Texas Instruments SLOU106 Manuale utente

THS4140

EVM User's Guide for HighĆSpeed

Full ĆDifferential Amplifier

February 2001 Mixed-Signal Products

User’s Guide

SLOU106

IMPORTANT NOTICE

TexasInstrumentsand itssubsidiaries(TI) reservetheright tomakechanges totheirproducts orto 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 acknowledgment, including those

pertaining to warranty, patent infringement, and limitation of liability.

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

TI’sstandardwarranty.TestingandotherqualitycontroltechniquesareutilizedtotheextentTIdeemsnecessary

to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except

those mandated by government requirements.

Customers are responsible for their applications using TI components.

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.

TIassumes no liabilityforapplications assistanceorcustomer product design.TIdoes notwarrantor represent

thatanylicense,eitherexpressorimplied,isgrantedunderanypatentright,copyright,mask workright,orother

intellectual property right of TI covering or relating to any combination, machine, or process in which such

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iii

Read This First

Preface

About This Manual

This manual is written to provide information about the evaluation module of

the fully differential amplifier under test. 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 an elegant and sensitive

process. Therefore, the user must approach the PCB design with care and

awareness. It is recommend that the user initially review the datasheet of the

device under test. It is also helpful to review the schematic and layout of the

THS4140 EVM to determine the design techniques used in the evaluation

board.In addition, itis recommended thatthe user reviewthe application note

Fully-Differential Amplifiers

(literature number SLOA054B) to gain more

insight about differential amplifiers. This application note reviews the

differential amplifiers and presents calculations for various filters.

How to Use This Manual

Chapter 1—Introduction and Description

Chapter 2—Using the THS4140 EVM

Chapter 3—General High-Speed Amplifier Design Considerations

Related Documentation From Texas Instruments

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.

Related Documentation From Texas Instruments

THS4140 data sheet (literature number SLOS320)

THS4140 application report (literature number SLOA054A),

Fully-Differential Amplifiers

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

testedforcompliance withthelimits ofcomputingdevices pursuant tosubpart

Jofpart15ofFCCrules,whicharedesignedtoprovidereasonableprotection

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

PowerPAD is a trademark of Texas Instruments.

Running Title—Attribute Reference

Chapter Title—Attribute Reference

Contents

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

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

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

1.3 THS4140 EVM Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Schematic of the Populated Circuit (Default Configuration) 1-3. . . . . . . . . . . . . . . . . . . . . . .

1.5 THS4140 EVM Schematic 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Additional Sample Schematics 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7 THS4140 EVM Layout 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Using the THS4140 EVM 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

2.2 Power Supply Setup 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.3 Input and Output Setup 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4 Testing the EVM Setup 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.5 Power Down Verification 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.6 Measuring the Frequency Response 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.7 Butterworth Filter 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.8 THS4140 EVM Bill of Materials 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 General High-Speed Amplifier Design Considerations 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

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

1–2 Schematic 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 Fully-Differential In/Fully-Differential Out, Without Transformer 1-5. . . . . . . . . . . . . . . . . . . . . .

1–4 Fully-Differential In/Fully-Differential Out, Utilizing Transformer 1-5. . . . . . . . . . . . . . . . . . . . . .

1–5 VICR Level Shifter 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–6 Butterworth Filter With Multiple Feedback 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–7 Top Layer (Silkscreen) 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–8 Top (Layer 1) (Signals) 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–9 Internal Plane (Layer 2) (Ground Plane) 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–10 Internal Plane (Layer 3) (+ VCC Plane) 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–11 Bottom (Layer 4) (Ground and Signal) 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 Power Supply Connection 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 Signal Connections 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 Driver 1 Output Signal 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 Multiple Feedback Filter Circuit 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–5 Gain vs Phase 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1 THS4140 EVM Bill of Materials 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction and Description

The Texas Instruments THS4140 evaluation module (EVM) helps designers

evaluate the performance of the THS4140 operational amplifier. Also, this

EVM is a good example of high-speed PCB design.

This document details the Texas Instruments THS4140 high-speed

operational amplifier evaluation module (EVM). It includes a list of EVM

features,abriefdescriptionofthemoduleillustratedwithaseriesofschematic

diagrams, EVM specifications, details on connecting and using the EVM, and

a discussion of high-speed amplifier design considerations.

