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General Description

The MAX4194 is a variable-gain precision instrumentation amplifier that combines Rail-to-Rail? single-supply operation, outstanding precision specifications, and a high gain bandwidth. This amplifier is also offered in three fixed-gain versions: the MAX4195 (G = +1V/V), the MAX4196 (G = +10V/V), and the MAX4197 (G = +100V/V). The fixed-gain instrumentation amplifiers feature a shutdown function that reduces the quiescent current to 8μA. A traditional three operational amplifier configuration is used to achieve maximum DC precision.

The MAX4194–MAX4197 have rail-to-rail outputs and inputs that can swing to 200mV below the negative rail and to within 1.1V of the positive rail. All parts draw only 93μA and operate from a single +2.7V to +7.5V supply or from dual ±1.35V to ±3.75V supplies. These amplifiers are offered in 8-pin SO packages and are specified for the extended temperature range (-40°C to +85°C).

See the MAX4198/MAX4199 data sheet for single-supply, precision differential amplifiers.

Features

? +2.7V Single-Supply Operation

? Low Power Consumption

93μA Supply Current

8μA Shutdown Current

(MAX4195/MAX4196/MAX4197)

? High Common-Mode Rejection: 115dB (G = +10V/V)

? Input Common-Mode Range Extends 200mV Below GND

? Low 50μV Input Offset Voltage (G ≥ +100V/V)

? Low ±0.01 Gain Error (G = +1V/V)

? 250kHz -3dB Bandwidth (G = +1V/V, MAX4194)

? Rail-to-Rail Outputs

Applications

Medical Equipment

Thermocouple Amplifier

4–20mA Loop Transmitters

Data-Acquisition Systems

Battery-Powered/Portable Equipment

Transducer Interface

Bridge Amplifier