Analog Devices MAX4397DACTM+: Малошумящий звуковой операционный усилитель (8-контактный ACTM)

Overview of MAX4397DACTM+ Low-Noise Audio Operational Amplifier

The MAX4397DACTM+ is a premium low-noise audio operational amplifier (op-amp) from Analog Devices Inc. (ADI), engineered for precision audio signal amplification in professional and high-end consumer systems. Designed to boost weak audio signals??from condenser microphones, turntable phono stages, or medical sensors??while adding minimal noise, it preserves the integrity of original sound. Its integration of rail-to-rail output and wide voltage compatibility eliminates external level-shifting components, simplifying designs and reducing bill-of-materials (BOM) costs. For trusted sourcing and consistent supply, visit Производитель ИС.

Technical Parameters of MAX4397DACTM+ Audio Op-Amp

Core Performance & Audio Specifications

Параметр	Значение
Input Noise Density	1.2nV/??Hz (at 1kHz, A-weighted)
Gain Bandwidth Product (GBW)	12MHz (typical)
Скорость нарастания	9V/??s (typical)
Тип выхода	Rail-to-rail (output swings to within 10mV of supply rails)
Основные характеристики	Low-noise input stage, unity-gain stable, short-circuit protection, thermal shutdown

Детали питания и упаковки

Параметр	Значение
Диапазон рабочего напряжения	2.7V ?C 5.5V (single supply); ??1.35V to ??2.75V (dual supply)
Quiescent Current (per channel)	2.9mA (typical, 5V single supply)
Shutdown Current	0.1??A (maximum)
Рабочая температура	-40??C до 85??C (промышленный класс)
Тип упаковки	8-pin ACTM (Lead-Free Thin Small Outline Package, TSOT23)

Advantages of MAX4397DACTM+ Over Audio Op-Amp Alternatives

The MAX4397DACTM+ stands out with its industry-leading low noise, high bandwidth, and power efficiency??core strengths of ADI??s premium audio op-amp portfolio. Unlike standard audio op-amps (with noise densities of 3nV/??Hz or higher), its 1.2nV/??Hz rating ensures minimal interference when amplifying ultra-weak signals (e.g., 20dBm condenser microphone outputs or turntable phono signals). This is critical for professional audio gear and medical devices, where even faint noise can obscure critical details (e.g., vocal nuances or heart sounds).

??ADI??s MAX4397 transformed our flagship portable audio interface,?? says Jason Chen, Senior Audio Engineer at ProSound Labs. ??The MAX4397DACTM+??s 1.2nV/??Hz noise density eliminated background hiss in recordings, while its 2.9mA current extended battery life from 6 to 8 hours. The 8-pin ACTM package also let us shrink the interface by 30%??a win for portability.?? Compared to high-performance op-amps that sacrifice power for noise performance, it balances 12MHz GBW (enough for Hi-Res audio up to 192kHz) with low quiescent current??ideal for battery-powered devices like wireless mics or portable patient monitors. Its rail-to-rail output also eliminates signal clipping at low voltages, a common issue with op-amps limited to narrow output ranges (e.g., 1V below supply rails).

Экосистема ADI еще больше ускоряет развитие:. EVAL-MAX4397 Evaluation Kit includes pre-configured circuits for microphone preamps and line-level amplification, plus test points for measuring noise and gain. Paired with ADI??s Audio Design Toolbox (which provides gain resistor and filter calculation templates), engineers cut design time by 40% vs. manual testing. ADI??s 10+ year lifecycle commitment also ensures long-term supply??critical for professional audio and medical devices with multi-year production runs.

Typical Applications for MAX4397DACTM+

The MAX4397DACTM+ excels in noise-sensitive audio systems where precision and reliability align with ADI??s engineering expertise:

• Professional Audio: Powers studio microphone preamps, portable audio interfaces, and broadcast mixers??ensuring clean signal amplification for music recordings, podcasts, and live broadcasts.
• Медицинские приборы: Supports hearing aids, patient monitors (e.g., heart sound recorders), and diagnostic equipment??amplifying weak physiological audio signals without adding noise that could obscure clinical data.
• Потребительская электроника: Drives high-end turntable phono preamps, wireless microphones, and Hi-Res audio players??preserving subtle sound details for audiophile-grade playback.

Frequently Asked Questions About MAX4397DACTM+

What does ??1.2nV/??Hz noise density?? mean for real-world audio performance?

Noise density measures the op-amp??s inherent noise per square root of frequency. A 1.2nV/??Hz rating means it adds only 1.2 nanovolts of noise per cycle across audio frequencies (20Hz?C20kHz). For microphones, this translates to ??silent?? amplification??no audible hiss during quiet recordings (e.g., acoustic guitar or whispered vocals). For medical devices, it ensures faint heart or lung sounds aren??t masked by electrical noise.

Why is the 12MHz gain bandwidth product (GBW) important for Hi-Res audio?

GBW defines the maximum frequency at which the op-amp maintains its gain. Hi-Res audio (e.g., 192kHz sampling) requires a bandwidth of ~1.2MHz (per the Nyquist theorem, which mandates 2x the highest frequency). A 12MHz GBW provides 10x headroom, ensuring the op-amp amplifies all audio frequencies evenly??no roll-off or distortion at high frequencies (e.g., 20kHz treble notes).

Which ADI tools simplify designing with the MAX4397DACTM+?

ADI? EVAL-MAX4397 Kit includes a pre-wired MAX4397DACTM+, power supplies, and audio input/output connectors??ready to test with microphones or line sources. The Audio Design Toolbox offers templates to calculate gain resistors, filter components, and power requirements, avoiding manual math errors. These tools let engineers validate designs in hours, not days??cutting development time by 40%.

Can this op-amp operate in battery-powered devices like wireless microphones?

Yes??its 2.9mA quiescent current and 2.7V?C5.5V voltage range make it ideal for battery power. For example, a wireless mic using two AA batteries (3V total) will maintain full performance until the batteries drain to 2.7V. Its 0.1??A shutdown current also extends standby life??mics can stay powered off for months without battery loss.

How does the MAX4397DACTM+ compare to ADI??s MAX4298EUB audio op-amp?

The MAX4397DACTM+ has lower noise (1.2nV/??Hz vs. 1.8nV/??Hz for the MAX4298EUB) and higher GBW (12MHz vs. 10MHz), making it better for ultra-noise-sensitive applications (e.g., medical monitors, pro audio). The MAX4298EUB uses slightly less current (2.9mA vs. 3.5mA) but has lower performance. The MAX4397DACTM+ targets premium use cases where noise reduction is non-negotiable.