General Description

The MAX4291/MAX4292/MAX4294 family of micropower operational amplifiers operates from a 1.8V to 5.5V single supply or ±0.9V to ±2.75V dual supplies and has Rail-to-Rail? input/output capabilities. These amplifiers provide a 500kHz gain-bandwidth product and 120dB open-loop voltage gain while using only 100μA of supply current per amplifier. The combination of low input offset voltage (±200μV) and high open-loop gain makes them ideal for low-power/low-voltage, high-precision portable applications.

Features

? Ultra-Low Voltage Operation—Guaranteed Down to 1.8V

? 100μA Supply Current per Amplifier

? 500kHz Gain-Bandwidth Product

? 120dB Open-Loop Voltage Gain (RL = 100k?)

? 0.017 Total Harmonic Distortion Plus Noise (THD + N) at 1kHz

? Rail-to-Rail Input Common-Mode Range

? Rail-to-Rail Output Drives 2k? Load

? No Phase Reversal for Overdriven Inputs

? Unity-Gain Stable for Capacitive Loads up to 100pF

? 200μV Input Offset Voltage (MAX4292/MAX4294)

? Single in Small 5-Pin SC70

? Available in Ultra-Small Packages:

??? 5-Pin SC70 (MAX4291)

??? 8-Bump UCSP (MAX4292)

Applications

??? 2-Cell Battery-Operated Systems

??? Portable Electronic Equipment

??? Battery-Powered Instrumentation

??? Digital Scales

??? Strain Gauges

??? Sensor Amplifiers

??? Cellular Phones