Texas Instruments SN65LVDS387EVM Manuale utente

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July 2000 AAP Data Transmission

User’s Guide

SLLU013

Trademarks

iii

Read This First

Preface

Read This First

About This Manual

Thisistheuser’sguidefortheSN65LVDS387EVMandSN65LVDS386evalu-

ation modules (EVMs). It contains information on the evaluation modules

(EVMs)forTexasInstruments’SN65LVDS38716-channelLVDSdriverandfor

the SN65LVDS386 16-channel LVDS receiver.

Two separate EVMs are available, allowing each LVDS device to be tested

individually using a single EVM for that device. If both EVMs are used, the

LVDS output signals from the SN65LVDS387EVM 16-channel LVDS driver

can be connected to the LVDS inputs of the 16-channel LVDS receiver on the

SN65LVDS386EVM. This allows users to simulate performance of an LVDS

system. Recommended test equipment and evaluation and interconnect

guidelines are provided for both 16-channel point-to-point and multidrop

configurations. The EVMs are CE compliant for distribution within the

European Community.

How to Use This Manual

This document contains the following chapters:

Chapter 1 – Introduction

Chapter 2 – The Evaluation Boards

Chapter 3 – Equipment Required

Chapter 4 – Operation

Appendix A – Parts List and Schematics

Trademarks

BergStick is a registered trademark of Berg Electronics. All other trademarks

are the property of their respective owners.

Running Title—Attribute Reference

Chapter Title—Attribute Reference

Contents

1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 The Evaluation Boards 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.1 SN65LVDS387 16-Channel LVDS Line Driver 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.2 SN65LVDS386 16-Channel LVDS Line Receiver 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Equipment Required 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Pattern Generator 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Oscilloscope and Scope Probes 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Power Supply 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Cables 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Operation 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 SN65LVDS387 Operation 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 SN65LVDS386 Operation 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 System Evaluation Using Both the SN65LVDS387EVM and SN65LVDS386EVM 4-3. . . .

4.3.1 Point-to-Point Configuration 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3.2 Multidrop Configuration 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 References 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A Parts List and Schematics A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.1 Parts List for EVMs A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

A.2 Schematic Diagrams 6420201 and 6420202 A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference

Figures

2–1. EVM Simplified I/O Block Diagram 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–2. SN65LVDS387EVM 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2–3. SN65LVDS386EVM 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4–1. Examples of Multidrop Interconnections 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

Introduction

Thisistheuser’sguidefortheevaluationmodules(EVMs)fortheTexasInstru-

ments’ SN65LVDS387EVM 16-channel LVDS driver EVM and the

SN65LVDS386EVM16-channelLVDS receiver EVM. One manual is used for

both EVMs because the boards are similar for both devices. The EVMs are

CE-compliant for distribution within the European Community.

Low-voltage differential signaling (LVDS), as documented in TIA/EIA-644, is

a balanced signaling method used for high-speed transmission of binary data

over copper. It is well recognized that the benefits of balanced-data transmis-

sion begin to outweigh the cost advantages of single-ended techniques when

signal-transition times approach 10 nS. This represents signaling rates ap-

proaching 30 Megabits per second (Mbps) Presently, LVDS devices operate

with signaling rates in the hundreds of Mbps. This performance is achieved

with reduced power consumption and reduced electromagnetic interference

(EMI) emissions compared to other data transmission standards, such as

TIA/EIA–422 and TIA/EIA–232 (also known as RS–232 and RS–422, respec-

tively), PECL, etc. Project collateral discussed in this user’s guide can be

downloaded from the following URL: http://www.ti.com/lit/zip/SLLU013.

Note: To Designers

Both EVMs use the same printed-wiring board (PWB). The 387 device is

mounted with the device’s pin 1 facing the top of the PWB, and the 386 is

mounted with the device’s pin 1 facing the bottom of the PWB.

Chapter 1

2-1

The Evaluation Boards

Each EVM consists of a six-layer printed-wiring board (PWB). The LVDS

device and BergStickconnectors are on the top (connector side) of the

board. All other passive components are installed on the underside

(component side) of the PWB. A simplified input/output (I/O) block diagram of

the EVM is shown in Figure 2–1.

Topic Page

2.1 SN65LVDS387 16-Channel LVDS Line Driver 2-3. . . . . . . . . . . . . . . . . . . .

2.2 SN65LVDS386 16-Channel LVDS Line Receiver 2-5. . . . . . . . . . . . . . . . . .

Chapter 2

2-2

Figure 2–1.EVM Simplified I/O Block Diagram

LVTTL Input

Connector

A1A

LVDS387EVM

EN_A

LVDS Output

Connector

A1Z

A1Y

A2A A2Z

A2Y

A3A A3Z

A3Y

A4A A4Z

A4Y

LVDS Driver

(1 of 4)

LVTTL Output

Connector

D4Y

LVDS386EVM

LVDS Input

Connector

D4B

D3Y

D2Y

D1Y

LVDS Receiver

(1 of 4)

VCC GND VCC GND

D4A

EN_A

D3B

D3A

D2B

D2A

D1B

D1A

51 100

The SN65LVDS387EVM and the SN65LVDS386EVM are discussed in sec-

tions 2.1 and 2.2. Use of the schematics in Appendix A will facilitate under-

standing the detailed discussion that follows.

