Microchip Technology MCP661 Manuale utente

MCP661

Line Driver

Demo Board

User’s Guide

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

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OTHERWISE, RELATED TO THE INFORMATION,

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suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

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ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial

Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code

Generation, PICC, PICC-18, PICkit, PICDEM, PICDEM.net,

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Printed on recycled paper.

Note the following details of the code protection feature on Microchip devices:

• Microchip products meet the specification contained in their particular Microchip Data Sheet.

• Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

• Microchip is willing to work with the customer who is concerned about the integrity of their code.

• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Microchip received ISO/TS-16949:2002 certification for its worldwide

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and India. The Company’s quality system processes and procedures

are for its PIC®MCUs and dsPIC®DSCs, KEELOQ®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

MCP661 LINE DRIVER DEMO

BOARD USER’S GUIDE

Table of Contents

Preface ...........................................................................................................................1

Introduction............................................................................................................1

Document Layout..................................................................................................1

Conventions Used in this Guide............................................................................2

Recommended Reading........................................................................................3

The Microchip Web Site........................................................................................3

Customer Support.................................................................................................3

Document Revision History...................................................................................3

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................5

1.2 Kit Contents ....................................................................................................5

1.3 Intended Use ..................................................................................................6

1.4 Description .....................................................................................................6

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................9

2.2 Required Tools ...............................................................................................9

2.3 Configuring the Lab Equipment and PCB .................................................... 10

Appendix A. Schematics and Layouts

A.1 Introduction ..................................................................................................11

A.2 Board – Schematic .......................................................................................12

A.3 Board – Top Silk Screen, Top Solder Mask and Top Metal ....................13

A.4 Board – Top Silk Screen and Top Solder Mask ...........................................13

A.5 Board – Bottom Metal Layer (Top View) ......................................................14

A.6 Board – Bottom Metal Layer (Bottom View) .................................................14

Appendix B. Bill Of Materials (BOM)

B.1 MCP661 Line Driver Demo Board BOM ......................................................15

Worldwide Sales and Service ....................................................................................16

MCP661 Line Driver Demo Board User’s Guide

NOTES:

MCP661 LINE DRIVER DEMO

BOARD USER’S GUIDE

Preface

INTRODUCTION

This chapter contains general information that will be useful to know before using the

MCP661 Line Driver Demo Board. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP661 Line Driver Demo Board. The

manual layout is as follows:

•Chapter 1. “Product Overview” - Important information about the MCP661 Line

Driver Demo Board.

•Chapter 2. “Installation and Operation” – Covers the initial set-up of the

MCP661 Line Driver Demo Board. It lists the required tools, shows how to set up

the board and how to connect lab equipment. It then demonstrates how to use this

board.

•Appendix A. “Schematics and Layouts” – Shows the schematic and board

layouts for the MCP661 Line Driver Demo Board.

•Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to populate the

MCP661 Line Driver Demo Board. Also lists alternate components.

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and

documentation are constantly evolving to meet customer needs, so some actual dialogs

and/or tool descriptions may differ from those in this document. Please refer to our web site

(www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each

page, in front of the page number. The numbering convention for the DS number is

“DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the

document.

For the most up-to-date information on development tools, see the MPLAB®IDE on-line help.

Select the Help menu, and then Topics to open a list of available on-line help files.

MCP661 Line Driver Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB®IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog “Save project before build”

Underlined, italic text with

right angle bracket A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-line options -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

Italic Courier New A variable argument file.o, where file can be

any valid filename

Square brackets [ ] Optional arguments mcc18 [options] file

[options]

Curly brackets and pipe

character: { | } Choice of mutually exclusive

arguments; an OR selection errorlevel {0|1}

Ellipses... Replaces repeated text var_name [,

var_name...]

Represents code supplied by

user void main (void)

{ ...

}

Preface

RECOMMENDED READING

This user's guide describes how to use MCP661 Line Driver Demo Board. Other useful

documents are listed below. The following Microchip documents are available and

recommended as supplemental reference resources.

MCP661/2/3/5 Data Sheet, “60MHz,6mAOpAmps”, (DS22194)

Gives detailed information on the op amp family that is used as the DUT on the

MCP661 Line Driver Demo Board.

THE MICROCHIP WEB SITE

Microchip provides online support via our web site at www.microchip.com. This web

site is used as a means to make files and information easily available to customers.

Accessible by using your favorite Internet browser, the web site contains the following

information:

•Product Support – Data sheets and errata, application notes and sample

programs, design resources, user’s guides and hardware support documents,

latest software releases and archived software

•General Technical Support – Frequently Asked Questions (FAQs), technical

support requests, online discussion groups, Microchip consultant program

member listing

•Business of Microchip – Product selector and ordering guides, latest Microchip

press releases, listing of seminars and events, listings of Microchip sales offices,

distributors and factory representatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

Customers should contact their distributor, representative or field application engineer

for support. Local sales offices are also available to help customers. A listing of sales

offices and locations is included in the back of this document.

Technical support is available through the web site at: http://support.microchip.com

DOCUMENT REVISION HISTORY

Revision A (November 2009)

• Initial Release of this Document.

MCP661 Line Driver Demo Board User’s Guide

NOTES:

MCP661 LINE DRIVER DEMO

BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP661 Line Driver Demo Board is described by the following:

• Assembly # : 114-00270-R1

• Order # : MCP661DM-LD

• Name: MCP661 Line Driver Demo Board

Items discussed in this chapter include:

• Kit Contents

• Intended Use

• Description

1.2 KIT CONTENTS

• Assembled printed circuit board, 102-00270

• Important Information “Read First”

FIGURE 1-1: MCP661 Line Driver Demo Board Kit Contents.

MCP661 Line Driver Demo Board User’s Guide

1.3 INTENDED USE

The MCP661 Line Driver Demo Board shows the MCP661 used in a very basic

application for high speed op amps; a 50Ωline (coax) driver. It gives:

• A 30 MHz solution

• High speed PCB layout techniques

• A means to test AC response, step response and distortion

The application circuit implemented on this PCB is discussed briefly in the

MCP661/2/3/5 data sheet’s application circuit section.

1.4 DESCRIPTION

1.4.1 Simplified Circuit

Figure 1-2 shows a simplified circuit diagram of the MCP661 Line Driver Demo Board.

Details of the power supply and connectors have been left out.

FIGURE 1-2: Simplified Circuit Diagram.

The50Ωsourcedrivesthe matched 50Ωtransmission lineat the input; R3providesthis

match. Thus, the input transmission line can be treated as a simple connection for

circuit analysis (ignoring the time delay).

R4provides matched input resistances for U1’s inputs. It also set a pole around

100 MHz, since U1’s CCM is about 9 pF.

U1(MCP661) is set at a gain of 2 V/V so that the overall gain is 1 V/V (R7and theLoad

attenuate the signalby 0.5 V/V). U1’s large output current makes it possible to drive the

back-matched output transmission line (R7, the 50Ωline and the 50Ωload at the far

end) to more than ±2V (the load at the far end sees ±1V).

U1’s output headroom limits would be VOL = -2.3V and VOH = +2.3V, leaving some

design room for the ±2V signal. The open-loop gain (AOL) typically does not decrease

significantly with a 100Ωload. The maximum power dissipated by the op amp is about

48 mW, so the temperature rise (for the MCP661 in the SOIC-8 package) is under 8°C.

The output transmision line can be treated as a simple connection for circuit analysis

(ignoring the time delay).

301Ω

49.9ΩR7

49.9Ω

50Ω

TX Line VOUT

(50ΩLoad)

VIN

(50ΩSource)

50Ω

TX Line

MCP661

124Ω

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