MAX98357 I2S 3W Class D Audio Amplifier Module

The MAX98357 is a high-efficiency Class D audio power amplifier module that uses a digital I2S interface to deliver up to 3W of clean audio directly to a speaker. Because it accepts digital audio input directly, it eliminates the need for an external DAC (Digital-to-Analog Converter) or complex analog filtering. It is ideal for microcontrollers and single-board computers like ESP32, Raspberry Pi, and Arduino for Internet Radio, voice prompts, and smart speaker projects.

Key Features:

• Direct I2S Input: Connects directly to microcontrollers via I2S, eliminating noise associated with analog signals.

• High Efficiency Class D: Delivers up to 3W at 10% THD into a 4Ω speaker using a 5V power supply.

• No External DAC Required: Built-in internal DAC decodes digital audio formats seamlessly.

• Wide Supply Voltage: Operates reliably from 2.5V to 5.5V DC.

• Gain Configuration: Selectable gain levels (3dB, 6dB, 9dB, 12dB, 15dB) via onboard configuration pins.

Specifications:

• Output Power: 3.2W at 4Ω (10% THD, 5V)

• Operating Voltage: 2.5V – 5.5V DC

• Audio Interface: I2S (Inter-IC Sound)

• Sample Rate Support: 8kHz – 96kHz

• Signal-to-Noise Ratio (SNR): 92dB

• Board Type: Mono Class D Amplifier