MAX98357A

Overview

MAX98357A is an integrated I2S-input audio DAC with a built-in Class D speaker amplifier. It accepts digital audio over an I2S interface from a microcontroller or audio codec and drives a small speaker with minimal external components. The device is intended for compact, low-component-count designs that need direct digital-to-speaker audio playback.

Why Choose This Part

Combines a digital-input DAC with a Class D power stage to reduce board area and component count compared with separate DAC plus power-amp solutions. Digital I2S input preserves audio quality by avoiding intermediate analog routing and lets the host stream decoded audio directly. Class D operation improves efficiency for battery-powered designs and simplifies speaker connection.

Applications

Getting Started

Read the MAX98357A datasheet and reference schematic for supply, decoupling, and speaker connection recommendations before board layout. Development is easiest with a host that supports I2S (for example, Raspberry Pi, many ARM MCUs, or a DSP); use the host audio subsystem (ALSA on Linux) or an I2S library on microcontroller toolchains to send audio frames. Look for breakout/evaluation boards or community examples that show wiring, power sequencing, and recommended I2S format settings.

MAX98357 Family

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