MAX4239ASA

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4239ASA+ is a decompensated, ultra-high precision operational amplifier featuring patented autocorrelating zeroing to eliminate DC offset and drift. It operates on a single 2.7V to 5.5V supply with 600µA current consumption and includes an active-low shutdown mode reducing current to 0.1µA. The device offers a 6.5MHz gain-bandwidth product, 1.6V/µs slew rate, and 150dB open-loop gain. It provides rail-to-rail output swing and features ground-sensing inputs within a narrow SOIC-8 package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Patented autocorrelating zeroing technique continuously measures and compensates input offset voltage, eliminating drift over time and temperature while canceling 1/f noise.
• Decompensated architecture ensures stability for closed-loop gains of 10V/V or higher, providing a high gain-bandwidth product suitable for demanding signal processing tasks.
• Rail-to-rail output capability allows the output voltage to swing close to both supply rails, maximizing dynamic range in low-voltage applications.
• Active-low shutdown pin reduces supply current to 0.1µA when disabled, significantly lowering power consumption in battery-operated systems.

Instrumentation, Op Amps, Buffer Amps Applications

• Thermocouple signal conditioning
• Strain gauge interface circuits
• Electronic scales and load cells
• Medical instrumentation front ends
• High-accuracy analog-to-digital converter buffers

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide to confirm package type and automotive qualification status. Ensure the selected variant matches the required stability gain constraints. Confirm RoHS compliance and lead-free status if mandated by the design specifications. Cross-reference the datasheet revision date to ensure all electrical characteristics align with the production batch requirements.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when ultra-low offset and drift are critical, as it outperforms standard chopper amplifiers in intermodulation distortion. The decompensated nature requires a minimum stable gain of 10V/V; designs requiring unity-gain stability must use the MAX4238 variant instead. Consider the 6.5MHz bandwidth for applications needing faster settling times than the MAX4238 can provide.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the MAX4238/MAX4239 family of precision amplifiers designed for high-performance sensor interfaces. While sharing the same core autozeroing technology and low-power profile, the MAX4239 differs from the MAX4238 by being decompensated for higher speed. This distinction dictates its application in circuits where gain is maintained at 10V/V or greater.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

MAX4238ASA+ (Unity-gain stable alternative)

Instrumentation, Op Amps, Buffer Amps FAQ

What is the minimum stable closed-loop gain for the MAX4239?

The MAX4239 is decompensated and is stable only for closed-loop gains of 10V/V or higher.

How does the device handle 1/f noise?

It uses a patented autocorrelating zeroing technique that treats 1/f noise as a slow-varying offset error, inherently canceling it along with the DC offset.

What is the function of the SHDN pin?

The SHDN pin controls the shutdown mode. Pulling it low stops the internal clock and places the output in a high-impedance state, reducing supply current to 0.1µA.