ThisEVMenablestheusertoimplementvariouscircuitstoclarifytheavailable

configurations presented by the schematic of the EVM. In addition, the

schematic of the default circuit has been added to depict the components

mounted on the EVM when it is received by the customer. This configuration

correlates to the single input/differential output signal.

Othersamplecircuitsarepresentedtoshowhowtheusercanimplementother

circuit configurations such as differential input/differential output signal,

transformer utilization on the input and output terminals, VICR level shifter,

and Butterworth filter with multiple feedback. The user may be able to create

and implement circuit configurations in addition to those presented in this

document using the THS4140 EVM.

Topic Page

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

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

1.3 THS4140 EVM Specification 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Schematic of the Populated Circuit (Default Configuration) 1-3. . . . . . .

1.5 THS4140 EVM Schematic 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Additional Sample Schematics 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7 THS4140 EVM Layout 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1

Description

1-2

Introduction and Description

1.1 Description

The THS4140 EVM is a good example of PCB design and layout for

high-speed operational amplifier applications. It is a complete circuit for the

high-speed operational amplifier. The EVM is made of the THS4140

high-speed operational amplifier, 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 board

measures 4.5 inches in length by 2.5 inches in width. Initially, this board is

populated for a single-ended input amplifier (see Figure 1-2 for populated

circuits). The outputs (VO+ and VO–) can be tested differentially or single

ended. Gain is set to one and can be changed by changing the ratios of the

feedback and gain resistors (see the device datasheet for recommended

resistor values). The user may populate various footprints on the evaluation

moduleboard to verifyfilter designsor perform other experiments. Eachinput

isterminatedwitha50-Ωresistorto provide correctline-impedancematching.

1.2 Evaluation Module Features

THS4140 high-speed operational amplifier EVM features include:

Voltage supply operation range: 5-V to ±15-V operation (see the

device data sheet)

Single and differential input and output capability

Nominal 50-Ωinput and output termination resistors. They can be

configured according to the application requirement.

VOCM direct input control (see schematic and the device data sheet)

VOCM pin can be controlled via transformer center-tap (see

schematic)

Shutdown pin control, JU1 (if applicable to the device, see the device

data sheet)

Input and output transformer footprints for changing single-ended

signals to differential signals

Footprint for high-precision, balanced feedback and gain resistors

(0.01% or better)

Footprints for low-pass filter implementation (see application note

SLOA054A)

Footprints for antialiasing filter implementation (see application note

SLOA054A)

Differential probe terminals on input and output nodes for differential

probe insertion

Various GND and signal test points on the PCB

Circuit schematic printed on the back of the EVM

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

THS4140 EVM Specifications

1-3

Introduction and Description

1.3 THS4140 EVM Specifications

Supply voltage range, ±VCC 5 V to ±15 V (see the device data sheet). . . .

Supply current, ICC (see the device data sheet). . . . . . . . . . . . . . . . . . . . . . . .

Output drive, IO, VCC = ±15 (see the device data sheet). . . . . . . . . . . . . . . . .

For complete THS4140 amplifier IC specifications, parameter measurement

information, and additional application information, see the THS4140 data

sheet, TI literature number SLOS320.

1.4 Schematic of the Populated Circuit (Default Configuration)

For verification of jumper locations and other bypass components, see the

complete EVM schematic in Figure 1–2.

Figure 1–1.Schematic of the Populated Circuit on the EVM (Default Configuration)

374 Ω

–

THS4140

–

VCC

VCC–

402 Ω

0 Ω

VIN

AC 0 Ω

0 Ω

RX1

0 Ω

R1b

R1a 374 Ω

R3b

R3a

R6a

C1 VOCM

R4b

R4a 0 Ω

0 Ω

Rx4

Rx5 49.9 Ω

49.9 Ω

R10

Rx6

50 Ω

Source

NOTE: Default populated footprints on the EVM from the input nodes to the output terminals Gain = 1

402 Ω

R6B

RX3

49.9 Ω

JU4

JU3

Rx0

24.9 Ω

THS4140 EVM Schematic

1-4

Introduction and Description

1.5 THS4140 EVM Schematic

Figure 1–2.Schematic

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