MAX9776ETJ+

Audio Amplifiers Overview

The MAX9776ETJ+ is a stereo Class D audio power amplifier with an integrated DirectDrive headphone amplifier, housed in a 32-pin TQFN package. It operates on a single supply voltage ranging from 2.7V to 5.5V. The device delivers up to 1.5W of output power into a 4Ω load at 5V and provides up to 50mW for mono receiver or stereo headphone outputs into 32Ω loads at 3.3V. It features ultra-low EMI through spread-spectrum modulation, I²C control for volume and configuration, and comprehensive protection including thermal shutdown and current limiting.

Audio Amplifiers Feature Summary

• Ultra-low EMI achieved via active emissions limiting and spread-spectrum modulation, eliminating the need for external output filters.
• DirectDrive architecture enables ground-referenced outputs from a single supply, removing the requirement for large DC-blocking capacitors.
• Flexible user-defined mixer architecture supports multiple inputs, digital volume control, and output mixing via I²C interface.
• Integrated click-and-pop suppression ensures quiet startup and mute transitions.

Audio Amplifiers Applications

• Cell Phones
• Portable Multimedia Players
• Handheld Gaming Consoles

Audio Amplifiers Procurement Notes

Verify component authenticity by checking markings against official Analog Devices documentation. Confirm the 32-TQFN package type and exposed pad configuration match the datasheet specifications. Ensure the ordering suffix indicates lead-free/RoHS compliance as required for your assembly process. Cross-reference the part number with authorized distributors to confirm availability status.

Audio Amplifiers Selection Notes

Select this component when designing portable audio systems requiring high efficiency and minimal external components. The integrated DirectDrive amplifiers simplify board layout by removing bulky capacitors. Verify that the application requires I²C control for gain and volume adjustments. Ensure the system operates within the specified 2.7V to 5.5V supply range and -40°C to +85°C temperature limits.

Audio Amplifiers Part Context

This device belongs to Maxim’s third-generation ultra-low-EMI Class D audio amplifier family. It combines a high-efficiency stereo speaker amplifier with mono receiver and stereo headphone amplifiers. The MAX9776 specifically utilizes a 32-pin TQFN package, distinguishing it from the MAX9775 which offers a WLP option. It is designed to provide Class AB performance levels with Class D efficiency.

Audio Amplifiers Replacement Considerations

The MAX9775 serves as a functional alternative offering identical amplifier capabilities but available in a 36-bump WLP package. Designers must account for the pinout differences between the 32-pin TQFN and 36-bump WLP packages when substituting parts.

Audio Amplifiers FAQ

Does the MAX9776 require external output filtering?

No, the device utilizes active emissions limiting circuitry and spread-spectrum modulation to significantly reduce EMI, eliminating the need for output filtering found in traditional Class D devices.

How is the volume controlled on the MAX9776?

Volume control is managed digitally through the I²C interface, allowing for flexible user-defined mixer architecture and gain settings.

What is the purpose of the DirectDrive architecture?

The DirectDrive architecture produces a ground-referenced output from a single supply, which eliminates the need for large DC-blocking capacitors, thereby saving cost, space, and component height.