MAX98357 I2S 3W Class D Amplifier Interface Audio Decoder Module Filterless Board

The MAX98357 I2S 3W Class D Amplifier Interface Audio Decoder Module Filterless Board is suitable for the Raspberry Pi. Accepts digital audio through the I2S interface, converts it to an analog output signal, and amplifies it to allow direct speaker connection. It combines an I2S D/A converter with an audio amplifier on one board.

The small stereo amplifier module MAX98357a is surprisingly powerful and delivers up to 3.2W on 4 impedance speakers. The class D amplifier can be operated with a voltage of 2.7 V–5.5 V. Due to the high efficiency of the amplifier, the module is particularly suitable for mobile and battery-powered projects.

The I2S audio input supports 3.3V and 5V levels. The gain can be set to the following values ​​using the gain input: 3dB, 6dB, 9dB, 12dB and 15dB.

By default, the stereo signals (L and R) are mixed to form an output signal. The behavior can be changed using a resistor so that only L or R is output.

Specifications:

• 3.2 W output at 10% THD, 4 Ω impedance of the speaker and 5 V power supply
• 2.7–5.5 V operating voltage
• 77 dB PSRR at 1 kHz
• Selectable gains: 3 dB, 6 dB, 9 dB, 12 dB, 15 dB

Package Includes:

• 1 x MAX98357 I2S 3W Class D Amplifier Module