MAX98357 I2S 3W DAC Amplifier

This module with the MAX98357 converts digital audio via I2S (not to be confused with I2C) into an analogue signal and amplifies it with a class D amplifier for one speaker. At 5 V and 4 Ω it delivers up to 3.2 W. The I2S inputs accept 3.3 V and 5 V logic, so it fits the ESP32, Arduino or Raspberry Pi. The gain can be selected from 3 dB to 15 dB via the GAIN pin; with the pin open it is 9 dB.

Recommended Accessories:

• Speaker 4Ohm 3W 50mm
• 3W 8Ohm Speaker in Housing

Features:

• Gain: GAIN open 9 dB, to GND 12 dB, via 100 kΩ to GND 15 dB, to VIN 6 dB, via 100 kΩ to VIN 3 dB
• SD to LOW shuts down the amplifier
• No MCLK required
• Speaker with at least 4 Ω on the screw terminal; do not connect the outputs to GND (bridge-tied output)
• Connections: LRC, BCLK, DIN, GAIN, SD, GND, VIN

Application Examples:

• Audio and speech output with the ESP32
• Internet radio or MP3 player
• Speaker for a voice assistant with I2S microphone
• Integration into Home Assistant with ESPHome

Documentation:

• MAX98357 I2S class D amplifier guide (Adafruit)
• ESPHome documentation: I²S Audio Speaker

Technical Data:

• Chip: MAX98357
• Supply: 2.5 to 5.5 V
• Output power: up to 3.2 W into 4 Ω at 5 V
• Input: I2S, 8 to 96 kHz
• Amplifier: class D, mono
• Gain: 3, 6, 9, 12 or 15 dB
• Connections: LRC, BCLK, DIN, GAIN, SD, GND, VIN, screw terminal for the speaker
• Dimensions: 17.7 × 18.8 × 2.5 mm
• Weight: 3 g

Scope of Delivery:

• 1× MAX98357 I2S 3W DAC Amplifier
• 1× 7-pin header
• 1× 2-pin screw terminal