Adafruit I2S 3W Class D Amplifier Breakout - MAX98357A

Adafruit I2S 3W Class D Amplifier Breakout - MAX98357A

Adafruit I2S 3W Class D Amplifier Breakout - MAX98357A

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Description

Listen to this good news - we now have an all in one digital audio breakout board that works incredibly well with the Raspberry Pi! If you're looking for an easy and cheap way to get digital sound files bumpin 'then the MAX08357 I2S Amp Breakout is for you. It takes standard I2S digital audio input and, not only decodes it into analog, but also amplifies it directly into a speaker. It takes 2 breakouts (I2S DAC + Amp) and combines them into one.

I2S (not to be confused with I2C) in a digital sound protocol that is used on circuit boards to pass audio data around. Many high end chips and processors manage all of the audio in digital I2S format. Then, to input or output data, three or four pins are used (data in, data out, bit clock and left-right channel select). Usually, for audio devices, there's a DAC chip that will take I2S in and convert to analog that can drive to headphone.

3.2 Watts of power into 4 ohm impedance speaker (5V power @ 10% THD) Inside the miniature chip is a class D controller, able to run from 2.7V-5.5VDC. Since it is a class D, it's incredibly efficient - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot.

The audio input is standard I2S, you can use 3.3V or 5V logic data. The outputs are “Bridge Tied” - that means they connect directly to the outputs, no connection to ground. The output is a ~ 300KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. It should drive the speakers directly.

There's a Gain pin that can be manipulated to change the gain. By default, the amp will give you 9dB of gain. By connecting a pullup or pull down resistor, or wiring directly, the Gain pin can be set to give 3dB, 6dB, 9dB, 12dB or 15dB.

The ShutDown / Mode pin can be used to put the chip in shutdown or set up which I2S audio channel is piped to the speaker. By default, the amp will output (L + R) / 2 stereo mix into mono out. By adding a resistor, you can change it just left or just right output

Works great with Raspberry Pi, Arduino Zero, and any other microcontroller or microcomputer with I2S audio outputs

Specs:

  • Output Power: 3.2W at 4Ω, 10% THD, 1.8W at 8Ω, 10% THD, with 5V supply
  • PSRR: 77 dB typ @ 1KHz
  • I2S sample rates from 8kHz to 96kHz
  • No MCLK required
  • Click + Pop reduction
  • Five pin-selectable gains: 3dB, 6dB, 9dB, 12dB, 15dB
  • Excellent click-and-pop suppression
  • Thermal shutdown protection

Product Dimensions: 19.4mm x 17.8mm x 3.0mm / 0.8 ″ x 0.7 ″ x 0.1 ″

Product Weight: 1.2g / 0.0oz

Additional information

Weight 0.83 lbs
Dimensions 5 × 1 × 3 cm
Brand

Adafruit

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