MCP661
Line Driver
Demo Board
User’s Guide
© 2009 Microchip Technology Inc.
DS51868A
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.”
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products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
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Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
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rfPIC and UNI/O are registered trademarks of Microchip
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Analog-for-the-Digital Age, Application Maestro, CodeGuard,
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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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Endurance, TSHARC, WiperLock and ZENA are trademarks
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© 2009, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
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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.
DS51868A-page 2
© 2009 Microchip Technology Inc.
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
© 2009 Microchip Technology Inc.
DS51868A-page 3
MCP661 Line Driver Demo Board User’s Guide
NOTES:
DS51868A-page 4
© 2009 Microchip Technology Inc.
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® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
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.
© 2009 Microchip Technology Inc.
DS51868A-page 5
MCP661 Line Driver Demo Board User’s Guide
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
DS51868A-page 6
Examples
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
© 2009 Microchip Technology Inc.
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, “60 MHz, 6 mA Op Amps”, (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.
© 2009 Microchip Technology Inc.
DS51868A-page 7
MCP661 Line Driver Demo Board User’s Guide
NOTES:
DS51868A-page 8
© 2009 Microchip Technology Inc.
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:
© 2009 Microchip Technology Inc.
MCP661 Line Driver Demo Board Kit Contents.
DS51868A-page 9
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 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.
VIN
(50Ω Source)
U1
MCP661
50Ω
TX Line
R3
49.9Ω
R4
124Ω
R5
301Ω
FIGURE 1-2:
50Ω
TX Line
R7
49.9Ω
VOUT
(50Ω Load)
R6
301Ω
Simplified Circuit Diagram.
The 50Ω source drives the matched 50Ω transmission line at the input; R3 provides this
match. Thus, the input transmission line can be treated as a simple connection for
circuit analysis (ignoring the time delay).
R4 provides 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 (R7 and the Load
attenuate the signal by 0.5 V/V). U1’s large output current makes it possible to drive the
back-matched output transmission line (R7, the 50Ω line and the 50Ω load 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 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).
DS51868A-page 10
© 2009 Microchip Technology Inc.
Product Overview
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. C1 and C2
provide the bulk bypassing, while C3 and C4 provide the local bypassing, for U1
(MCP661).
VDDX
(+2.5V)
C3
100 nF
R1
1.0Ω
C1
10 µF
GND
(0V)
VSSX
(-2.5V)
FIGURE 1-3:
1.4.3
U1
MCP661
C2
10 µF
R2
1.0Ω
C4
100 nF
Power Supply.
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 (R3 and R7 in Figure 1-2). They are 100 mils (2.54 mm) wide, which
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 parasitic capacitance
issues).
© 2009 Microchip Technology Inc.
DS51868A-page 11
MCP661 Line Driver Demo Board User’s Guide
NOTES:
DS51868A-page 12
© 2009 Microchip Technology Inc.
MCP661 LINE DRIVER DEMO
BOARD USER’S GUIDE
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 generator, network analyzer, spectrum analyzer, 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 MHz bandwidth
© 2009 Microchip Technology Inc.
DS51868A-page 13
MCP661 Line Driver Demo Board User’s Guide
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.
1
2
3
FIGURE 2-1:
Lab Equipment Connections.
The arrows and numbers in the drawing signify the following:
1. BNC Recepticle for VIN.
2. BNC Recepticle for VOUT.
3. ±2.5V Power Supplies, with GND, for U1 (MCP661).
a) VDDX = +2.5V.
b) GND = 0V.
c) VSSX = -2.5V.
DS51868A-page 14
© 2009 Microchip Technology Inc.
MCP661 LINE DRIVER DEMO
BOARD USER’S GUIDE
Appendix A. Schematics and Layouts
A.1
INTRODUCTION
This appendix contains the schematic and layouts for 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”.
© 2009 Microchip Technology Inc.
DS51868A-page 15
MCP661 Line Driver Demo Board User’s Guide
BOARD – SCHEMATIC
M
A.2
DS51868A-page 16
© 2009 Microchip Technology Inc.
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
© 2009 Microchip Technology Inc.
DS51868A-page 17
MCP661 Line Driver Demo Board User’s Guide
A.5
BOARD – BOTTOM METAL LAYER (TOP VIEW)
A.6
BOARD – BOTTOM METAL LAYER (BOTTOM VIEW)
DS51868A-page 18
© 2009 Microchip Technology Inc.
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
Reference
Designator
Qty.
Description
Manufacturer
Part Number
2
C3, C4
100 nF, 0603 SMD, X7R, 16V, 10%
Panasonic®-ECG
ECJ-1VB1C104K
2
C1, C2
10 µF, 1206 SMD, X7R, 16V, 10%
Panasonic-ECG
ECJ-3YX1C106K
2
P1, P2
BNC Recepticle, 50Ω, Top Mount (1) Amphenol
031-5329-52RFX
2
R3, R7
49.9Ω, 0603 SMD, 1%, 1/10W
Yageo®
1
R4
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®
5016
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,
0.44 in × 0.20 in
3M
SJ-5003 (BLACK)
Note 1:
2:
These are mounted on the side to reduce strain on the cables in the lab.
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.
TABLE B-2:
BILL OF MATERIALS FOR ALTERNATE COMPONENTS
Reference
Designator
Qty.
RC0603FR-0749R9L
Description
Manufacturer
Part Number
0
(for PCB mounting) Stand-off, Hex, 0.500", 4 × 40 Thread, Nylon, Keystone
0.285" max. O.D.
Electronics
1902C
0
(for PCB mounting) Machine Screw, Phillips, 4 × 40 Thread,
1/4" long, Nylon
NY PMS 440 0025 PH
Note 1:
Building
Fasteners
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.
© 2009 Microchip Technology Inc.
DS51868A-page 19
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03/26/09
DS51868A-page 20
© 2009 Microchip Technology Inc.