Microchip Technology MCP661 Line Driver Demo Board User guide

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MCP661

Line Driver

Demo Board

User’s Guide

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

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

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

IDE on-line help.

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 Lin e Driver Dem o Boar d. 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 equipmen t. It then demonstrates ho w 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.

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

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

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

Courier New font:

Plain Courier New Sample source code #define START

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

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

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

Preface

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:

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”

MCP661 LINE DRIVER DEMO

BOARD USER ’S GUIDE

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

MCP661 Line Driver Demo Board User’s Guide

301Ω

49.9Ω

50Ω

TX Line

OUT

(50Ω Load)

(50Ω Source)

50Ω

TX Line

MCP661

124Ω

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 50Ω line (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.

The 50Ω source drives the matched 50Ω transmission line at the input; R

provides this

match. Thus, the input transmission line can be treated as a simple connection for circuit analysis (ignoring the time delay).

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

100 MHz, since U U

(MCP661) is set at a gain of 2 V/V so that the overall gain is 1 V/V (R7 and the Load

attenuate the signal by 0.5 V/V). U back-matched output transmission line (R

’s CCM is about 9 pF.

’s large output current makes it possible to drive the

, the 50Ω line and the 50Ω load at the far

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

’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 (A

) typically does not decrease

significantly with a 100Ω load. 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).

Product Overview

DDX

(+2.5V)

GND

(0V)

SSX

(-2.5V)

1.0Ω

10 µF

MCP661

100 nF

1.4.2 Power Supply

Figure 1-3 shows the power supply circuitry. R1 and R2 provide high frequency isolation of the supply lines. They also help with series resonances in the supplies. C provide the bulk bypassing, while C

and C4 provide the local bypassing, for U1

(MCP661).

FIGURE 1-3: Power Supply.

and C2

1.4.3 Connectors and Transmission Lines

The power supplies use surface mount test points to connect to the lab supplies. The signal input and output are connected via BNC recepticles (and coax cables) to 50Ω lab equipment.

The PCB has two 50Ω transmission lines between the BNC recepticles and the matching resistors (R is a value commonly used for standard FR4 PCBs with only two layers. These lines are as long as possible; they end at the matching resistors (to avoid pa rasitic cap acit an ce issues).

and R7 in Figure 1-2). They are 100 mils (2.54 mm) wide, which

MCP661 Line Driver Demo Board User’s Guide

NOTES:

Chapter 2. Installation and Operation

2.1 INTRODUCTION

This chapter shows how to set up and operate the MCP661 Line Driver Demo Board. Items discussed in this chapter include:

• Required Tools

• Configuring the Lab Equipment and PCB

2.2 REQUIRED TOOLS

• Lab Power Supply with dual outputs (one tracks the other):

- For +2.5V, 0V and -2.5V

• Sine Wave Source (function gener ator, network analyzer, spectrum ana lyze r, etc):

- Sine wave output to 100 MHz, or so

-50Ω output impedance

- -2.5V to +2.5V minimum range

• Signal Analyzer (oscilloscope, network analyzer, spectrum analyzer, etc):

-50Ω input impedance

- At least 100 M Hz bandwidth

MCP661 LINE DRIVER DEMO

BOARD USER ’S GUIDE

MCP661 Line Driver Demo Board User’s Guide

1 2

2.3 CONFIGURING THE LAB EQUIPMENT AND PCB

Lab equipment is connected to this board as shown in Figure 2-1. The BNC recepticles and (surface mount) test points allow lab equipment to be connected to these boards.

FIGURE 2-1: Lab Equipment Connections.

The arrows and numbers in the drawing signify the following:

1. BNC Recepticle for V

2. BNC Recepticle for V

3. ±2.5V Power Supplies, with GND, for U1 (MCP661). a) VDDX = +2.5V. b) GND = 0V. c) VSSX = -2.5V.

IN OUT

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

This appendix contains the schematic and layouts fo r the MCP661 Line Driver Demo Board.

•Board – Schematic

•Board – Top Silk Screen, Top Solder Mask and Top Metal

•Board – Top Silk Screen and Top Solder Mask

•Board – Bottom Metal (Top View)

•Board – Bottom Metal (Bottom View) The Gerber files for this board are available on the Microchip website

(www.microchip.com) and are contained in the zip file “00270R1_Gerbers.zip”.

