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The MAX98357 Audio Decoder Module is suitable for Raspberry Pi. Accepts digital audio through the I2S interface, converts it to an analog output signal, and amplifies it to allow direct speaker connection. MAX98357 Audio Decoder Module combines an I2S D / A converter with an audio amplifier on one board. The small stereo amplifier MAX98357 Audio Decoder Module is surprisingly powerful and delivers up to 3.2W on 4Ω impedance speakers. The class D MAX98357 Audio Decoder Module can be operated with a voltage of 2.7 V – 5.5 V. Due to the high efficiency of the amplifier, the MAX98357 Audio Decoder 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 + R) are mixed to form an output signal. The behavior can be changed using a resistor so that only L or R is output. The MAX98357 Audio Decoder Module is delivered fully assembled and tested. The delivery includes a pin header and a 2-pin terminal, which you can solder on demand.