SN65LVDS387 16-Channel LVDS Line Driver

2-3

The Evaluation Boards

2.1 SN65LVDS387 16-Channel LVDS Line Driver

This 16-channel LVDS driver accepts 16 low-voltage TTL (LVTTL) inputs and

generates 16 LVDS differential outputs (please refer to the schematic in

AppendixI).Connectors P1/P2are theLVTTLI/O connectors.Connectors P3

through P7 are the LVDS I/O connectors. The LVTTL inputs can be provided

by any suitable source. As shipped, the SN65LVDS387EVM has 50-Ω

termination resistors (R33 through R48) installed on each LVTTL input line to

accommodate inputs from a pattern generator or other instrumentation that

has a 50-Ωsource impedance. If the LVTTL source and cable being used is

not a 50-Ωsource, then these resistors (resistors R33 through R48) need to

be removed. They are required to match the characteristic impedance of the

cable(andthesourceimpedanceofmostpatterngenerators).Theseresistors

are located on the back (under) side of the SN65LVDS386EVM, next to the

P1/P2 connector row.

The other optional components are resistors R1 through R32. Resistors R1

through R16 are left open on the SN65LVDS387EVM. These are used in the

LVDSoutputcircuitand, sinceLVDSlinesare normallyterminatedattheinput

to the receiver, these 100-Ωresistors are not installed on the EVM. If users

want to measure specific performance parameters on the ’387, then they are

responsible for installing 100-ohm resistors in R1 through R16. Zero-ohm

resistors are installed in R17 through R32, which are in series with the LVTTL

inputs to the SN65LVDS387. The remaining components are connectors for

Vcc and Gnd connections, and decoupling capacitors for the LVDS device.

These components are the same for both configurations of the EVM.

There are also four jumpers (JMP1 through JMP4 ) located next to the P1/P2

connector row. These jumpers control the enable and disable for each four-

channel (quad) section of the device. Each of these jumpers consist of three

pinsandajumpershort.Thecenterpinisconnectedtothedeviceandtheout-

er pins (top and bottom) are VCC and GND. The jumper short can be moved

socontactismadebetweenVCC andtheenable/disablepin,orbetweenGND

and the enable/disable pin. As shipped, the four jumper shorts are installed to

VCC so that all four sections of the device are enabled. A photograph of the

SN65LVDS387EVM is shown is Figure 2–2.

SN65LVDS387 16-Channel LVDS Line Driver

2-4

Figure 2–2.SN65LVDS387EVM

LVTTL

Input Pins

Connector (Top) Side Component (Bottom) Side

GND Enable/Disable

Jumpers LVDS

Output Pins

VCC

SN65LVDS386 16-Channel LVDS Line Receiver

2-5

The Evaluation Boards

2.2 SN65LVDS386 16-Channel LVDS Line Receiver

The SN65LVDS386EVM accepts 16 LVDS inputs and generates 16 LVTTL

outputs (refer to the schematic in Appendix I). Connectors P3 through P7

(right-sideedge)acceptthedifferentialLVDSinputsandconnectorP1/P2pro-

vides the LVTTL output signals. The

as shipped

configuration of the

SN65LVDS386EVMalsocontainsexternalresistorsrequiredforbasicopera-

tion and testing of the device. Resistors R1 through R16 are 100-Ωresistors

which terminate each LVDS input channel. These are installed on the under-

side of the SN65LVDS386EVM, very close to the input pins of the device.

TheLVTTL output-channelspath (etchon the PWB)contains two

pads

where

external resistors may be installed. Resistors R17 through R32 are series re-

sistorswherezero-ohmresistorsarenormallyinstalled.Thesearefollowedby

resistors R33 through R48, which allow a pull-down resistor to be installed af-

ter the series resistor (R17 through R32). As shipped, these pull-down resis-

tors are not installed. The combination of these series (R17 through R32) and

pull-down resistors (R 33 through R48) allow the user to install a divider net-

workifdesired.Thismightbenecessaryiftheoutputsaretobemeasuredwith

aninstrument havinga50-Ωinputimpedance. Byinstallinga 475-Ωseriesre-

sistor and a 50-Ωpull down resistor, a 20:1 divider is created (the 50-Ωpull-

down in parallel with the 50-Ωinput impedance equals 25 Ω, plus the 475-Ω

series impedance of the instrument, for a total load of 500 Ωon the output of

thereceiver).Asshipped,thereisnoresistordividerinstalled,andeachdevice

LVTTLoutputis routeddirectly totheP1/P2connectors througha0-Ωresistor

(R17 through R32).

The remaining components are connectors for VCC and GND connections,

and decoupling capacitors for the LVDS device (these components are the

same for both EVM configurations).

There are also four jumpers (JMP1 through JMP4 ) located next to the P1/P2

connector row. These jumpers control the enable/disable for each four-chan-

nel (quad) section of the device. Each of these jumpers consist of three pins

and a jumper short. The center pin is connected to the device and the outer

pins (top and bottom) are VCC and GND. The jumper short can be moved so

contact is made between VCC and the enable/disable pin, or between GND

andtheenable/disable pin.As shipped,the jumpershortsareinstalled toVCC

so that all four sections of the device are enabled.

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