{"product_id":"adafruit-stereo-2-8w-class-d-audio-amplifier-i2c-control-agc","title":"Adafruit Stereo 2.8W Class D Audio Amplifier - I2C Control AGC","description":"\u003cp\u003eA mini class D with AGC and I2C control? Yes please! Able to deliver 2 x 2.8W channels into 4 ohm impedance speakers (@ 10% THD) it has an i2c control interface as well as an AGC (automatic gain control) system to keep your audio from clipping or distorting.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003econtains a class D controller, able to run from 2.7V-5.5VDC.\u003c\/li\u003e\n\u003cli\u003eSince the amp is a class D, it's incredibly efficient (89% efficient when driving an 8Ω speaker at 1.5 Watt) - making it perfect for portable and battery-powered projects.\u003c\/li\u003e\n\u003cli\u003eOutput Power: 2.8W at 4Ω, 10% THD, 1.7W at 8Ω, 10% THD, with 5V Supply\u003c\/li\u003e\n\u003cli\u003ePSRR: 80 dB, 5ms startup time\u003c\/li\u003e\n\u003cli\u003eDesigned for use without an output filter, when wires are kept at under 2\"-4\" long\u003c\/li\u003e\n\u003cli\u003eI2C interface pins for setting gain, AGC configuration parameters, etc. See the tutorial for more details\u003c\/li\u003e\n\u003cli\u003eSelectable gain from -28dB to 30dB\u003c\/li\u003e\n\u003cli\u003eExcellent click-and-pop suppression\u003c\/li\u003e\n\u003cli\u003eThermal shutdown protection\u003c\/li\u003e\n\u003cli\u003eShutdown pin for power saving mode.\u003c\/li\u003e\n\u003cli\u003eLow current draw: 3.5mA quiescent and 0.2uA in shutdown mode\u003c\/li\u003e\n\u003cli\u003einputs 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.\u003c\/li\u003e\n\u003cli\u003eoutputs are \"Bridge Tied\" - that means they connect directly to the outputs, no connection to ground.\u003c\/li\u003e\n\u003cli\u003eThe output is a ~300KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAll the above means that you can't connect the output into another amplifier, it should drive the speakers directly.\u003c\/p\u003e\n\u003cp\u003eIf you don't want to use I2C to control it, it does start up on with 6dB gain by default and 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 \u0026amp; AGC amplification settings every time the amp is powered up.\u003c\/p\u003e\n\u003cp\u003eComes with a fully assembled and tested breakout board with 1.0uF input capacitors. We also include 3.5mm screw-terminal blocks so you can easily attach\/detach your speakers, and some header in case you want to plug it into a breadboard. \u003cb\u003eSpeakers are not included, use any 4 ohm or 8 ohm impedance speakers - \u003ca href=\"https:\/\/shop.pimoroni.com\/products\/3-speaker-4-3w\"\u003esomething like this, perhaps\u003c\/a\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/adafruit-tpa2016-2-8w-agc-stereo-audio-amplifier\"\u003e \u003cb\u003eAdafruit's awesome tutorial and Arduino library will let you set the AGC configuration (you can also just turn it off), max gain, and turn on\/off the left \u0026amp; right channels all over I2C! You will be ready to rock in 20 minutes! \u003c\/b\u003e\u003c\/a\u003e\u003ca href=\"http:\/\/learn.adafruit.com\/adafruit-tpa2016-2-8w-agc-stereo-audio-amplifier\"\u003e \u003c\/a\u003e\u003c\/p\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":549933533,"sku":"ADA1712","price":9.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/1712.jpg?v=1392719136","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-stereo-2-8w-class-d-audio-amplifier-i2c-control-agc","provider":"Pimoroni Ltd","version":"1.0","type":"link"}