1-20pcs MAX98357A I2S Class D Audio Amplifier – 3W Digital Power Module for DIY Speakers & Smart Voice Systems
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$25.53Sold by BILLIONS BIRDS
Description
Output power: 4h 3.2W, 10pc THD, 8h 1.8W, 10pc THD, with 5V power supply
PSRR:77 decibels, typical @1 KHZ
The sampling rate of I2s ranges from 8kHz to 96kHz
You don't need MCLK
Click + to pop down Reduce
Five pin optional gain: 3db, 6db, 9db, 12db, 15db
Excellent click and pop suppression
Hot shutdown protection
As an assembled and tested tap board, with a small optional piece of head and a 3.5mm patch board. If you need to connect the head to the terminal, do some welding.
It takes the standard I2s digital audio input and not only decodes it into an analog signal, but also amplifies it directly into a speaker. Perfect for adding compact amplified sound, it takes 2 breaks (I2sDAC+AMP) and combines into one.
I2s (not to be confused with I2c), in the digital Sound Protocol used to deliver audio data on a circuit board. Many high-end chips and processors manage all audio in a digital I2s format. Then, in order to input or output data, three or four pins (data input, data output, bit clock, and left and right channel selection) are used. Usually, for audio devices, there is a DAC chip that takes the I2s and converts it into an analog signal that can drive the headset.
This small mono amplifier is surprisingly powerful - capable of delivering 3.2 watts of power to a 4 ohm impedance speaker (5 volts power 10%THD). Inside the microchip is a D-level controller capable of operating between 2.7V and 5.5Vdc. Because AMP is class D, it is highly efficient and perfect for portable and battery-powered projects. It has built-in thermal protection and overcurrent protection, but we can barely tell it's getting hotter.
The audio input is I2s standard and can use 3.3V or 5V logic data. The outputs are "bridged" - this means that they are directly connected to the output, rather than grounded. The output is a ~300kHz square-wave pulse-width modulation, which is then "averaged out" by the speaker coil - no high frequencies are heard. All of this means that you can't connect the output to another amplifier, it should drive the speakers directly.
There is a gain pin that can be manipulated to change the gain. By default, the amplifier will give you a gain of 9 dB. Gain pins can be set to 3db, 6db, 9db, 12db, or 15db by directly connecting a pull-up resistor or pull-down resistor or wiring.
The Shutdown/Mode pins can be used to put the chip in the shutdown state or to set which I2s audio channel is connected to the speaker through the pipe. By default, the amplifier will output (L+R) /2 stereo mix to mono output. By adding a resistor, you can change it to output just to the left or right.
Suitable for Raspberry Pi, Arduino Zero, and any other microcontroller or microcomputer with I2s audio output.
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