Texas Instruments THS4082 Manuale utente

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September 2000 Mixed-Signal Products

User’s Guide

SLOU075

IMPORTANT NOTICE

TexasInstruments andits subsidiaries(TI) reservethe rightto makechanges totheir productsor todiscontinue

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 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

TIdeemsnecessarytosupport thiswarranty. Specifictestingofallparameters ofeachdevice isnotnecessarily

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 noliabilityforapplicationsassistance orcustomer productdesign. TIdoes notwarrantorrepresent

thatanylicense,eitherexpressorimplied,isgrantedunderanypatentright,copyright,maskworkright,orother

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.

iii

Chapter Title—Attribute Reference

Preface

Related Documentation From Texas Instruments



THS4081, THS4082 175-MHz LOW-POWER HIGH-SPEED

AMPLIFIERS

(literature number SLOS274) This is the data sheet

for the THS4082 operational amplifier integrated circuit that is

used in the THS4082 evaluation module.

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

testedforcompliancewiththelimitsofcomputingdevicespursuanttosubpart

Jofpart 15ofFCCrules,which aredesignedtoprovidereasonableprotection

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.

PowerPAD is a trademark of Texas Instruments Incorporated.

Running Title—Attribute Reference

Chapter Title—Attribute Reference

Contents

1 General 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

1.3 THS4082 EVM Noninverting Operation 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Using the THS4082 EVM in the Noninverting Mode 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 THS4082 EVM Inverting Operation 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Using the THS4082 EVM in the Inverting Mode 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7 THS4082 EVM Differential Input 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7.1 Differential Input, Noninverting Operation 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.7.2 Differential Input, Inverting Operation 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.8 Using the THS4082 EVM With Differential Inputs 1-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.9 THS4082 EVM Specifications 1-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.10 THS4082 EVM Performance 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.11 General High-Speed Amplifier Design Considerations 1-16. . . . . . . . . . . . . . . . . . . . . . . . . .

1.12 General PowerPAD Design Considerations 1-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Reference 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 THS4082 EVM Complete Schematic 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 THS4082 Dual High-Speed Operational Amplifier EVM Parts List 2-3. . . . . . . . . . . . . . . . .

2.3 THS4082 EVM Board Layouts 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

1–1 THS4082 Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 THS4082 EVM Schematic: Noninverting Operation 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 THS4082 EVM Schematic: Inverting Operation 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 THS4082 EVM Schematic: Differential Input (Noninverting Operation) 1-10. . . . . . . . . . . . . .

1–5 THS4082 EVM Schematic: Differential Input (Inverting Operation) 1-12. . . . . . . . . . . . . . . . . .

1–6 THS4082 EVM Frequency Response With Gain = 2 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–7 THS4082 EVM Phase Response With Gain = 2 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–8 PowerPADPCB Etch and Via Pattern 1-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–9 Maximum Power Dissipation vs Free-Air Temperature 1-18. . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 THS4082 EVM Schematic 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2 THS4082 EVM Component Placement Silkscreen and Solder Pads 2-4. . . . . . . . . . . . . . . . .

2–3 THS4082 EVM PC Board Layout: Component Side 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–4 THS4082 EVM PC Board Layout: Back Side 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1 THS4082 EVM Parts List 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

General

This chapter details the Texas Instruments (TI) THS4082 dual high-speed

operational amplifier evaluation module (EVM), SLOP239. It includes a list of

EVM features, a brief description of the module illustrated with a pictorial and

aschematicdiagram,EVMspecifications,detailsonconnectingandusingthe

EVM, and discussions on high-speed amplifier design and thermal

considerations.

Topic Page

1.1 Feature Highlights 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.2 Description 1–3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3 THS4082 EVM Noninverting Operation 1–4. . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Using the THS4082 EVM in the Noninverting Mode 1–6. . . . . . . . . . . . . . .

1.5 THS4082 EVM Inverting Operation 1–7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 Using the THS4082 EVM in the Inverting Mode 1–9. . . . . . . . . . . . . . . . . .

