Texas Instruments SLOU025 User Manual

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TPA122 MSOP

Audio Power Amplifier

Evaluation Module

User's Guide

1998

Mixed-SignalProducts

SLOU025

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (ªCRITICAL APPLICATIONSº). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORTDEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK.

In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.

Copyright 1998, Texas Instruments Incorporated

Preface

Related Documentation From Texas Instruments

JTI Plug-N-PlayAudio Amplifier Evaluation Platform(literature number SLOU011) provides detailed information on the evaluation platform and its use with TI audio evaluation modules.

JTPA122 150-mWSTEREO AUDIO POWER AMPLIFIER

(literature number SLOS211) This is the data sheet for the TPA122 audio amplifier integrated circuit.

FCC Warning

This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.

Trademarks

TI is a trademark of Texas Instruments Incorporated.

Chapter TitleÐAttribute Reference

iii

iv

Running TitleÐAttribute Reference

Contents

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.1 Feature Highlights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

1.2 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

1.3 TPA122 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22.2 Quick Start List for Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32.3 Quick Start List forStand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

3 Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

3.1

Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.2

The TPA122 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . .

3-3

 

3.2.1 TPA122 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

 

3.2.2

Module Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

 

3.2.3

Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-5

3.3

Using The TPA122 MSOP EVM With The Plug-N-PlayEvaluation Platform . . . . . . . . .

3-6

 

3.3.1 Installing and Removing EVM Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-6

 

3.3.2

Signal Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-7

 

3.3.3

Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-8

 

3.3.4

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-9

 

3.3.5

Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10

3.4

Using The TPA122 MSOP EVM Stand-Alone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-11

 

3.4.1 TPA122 MSOP EVM Connected as a Stereo Headphone Amplifier . . . . . . .

3-11

3.5

TPA122 MSOP Audio Amplifier Evaluation Module Parts List . . . . . . . . . . . . . . . . . . . .

3-12

Chapter TitleÐAttribute Reference

v

Running TitleÐAttribute Reference

Figures

1±1 The TI TPA122 MSOP Audio Amplifier Evaluation Module . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42±1 Quick Start Platform Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-22±2 Quick Start Module Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-43±1 The TIPlug-N-PlayAudio Amplifier Evaluation Platform . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23±2 TPA122 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33±3 TPA122 MSOP EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33±4 TPA122 Audio Amplifier IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-43±5 Platform Signal Routing and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-73±6 Mute Polarity Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-83±7 Typical Headphone Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-103±8 TPA122 MSOP EVM Connected as a Stereo Headphone Amplifier . . . . . . . . . . . . . . . . .3-11

Tables

2±1 Typical TI Plug-N-PlayPlatform Jumper and Switch Settings for the

 

 

TPA122 MSOP EVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

2±2

Platform Jumper and Switch Settings for the TPA122 MSOP EVM . . . . . . . . . . . . . . . . . . .

2-3

3±1

TPA122 MSOP EVM Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-12

vi

Chapter 1

Introduction

This chapter provides an overview of the Texas Instruments (TI ) TPA122 MSOP Audio Amplifier Evaluation Module (SLOP125). It includes a list of EVM features, a brief description of the module illustrated with a pictorial diagram, and a list of EVM specifications.

Topic

 

Page

 

 

 

1.1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1±2

1.2

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1±3

1.3

TPA122 MSOP EVM Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. 1±3

 

 

 

Introduction 1-1

Features

1.1 Features

The TI TPA122 MSOP Audio Amplifier Evaluation Module and the TI Plug-N-PlayAudio Amplifier Evaluation Platform include the following features:

- TPA122 MSOP Stereo Audio Power Amplifier Evaluation Module

JDual channel, single-endedoperation

J150-mWoutput power into 8Ω at 5 V

J2.5-Vto5.5-Voperation

JVery low distortion Ð THD+N is less than 0.006% @ 1 kHz and less than 0.07% from 20 Hz to 20 kHz into 10-kΩ loads; less than 0.02% @ 1 kHz and less than 0.4% from 20 Hz to 20 kHz into32-Ω loads; and

less than 0.05% @ 1 kHz and less than 0.8% from 20 Hz to 20 kHz into 8-Ω loads

JExtremely low current consumption in shutdown mode

JInternal thermal and short-circuitprotection

JInternal pop reduction circuitry

-Quick and Easy Configuration with the TI Plug-N-PlayAudio Amplifier Evaluation Platform

JEvaluation module is designed to simply plug into the platform, automatically making all signal, control, and power connections

JPlatform provides flexible power options

JJumpers on the platform select power and module control options

JSwitches on the platform route signals

JPlatform provides quick and easy audio input and output connections

-Platform Power Options

JOnboard 9-Vbattery

JExternal 5-V±15-V(VCC) supply inputs

JExternal regulated VDD supply input

JSocket for on-board5-VVDD voltage regulator EVM

JOn-boardovervoltage and reverse polarity power protection

-Platform Audio Input and Output Connections

JLeft and right RCA phono jack inputs

JMiniature stereo phone jack input

JLeft and right RCA phono jack outputs

JLeft and right compression speaker terminal outputs

JMiniature stereo headphone jack output

1-2

Introduction

Description

1.2 Description

The TPA122 MSOP Audio Power Amplifier Evaluation Module is a complete, low-powerstereo audio power amplifier forhigh-fidelityline-leveloutput, headphone, and small speaker applications. It consists of the TI TPA122150-mWStereo Audio Power Amplifier IC in a very small MSOP package, along with a small number of other parts mounted on a circuit board that is approximately one and a quarter inches square (Figure 1±1).

Figure 1±1. The TI TPA122 Audio Amplifier Evaluation Module

Shutdown

VDD

GND

 

 

 

S1

+

 

 

R1

C5

 

IN1

R2

 

GND

C1

R3

 

 

 

 

 

 

 

Vo1

 

C2

U1²

GND

TEXAS

 

 

INSTRUMENTS

 

C4

 

C3

R5

 

 

R4

GND

 

 

 

IN2

SLOP127

Vo2

GND

 

TPA122 MSOP EVM

 

² Due to the very small size of the MSOP IC package, the standard part number TPA122 is replaced with the code TIAAE

Single in-lineheader pins are mounted to the underside of the module circuit board to allow the EVM to be plugged into the TIPlug-N-PlayAudio Amplifier Evaluation Platform, or to be wired directly into existing circuits and equipment when usedstand-alone.

The platform has room for a single TPA122 evaluation module. It is a convenient vehicle for demonstrating TI's audio power amplifier and related evaluation modules. The EVMs simply plug into the platform, which automatically provides power to the modules, interconnects them correctly, and connects them to a versatile array of standard audio input and output jacks and connectors. Easy-to-useconfiguration controls allow the platform and EVMs to quickly model many possibleend-equipmentconfigurations.

There is nothing to build, nothing to solder, and nothing but the speakers included with the platform to ªhook up.º

1.3 TPA122 MSOP EVM Specifications

Supply voltage range, VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . 2.5 V to 5.5 V

Supply current, IDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . 160 mA, max

Continuous output power, PO: 8Ω, VDD =5 V . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . 150 mW

Audio input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VDD + 0.3 Vpp, max

Minimum load impedance, RL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . 8 Ω

Introduction 1-3

1-4

Introduction