MAX4274CAESA

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4274CAESA is a dual-channel fixed-gain amplifier from the GainAmp family, featuring factory-trimmed internal resistors for 0.1% gain accuracy. It operates on a single +2.5V to +5.5V supply with 300µA current consumption. The device offers noninverting gains from +1.25V/V to +101V/V and inverting gains from -0.25V/V to -100V/V. Key electrical parameters include a 700mV/µs slew rate, 90nV/√Hz input noise voltage density, and rail-to-rail output capability driving 1kΩ loads. Inputs withstand ±17V fault protection.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Integrates precision laser-trimmed internal gain-setting resistors to minimize design size and layout complexity while ensuring high gain accuracy.
• Features high-voltage fault protection capable of withstanding ±17V at either input without excessive current draw or output phase reversal.
• Provides rail-to-rail outputs that maintain excellent DC accuracy while driving 1kΩ loads and remain stable with capacitive loads up to 470pF.

Instrumentation, Op Amps, Buffer Amps Applications

• Portable Instruments
• Smart-Card Readers
• Infrared Receivers for Remote Controls
• Keyless Entry Systems
• Low-Side Current-Sense Amplifiers

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'CAESA' against official Analog Devices documentation to confirm package type (SOIC) and temperature range (-40°C to +85°C). Ensure the required gain code is correctly appended to the base part number as per the manufacturer's Gain Selection Guide. Confirm availability status directly with authorized distributors as stock levels fluctuate.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a fixed gain configuration is required to reduce external component count and board space. Choose the MAX4274 variant over the MAX4275 if internal VCC/2 biasing is not needed for the application. Consider the GBW product trade-off, as higher fixed gains offer increased bandwidth compared to unity-gain-stable op amps configured for similar gains.

Instrumentation, Op Amps, Buffer Amps Part Context

This device belongs to the Maxim Integrated GainAmp family, which combines low-cost rail-to-rail operational amplifiers with precision internal feedback networks. The dual-channel MAX4274 provides two independent fixed-gain amplifiers in an 8-pin SO package, serving as a drop-in replacement for discrete op-amp and resistor gain blocks in standard pinout designs.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

MAX4174CAESA (Single Channel)

Instrumentation, Op Amps, Buffer Amps FAQ

How does the GainAmp architecture affect bandwidth compared to standard op amps?

The MAX4274 uses strategic decompensation of the op-amp core to maximize bandwidth for specific gain settings. For example, a gain of +100V/V achieves a -3dB bandwidth of 230kHz, significantly higher than a unity-gain-stable op amp configured for the same gain.

What is the function of the internal biasing in the MAX4275 variant?

The MAX4275 includes internal VCC/2 biasing at the noninverting input using two 150kΩ resistors. This feature simplifies AC-coupled single-supply designs by eliminating external bias resistors and allowing maximum signal swing at the rail-to-rail output.