SparkFun MAX98357A I2S Audio Breakout

This SparkFun breakout uses the MAX98357A to convert digital I2S audio (not to be confused with I2C) into an analogue signal and amplifies it with a class D amplifier to up to 3.2 W into 4 Ω. By default it runs in mono, the left and right channels are combined to drive one speaker. The gain can be set via the GAIN pin from +3 dB to +15 dB, the default is +9 dB.

Recommended Accessories:

• Speaker 4Ohm 3W 50mm
• 3W 8Ohm Speaker in Housing
• Pin header male 1 X 40 pole RM 2.54mm straight short pin

Features:

• Gain: GAIN open +9 dB, to GND +12 dB, via 100 kΩ to GND +15 dB, to VDD +6 dB, via 100 kΩ to VDD +3 dB
• For separate left and right speakers cut the mono jumper, channels are selected via solder jumpers
• SD low shuts the board down
• No MCLK required
• Click and pop reduction, short-circuit and thermal protection

Application Examples:

• Audio output with the ESP32, SparkFun example with GPIO22 to DIN, GPIO26 to BCLK and GPIO25 to LRCLK
• MP3 player with microSD card
• Voice output and signal tones
• Integration into Home Assistant with ESPHome

Documentation:

• ESPHome documentation: I²S Audio Speaker
• SparkFun Hookup Guide
• Schematic (PDF)

Technical Data:

• Manufacturer: SparkFun
• Manufacturer SKU: DEV-14809
• Chip: MAX98357A
• Supply voltage: 2.5 V to 5.5 V
• Output power: 3.2 W into 4 Ω at 5 V
• Sample rate: 8 kHz to 96 kHz
• Resolution: 16/32 bit
• Quiescent current: 2.4 mA
• Outputs: filterless, class D
• Connections: LRCLK, BCLK, DIN, GAIN, SD, GND, VDD 2.5-5.5V, speaker + and −
• Dimensions: 21 × 21 × 3 mm
• Weight: 2 g

Scope of Delivery:

• 1× SparkFun MAX98357A I2S Audio Breakout