Adafruit Stereo 2.8W Class D Audio Amplifier - I2C Control AGC - TPA2016

This incredibly small stereo amplifier is surprisingly powerful, delivering 2 x 2.8W channels into 4 ohm impedance speakers at 10% THD. It features an I2C control interface and an AGC (automatic gain control) system to prevent audio clipping or distortion.

The amplifier powers up with a default 6dB gain and AGC setup, ideal for most music. Configuring it with a microcontroller is advisable due to its powerful capabilities, though settings are not retained after power-off.

Inside its miniature form, the class D amplifier runs efficiently from 2.7V to 5.5VDC, making it suitable for portable and battery-powered projects, operating at 89% efficiency with an 8Ω speaker at 1.5 Watts.

With thermal and over-current protection, its design upgrades basic 'LM386' amps, using fully differential inputs via 1.0uF capacitors. The 'Bridge Tied' output connects directly to speakers, outputting a ~300KHz PWM signal.

The amplifier comes fully assembled and tested, including 3.5mm screw-terminal blocks for easy speaker attachment and headers for breadboard connection. Compatible with 4 or 8 ohm speakers, though they are not included.

Use the accompanying tutorial and Arduino library to adjust AGC settings and channel controls via I2C, getting started in just 20 minutes. Note that terminal blocks may vary in color.