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MAX9945：38V, Low-Noise, MOS-Input, Low-Power Op Amp

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

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).

Key Features +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)

MAX9945: Typical Operating Circuit Applications/Uses 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)

DataSheet

Parametrics

Design kits & evaluation modules

• MAX9945EVKIT

Quality and Environmental Data

• MAX9945.pdf

Ordering Information