MAX9702EUI+

Audio Amplifiers Overview

The MAX9702EUI+ is a stereo audio amplifier integrating a Class D speaker stage and a DirectDrive Class AB headphone stage. It delivers up to 1.8W into 4Ω or 1.1W into 8Ω at 5V. The device operates on a single supply from 2.5V to 5.5V with quiescent currents of 10-15mA (speaker) and 7-11mA (headphone). Shutdown current is 0.1µA. Speaker THD+N is 0.07% at 1kHz, SNR exceeds 97dB, and PSRR reaches 75dB. Headphone output is 48mW into 32Ω at 3.3V. It uses a 28-pin TQFN-EP package.

Audio Amplifiers Feature Summary

• Integrates a filterless Class D speaker amplifier and a DirectDrive Class AB headphone amplifier in a single package.
• Utilizes spread-spectrum modulation to reduce electromagnetic interference emissions without external output filters.
• Features an I2C interface for programmable gain, mute, mono/stereo mixing, and mode selection.
• Includes comprehensive protection against short circuits and thermal overload.

Audio Amplifiers Applications

• Cellular phones
• Notebook PCs
• PDAs
• Handheld gaming consoles

Audio Amplifiers Procurement Notes

Verify the specific suffix 'EUI+' corresponds to the 28-pin TQFN-EP package and lead-free construction as documented. Confirm the operating temperature range matches the specified -40°C to +85°C limits. Ensure the I2C slave address configuration aligns with system requirements. Validate that the exposed paddle connection meets thermal management needs for the target application.

Audio Amplifiers Selection Notes

Select this component when a combined speaker and headphone solution is required to minimize board space. The integrated DirectDrive architecture eliminates the need for large DC-blocking capacitors typically required by single-supply headphone amplifiers. The low shutdown current supports extended battery life in portable devices. Verify that the I2C control logic voltage levels are compatible with the host microcontroller.

Audio Amplifiers Part Context

The MAX9702 belongs to Maxim Integrated's portfolio of high-efficiency audio power amplifiers designed for mobile electronics. It combines second-generation spread-spectrum modulation technology with a high-linearity Class AB headphone driver. This integration addresses the demand for compact, high-performance audio subsystems in portable consumer devices where power efficiency and signal quality are critical.

Audio Amplifiers Replacement Considerations

MAX9702ETI+

Audio Amplifiers FAQ

How does the MAX9702 eliminate the need for an output filter?

The speaker amplifier utilizes a spread-spectrum modulation scheme that significantly reduces EMI radiated emissions, allowing for a filterless design.

What is the function of the HPS pin?

The HPS (Headphone Sense) pin selects the operational mode. Connecting it to VDD enables headphone mode, while connecting it to GND enables speaker mode.