BD3401KS2 - 2-Channel Audio Signal Processor | ROHM
Référence : BD3401KS2 ✓ ActifBD3401KS2 Présentation
An audio signal processor is an application-specific analog integrated circuit that conditions, controls, and routes audio signals. In the broader semiconductor hierarchy, it is an audio amplifier IC within integrated circuits and signal-processing semiconductors. Unlike a general-purpose operational amplifier, this device combines multiple functions associated with tape recording and playback, reducing the number of separate ICs required in a cassette-oriented signal chain while preserving a defined pin and function architecture.
The verified device information identifies the BD3401KS2 as an audio audio-signal processor with 2 channels and a surface-mount 64-LQFP package. Its microphone input is associated with pins 59 and 60, while the output is associated with pins 32 and 33 under the stated ALC-off condition. The manufacturer data also identifies maximum output voltage and gain specifications for the processing sections, including up to 2.5 Vrms maximum microphone output and distinct output-gain ranges for the two output paths.
Typical engineering uses include cassette and tape-deck playback channels, tape recording paths, microphone preamplification, stereo audio processing, and compact consumer-audio equipment. The single-supply architecture and integrated preamplifier make the IC relevant to designs where analog audio conditioning is required without deploying a collection of separate amplifiers and control devices. Exact input impedance, noise, frequency response, control-voltage ranges, and absolute maximum ratings must be confirmed against the manufacturer datasheet before layout or production use.
In a practical design, the analog signal path should be laid out with short, shielded routes for microphone and tape inputs, while supply and ground connections should use low-impedance planes. Decoupling capacitors should be placed directly beside the relevant supply pins, and output routing should avoid proximity to digital control traces. Because the part is associated with tape recording and playback, component tolerances and noise behavior can materially affect hiss, gain consistency, and channel balance.
This product summary combines the verified package, channel, supply, function, pin-fragment, and performance data with application-focused engineering guidance. It also clearly separates verified facts from parameters that still require confirmation from the full ROHM datasheet, reducing the risk of basing a new PCB or production BOM on incomplete web excerpts.
Alternatives de remplacement direct pour BD3401KS2 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec BD3401KS2 (même facteur de forme et même empreinte) — différant par Package, Product Type.
BD3402KS2
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →BD3401KS2 Valeurs maximales et caractéristiques électriques
| Product Type | Single Power Supply Sound Processor |
| Audio Channel Count | 2 channels |
| Integrated Functions | Built-in preamplifier for tape recording and playback |
| Supply Voltage Range | 8 V to 9.5 V |
| Boîtier | 64-SQFP (12 x 12 mm) |
| Package Type | 64-LQFP |
| Type de montage | Surface mount |
| Manufacturer | ROHM Semiconductor |
| Datasheet Revision | Rev. A, 2010.10 |
| Maximum Microphone Output Voltage | 2.5 Vrms at THD = 1%, BW = 400 Hz to 30 kHz, MIC = ON |
| Minimum Microphone Output Voltage | 2.0 Vrms at THD = 1%, BW = 400 Hz to 30 kHz, MIC = ON |
| Microphone Total Harmonic Distortion | 0.01% typical, 0.1% maximum, BW = 400 Hz to 30 kHz, MIC = ON |
| Output Path 1 Voltage Gain | -8 dB to -4 dB, output at pin 55 |
| Output Path 2 Voltage Gain | -2 dB to 2 dB |
| ALC-Off Microphone Input Pins | 59 and 60 |
| ALC-Off Output Pins | 32 and 33 |
Guide de configuration des broches du BD3401KS2 64-lqfp
Configuration des broches du BD3401KS2 (boîtier 64-lqfp). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour BD3401KS2.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
BD3401KS2 convient pour 6 applications: Analog Tape Playback, Two-Channel Tape Recording, Microphone Preamplifier, Stereo Audio Signal Conditioning, Compact Consumer Audio Equipment, Analog-to-Digital Audio Front End.
Analog Tape Playback
The BD3401KS2 is suited to analog tape-playback signal paths because it is a 2-channel sound processor with a built-in preamplifier expressly identified for tape recording and playback. It can be evaluated as the central conditioning device for left and right playback channels rather than as a standalone low-noise op amp. The verified 8 V to 9.5 V supply range and 64-SQFP footprint support integration into a compact analog deck. Before committing to the PCB, verify head impedance, playback gain, level-control implementation, and the complete pin map in the ROHM datasheet.
