MAX9945

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38V, Low-Noise, MOS-Input, Low-Power Op Amp

Great Combination of Low Power and Low Noise in a Small Package

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • +4.75V to +38V Single-Supply Voltage Range
  • ±2.4V to ±19V Dual-Supply Voltage Range
  • Rail-to-Rail Output Voltage Swing
  • 400µA Low Quiescent Current
  • 50fA Low Input Bias Current
  • 1fA/ Low Input Current Noise
  • 15nV/ Low Noise
  • 3MHz Unity-Gain Bandwidth
  • Wide Temperature Range from -40°C to +125°C
  • Available in Space-Saving, 6-Pin TDFN Package (3mm x 3mm)

The MAX9945 operational amplifier features an excellent combination of low operating power and low input voltage noise. In addition, MOS inputs enable the MAX9945 to feature low input bias currents and low input current noise. The device accepts a wide supply voltage range from 4.75V to 38V and draws a low 400µA quiescent current. The MAX9945 is unity-gain stable and is capable of rail-to-rail output voltage swing.

The MAX9945 is ideal for portable medical and industrial applications that require low noise analog front-ends for performance applications such as photodiode transimpedance and chemical sensor interface circuits.

The MAX9945 is available in both an 8-pin µMAX® and a space-saving, 6-pin TDFN package, and is specified over the automotive operating temperature range (-40°C to +125°C).

Applications

  • Active Filters and Signal Processing
  • Automatic Test Equipment (ATE)
  • Chemical Sensor Interface
  • Displays: Industrial, Front Panel, and Instrumentation
  • High-Performance Audio Line Out
  • Industrial Sensors and Instrumentation
  • Industrial: Process Measurement and Control
  • Medical Pulse Oximetry
  • Panel Meters
  • Photodiode Sensor Interface
  • Power Meters
  • Programmable Logic Controllers (PLCs)
MAX9945
38V, Low-Noise, MOS-Input, Low-Power Op Amp
MAX9945: Typical Operating Circuit
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Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 3

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Evaluation Kits

MAX9945EVKIT

Evaluation Kit for the MAX9945

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Features and Benefits

  • Accommodates Multiple Op-Amp Configurations
  • Wide Input Supply Range
  • 0805 Components
  • Lead(Pb)-Free and RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX9945 evaluation kit (EV kit) provides a proven design to evaluate the MAX9945 low-noise, MOS-input, low-power op amp in an 8-pin µMAX® package. Various test points are provided for easy evaluation. The EV kit circuit is preconfigured as a transimpedance amplifier (TIA), but can easily be adapted to act as a noninverting, inverting, or differential amplifier by changing a few components. MOS-input bias currents, low input-voltage noise, and rail-to-rail output stage make this device ideal for photodiode transimpedance amplifiers, piezo buffers, and audio line out applications. The components have pads that accommodate 0805 packages, making them easy to solder and replace. The MAX9945 EV kit PCB comes with a MAX9945AUA+ installed. Note that the MAX9945 is also available in a 3mm x 3mm TDFN package.

Applications

  • Active Filters and Signal Processing
  • Chemical Sensor Interface
  • High-Performance Audio Line Out
  • Industrial Sensors and Instrumentation
  • Medical Pulse Oximetry
  • Photodiode Sensor Interface
MAX9945EVKIT
Evaluation Kit for the MAX9945

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MAX9945
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