1.7 THS4082 EVM Differential Input 1–10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.8 Using the THS4082 EVM With Differential Inputs 1–14. . . . . . . . . . . . . .

1.9 THS4082 EVM Specifications 1–14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.10 THS4082 EVM Performance 1–15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.11 General High-Speed Amplifier Design Considerations 1–16. . . . . . . . .

1.12 General PowerPAD Design Considerations 1–17. . . . . . . . . . . . . . . . . . . .

Chapter 1

Feature Highlights

1-2

General

1.1 Feature Highlights

THS4082 dual high-speed operational amplifier EVM features include:

High Bandwidth: 75 MHz, –3 dB at ±15 VCC & Gain = 2

±5-V to ±15-V Operation

Noninverting Single-Ended Inputs: Inverting-Capable Through Com-

ponent Change

ModuleGainSetto2(Noninverting): AdjustableThroughComponent

Change

Nominal 50-ΩImpedance Inputs and Outputs

Standard SMA Input and Output Connectors

Good Example of High-Speed Amplifier Design and Layout

Description

1-3

General

1.2 Description

The TI THS4082 dual high-speed operational amplifier evaluation module

(EVM) is a complete dual high-speed amplifier circuit. It consists of the TI

THS4082 dual low-noise high-speed operational amplifier IC, along with a

small number of passive parts, mounted on a small circuit board measuring

approximately1.9inchby2.2inch(Figure1–1).TheEVMusesstandardSMA

miniatureRF connectors forinputs and outputsand is completelyassembled,

tested, and ready to use—just connect it to power, a signal source, and a load

(if desired).

Figure 1–1.THS4082 Evaluation Module

+VCC

–VCC

GND

VOUT1

SLOP239

THS4082 EVM Board

INSTRUMENTS

TEXAS

R10

R11

R12

R13

R14

R15

VOUT2

VIN1

VIN2

Note: The EVM is shipped with the following component locations empty:

C3, C6, R2, R4, R8, R10, and R12.

Although the THS4082 EVM is shipped with components installed for

dual-channel single-ended noninverting operation, it can also be configured

for single-channel differential and/or inverting operation by moving

components. Noninverting gain is set to 2 with the installed components. The

input of each channel is terminated with a 50-Ωimpedance to provide correct

line impedance matching. The amplifier IC outputs are routed through 50-Ω

resistors, both to provide correct line impedance matching and to help isolate

capacitive loading on the outputs of the amplifier. Capacitive loading directly

on the output of the IC decreases the amplifier’s phase margin and can result

in peaking or oscillations.

THS4082 EVM Noninverting Operation

1-4

General

1.3 THS4082 EVM Noninverting Operation

The THS4082 EVM is shipped preconfigured for dual-channel noninverting

operation, as shown in Figure 1–2.

Note:

Compensation capacitors C3 and C6 are not installed.

Figure 1–2.THS4082 EVM Schematic: Noninverting Operation

6.8 µF

–VCC 1

GND 2

+VCC 3

6.8 µF

–VCC

+VCC

–

U1:A

THS4082

0 Ω

1 kΩR6

1 kΩ

+VCC

x µF

49.9 ΩVOUT1

0.1 µF

–VCC

VIN1 R1

49.9 Ω

–

U1:B

THS4082

R11

0 Ω

R13

1 kΩR14

1 kΩ

x µF

R15

49.9 ΩVOUT2

VIN2 R9

49.9 Ω

0.1 µF

Thegain of the EVM can easily be changed to support a particular application

by simply changing the ratio of resistors R6 and R5 (channel 1) and R14 and

R13 (channel 2) as described in the following equation:

Noninverting Gain 1RF

RG1R6

R5 and 1 R14

R13

In addition, some applications, such as those for video, may require the use

ofa75-Ωcableand75-ΩEVMinputterminationandoutputisolationresistors.

Indice

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