Information

1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

PmodAMP3™ Reference Manual

Revised April 15, 2016

This manual applies to the PmodAMP3 rev. A

DOC#: 502-270

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 3

Overview

The Digilent PmodAMP3 features an Analog Devices® SSM2518 2 watt Class-D Audio Power Amplifier. The module

enables the use of I²S audio protocol or TDM to produce stereo audio at various sampling frequencies. Users may

configure the digital volume and dynamic range control via an I²C interface. Additionally, the PmodAMP3 may be

used in a stand-alone mode that does not require the use of the I²C interface.

1 Functional Description

The PmodAMP3 utilizes Analog Devices SSM2518 to reproduce digitally fed audio signals in separate left and right

headphone jacks. The separation of the jacks enables better audio signal isolation.

2 Interfacing with the Pmod

The PmodAMP3 communicates with the host board via the I²C protocol. Users may operate the PmodAMP3 in

either an I²C programmable mode or a simple stand-alone mode. The stand-alone mode is the default setting and

can be activated by removing the shorting block on jumper JP5. When the stand-alone mode is active, jumpers JP3,

JP4, and JP6 allow a simple hardware configuration of the amplifier.

Within the stand-alone mode jumper JP3 configuration determines whether to use Standard or Left Justified I²S

protocol. Jumper JP4 determines if the MCLK input is 256 or 384 times the audio sampling frequency Fs. The

jumper JP6 configures the amplifier to output at either 0dB or +12dB gain.

The PmodAMP3.

 Audio amplifier with left and right channel

separation

 Stereo output via two standard 1/8“ (0.32

cm) mono speaker jacks

 Supports common I²S audio formats

 Digitally configurable volume control for

each channel

 Dynamic range control

 Stand-alone mode for systems without I²C

interface

 Small PCB size for flexible designs 1.5” ×

0.8“ (3.8 cm × 2.0 cm)

 12-pin Pmod port with I²C interface

Features include:

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300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com PmodAMP3™ Reference Manual Revised April 15, 2016 This manual applies to the PmodAMP3 rev. A Overview The Digilent PmodAMP3 features an Analog Devices® SSM2518 2 watt Class-D Audio Power Amplifier. The module enables the use of I²S audio protocol or TDM to produce stereo audio at various sampling frequencies. Users may configure the digital volume and dynamic range control via an I²C interface.
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PmodAMP3™ Reference Manual If JP5 is loaded, I²C is enabled so that the on-board chip can be configured. Consequently, the shorting blocks on both JP3 and JP4 must be removed so that the SCL and SDA lines are pulled to a logic high voltage state. JP6 sets the I²C address of the Pmod; both addresses are valid, but a user may want to use one particular address if another I²C device on the bus is using the other address.
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PmodAMP3™ Reference Manual Pin 1 2 3 4 5 6 7 8 9 10 11 12 Table 2. Header J1 pinout table. Figure 2. PmodAMP3 block diagram.