MAX4275CAEUA

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4275CAEUA is a dual-channel fixed-gain amplifier from the GainAmp family, manufactured by Analog Devices Inc./Maxim Integrated. It integrates a rail-to-rail operational amplifier with factory-trimmed internal gain-setting resistors and VCC/2 biasing at the noninverting input. The device operates on a single +2.5V to +5.5V supply or ±1.25V to ±2.75V dual supplies, consuming approximately 300µA per amplifier. It features high-voltage fault protection capable of withstanding ±17V inputs without excessive current draw. The unit is housed in an 8-pin µMAX package and supports capacitive loads up to 470pF.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Integrates precision laser-trimmed internal gain-setting resistors for fixed gains ranging from +1.25V/V to +101V/V.
• Includes internal VCC/2 biasing circuitry at the noninverting input to simplify single-supply AC-coupled designs.
• Features rail-to-rail outputs that drive 1kΩ loads while maintaining excellent DC accuracy.
• Provides high-voltage fault protection allowing inputs to withstand ±17V relative to VEE.

Instrumentation, Op Amps, Buffer Amps Applications

• Portable Instruments
• Smart-Card Readers
• Infrared Receivers and Bar-Code Readers
• Keyless Entry Systems
• Low-Side Current-Sense Amplifiers

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'CAEUA' against official manufacturer documentation to confirm the exact temperature range and package variant. Ensure the required gain code matches the ordering guide, as the base part number requires a gain selection suffix. Confirm availability status directly with authorized distributors, as lead times may vary. Cross-reference the datasheet revision date to ensure compliance with current electrical specifications.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a fixed gain configuration is required to reduce external component count and layout complexity. The internal VCC/2 bias makes it suitable for single-supply applications where AC coupling is used. Verify that the required gain falls within the standard offerings available in the Gain Selection Guide. Consider the 300µA supply current for battery-powered designs and ensure the operating temperature range meets environmental requirements.

Instrumentation, Op Amps, Buffer Amps Part Context

This device belongs to the Maxim Integrated GainAmp family, which combines low-cost op amps with precision internal feedback networks. The MAX4275 specifically denotes the dual-channel version with integrated VCC/2 biasing. It complements the open-loop MAX428x series and the non-biased MAX4174/MAX4274 variants. The family utilizes proprietary laser trimming techniques to achieve 0.1% gain accuracy, replacing traditional discrete resistor networks.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct replacements include other members of the GainAmp family such as the MAX4175 (single channel) or MAX4274 (dual channel without VCC/2 bias). For open-loop configurations, the MAX4282 serves as a compatible alternative. Verify pin compatibility and gain accuracy requirements before substitution.