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Listen to this good news - we now have an all in one digital audio amp
breakout board that works incredibly well with the Raspberry Pi!

If you're looking for an easy and low cost way to get you 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. Perfect for
adding compact amplified sound, 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 it to analog that
can drive a headphone.

This small mono amplifier is surprisingly powerful - able to deliver
3.2 Watts of power into a 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 the amp 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 I2S standard, 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. All the above means that you can't connect
the output into another amplifier, it should drive the speakers

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 up 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 to be just left or just right output

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


* Output Power: 3.2W at 4, 10% THD, 1.8W at 8, 10% THD, with 5V
* 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

Comes as an assembled and tested breakout board, with a small piece of
optional header and 3.5mm terminal block. Some soldering is required
to attach the header and terminal block if those are desired.

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

Product Weight: 1.2g / 0.0oz


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General information

Manufacturer Adafruit Industries
Product type Elektronikmodul
Item number5998646
Manufacturer no.ada-3006

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Warranty & right to return

Warranty 24 month Bring-in

Limited right of return

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Adafruit Industries Adafruit I2S 3W Class D Amplifier Breakout MAX98357A Adafruit Industries Adafruit I2S 3W Class D Amplifier Breakout MAX98357A