Texas Instruments THS4271EVM-UG Manual de usuario

THS4271EVM−UG

Unity Gain

October 2002 High Performance Linear Products

User’s Guide

SLOU147

DEVICE

THS4271

THS4275

EVM TITLE USER’S GUIDE DESCRIPTION SHUTDOWN

THS4271EVM-UG

THS4271EVM

THS4275EVM

THS4271 Unity Gain EVM

THS4271/75EVM

Noninverting unity gain configuration only

Configurable for gains ≥+2/-1

Yes

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

of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for

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Resale of TI products or services with statements different from or beyond the parameters stated by TI for that

product or service voids all express and any implied warranties for the associated TI product or service and

is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.

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 assumesno 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 specified input and output ranges described in

the EVM User’s Guide. The input supply voltage (±VS) should be no greater than ±7.5 V for

dual supply (VSshould be no greater than 15 V for single supply operation). The differential

input signal (VID) should be no greater than ±3 V. The output current (IO) should be no greater

than 100 mA.

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

Read This First

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.

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.

Trademarks

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 URL’s below are correct as of the date of publication of this manual. Texas

Instruments applications apologizes if they change over time.

-THS4271/THS4275 data sheet (SLOS397)

-Application report (SLMA002), PowerPAD Thermally Enhanced Package,

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

-Application report (SLMA004), PowerPAD Made Easy,

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

-Application report (SSYA008), Electrostatic Discharge (ESD),

http://www-s.ti.com/sc/psheets/ssya008/ssya008.pdf

-Application report (SLOA102), High Speed PCB Layout Tips,

http://www-s.ti.com/sc/psheets/sloa102/sloa102.pdf

Trademarks

PowerPAD is a trademark of Texas Instruments.

Contents

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

1.1 Evaluation Schematic 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Using the EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 EVM Applications 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Default Configuration 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 EVM Hardware Description 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1-1 Schematic of the THS4271EVM-UG Unity Gain 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1 Test Equipment Connections 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1 Default Configuration 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2 Noninverting Gain Stage 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1 Board Layout Views 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

4-1 THS4271EVM-UG Unity Gain Bill of Materials 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction and Description

This EVM provides a platform for testing the THS4271 in 8-pin LLP (DRB)

package in a noninverting, unity gain mode. It contains the high-speed op amp,

a number of passive components, and various features and footprints that

enable the user to experiment, test, and verify various operational amplifier

circuit implementations.

The THS4271 unity gain EVM was developed to reduce peaking caused by

lead inductance in the feedback path, which proved to be excessive in a more

general layout. This EVM is designed to minimize peaking in the unity gain

configuration. Each pad and trace on a PCB has an inductance associated

with it, when in conjunction with the inductance associated with the package

may cause peaking in the frequency response, hence, cause the device to be-

come unstable.

Minimizing the inductance in the feedback path is critical for reducing the peak-

ing of the frequency response in unity gain. The recommended maximum in-

ductance allowed in the feedback path is 4 nH. This can be calculated by using

the following equation:

L(nH) +Kȏƪln 2ȏ

W)T)0.223W)T

ȏ)0.5ƫ

Where:

W = Width of trace

ȏ+Length of the trace

T = Thickness of the trace

K = 5.08 nH/inch

K = 0.2 nH/mm for Getek 4.2 epoxy polyphenylene oxide resin.

Dimensions are in inches unless otherwise specified.

Chapter 1

Evaluation Schematic

1-2

1.1 Evaluation Schematic

As delivered, the EVM has a fully functional example circuit—just add power

supplies, a signal source, and monitoring instrument. See Figure 1–1 for a

complete schematic diagram. EVM features include:

-Wide operating supply voltage range: single supply 4.5 V to dual supply

±7.5 V operation (see the device data sheet). Single supply operation is

obtained by connecting both J6 (GND) and J7 (VS-) to ground.

-Nominal 50-Ωinput impedance (R4). Termination can be configured

according to the application requirement.

-50-Ωimpedance traces on Vin+, and the Vin- to Vout connection (see

Figure 4-1—the vias provide the impedance)

-Convenient GND test point (TP1).

-453-Ω series matching resistor (R6)—produces a 500-Ωload in

combination with resistor R7. 500 Ωis the standard data sheet load

impedance.

-Power supply ripple rejection capacitors (C1 and C2).

-Decoupling capacitors (C3, C4, C5, C6).

-Power PADtheatsinking capability.

-A good example of high-speed amplifier PCB design and layout.

Figure 1-1.Schematic of the THS4271EVM-UG Unity Gain

GND

Vs-

+C2

FB1

Vs+

Vin+

FB2

Vs-

Vs+

100 pF

THS4271

TP1

Vout

Vs-

Vs+

C6C5

100 pF

49.9 W

453 W

49.9 W

0.1 mF22 mF22 mF0.1 mF

2-1

Using the EVM

Figure 2-1 shows how to connect power supplies, signal source and monitor-

ing instrument. It is recommended that the user connect the EVM as shown

to avoid damage to the EVM or the op amp installed on the board.

Figure 2-1.Test Equipment Connections

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