• Contains a class D controller, able to run from 2.7V-5.5VDC.• Since the amp is a class D, it's incredibly efficient (89% efficient when driving an 8O speaker at 1.5 Watt)
- making it perfect for portable & battery-powered projects• Output Power: 2.8W at 4O, 10% THD, 1.7W at 8O, 10% THD, with 5V Supply•PSRR: 80 d B, 5ms start-up time• Designed for use without an output filter, when wires are kept at under 2""-4"" long•I2C interface pins for setting gain, AGC configuration parameters, etc. See the tutorial for more details• Selectable gain from -28d B to 30d B• Excellent click-&-pop suppression• Thermal shutdown protection• Shutdown pin for power saving mode• Low current draw: 3.5m A quiescent & 0.2u A in shutdown mode• Inputs of the amplifier go through 1.0u F capacitors, so they are fully 'differential'
- if you don't have differential outputs, simply tie the R- & L- to ground• Outputs are "" Bridge Tied""
- that means they connect directly to the outputs, no connection to ground• The output is a ~300 K Hz square wave PWM that is then 'averaged out' by the speaker coil
- the high frequencies are not heard A mini class D with AGC & I2C control? Yes please! This incredibly small stereo amplifier is surprisingly powerful. It is able to deliver 2 x 2.8W channels into 4 ohm impedance speakers (@ 10% THD) & it has a i 2c control interface as well as an AGC (automatic gain control) system to keep your audio from clipping or distorting. If you don't want to use I2C to control it, it does start up on with 6d B gain by default & the AGC set up for most music playing. We do suggest using it with a microcontroller to configure it, however, since its quite powerful. Settings are not stored in the chip, so you'll need to adjust any gain & AGC amplification settings every time the amp is powered up. 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 (89% efficient when driving an 8O speaker at 1.5 Watt)
- making it perfect for portable & battery-powered projects. It has built in thermal & over-current protection but we could barely tell if it got hot. This board is a welcome upgrade to basic "LM386" amps! The inputs of the amplifier go through 1.0u F capacitors, so they are fully 'differential'
- if you don't have differential outputs, simply tie the R- & L- to ground. The outputs are " Bridge Tied"
- that means they connect directly to the outputs, no connection to ground. The output is a ~300 K Hz 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. Comes with a fully assembled & tested breakout board with 1.0u F input capacitors. We also include 3.5mm screw-terminal blocks so you can easily attach/detach your speakers, & some header in case you want to plug it into a breadboard. Adafruit's awesome tutorial & Arduino library will let you set the AGC configuration (you can also just turn it off), max gain, & turn on/off the left & right channels all over I2C! You will be ready to rock in 20 minutes!