SSM2302

Rev. 0 | Page 14 of 20

EVALUATION BOARD INFORMATION

INTRODUCTION

The SSM2302 audio power amplifier is a complete low power,

Class-D, stereo audio amplifier capable of delivering 1.4 W/channel

into 8 Ω load. In addition to the minimal parts required for the

application circuit, measurement filters are provided on the

evaluation board so that conventional audio measurements can

be made without additional components.

This section provides an overview of Analog Devices SSM2302

evaluation board. It includes a brief description of the board as

well as a list of the board specifications.

Table 5. SSM2302 Evaluation Board Specifications

Parameter

Specification

2.5 V to 5.0 V

Power Supply Current Rating

1.5 A

1.4 W

Minimum Load Impedance

8 Ω

OPERATION

Use the following steps when operating the SSM2302

evaluation board.

Power and Ground

1.

Set the power supply voltage between 2.5 V and 5.0 V. When

connecting the power supply to the SSM2302 evaluation

board, make sure to attach the ground connection to the

GND header pin first and then connect the positive supply

to the VDD header pin.

Inputs and Outputs

1.

Ensure that the audio source is set to the minimum level.

2.

Connect the audio source to Inputs INL± and INR±.

3.

Connect the speakers to Outputs OUTL± and OUTR±.

Gain Control

The gain select header controls the gain setting of the SSM2302.

1.

Select jumper to LG for 6 dB gain.

2.

Select jumper to HG for 12 dB gain.

External Gain Settings

It is possible to adjust the SSM2302 gain using external resistors

at the input. To set a gain lower than 12 dB refer to Figure 22

and Figure 23 on the product data sheet for proper circuit con-

figuration. For external gain configuration from a fixed 12 dB

gain, use the following formula:

External Gain Settings = 20 log[4/(1 + R/150 kΩ)]

To set a gain lower than 6 dB refer to Figure 24 and Figure 25

on the product data sheet for proper circuit configuration. For

external gain configuration from a fixed 6 dB gain, use the

following formula:

External Gain Settings = 20 log[2/(1 + R/150 kΩ)]

Shutdown Control

The shutdown select header controls the shutdown function of

the SSM2302. The shutdown pin on the SSM2302 is active low,

meaning that a low voltage (GND) on this pin places the SSM2302

into shutdown mode.

1.

2.

Select jumper to 2-3 position. Shutdown pulled to GND.

Input Configurations

1.

For differential input configuration with input capacitors

do not place a jumper on JP8, JP9, JP10, and JP11.

2.

For differential input configuration without input capacitors

place a jumper on JP8, JP9, JP10, and JP11.