The incredibly tiny MAX98306 Amplifier Chip is surprising powerful! Being so small, Adafruit has kindly placed it on a breakout board and made it a lot more accessible. The board will deliver 2 x 3.7W channels into 3 ohm impedance speakers. Inside the chip is a class D controller that can run on anything between 2.7VDC and 5.5VDC. It also has built in thermal and over-current protection. The amp is over 90% efficient when driving an 8Ω speaker at over a Watt which makes it perfect for portable and battery-powered projects.
The inputs of the amplifier go through 1.0uF capacitors, so they are fully ‘differential’ – if you don’t have differential outputs, simply tie the “R-“ and “L-“ to ground. The outputs are “Bridge Tied” – that means they connect directly to the outputs, no connection to ground. The output is a 360KHz 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.
- Output Power: 3.7W at 3Ω, 10% THD, 1.7W at 8Ω, 10% THD, with 5V Supply
- High 83dB PSRR at 217Hz
- Five pin-selectable gains: 6dB, 9dB, 12dB, 15dB and 18dB
- Thermal and short-circuit/over-current protection
- Passes EMI limit unfiltered with up to 12 inches (30 cm) of speaker cable
- Spread-Spectrum Modulation and Active Emissions Limiting
- Excellent click-and-pop suppression
- Low current draw: 2mA quiescent and 10uA in shutdown mode
Adafruit MAX98306 Breakout: https://learn.adafruit.com/stereo-3-7w-class-d-audio-amplifier
This product has a 30 Day Warranty from the date of delivery. The item must not be modified, abused, incorrectly hooked up, or used for purposes outside the original scope of design.
This product is returnable Within 14 Days of delivery for a store credit. Item must be unopened, unused, and in re-saleable condition.
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