20 W per channel stereo Class D amplifier breakout based on the MAX9744, powered 5–12 VDC via DC jack, with 3.5 mm stereo line input. Supports analog volume via 1 kΩ pot (included) or 64-step I2C digital volume control. Up to 93% efficiency.
5-12VDC board power after polarity protection, from terminal block/DC jack; source says it can power other projects that can handle 5-12VDC input.
Power ground / digital ground for the amplifier board.
Analogue reference ground, described by Adafruit as the quieter ground for audio signal referencing.
Right-channel audio input; duplicate of the right-channel audio input terminal block.
Left-channel audio input; duplicate of the left-channel audio input terminal block.
3.5mm/terminal audio input channel; Adafruit correction states the top breakout pin is LEFT and the middle pin is GND.
3.5mm/terminal audio input channel; Adafruit correction states the bottom breakout pin is RIGHT and the middle pin is GND.
I2C digital signal data when using digital volume-control mode.
I2C digital signal clock when using digital volume-control mode.
I2C logic voltage reference for digital mode; connect to 3V or 5V matching the microcontroller logic.
Digital shutdown pin; connect to ground to turn off the entire chip and enter low-power mode.
Digital mute pin; connect to ground to turn off only the audio output stages.
PWM-generator sync output, about 1.4MHz according to Adafruit.
Sync input for an external PWM clock; source says keep it above 800kHz.
I2C address select pin 1.
I2C address select pin 2.
Left speaker output terminal pair for the class-D amplifier channel.
Right speaker output terminal pair for the class-D amplifier channel.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VDD | Power | 5-12VDC board power after polarity protection, from terminal block/DC jack; source says it can power other projects that can handle 5-12VDC input. | 5-12VDC | |
| GND | Ground | Power ground / digital ground for the amplifier board. | 0V | |
| AGND | Ground | Analogue reference ground, described by Adafruit as the quieter ground for audio signal referencing. | 0V | |
| RIN | Signal | Right-channel audio input; duplicate of the right-channel audio input terminal block. | ||
| LIN | Signal | Left-channel audio input; duplicate of the left-channel audio input terminal block. | ||
| LEFT audio terminal | top audio breakout pin | Signal | 3.5mm/terminal audio input channel; Adafruit correction states the top breakout pin is LEFT and the middle pin is GND. | |
| RIGHT audio terminal | bottom audio breakout pin | Signal | 3.5mm/terminal audio input channel; Adafruit correction states the bottom breakout pin is RIGHT and the middle pin is GND. | |
| SDA | I2C | I2C digital signal data when using digital volume-control mode. | ||
| SCL | I2C | I2C digital signal clock when using digital volume-control mode. | ||
| Vi2c | Power | I2C logic voltage reference for digital mode; connect to 3V or 5V matching the microcontroller logic. | 3V or 5V logic reference | |
| SHDN | Control | Digital shutdown pin; connect to ground to turn off the entire chip and enter low-power mode. | ||
| MUTE | Control | Digital mute pin; connect to ground to turn off only the audio output stages. | ||
| SYNCO | Signal | PWM-generator sync output, about 1.4MHz according to Adafruit. | ||
| SYNC | Signal | Sync input for an external PWM clock; source says keep it above 800kHz. | ||
| AD1 | Control | I2C address select pin 1. | ||
| AD2 | Control | I2C address select pin 2. | ||
| L+L- | Unknown | Left speaker output terminal pair for the class-D amplifier channel. | ||
| R+R- | Unknown | Right speaker output terminal pair for the class-D amplifier channel. |
5-12VDC board power after polarity protection, from terminal block/DC jack; source says it can power other projects that can handle 5-12VDC input.
Power ground / digital ground for the amplifier board.
Analogue reference ground, described by Adafruit as the quieter ground for audio signal referencing.
Right-channel audio input; duplicate of the right-channel audio input terminal block.
Left-channel audio input; duplicate of the left-channel audio input terminal block.
3.5mm/terminal audio input channel; Adafruit correction states the top breakout pin is LEFT and the middle pin is GND.
3.5mm/terminal audio input channel; Adafruit correction states the bottom breakout pin is RIGHT and the middle pin is GND.
I2C digital signal data when using digital volume-control mode.
I2C digital signal clock when using digital volume-control mode.
I2C logic voltage reference for digital mode; connect to 3V or 5V matching the microcontroller logic.
Digital shutdown pin; connect to ground to turn off the entire chip and enter low-power mode.
Digital mute pin; connect to ground to turn off only the audio output stages.
PWM-generator sync output, about 1.4MHz according to Adafruit.
Sync input for an external PWM clock; source says keep it above 800kHz.
I2C address select pin 1.
I2C address select pin 2.
Left speaker output terminal pair for the class-D amplifier channel.
Right speaker output terminal pair for the class-D amplifier channel.
I2S · I2C · Analog · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VDD, Vi2c, GND, AGND, RIN, LIN, LEFT audio terminal, RIGHT audio terminal. Schematik maps them to your board in the app.
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