PMODAMP2 [ETC]

The PmodAMP2 amplifies low power audio signals to drive a monophonic output.; 该PmodAMP2放大的低功耗音频信号，以驱动一个单声道输出。


型号：	PMODAMP2
厂家：	ETC
描述：	The PmodAMP2 amplifies low power audio signals to drive a monophonic output. 该PmodAMP2放大的低功耗音频信号，以驱动一个单声道输出。驱动
文件：	总2页 (文件大小：502K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PmodAMP2™

Reference Manual

Revision: August 2, 2012

1300 NE Henley Court, Suite 3

Pullman, WA 99163

(509) 334 6306 Voice | (509) 334 6300 Fax

Note: This document applies to REV B of the board.

Overview

The PmodAMP2 amplifies low power audio

signals to drive a monophonic output. The

module features a digital gain select that

allows output at 6 dB and 12 dB with pop-and-

click suppression. A Digilent 6-pin connector

provides the audio input to the module and a

1/8-inch mono jack supplies the speaker

output.

For customer convenience, Digilent has an

inexpensive speaker and enclosure available

for sale that is suitable for use with the

PmodAMP2. Also, unlike most Digilent Pmod

modules that accept only digital inputs, the

PmodAMP2 accepts analog inputs and pulse

width modulated digital inputs.

Features Include:

•

Analog Devices SSM2377: Filterless,

High Efficiency, Mono 2.5 Watt Class-D

Audio Amplifier

Inputs and Outputs (I/O)

•

Digital gain select

Pop –and-click suppression

Micropower shutdown mode

1/8-inch mono speaker jack

A 6-pin header for input

The PmodAMP2 accepts either digital or

analog inputs at a voltage range of 0-Vcc.

Typically a Digilent system board supplies

power to the module at 3.3V, though the

maximum supply voltage is 5.0V. The

connector J1 provides the audio input, gain

select, shutdown select, and power. (See

figure 1)

2.5V – 5V operating voltage

Figure 1

There are several suitable inputs for the

PmodAMP2. The typical input is a pulse width

modulated (PWM) signal produced by a digital

output from a Digilent programmable logic

system board or microcontroller board. The low

pass filter on the input acts as a reconstruction

filter to convert the PWM digital signal into an

analog voltage on the amplifier input.

The PmodAMP2 also accepts analog inputs

with an input voltage range of 0-Vcc. These

inputs will often be from an analog to digital

converter module, like the Digilent PmodDA1

or PmodDA2. The output of a digital to analog

Doc: 502-233

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PmodBT2™ Reference Manual

converter module will normally have a voltage

range of 0-3.3V and should have a sample rate

of at least 16Khz. The low pass filter on the

input removes the high frequency artifacts

generated during the sampling process.

Some older model Digilent boards may need

a Digilent Module Interface Board (MIB) and a

6-pin cable to connect to the PmodAMP2. The

MIB plugs into the system board and the cable

connects the PmodAMP2 to the MIB.

Additionally, the PmodAMP2 accepts inputs

from a variety of line level audio signals. A line

level input, like the output of a portable CD

player or MP3 player, will typically be a 1V

peak-to-peak analog voltage. The input band-

pass filter clarifies and amplifies the input

voltage from the signal source and then directs

the signal to the output jack to drive a speaker.

The connector J2 operates as the speaker

output. (See figure 1)

Note: For more information about the operation

and features of the Analog Devices SSM2377

Audio Amplifier integrated circuit please see

the datasheet available at www.analog.com.

Functional Description

The gain on the PmodAMP2 may be selected

by tying the GAIN input to either logic ‘1’ or

logic ‘0’. (See table 1)

Table 1

GAIN Input

Gain

6 decibels (dB)

12 decibels (dB)

The PmodAMP2 features a micropower

shutdown mode with a typical shutdown

current of 100 nA. Users can enable the

shutdown by applying a logic low to the

SHUTDOWN pin. A10K-ohm resistor pulls the

pin down to ground. To operate the AMP2

users must ensure the SHUTDOWN pin is in

the highest position.

Customers will generally use the PmodAMP2

module with a Digilent programmable logic

system board or microcontroller board. These

boards produce either a pulse width modulated

digital signal or an analog signal via a digital to

analog converter. Most Digilent system boards

have 6-pin connectors that allow the

PmodAMP2 to plug directly into the system

board or to connect via a Digilent 6-pin cable.

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PMODAMP2 [ETC]

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