Datasheet

Spread-Spectrum Modulation and Active Emissions Limiting

Differential Inputs

Five pin-selectable gains: 6dB, 9dB, 12dB, 15dB and 18dB. Select with a jumper or by

setting the G and G' breakout pins (see schematic for breakout board showing gain

pin settings (http://adafru.it/aWT) for details)

Excellent click-and-pop suppression

Thermal and short-circuit/over-current protection

Low current draw: 2mA quiescent and 10uA in shutdown mode

What is a Class D Amplifier?

A Class D Amplifier uses PWM to generate high-frequency square waves with a duty-cycle

proportional to the voltage level of the input audio signal. By minimizing the transition time

between fully on and fully off, the MOSFET drivers are able to operate at a very high

efficiency. Class D amplifiers such as this one typically operate at over 90% efficiency,

compared to efficiencies of 50% or less for typical class AB amplifiers.

The high frequency square-wave component of the output signal is filtered by the

inductance of the speaker voice coil, leaving only the amplified audio signal.

Other Audio amps available at Adafruit

We have a few choices of audio amplifiers, here's how you can compare them

MAX98306 (http://adafru.it/987) - This class D audio amplifier has selectable gains of

6dB, 9dB, 12dB, 15dB and 18dB that you can choose with a jumper. It can do up to

3.7W into 3Ω, 2.8W into 4Ω and 1.7W into 8Ω. However, you cannot shut down each

speaker separately. Its a good choice where you don't mind setting the gain with a

jumper and if you do not need to ever turn off only one audio channel and you do not

need more than 18dB. Its an excellent amplifier that can driver down to 3Ω speakers

Like the TS2012, it has differential inputs, bridge tied outputs, and can run from 2.7V

to 5.5V

TS2012 (http://adafru.it/1552) - This class D audio amplifier has selectable gains of

6dB, 12dB, 18dB and 24dB that you can choose with a jumper (the MAX98306 goes

up to 18dB only). It can do up to 2.8W into 4Ω and 1.7W into 8Ω. It cannot drive 3Ω.