MAX4467EKA+T

Audio Amplifiers Overview

The MAX4467EKA+T is a single-channel microphone preamplifier in an 8-pin SOT-23 package. It operates from a +2.4V to +5.5V supply with a typical quiescent current of 24µA per amplifier. The device features a gain bandwidth product of 200kHz and a slew rate of 45mV/µs at unity gain. Key electrical parameters include an input offset voltage of ±1mV, input bias current of ±2.5nA, common-mode rejection ratio of 126dB, and power-supply rejection ratio of 112dB. It includes a complete shutdown mode reducing supply current to 5nA.

Audio Amplifiers Feature Summary

• Includes a complete shutdown mode that reduces supply current to 5nA and cuts off external microphone bias for ultimate power savings.
• Features rail-to-rail outputs capable of driving loads while swinging within millivolts of the supply rails.
• Provides high open-loop gain and excellent power-supply rejection ratios suitable for noisy environments.

Audio Amplifiers Applications

• Microphone Preamplifiers
• Hearing Aids
• Cellular Phones
• Voice-Recognition Systems

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix EKA+T corresponds to the 8-pin SOT-23 package and -40°C to +85°C temperature range. Confirm RoHS compliance status as indicated by the plus sign. Ensure the component matches the single-channel configuration with shutdown capability distinct from the non-shutdown MAX4465 or dual-channel MAX4469 variants.

Audio Amplifiers Selection Notes

Select this part when a single-channel microphone preamplifier with low-power shutdown is required. It is optimized for voice channel applications due to its specific slew rate characteristics. Consider the decompensated MAX4468 if a minimum stable gain of +5V/V and higher bandwidth are needed instead of the unity-gain stability provided here.

Audio Amplifiers Part Context

Part of the MAX4465–MAX4469 family of micropower op amps designed specifically for microphone preamplification. This series offers an optimized balance between gain bandwidth product and supply current consumption. The MAX4467 variant specifically adds shutdown functionality to the standard single-channel architecture found in the MAX4465.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

Audio Amplifiers FAQ

What is the function of the SHDN pin on the MAX4467?

The SHDN pin controls the complete shutdown mode. Driving it high reduces supply current to 5nA and switches off the bias to the external microphone. Driving it low enables normal operation.

Is the MAX4467EKA+T unity-gain stable?

Yes, the MAX4467 is unity-gain stable and delivers a 200kHz gain bandwidth product from only 24µA of supply current.