MAX9812LEXT+T

Audio Amplifiers Overview

The MAX9812LEXT+T is a single-input, fixed-gain microphone amplifier manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 2.7V to 3.6V and features a 20dB fixed gain with a 500kHz bandwidth. The device integrates a low-noise microphone bias supply set at 2.3V. Key electrical specifications include a quiescent current of 230µA, a shutdown mode current of 100nA, and a power-supply rejection ratio of 100dB at 217Hz. Total harmonic distortion plus noise is rated at 0.015%. It utilizes a 6-pin SC-70 package and supports an operating temperature range from -40°C to +85°C.

Audio Amplifiers Feature Summary

• Integrates a low-noise microphone bias supply for simplified circuit design
• Features rail-to-rail outputs for maximum dynamic range
• Includes a low-power shutdown mode to minimize energy consumption
• Provides high power-supply rejection ratio to reduce interference

Audio Amplifiers Applications

• Notebook computers
• Cell phones
• PDAs
• Car kit adapters
• Digital cameras

Audio Amplifiers Procurement Notes

Verify the specific suffix LEXT against the official datasheet to confirm the 2.7V to 3.6V voltage variant and SC-70-6 packaging. Confirm RoHS compliance status through the manufacturer's documentation. Check for obsolescence or lifecycle changes as older Maxim products may have limited availability. Ensure the component matches the required thermal grade for the intended operating environment.

Audio Amplifiers Selection Notes

Select this component when a compact, low-cost solution for portable audio input is required. The fixed 20dB gain suits applications where signal amplification needs are predictable. The integrated bias eliminates external resistor networks. Consider the 2.7V minimum supply voltage constraint for battery-powered designs. The small SC-70 footprint is advantageous for space-constrained mobile devices.

Audio Amplifiers Part Context

This part belongs to the MAX9812/MAX9813 family of tiny, low-cost microphone amplifiers. The 'L' suffix in the model number specifically denotes the lower voltage operating range (2.7V to 3.6V), distinguishing it from the 'H' variant which supports 4.5V to 5.5V. Both variants share identical performance characteristics regarding gain, noise, and package size.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.