DESCRIPTION
The I2S 3W Class D Amplifier Breakout – MAX98357A is an all-in-one digital audio amp breakout board that works incredibly well with the Raspberry Pi!
This is an easy and low cost way to push your digital sound files around. It takes standard I2S digital audio input and, not only decodes it into analogue 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) is a digital sound protocol that is used on circuit boards to pass audio data. 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 analogue 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” – which means they connect directly to the outputs, with 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 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 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.
FEATURES
- Output Power: 3.2W at 4, 10% THD, 1.8W at 8, 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
- Dimensions: 19.4mm x 17.8mm x 3.0mm / 0.8″ x 0.7″ x 0.1″
- Weight: 1.2g/0.0oz
RESOURCES
- MAX98357 Datasheet
- MAX98357 I2S Class-D Mono Amp product information
Fast Shipping and Professional Packing
Due to our long-term partnership in a long-standing partnership with UPS, FedEx, DHL and many other top global carriers we can provide various shipping options. Our warehouse staff will package all goods to our exacting specifications. Your items will undergo an exhaustive inspection and properly secured before they are shipped. Each day, we ship to thousands of customers in different countries. Our dedication to becoming the biggest online retailer around the globe is evident by this. The warehouses and centers for distribution are situated in Europe and the USA.
Note: Orders containing multiple items will have a separate processing period for each item.
Before shipping, all ordered items will be thoroughly examined. The majority of orders are delivered within 48 hrs. It is expected that delivery will take between 3 and seven days.
Returns
We don't manage the stock in our factory and warehouse. The actual inventory may fluctuate at any time. It is possible that you will not receive your order after it has been placed.
Our policy lasts 30 days. If you have passed 30 days in the past since you purchased, unfortunately we can't offer you a return or exchange.
The item cannot be used and in the original packaging. You must have the item in its original packaging.
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