This I2S digital amplifier based on the MAX98357 I2S Class D amplifier module works great with microcontrollers with I2S audio outputs like ESP32 and can be applied to projects like IoT nodes, smart home devices, Bluetooth audio players, and so on.

The module supports a 3.3V-5V power supply. And it can output over 2.5W of power when driven by 5V and a 4Ω speaker. Besides, it allows users to set different modes (off, left channel, right channel, and mixed) by changing the resistance on the SD port. The product defaults to mixed mode.
Featuring a small size, this I2S amplifier comes with stamp holes that enable it to be directly plugged into or mounted on a PCB and breadboard. Also, it is designed with PH2.0 and stamp holes for connecting speakers, flexible, and convenient to use.

MAX98357 I2S Amplifier Module

Features:

MAX98357 I2S digital Class D amplifier, power >2.5W
3.3V~5V voltage power supply
Switchable sound channel
Adjustable gain
Stamp holes design, support SMT and DIP
Two ways to connect a speaker: PH2.0 and stamp holes
APPLICATIONS
Bluetooth Audio Player
IoT Node Audio Player
Smart Home Voice Interaction
Robotic Device Audio Player

Specifications:

Module Parameters
MCU: MAX98357A
Operating Voltage: DC 3.3V~5V
Output Power: 8Ω 1.8W / 4Ω 2.5W (at 12db)
Output Channel: single channel
Communication Interface: I2S interface
Operating Temperature: -40℃ - ＋80℃
Storage Temperature: -40℃ - ＋80℃
Dimension (Without Packaging): 18mm × 18mm/ 0.059 × 0.059
Chip Audio-relevant Parameters
(VDD = 5V, VGND = 0V, GAIN_SLOT = VDD. BCLK = 3.072MHz, LRCLK = 48kHz, speaker loads (ZSPK) connected between OUTP and OUTN, ZSPK = J, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2)
Sample Rate: 8kHz~96kHz
THD:
0.02% (f = 1kHz, POUT = 1W, TA = +25NC, ZSPK = 4I + 33FH, TQFN)
0.013% (f = 1kHz, POUT = 0.5W, TA = +25NC, ZSPK = 8I + 68FH)
Dynamic Range: 105DB (A-weighted, VRMS = 2.54V, 24- or 32-bit data)
Output Noise: 25FVRMS (A-weighted, 24- or 32-bit data (Note 4))
Gain (relative to the reference level of 2.1dBV):
GAIN_SLOT = GND through 100kΩ: Min 14.4dB, Typical 15dB, Max 15.6dB
GAIN_SLOT = GND: Min 11.4dB, Typical 12dB, Max 12.6dB
GAIN_SLOT = unconnected: Min 8.4dB, Typical 9dB, Max 9.6dB
GAIN_SLOT = VDD: Min 5.4dB, Typical 6dB, Max 6.6dB
GAIN_SLOT = VDD through 100kΩ: Min 2.4dB, Typical 3dB, Max 3.6dB
Efficiency: 92% (ZSPK = 8I + 68FH, THD+N = 10%, f = 1kHz, gain = 12dB)
DAC Gain Error: 1%
Frequency Response: ±0.2dB
Class D Switching Frequency: 330kHz
Spread Spectrum Bandwidth: ±12.5kHz