MAX4194ESA+

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4194ESA+ is a micropower, single-supply, rail-to-rail precision instrumentation amplifier in an 8-pin SO package. It features variable gain set by an external resistor between +1V/V and +10,000V/V using the formula G = 1 + (50kΩ/RG). Operating from a single +2.7V to +7.5V supply or dual ±1.35V to ±3.75V supplies, it draws 93µA quiescent current. Key specifications include a 250kHz bandwidth at unity gain, 115dB common-mode rejection at higher gains, and a low input offset voltage of 50µV.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Variable gain configuration allows flexibility for diverse signal conditioning needs via a single external resistor.
• Rail-to-rail inputs and outputs maximize dynamic range for single-supply operation.
• High precision with low input offset voltage and high common-mode rejection ratio.
• Micropower consumption ensures efficiency in battery-powered applications.

Instrumentation, Op Amps, Buffer Amps Applications

• Medical equipment
• Thermocouple amplifiers
• 4–20mA loop transmitters
• Data-acquisition systems
• Transducer interface

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the component matches the exact MAX4194ESA+ designation, as other variants like MAX4195/6/7 have fixed gains. Confirm the suffix indicates RoHS compliance. Check datasheet revisions for any updates to electrical characteristics or pin configurations before finalizing procurement.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this part when variable gain is required within a precision instrumentation amplifier family. Compare against fixed-gain counterparts if gain requirements are static. Ensure the external gain-setting resistor tolerance aligns with system accuracy needs, as it impacts overall gain error and drift.

Instrumentation, Op Amps, Buffer Amps Part Context

Part of the MAX4194–MAX4197 family of micropower instrumentation amplifiers. The MAX4194 offers variable gain, while MAX4195, MAX4196, and MAX4197 provide fixed gains of +1V/V, +10V/V, and +100V/V respectively. All share similar power and precision characteristics.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct functional replacements include MAX4195ESA+, MAX4196ESA+, and MAX4197ESA+ if fixed gain is acceptable. Verify pin compatibility and electrical parameter alignment with the original design requirements.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the gain of the MAX4194ESA+ adjusted?

The gain is set externally by connecting a resistor between pins 1 and 8 (RG- and RG+) using the equation G = 1 + (50kΩ/RG).

Does the MAX4194ESA+ support shutdown mode?

No, the MAX4194 does not have a shutdown pin. Shutdown functionality is available only in the MAX4195, MAX4196, and MAX4197 variants.

What is the input common-mode voltage range?

The input common-mode range extends from VEE - 0.2V to VCC - 1.1V.