Adafruit Mono 2.5W Class D Audio Amplifier
- PAM8302
PRODUCT ID: 2130
DESCRIPTION
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This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5
Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D
controller, able to run from 2.0V-5.5VDC. Since the amp is a class D, its very
efficient (over 90% efficient when driving an 8Ω speaker at over half a Watt) 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. There's even a
volume trim pot so you can adjust the volume on the board down from the default
24dB gain. This board is a welcome upgrade to basic "LM386" amps!
The A+ and A- inputs of the amplifier go through 1.0uF capacitors, so they are
fully 'differential' - if you don't have differential outputs, simply tie the Audio- pin
to ground. The output is "Bridge Tied" - that means the output pins connect
directly to the speaker pins, no connection to ground. The output is a high
frequency 250KHz 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 and tested breakout board. We also include header
to plug it into a breadboard and a 3.5mm screw-terminal blocks so you can easily
attach/detach your speaker. You will be ready to rock in 15 minutes! Speaker is not
included, use any 4 ohm or greater impedance speaker.
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Output Power: 2.5W at 4Ω, 10% THD, 1.5W at 8Ω, 10% THD, with 5.5V Supply
50dB PSRR at 1KHz
Filterless design, with ferrite bead + capacitors on output.
Fixed 24dB gain, onboard trim potentiometer for adjusting input volume.
Thermal and short-circuit/over-current protection
Low current draw: 4mA quiescent and 1uA in shutdown mode
http://www.adafruit.com/product/2130
11/13/2015
Technical Details
PAM8302A datasheet
Dimensions (without 0.1" header):
15mm x 24mm x 2mm / 0.6" x 0.9" x 0.08"
Weight: 1.4g
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