Texas Instruments THS4502EVM Manual de usuario

THS4502EVM

June 2002 HPL

User’s Guide

SLOU129

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

and applications, customers should provide adequate design and operating safeguards.

TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,

in which TI products or services are used. Information published by TI regarding third−party products or services

does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.

Use of such information may require a license from a third party under the patents or other intellectual property

of the third party, or a license from TI under the patents or other intellectual property of TI.

Reproduction of information in TI data books or data sheets is permissible only if reproduction is without

alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction

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Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 5 V and the output

voltage range of +5 V and –5 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible

damage to the EVM. If there are questions concerning the input range, please contact a TI

field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or

possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to

connecting any load to the EVM output. If there is uncertainty as to the load specification,

please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than

60°C. The EVM is designed to operate properly with certain components above 60°C as long

as the input and output ranges are maintained. These components include but are not limited

to linear regulators, switching transistors, pass transistors, and current sense resistors. These

types of devices can be identified using the EVM schematic located in the EVM User’s Guide.

When placing measurement probes near these devices during operation, please be aware

that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Information About Cautions and Warnings

iii

Preface



About This Manual

This manual provides information about using the THS4502 fully differential

amplifier on evaluation module PCB marked with Edge # 6439396.

Additionally, this document provides a good example of PCB design for

high-speed applications. The user should keep in mind the following points.

-The design of the high-speed amplifier PCB is a sensitive process.

-The user must approach the PCB design with care and awareness.

-It is recommended that the user initially review the data sheet of the device

under test.

-It is helpful to review the schematic and layout of the THS4502EVM to

determine the design techniques used in the evaluation board.

-It is recommended that the user review the application note Fully

Differential Amplifiers (literature number SLOA054) to learn more about

differential amplifiers. This application note reviews fully differential amps

and presents calculations for various filters.

How to Use This Manual

This document contains the following chapters:

-Chapter 1—Introduction and Description

-Chapter 2—Using the THS4502EVM

-Chapter 3—THS4502EVM Applications

-Chapter 4—High-Speed Amplifier PCB Layout Tips

-Chapter 5—EVM Hardware Description

Information About Cautions and Warnings

This book may contain cautions and warnings.

This is an example of a caution statement.

A caution statement describes a situation that could potentially

damage your software or equipment.

Related Documentation From Texas Instruments

This is an example of a warning statement.

A warning statement describes a situation that could potentially

cause harm to you.

The information in a caution or a warning is provided for your protection.

Please read each caution and warning carefully.

FCC Warning

This equipment is intended for use in a laboratory test environment only. It gen-

erates, 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 en-

vironments 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.

Electrostatic Sensitive Components

This EVM contains components that can potentially be damaged by

electrostatic discharge. Always transport and store the EVM in its

supplied ESD bag when not in use. Handle using an antistatic

wristband. Operate on an antistatic work surface. For more

information on proper handling, refer to SSYA008.

Related Documentation From Texas Instruments

The URLs below are correct as of the date of publication of this manual. Texas

Instruments applications apologizes if they change over time.

-THS4502 data sheet (literature number SLOS350)

-Application report (literature number SLOA054), Fully Differential

Amplifiers

-Application report (literature number SLOA069), How (Not) to Decouple

High Speed Op Amp Circuits,

http://www−s.ti.com/sc/psheets/sloa069/sloa069.pdf

-Application report (literature number SLOA072), Single Supply Differen-

tial Op Amp Techniques,

http://www−s.ti.com/sc/psheets/sloa072/sloa072.pdf

Trademarks

-Application report (literature number SLMA002), Power Pad Thermally

Enhanced Package,

http://www−s.ti.com/sc/psheets/slma004/slma002.pdf

-Application report (literature number SLMA004), PowerPAD Made Easy,

http://www−s.ti.com/sc/psheets/slma004/slma004.pdf

-Application report (literature number SSYA008), Electrostatic Discharge

(ESD), http://www−s.ti.com/sc/psheets/ssya008/ssya008.pdf

Trademarks

PowerPAD is a trademark of Texas Instruments.

Contents

vii



1 Introduction and Description 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1 Description 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Evaluation Module Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 THS4502EVM Operating Conditions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 EVM Default Configuration 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Using the THS4502EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 Required Equipment 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 Power Supply Connection 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Function Generator Setup 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Signal Connections VIN− 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 THS4502EVM Applications 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Single-Ended In/Single-Ended Out, Utilizing Transformer 3-2. . . . . . . . . . . . . . . . . . . . . . . .

3.2 Single-Ended to Fully Differential Application 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 High-Speed Amplifier PCB Layout Tips 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 EVM Hardware Description 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

viii



1−1. Schematic of the Populated Circuit on the EVM (Default Configuration) 1-3. . . . . . . . . . . . . .

2−1. Power Supply Connection for ±5 Vdc 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2−2. Signal Connections 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−1. Single-Ended In/Single-Ended Out, Utilizing Transformer 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . .

3−2. Single Supply Operation 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3−3. Output of an AC-Coupled, Single-Supply Application 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−1. Top Layer 1 (Signals for THS4502EVM) 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−2. Bottom Layer 2 (Ground and Signal) 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5−3. Schematic Diagram 5-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



5−1 THS4502EVM Bill of Materials 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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