Texas Instruments THS4031 User manual

THS4031 HighĆSpeed

Operational Amplifier

Evaluation Module

June 1999 Mixed-Signal Products

User’s Guide

SLOU030

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iii

Chapter Title—Attribute Reference

Preface

Related Documentation From Texas Instruments

THS4031 HIGH-SPEED LOW-POWER OPERATIONAL

AMPLIFIER

(literature number SLOS224) This is the data sheet

for the THS4031 operational amplifier integrated circuit that is

used in the THS4031 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

testedforcompliancewiththelimitsofcomputing devices pursuant to subpart

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.

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 THS4031 EVM Specifications 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Using The THS4031 EVM 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 THS4031 EVM Performance 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 General High-Speed Amplifier Design Considerations 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . .

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

2.1 THS4031 High-Speed Operational Amplifier EVM Parts List 2-2. . . . . . . . . . . . . . . . . . . . . .

2.2 THS4031 EVM Board Layouts 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

1–1 THS4031 Evaluation Module 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–2 THS4031 EVM Schematic 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–3 THS4031 EVM Noninverting Input Frequency Response 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . .

1–4 THS4031 EVM Noninverting Input Phase Response 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–5 THS4031 EVM Inverting Input Frequency Response 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1–6 THS4031 EVM Inverting Input Phase Response 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–1 THS4031 EVM Component Placement Silkscreen and Solder Pads 2-2. . . . . . . . . . . . . . . . .

2–2 THS4031 EVM PC Board Layout – Component Side 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3 THS4031 EVM PC Board Layout – Back Side 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

2–1 THS4031 EVM Parts List 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

General

This chapter details the Texas Instruments (TI) THS4031 high-speed

operational amplifier evaluation module (EVM), SLOP203. It includes a list of

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

aschematicdiagram,EVMspecifications,detailsonconnectingandusingthe

EVM, and a discussion on high-speed amplifier design considerations.

Topic Page

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

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

1.3 THS4031 EVM Specifications 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.4 Using The THS4031 EVM 1–5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5 THS4031 EVM Performance 1–6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.6 General High-Speed Amplifier Design Considerations 1–8. . . . . . . . . . .

Chapter 1

Feature Highlights

1-2

General

1.1 Feature Highlights

THS4031 High-Speed Operational Amplifier EVM features include:

High Bandwidth — 100 MHz, –3 dB at ±15 VCC and Gain = 2

±5-V to ±15-V Operation

Inverting and Noninverting Single-Ended Inputs

ModuleGainSetto+2(Noninverting)and–1(Inverting)—Adjustable

Through Component Change.

Nominal 50-ΩImpedance Inputs and Outputs

Standard SMA Miniature RF Connectors

Good Example of High-Speed Amplifier Design and Layout

Description

1-3

General

1.2 Description

The TI THS4031 high-speed operational amplifier evaluation module (EVM)

is a complete high-speed amplifier circuit. It consists of the TI THS4031

high-speed, low-power operational amplifier IC, along with a small number of

passive parts, mounted on a small circuit board measuring approximately

1.7 inch by 1.4 inch (Figure 1–1). The EVM uses standard SMA miniature RF

connectors for inputs and outputs and is completely assembled, fully tested,

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

(if desired).

Figure 1–1.THS4031 Evaluation Module

NONINVERTING

+VCC

R1 C3

GND

–VCC

R3 U1

–IN

GND

OUT

GND

+IN

GND

INVERTING

SLOP203

THS4031 EVM Board

INSTRUMENTS

+TEXAS

The THS4031 EVM is equipped with both noninverting and inverting inputs.

The noninverting input is set for a gain of +2 and the inverting input is set for

a gain of –1. Each input is terminated with a 50-Ωresistor to provide correct

line impedance matching (Figure 1–2). The amplifier IC output is routed

through a 50-Ωresistor, both to provide correct line impedance matching and

to help isolate capacitive loading on the output of the amplifier. Capacitive

loadingdirectlyon theoutputoftheIC decreasestheamplifier’sphasemargin

and can result in peaking or oscillations.

Description

1-4

General

Figure 1–2.THS4031 EVM Schematic

–IN

Inverting

+IN

Noninverting

Out

49.9 Ω

–VCC

–U1

THS4031

6.8 µF

301 ΩR4

301 Ω

49.9 Ω

0.1 µF

6.8 µF

0.1 µF

VCC

–VCC

VCC

GND

J1 1–VCC

3VCC

The gain of the EVM inputs can easily be changed to support a particular

application by simply changing the ratio of resistors R1, R4, and R5 as

described in the following equations:

Inverting Gain

–RF

–R4

Noninverting Gain

)

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

of 75-Ωcable and 75-ΩEVM input termination and output isolation resistors.

Any resistor on the EVM board can be replaced with a resistor of a different

value; however, care must be taken because the surface-mount solder pads

on the board are somewhat fragile and will not survive many desoldering/

soldering operations.

Notethatexternal factorscansignificantlyaffecttheeffectivegainoftheEVM.

For example, connecting test equipment with 50-Ωinput impedance to the

EVM output will divide the output signal level by a factor of 2 (assuming the

output isolation resistor on the EVM board remains 50 Ω). Similar effects can

occur at the input, depending upon how the input signal sources are

configured. The gain equations given above assume no signal loss in either

the input or the output.

The EVM circuit board is an excellent example of proper board layout for

high-speed amplifier designs and can be used as a guide for user application

board layouts.

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