Texas Instruments THS3062EVM Manuale utente

THS3062EVM

September 2002 High Performance Linear Products

User’s Guide

SLOU146

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

such altered documentation.

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 must not exceed ±15 V for dual supply or 30 V

for single supply. The differential input signal must not exceed ±3 V. The output current must

not exceed 150 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

xxx°C. The EVM is designed to operate properly with certain components above xxx°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

How to Use This Manual

This document contains the following chapters:

-Chapter 1—Introduction and Description

-Chapter 2—Using The THS3062EVM

-Chapter 3—THS3062EVM Applications

-Chapter 4—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.

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.

Trademarks

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.

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.

-THS3062 data sheet (SLOS394)

-Application report (SLOA069), How (Not) to Decouple High Speed Op

Amp Circuits, http://www-s.ti.com/sc/psheets/sloa069/sloa069.pdf

-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

-High-Speed Amplifier 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 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Using the THS3062EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 THS3062EVM Applications 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Inverting Gain Stage 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

3.3 Applications for EVM Channel 2 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Figures

1-1 Schematic of the THS3062EVM 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1 THS3062EVM Interconnection Diagram 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1 Inverting Gain Stage 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

4-1 Top Layer 1 (Signals and Silkscreen) for THS3062EVM 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2 Internal Plane (Layer 2) Ground Plane 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3 Internal Plane (Layer 3) Power Layer 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-4 Bottom (Layer 4) Ground and Signal 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

4-1 THS3062EVM Bill of Materials 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents

1-1

Introduction and Description

This chapter provides a description of the THS3062EVM dual high-speed

operational amplifier along with a schematic diagram.

1.1 Evaluation Schematic

As delivered, the EVM has a fully functional example circuit, requiring added

power supplies, a signal source, and a monitoring instrument. The default

schematic diagram is provided in Figure 1-1. The user can change the gain

by changing the ratios of the feedback and gain resistors (see the device data

sheet for recommended resistor values). The complete EVM

schematic—showing all components—is shown in this chapter.

EVM Channel 1:

The default configuration for EVM channel 1 is designed to provide a voltage

gain of -1 and a gain of about +2 depending on which input is connected to

the signal source. This voltage gain is the ratio of the voltage at the output pin

of the amplifier (pin 1) to the voltage at the input at J2 or J3 respectively.

For optimum frequency response and stability at either -1 or +2 gain, a

feedback resistor, R6 (562 Ω), is chosen. R1 is set to the same value to provide

a gain in the inverting configuration of -1. To match the signal generator,

source impedance R2 was set to 54.9 Ω. This is the closest value when placed

in parallel with R3 (562 Ω) that terminates the inverting input to 50 Ω. R4 is set

to 953 Ωbecause when a high impedance instrument is connected to the

output connector, J1, the amplifier is loaded at about 1 kΩ.

When EVM channel 1 is used as an inverting amplifier in the default

configuration connected to a 50-Ωinput device, R4 causes a slight gain error.

The total voltage gain is the negative ratio of the feedback resistor, R6, and the

gain resistor, R3, times the voltage divider created by R5, R4 and the

measurement device input termination resistance. This gain follows the

following equation:

VI+*R6

R1 ǒR4 ø50 W

R4 ø50 W)R5Ǔ+*0.475 (1)

Chapter 1

Evaluation Schematic

1-2

The noninverting gain of the EVM channel 1 amplifier, when using the default

configuration, is affected by the same slight gain error plus the gain error im-

posed by the inverting input termination resistor, R2. The following equation

shows the gain for this situation:

VI+ǒ1)R6

R1 )R2ǓǒR4 ø50 W

R4 ø50 W)R5Ǔ+0.908 (2)

EVM Channel 2:

The default configuration for EVM channel 2 provides for a voltage gain of +1.

This voltage gain is the ratio of the voltage at the output pin of the amplifier (pin

7) to the voltage at the input at J5. For optimum frequency response and stabil-

ity at a gain of +1 the feedback resistor, R7, of 750 Ω was chosen.

The noninverting gain of the EVM channel 2 amplifier, when using the default

configuration, is affected by the same slight gain error caused by R12 as

shown in Equation 1 and indicated in the following equation:

VI+ǒ*R12 ø50 W

R12 ø50 W)R11Ǔ+*0.475 (3)

THS3062 dual high-speed operational amplifier EVM features include:

-Wide operating supply voltage range: dual supply ±5 Vdc to dual supply

±15 Vdc operation (see the device data sheet). Single supply operation is

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

-Convenient GND test point (TP1).

-Power supply ripple rejection provided by inductors FB1 and FB2 followed

by tantalum capacitors C5 and C6.

-Decoupling capacitors, C7and C8, populated with 0.1 µF and capacitors,

C9 and C10, populated with 100 pF—design final decoupling in accor-

dance with SLOA069.

-Nominal 50-Ωinput impedance for each of the configured inputs, V1in-,

V1in+ and V2in+. Termination can be configured according to the applica-

tion requirement.

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

High-Speed Amplifier PCB Layout Tips, SLOA102.

-50-Ωseries matching resistors (R5 and R11).

-953-Ωresistor to ground provide minimum load through 1 kΩon each

amplifier.

-PowerPAD heatsinking capability.

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