operated potentiometer. Two channels can be attenuated independently from 0 dB to -103 dB, and the 1 dB mute increments permit smooth channel balancing or mute transitions. Its two-line serial control reduces interface wiring compared with a parallel attenuator arrangement, while the 14-SOIC package supports compact surface-mount layouts. ROHM specifies a maximum output of 4.2 Vrms with VCC = 7 V, VEE = -7 V, and RL = 10 kOhm, which should be matched to the television amplifier and coupling network.
Recomendado
Multi-Zone Audio Distribution
The BD3812F-E2 can support multi-zone audio routing because it offers independent attenuation for two channels and shares a common control bus with compatible devices. ROHM states that as many as eight channels can be available when the part is combined with any of the BD3811K1, BD3813KS, BD3814FV, or BD3815KS family members, and up to four chips can be controlled simultaneously. The 0 dB to -103 dB range allows substantial level reduction between program sources or zones. A practical design should keep the common bus short, provide clean supply rails, and confirm that each downstream power amplifier accepts the selected signal level.
Recomendado
Active Speaker Crossover
The BD3812F-E2 can be placed in an active-speaker signal path to provide electronic level matching between source outputs and power-amplifier inputs. Independent 0 dB to -103 dB attenuation allows separate adjustment of two driver channels, while 1 dB mute steps make calibration and setup repeatable through the control system. The specified 1.2 uVrms residual noise and 131 dB IHF-A dynamic range are useful when maintaining quiet program material. Because maximum output reaches 4.2 Vrms under a 10 kOhm load and specified positive and negative rails, the amplifier input, coupling capacitors, and grounding topology must be validated for speaker crossover bandwidth and transient behavior.
Recomendado
Portable Audio Accessory
The BD3812F-E2 is appropriate for a compact audio accessory that requires precise digital attenuation between a source device and an analog amplifier. The two independent channels support stereo level adjustment, while the 1.2 uVrms residual noise helps minimize added hiss in headphone or line-level paths. Its two-line serial control can simplify connection to a small controller, and the 14-SOIC package provides a standard surface-mount footprint. Battery-powered implementations must account for the required 5 V to 7.3 V supply range and positive and negative rail arrangement, and should verify shutdown behavior and quiescent current directly from the manufacturer datasheet.
Recomendado
Audio Mixing Console Preamp
The BD3812F-E2 can serve as a digitally adjustable preamp element in a compact audio mixer or monitor controller. Two channels can be attenuated independently, and the 0 dB to -103 dB range provides broad control for source balancing and mute operation. The 1 dB mute increments are convenient when a controller needs repeatable software-selected attenuation, while the low 1.2 uVrms residual noise supports quiet program reproduction. The stated 4.2 Vrms maximum output applies at 7 V positive supply, -7 V negative supply, and 10 kOhm load, so a mixer requiring different headroom or impedance must be evaluated against the complete manufacturer electrical specification.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para BD3812F-E2 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | BA3812L |
|---|---|---|
| Product Type | 2-channel electronic audio volume controller | 2-channel electronic volume-control comparator |
| Brand | ROHM Semiconductor | ROHM Semiconductor |
| Package | 14-SOIC, 4.40 mm width | 14-SOIC candidate footprint; exact package verification required |
| Channel Count | 2 channels | 2 channels |
| Mounting Type | Surface mount | Surface-mount candidate; exact package verification required |
Diferenciadores clave
- Large attenuation range with fine mute resolution (frente a BA3812L)
- Verified low-noise audio performance (frente a BA3812L)
- Documented common-bus expansion capability (frente a BA3812L)
- Defined high-output operating condition (frente a BA3812L)
Notas de diseño
Keep the two-line serial-control route short and away from analog output and power-amplifier input paths. When several BD381x devices share the common bus, follow the manufacturer connection sequence and verify device addressing before PCB release. Place input, output, and bypass capacitors close to their associated pins, use a continuous ground reference where appropriate, and avoid routing the bus beneath switching-power or loudspeaker-amplifier output nodes. Because the supplied results do not expose a verified pin table, engineers should derive every net assignment from the official ROHM datasheet rather than from the 14-SOIC package drawing alone.
The stated maximum output of 4.2 Vrms applies at VCC = 7 V, VEE = -7 V, and RL = 10 kOhm. Do not assume the same swing is available with a smaller negative rail, a different load, or a supply outside the verified 5 V to 7.3 V range. Provide low-impedance supply paths and the bypass network specified by ROHM. Confirm the quiescent current, startup behavior, and absolute maximum ratings from the datasheet before selecting the analog supply topology, particularly for battery-powered designs where conversion efficiency and rail headroom can determine whether full output swing is achievable.
Treat the volume controller as a precision analog block even though its settings are controlled digitally. The verified residual-noise figure is 1.2 uVrms, with 131 dB dynamic range under IHF-A weighting, but system noise also depends on resistor matching, reference behavior, supply ripple, and downstream amplifier noise. Use symmetric signal paths where channel matching matters, maintain consistent grounding between the two channels, and avoid excessive loading beyond the 10 kOhm condition used for the stated 4.2 Vrms output. Validate mute-step transitions and channel-balance behavior in the complete amplifier circuit rather than relying on controller specifications alone.
Información de cumplimiento
A cross-reference snippet describes the part as RoHS compliant, but the supplied verified manufacturer and distributor excerpts do not contain the underlying compliance declaration. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status are therefore reported as unknown. AEC-Q100 qualification is not indicated for this audio processor.
