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MAX4477ASA+

Dual ultra-low-noise op-amp, 4.5nV/sqrtHz, 10MHz GBW, rail-to-rail output, 0.0002% THD+N in SOIC-8

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Manufacturer Part：

MAX4477ASA+

Package：

SOIC-8 (4.90 x 3.90 mm)

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Description

Product Overview

The MAX4477ASA+ from Analog Devices (Maxim Integrated) is a dual-channel, ultra-low-noise, low-distortion operational amplifier in an SOIC-8 package. It delivers 4.5nV/sqrtHz input voltage noise, 10MHz gain-bandwidth product, and rail-to-rail output with 0.0002% THD+N at 1kHz, making it ideal for audio and precision instrumentation applications.

Key Specifications

Configuration Dual Channel
Gain-Bandwidth Product (GBW) 10MHz
Slew Rate 3V/us
Input Voltage Noise 4.5nV/sqrtHz @ 1kHz
Input Offset Voltage +/-70uV (Max)
Input Bias Current +/-200pA (Max)
Supply Voltage 2.7V ~ 5.5V (Single Supply)
Quiescent Current 2.2mA (Typical, dual)
Output Type Rail-to-Rail Output
THD+N 0.0002% @ 1kHz
Package SOIC-8 (4.90 x 3.90mm)
Operating Temperature -40°C ~ +85°C

Features

  • Ultra-low input voltage noise of 4.5nV/sqrtHz for sensitive signal acquisition
  • Extremely low distortion of 0.0002% THD+N for high-fidelity audio
  • Rail-to-rail output swing maximizes dynamic range
  • Low input offset voltage (+/-70uV max) for precision applications
  • Low input bias current (+/-200pA max) for high-impedance sources
  • Lead-free SOIC-8 package

Applications

  • Professional and consumer audio preamplifiers
  • Medical instrumentation front-ends
  • Precision measurement and test equipment
  • High-resolution ADC driver buffers
  • Low-noise transducer amplifiers

The MAX4477ASA+ from Analog Devices is a dual-channel, ultra-low-noise, low-distortion operational amplifier optimized for audio and precision signal conditioning applications. With an input voltage noise density of only 4.5nV/sqrtHz at 1kHz and total harmonic distortion plus noise (THD+N) of just 0.0002%, this device sets a benchmark for audio-quality amplification. The 10MHz gain-bandwidth product and 3V/us slew rate provide ample bandwidth for audio and low-frequency instrumentation. Rail-to-rail output capability maximizes dynamic range in single-supply applications. The low input offset voltage of +/-70uV maximum and low input bias current of +/-200pA maximum ensure precision in DC-coupled circuits.

The MAX4477 employs a complementary bipolar input stage with laser-trimmed resistors to achieve ultra-low noise and distortion. The input stage uses large-geometry transistors operating at optimal bias currents to minimize 1/f noise while maintaining low input bias current. The rail-to-rail output stage uses a common-emitter configuration that allows the output to swing to within millivolts of both supply rails. Internal frequency compensation ensures stability in unity-gain configurations. The dual-channel architecture provides matched amplifier characteristics for differential signal processing.

Pin Name Function
1 OUT_A Channel A output
2 IN-_A Channel A inverting input
3 IN+_A Channel A non-inverting input
4 VSS Negative supply / Ground
5 IN+_B Channel B non-inverting input
6 IN-_B Channel B inverting input
7 OUT_B Channel B output
8 VDD Positive supply (2.7V-5.5V)
  • Professional Audio Preamplifier: 4.5nV/sqrtHz noise floor and 0.0002% THD+N preserve audio fidelity in microphone preamp stages
  • Medical ECG/EKG Front-End: Ultra-low noise amplifies microvolt-level biopotential signals with low bias current
  • 24-bit ADC Driver: Rail-to-rail output maximizes ADC dynamic range; 10MHz GBW supports oversampled converters
  • Precision Weigh Scale: +/-70uV max offset and low noise enable sub-milligram resolution in bridge transducer applications
Model Manufacturer Key Difference
OPA1652 TI Dual, 4.5nV/sqrtHz, 18MHz GBW, FET input
LME49720 TI Dual, 2.7nV/sqrtHz, 55MHz GBW
AD8656 ADI Dual, 2.7nV/sqrtHz, 28MHz GBW
MAX4475 ADI Single channel version of MAX4477
NE5532 TI Dual, 5nV/sqrtHz, 10MHz, industry standard
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Service & Packaging

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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