MAX98357A I2S Amplifier Module

The module from DFRobot is a class D digital amplifier with the MAX98357A. It takes the audio signal via I2S directly from a microcontroller such as the ESP32 and drives a speaker with up to 2.5 W into 4 Ω at 5 V. It is powered with 3.3 to 5 V. The speaker is connected to the PH2.0 socket or to the solder pads, and thanks to the castellated holes the module can also be soldered directly onto a circuit board.

Recommended Accessories:

• 3W 8Ohm Speaker in Housing
• Speaker 4Ohm 3W 40mm

Features:

• MAX98357A class D amplifier with I2S input
• Output power 2.5 W into 4 Ω or 1.8 W into 8 Ω (at 12 dB)
• Channel selectable via the resistor on SD: off, left, right or mixed, mixed from the factory (680 kΩ)
• SD to GND switches the amplifier off
• Gain via GAIN pin: 3, 6, 9, 12 or 15 dB, open 9 dB
• Speaker via PH2.0 or solder pads, castellated holes for SMT and pin header
• Sample rate 8 to 96 kHz

Application Examples:

• Music and voice output with ESP32
• Bluetooth speakers and internet radio
• Voice output for smart home devices and robots

Documentation:

• DFRobot Wiki DFR0954 with ESP32 examples
• Library DFRobot_MAX98357A (GitHub)
• Schematic (PDF)
• Datasheet (PDF)
• Dimension drawing (PDF)

Technical Data:

• Manufacturer: DFRobot
• Manufacturer SKU: DFR0954
• Chip: MAX98357A
• Operating voltage: 3.3 to 5 V DC
• Output power: 4 Ω 2.5 W, 8 Ω 1.8 W (at 12 dB)
• Output: single channel (mono)
• Interface: I2S
• Sample rate: 8 to 96 kHz
• Efficiency: 92 % (8 Ω, 12 dB)
• Switching frequency: 330 kHz
• Spread spectrum: ±12.5 kHz
• Pins: SPK+, SPK-, VCC, GND, NC, SD, GAIN, DIN, BCLK, LRC
• Operating temperature: -40 to 80 °C
• Dimensions: 18 × 18 × 7 mm
• Weight: 7 g

Scope of Delivery:

• 1× MAX98367 I2S Amplifier Module
• 2× pin header 1 × 6