MAX98357 I2S 3W CLASS D Audio Decoder Amplifier Module

MAX98357 I2S 3W CLASS D Audio Decoder Amplifier Module is a high-performance, plug-and-play digital audio solution that combines a Digital-to-Analog Converter (DAC) and a Class D amplifier into a single, compact breakout board. This module utilizes the I2S digital interface to receive audio data directly from microcontrollers or single-board computers like the Raspberry Pi or ESP32. Consequently, it eliminates the need for an external DAC or complex analog circuitry, providing crisp and clear audio output with minimal noise interference. Furthermore, the Class D architecture ensures high efficiency, allowing the device to deliver up to 3.2 W of power into a 4 Ω load while generating very little heat. Therefore, you should choose this module for any portable or embedded project where space is limited and high-quality sound is a priority.

Key Features:

• Integrated DAC and Amplifier: Combines digital audio decoding and amplification in one chip, significantly simplifying the overall system design.
• High Efficiency: Features a Class D architecture that maximizes battery life and reduces the need for bulky heatsinks.
• Flexible Gain Settings: Allows users to configure multiple gain levels (3 dB, 6 dB, 9 dB, 12 dB, and 15 dB) via a single pin to match different input sources.
• Sample Rate Support: Handles a wide range of sample rates from 8 kHz up to 96 kHz, ensuring compatibility with most digital audio formats.
• Automatic Configuration: Detects 35 different clocking configurations automatically, which simplifies the software setup on the host controller.

Technical Specifications:

• Supply Voltage Range: 2.5 V to 5.5 V_DC
• Output Power (at 5V): 3.2 W into 4 Ω at 10% THD; 1.8 W into 8 Ω at 10% THD
• Interface Type: I2S (Inter-IC Sound)
• Signal-to-Noise Ratio (SNR): 98 dB
• Efficiency: ≈ 92% (into 8 Ω load)
• Dynamic Range: 102 dB (A-weighted)
• Quiescent Current: ≈ 3.2 mA

Mechanical Specifications:

• Board Material: High-quality FR-4 PCB with gold-plated pads for superior conductivity.
• Mounting Type: Through-hole pin headers (2.54 mm pitch) and screw terminals for speaker output.
• Chip Package: TQFN-9 (Integrated on the module).

Dimensions:

• Module Length: ≈ 19.5 mm
• Module Width: ≈ 17.5 mm
• Module Height: ≈ 3.0 mm (excluding headers)
• Weight: ≈ 2.5 g

Pinout and Wiring:

• LRC (Left/Right Clock): Connect to the Word Select (WS) pin of your I2S host.
• BCLK (Bit Clock): Connect to the Serial Clock (SCK) pin of your I2S host.
• DIN (Data In): Connect to the Serial Data (SD) output of your I2S host.
• GAIN: Connect to GND, VCC, or leave floating to set the desired amplification level.
• SD (Shutdown): Pull low to shut down the chip; pull high or leave floating for active operation.
• GND / VIN: Connect to your power source (2.5 V − 5.5 V).
• Speaker Output: Use the screw terminals or soldering pads to connect a 4 Ω or 8 Ω speaker.

Datasheet Reference:

• Download MAX98357A/B Datasheet

Commonly Used in:

• Raspberry Pi Projects: Providing high-quality audio for retro gaming consoles and media centers.
• ESP32 Audio Streaming: Acting as the primary sound output for internet radio and smart home voice assistants.
• Arduino Sound Modules: Adding voice prompts or music playback to sophisticated microcontroller projects.

Applications:

• Portable Bluetooth Speakers: Serving as the main driver for small, battery-operated audio devices.
• IoT Voice Notification: Integrating audio alerts into connected industrial sensors or home security systems.
• Handheld Gaming Devices: Driving internal speakers in DIY handheld consoles with minimal power draw.
• Electronic Toys: Implementing sound effects and speech synthesis in consumer-grade toys.

Equivalent Models:

• MAX98357B: A variation of the same chip that utilizes a different I2S data format (left-justified), however, the “A” version is the most common for standard I2S.
• UDA1334A: A popular I2S DAC, though it lacks the built-in 3W amplifier stage found on the MAX98357.
• PCM5102A: High-end I2S DAC that requires an external amplifier for speaker output.

Package Includes:

• 1 x Max98357 I2S 3W Class D Amplifier Breakout Interface Dac Decoder Module Filterless Audio Board For Raspberry Pi Esp32
• 1 x 7-Pin Male Header Strip
• 1 x 2-Pin Screw Terminal Block