The SHARC Audio Module A²B Class-D Amplifier Module is an A2B connected board that contains two Class-D SSM3582 amplifier ICs, providing 4 channels of audio output.

The A²B Class-D Amplifier Module

Block Diagram of the A²B Class-D Amplifier Module

The A²B bus uses crossover cables to connect nodes to each other. P4 connects to upstream towards the Master Node in the network and P5 connects downstream to the next slave in the network.

The A²B Class-D Amplifier Module uses the AD2428W IC.

There are two ADI SSM3582 Class-D amplifiers on the A²B Class-D Amplifier Module. Each is two channels.

At 16V, the max power per channel is ~24w of power.

P11 AMP1 Left Channel Output

P12 AMP1 Right Channel Output/MONO

P13 AMP2 Left Channel Output

P14 AMP2 Right Channel Output/MONO

Populate JP6 & JP7 to configure AMP1 into MONO Output on P12. Populate JP8 & JP9 to configure AMP2 into MONO Output on P14.

The USBi Connector on the SHARC Audio Module allows for the use of the USBi adapter for SigmaStudio and bare metal programming.

The A²B Class-D Amplifier Module is designed to run off a 12v to 16v supply. A 12v 2A DC power supply is included in the kit. The barrel connector on the A²B Class-D Amplifier Module can handle up to 3A current.

P10 is a power supply input jack to connect up to 16v @ 8A MAX. There is an 8A fuse on the Positive input of the P10 connector.

Two GPIO pushbuttons are provided on the A²B Class-D Amplifier Module. They are connected as follows:

• PB1 is connected to IO1 on AD2428W
• PB2 is connected to IO2 on AD2428W

There are two GPIO-controlled LEDs on the A²B Class-D Amplifier Module. They are connected as follows:

• LED1 is connected to IO0 on the AD2428W
• LED2 is connected to IO7 on the AD2428W

JP5 PDM MIC

P2 Buffered TDM Signals

P15 Unbuffered TDM Signals

The A²B Class-D Amplifier Module has a TWI 256k EEPROM for configuration data. The EEPROM used is the 24FC256I/MS.