Description
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 or any other microcontroller with I2S output! If you're looking for an easy and low cost way to get your digital sound files bumpin' then the Stereo MAX98357A I2S Amp Breakout is for you. It takes standard I2S digital stereo 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.
This Stereo MAX98357A takes all the audio goodness you know and doubles up on it. With an additional terminal block and MAX chip your audio projects get to be heard in stereo as it now has separate left and right channels.
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 stereo amplifier is surprisingly powerful - able to deliver 3.2 Watts of power into each 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 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 soldering the on-board jumper, the Gain pin can be set up to give 3dB, 6dB, 9dB, 12dB or 15dB.
Works great with Raspberry Pi, Arduino, ESP32 and any other microcontroller or microcomputer with I2S audio outputs
Specs:
- Output Power per channel: 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
- 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 pre-soldered terminal blocks, with a small piece of optional header. Some soldering is required to attach the header. Check out the tutorial for schematics, diagrams, examples and more!
Technical Details
Specifications:
- Single-Supply Operation (2.5V to 5.5V)
- 3.2W Output Power into 4Ω at 5V
- 2.4mA Quiescent Current
- 92% Efficiency (RL = 8Ω, P_OUT = 1W)
- 25μv RMS Output Noise (AV = 15dB)
- Low 0.015% THD+N at 1kHz
- No MCLK Required
- Sample Rates of 8kHz to 96kHz
- Supports Left, Right, or (Left/2 + Right/2) Output
- Sophisticated Edge Rate Control Enables Filterless Class D Outputs
- 77dB PSRR at 1kHz
- Low RF Susceptibility Rejects TDMA Noise from GSM Radios
- Extensive Click-and-Pop Reduction Circuitry
- Robust Short-Circuit and Thermal Protection
Product Dimensions: 25.5mm x 19.0mm x 11.8mm / 1.0" x 0.7" x 0.5"
Product Weight: 3.5g / 0.1oz
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