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MAX98357A I2S 3W Class D Audio Amplifier

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John O'Sullivan edited this page Apr 5, 2026 · 2 revisions

Module DAC Decoder

  • High Quality Max98357 Max98357a I2s 3w Class D Amplifier Breakout Interface I2s Dac Decoder For AudioHigh Quality MAX98357 MAX98357A I2S 3W Class D Amplifier:Utilizes the high-quality MAX98357 MAX98357A I2S chipset for superior audio output.
  • I2S DAC Decoder for Audio:Features an I2S DAC decoder for crystal-clear audio reproduction.
  • 3W Class D Amplifier:Boasts a robust 3W Class D amplifier for powerful audio output.
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Pinouts

I2S

Three pins are used to receive audio data. These can be 3.3-5V logic

  • LRC (Left/Right Clock) - this is the pin that tells the amplifier when the data is for the left channel and when its for the right channel
  • BCLK (Bit Clock) - This is the pin that tells the amplifier when to read data on the data pin.
  • DIN (Data In) - This is the pin that has the actual data coming in, both left and right data are sent on this pin, the LRC pin indicates when left or right is being transmitted.

Gain

You can have a gain of 3dB, 6dB, 9dB, 12dB or 15dB.

  • 15dB if a 100K resistor is connected between GAIN and GND
  • 12dB if GAIN is connected directly to GND
  • 9dB if GAIN is not connected to anything (this is the default)
  • 6dB if GAIN is connected directly to Vin
  • 3dB if a 100K resistor is connected between GAIN and Vin

SD / MODE

This pin is used for shutdown mode but is also used for setting which channel is output. It's a little confusing but essentially:

  • If SD is connected to ground directly (voltage is under 0.16V) then the amp is shut down
  • If the voltage on SD is between 0.16V and 0.77V then the output is (Left + Right)/2, that is the stereo average.
  • If the voltage on SD is between 0.77V and 1.4V then the output is just the Right channel
  • If the voltage on SD is higher than 1.4V then the output is the Left channel.

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