Recommandé
Two-Channel Tape Recording
The BD3401KS2's verified 2-channel organization and built-in tape preamplifier make it directly relevant to dual-channel cassette recording electronics. Its microphone section is specified up to 2.5 Vrms output at 1% THD over 400 Hz to 30 kHz, providing concrete criteria for recording-path evaluation. The device should be assessed with the intended recording head, bias network, and level-control circuitry, because those external details are not included in the supplied excerpts and can materially affect headroom and distortion.
Recommandé
Microphone Preamplifier
The BD3401KS2 includes a microphone preamplifier and supports an ALC-off operating condition in which inputs appear at pins 59 and 60. Its verified microphone THD is 0.01% typical and 0.1% maximum from 400 Hz to 30 kHz, while maximum output reaches 2.5 Vrms at the stated 1% THD test point. These figures provide a baseline for microphone-head and electret-circuit evaluation. The source impedance, bias requirements, input noise, and ALC behavior must be taken from the full datasheet before selecting external components.
Recommandé
Stereo Audio Signal Conditioning
The BD3401KS2 can serve as the central stereo conditioning element in an analog sound system because the verified data identifies two audio channels and separate gain specifications for two output paths. The first output path is listed at -8 dB to -4 dB gain with output at pin 55, while the second spans -2 dB to 2 dB. That asymmetry may reflect distinct recording and playback functions rather than two identical output stages, so designers should confirm signal flow in the complete application circuit instead of assuming balanced stereo channels.
Recommandé
Compact Consumer Audio Equipment
The 12 x 12 mm, 64-SQFP implementation of the BD3401KS2 is appropriate for compact analog-audio equipment where multiple sound-processing functions must be consolidated. Its single 8 V to 9.5 V supply reduces the number of rail families required compared with a dual-supply design, although exact bypass and sequencing requirements remain datasheet-dependent. The product is especially relevant to legacy-format tape products being adapted into compact consumer equipment; thermal performance and electromagnetic compatibility should be checked with the complete manufacturer reference circuit.
Recommandé
Analog-to-Digital Audio Front End
The BD3401KS2 can condition two analog channels before they enter a digital audio converter, using its integrated preamplifier and tape-oriented processing functions to establish a controlled analog level. The verified output arrangement includes pins 32 and 33 under the ALC-off condition and an additional output reference at pin 55, allowing channel-routing options to be investigated. However, the provided data does not establish output impedance, frequency limits for every path, or channel-matching tolerances. These parameters must be confirmed before pairing the device with an ADC or codec.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour BD3401KS2 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | BD3402KS2 |
|---|---|---|
| Brand | ROHM Semiconductor | ROHM Semiconductor |
| Package | 64-SQFP (12 x 12 mm) | 64-SQFP (12 x 12 mm) |
| Product Family | Single Power Supply Sound Processor | Single Power Supply Sound Processor |
Principaux différenciateurs
- Two-channel tape-oriented processing in one IC (vs BD3402KS2)
- Documented microphone performance (vs BD3402KS2)
- Defined ALC-off signal locations (vs BD3402KS2)
Notes de conception
Use the manufacturer's 64-pin SQFP land pattern and verify the complete pin table before routing. The verified excerpts place the ALC-off microphone inputs at pins 59 and 60 and the associated outputs at pins 32 and 33, while one output-gain test references pin 55. These fragments are insufficient to assign every pin, so obtain the Rev. A datasheet and perform a pin-by-pin schematic-to-layout audit before fabrication.
Keep the microphone and tape-input routes short and isolated from switching-node and digital-control traces. The verified specification of 0.01% typical microphone THD from 400 Hz to 30 kHz is meaningful only under defined source impedance, bias, gain, and test conditions. Preserve a quiet ground reference, use stable input grounding, and avoid routing sensitive inputs beside high-current output paths to minimize parasitic coupling and channel-to-channel imbalance.
Do not infer pin compatibility solely from the shared 64-LQFP package and BD3401KS2/BD3402KS2 family grouping. The supplied excerpts do not expose all functional pins or control-voltage tables for the BD3402KS2. Before using it as a replacement, compare power pins, ground pins, microphone inputs, outputs, bias and ALC controls, timing signals, and absolute maximum ratings against the original circuit requirements.
Informations de conformité
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because this is an analog audio IC rather than an automotive-qualified device; no automotive qualification claim was provided.
