MAX9721AETC

Audio Amplifiers Overview

The MAX9721AETC is a fixed-gain, stereo headphone amplifier utilizing DirectDrive architecture for single-supply operation. It delivers up to 20mW per channel into a 32Ω load with 0.006% THD+N. The device operates from a 0.9V to 1.8V supply, drawing 2.2mA of current. Key features include ±8kV ESD protection, comprehensive click-and-pop suppression, and an 80dB PSRR at 1kHz. A low-power shutdown mode reduces supply current to 1.0µA. It is available in UCSP and TQFN packages.

Audio Amplifiers Feature Summary

• DirectDrive architecture produces ground-referenced outputs from a single supply, eliminating the need for large DC-blocking capacitors.
• Fixed gain configuration (-2V/V) eliminates the external feedback network, reducing component count.
• Comprehensive click-and-pop circuitry suppresses audible transients during startup and shutdown.
• High power-supply rejection ratio (PSRR) allows operation from noisy digital supplies without additional linear regulators.

Audio Amplifiers Applications

• Portable equipment requiring minimal board space
• Single-cell battery-powered audio devices
• Headphone amplification in mobile phones

Audio Amplifiers Procurement Notes

Verify package availability as the MAX9721AETC specifically denotes the UCSP package variant. Confirm RoHS compliance status through official documentation. Check for obsolescence notices or lifecycle changes directly from Analog Devices. Ensure pinout compatibility if replacing older versions. Validate operating temperature range requirements against specific application constraints.

Audio Amplifiers Selection Notes

Select this part for applications prioritizing ultra-low voltage operation and minimal external components. The fixed -2V/V gain suits systems requiring specific signal attenuation. Consider the UCSP package for tight space constraints. Evaluate the 0.9V minimum supply requirement against battery discharge curves. Verify that the 20mW output power meets the target headphone impedance needs.

Audio Amplifiers Part Context

This component belongs to the MAX9721 family of DirectDrive stereo headphone amplifiers. It shares architectural similarities with other members like the MAX9721B and MAX9721C, differing primarily in fixed gain settings. The family targets portable electronics where size and power efficiency are critical design parameters.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers: MAX9721BETC, MAX9721CETC. These variants offer different fixed gains (-1.5V/V and -1V/V respectively) while maintaining identical packaging and core functionality.