MCP661 LINE DRIVER DEMO

BOARD USER ’S GUIDE

MCP661 Line Driver Demo Board User’s Guide

A.2 BOARD – SCHEMATIC

Schematics and Layouts

A.3 BOARD – TOP SILK SCREEN, TOP SOLDER MASK AND TOP METAL

A.4 BOARD – TOP SILK SCREEN AND TOP SOLDER MASK

MCP661 Line Driver Demo Board User’s Guide

A.5 BOARD – BOTTOM METAL LAYER (TOP VIEW)

A.6 BOARD – BOTTOM METAL LAYER (BOTTOM VIEW)

MCP661 LINE DRIVER DEMO

BOARD USER ’S GUIDE

Appendix B. Bill Of Materials (BOM)

B.1 MCP661 LINE DRIVER DEMO BOARD BOM

The BOM in Table B-1 shows all of the components assembled on the PCB. Table B-2 shows alternate components that can be placed on this PCB (after modification).

TABLE B-1: BILL OF MATERIALS FOR ASSEMBLED PCB

Qty.

2 C3, C4 100 nF, 0603 SMD, X7R, 16V, 10% Panaso nic 2 C1, C2 10 µF, 1206 SMD, X7R, 16V, 10% Panasonic-ECG ECJ-3YX1C106K 2 P1, P2 BNC Recepticle, 50Ω, Top Mount ( 2 R3, R7 49.9Ω, 0603 SMD, 1%, 1/10W Yageo 1R4 124Ω, 0603 SMD, 1%, 1/10W Yageo RC0603FR-07124RL 2 R5, R6 301Ω, 0603 SMD, 1%, 1/10W Yageo RC0603FR-07301RL 2 R1, R2 1.0Ω, 0603 SMD, 5%, 1/10W Yageo RC0603JR-071RL 3 TP1 – TP3 SMD, Test Point Keystone Electronics 1 U1 MCP661, SOIC-8, Single Op Amp Microchip Technology Inc. MCP661-E/SN 1 PCB 2 layer PCB (2.23 in × 1.50 in) Microchip Technology Inc. 102-00270 4 (for PCB mounting) Hemispherical Bumpon Standoff,

Note 1: These are mounted on the side to reduc e strain on the cables in the lab.

Reference

Designator

0.44 in × 0.20 in

2: The components listed in this Bill of Materials are representative of the PCB assembly . The released BOM

used in manufacturing uses all RoHS-compliant components.

Description Manufacturer Part Number

-ECG ECJ-1VB1C104K

) Amphenol 031-5329-52RFX

3M SJ-5003 (BLACK)

RC0603FR-0749R9L

5016

TABLE B-2: BILL OF MATERIALS FOR ALTERNATE COMPONENTS

Qty.

0 (for PCB mounting) Stand-off, Hex, 0.500", 4 × 40 Thread, Nylon,

0 (for PCB mounting) Machine Screw, Phillips, 4 × 40 Thread,

Note 1: The components listed in this Bill of Materials are representative of the PCB assembly . The released BOM

Reference

Designator

0.285" max. O.D.

1/4" long, Nylon

used in manufacturing uses all RoHS-compliant components.

Description Manufacturer Part Number

Keystone Electronics

Building Fasteners

1902C

NY PMS 440 0025 PH

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Corporate Office

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UK - Wokingham

Tel: 44-118-921-5869 Fax: 44-118-921-5820

03/26/09

Microchip Technology MCP661 Line Driver Demo Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

INTRODUCTION

DOCUMENT LAYOUT

CONVENTIONS USED IN THIS GUIDE

RECOMMENDED READING

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

DOCUMENT REVISION HISTORY

Chapter 1. Product Overview

1.1 INTRODUCTION

1.2 KIT CONTENTS

1.3 INTENDED USE

1.4 DESCRIPTION

Chapter 2. Installation and Operation

2.1 INTRODUCTION

2.2 REQUIRED TOOLS

2.3 CONFIGURING THE LAB EQUIPMENT AND PCB

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

A.2 BOARD – SCHEMATIC

A.3 BOARD – TOP SILK SCREEN, TOP SOLDER MASK AND TOP METAL

A.4 BOARD – TOP SILK SCREEN AND TOP SOLDER MASK

A.5 BOARD – BOTTOM METAL LAYER (TOP VIEW)

A.6 BOARD – BOTTOM METAL LAYER (BOTTOM VIEW)

Appendix B. Bill Of Materials (BOM)

B.1 MCP661 LINE DRIVER DEMO BOARD BOM