Microchip Technology MCP651 Bedienungsanleitung

MCP651

Input Offset

Evaluation Board

User’s Guide

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MCP651 INPUT OFFSET

EVALUATION 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 ................................................................................... 4

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 ................................................................................................... 11

2.2 Required Tools ............................................................................................. 11

2.3 Configuring the Lab Equipment and PCB .................................................... 12

2.4 Operating Conditions .................................................................................... 14

2.5 Converting to Other Parameters .................................................................. 15

2.6 Settling Time, Noise and Sampling Rate ...................................................... 17

Chapter 3. Possible Modifications

3.1 Introduction ................................................................................................... 19

3.2 Range of Parts Supported by MCP651 Input Offset Evaluation Board ........ 19

3.3 Changes to Accommodate Other DUTs ....................................................... 21

Appendix A. Schematics and Layouts

A.1 Introduction .................................................................................................. 25

A.2 Schematic and Layouts ................................................................................ 25

A.3 Board – Schematic ....................................................................................... 26

A.4 Board – Combination of the Top Silk Screen, Top Solder Mask and Top Metal

Layers ..................................................................................................... 27

A.5 Board – Top Silk Screen .............................................................................. 28

A.6 Board – Top Solder Mask and Top Metal Layer .......................................... 29

A.7 Board – Bottom Metal Layer ........................................................................ 30

MCP651 Input Offset Evaluation Board User’s Guide

Appendix B. Bill Of Materials (BOM)

B.1 MCP651 Input Offset Evaluation Board BOM .............................................. 31

B.2 Adaptor Board BOM ..................................................................................... 33

Worldwide Sales and Service .....................................................................................34

MCP651 INPUT OFFSET

EVALUATION BOARD

USER’S GUIDE

Preface

INTRODUCTION

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

MCP651 Input Offset Evaluation 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 MCP651 Input Offset Evaluation Board. The

manual layout is as follows:

•Chapter 1. “Product Overview” - Important information about the MCP651 Input

Offset Evaluation Board.

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

MCP651 Input Offset Evaluation 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.

•Chapter 3. “Possible Modifications” – Shows how to modify the board for other

single Microchip op amps in SOIC-8, PDIP-8 and other packages.

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

layouts for the MCP651 Input Offset Evaluation Board.

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

MCP651 Input Offset Evaluation Board. Also lists loose parts shipped with the

board in an ESD bag, alternate components and components not populated.

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.

MCP651 Input Offset Evaluation 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 MCP651 Input Offset Evaluation Board. Other

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

and recommended as supplemental reference resources.

MCP6V01/2/3 Data Sheet, “300 µA, Auto-Zeroed Op Amps”, DS22058

Gives detailed information on the op amp family that is used for signal processing and

output voltage control on the MCP651 Input Offset Evaluation Board.

MCP651 Data Sheet, “5 mA Op Amps with mCal”, DS22146

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

MCP651 Input Offset Evaluation Board.

AN1177 Application Note, “Op Amp Precision Design: DC Errors”, DS01177

Discusses how to achieve high DC accuracy in op amp circuits. Also discusses the

relationship between an op amp’s input offset voltage (VOS), CMRR, PSRR,

Open-Loop Gain and VOS Drift over Temperature.

AN1258 Application Note, “Op Amp Precision Design: PCB Layout Techniques”,

DS01258

Discusses how to lay out PCBs for high DC accuracy in op amp circuits. Also discusses

other PCB related accuracy issues.

8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board User’s Guide, DS51544

Covers the usage of the SOIC8EV Evaluation 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

MCP651 Input Offset Evaluation Board User’s Guide

DOCUMENT REVISION HISTORY

Revision A (May 2009)

• Initial Release of this Document.

MCP651 INPUT OFFSET

EVALUATION BOARD

USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP651 Input Offset Evaluation Board is described by the following:

• Assembly # : 102-00258-R2

• Order # : MCP651EV-VOS

• Name: MCP651 Input Offset Evaluation Board

Items discussed in this chapter include:

• Kit Contents

• Intended Use

• Description

1.2 KIT CONTENTS

• One MCP651 Input Offset Evaluation Board, 102-00258-R2

• Important Information “Read First”

FIGURE 1-1: MCP651 Input Offset Evaluation Board Kit Contents.

MCP651 Input Offset Evaluation Board User’s Guide

1.3 INTENDED USE

The MCP651 Input Offset Evaluation Board is intended to provide a simple means to

measure the MCP651 Input Offset Evaluation Board op amp’s input offset voltage

under a variety of operating conditions. The measured input offset voltage (VOST)

includes the input offset voltage specified in the data sheet (VOS) plus changes due to:

power supply voltage (PSRR), common mode voltage (CMRR), output voltage (AOL),

input offset voltage drift over temperature (ΔVOS/ΔTA) and 1/f noise.

The MCP651 Input Offset Evaluation Board works most effectively at room tempera-

ture (near 25°C). Measurements at other temperatures should be done in an oven

where the air velocity is minimal.

1.4 DESCRIPTION

This section starts with the conversion of DUT bias voltages described in the MCP651

data sheet to the voltages on this board. Then there is a discussion of the circuitry that

controls the DUT’s output voltage (VOUTX) and amplifies its total input offset voltage

(VOST). Finally, other portions of the circuit, and their purpose, are discussed. Complete

details of this board are given in Appendix A. “Schematics and Layouts” and

Appendix B. “Bill Of Materials (BOM)”.

1.4.1 Conversion of Bias Voltages

The MCP651 data sheet describes all of its bias voltages relative to VSS, which is

assumed to be at ground (0V). On the other hand, the MCP651 Input Offset Evaluation

Board sets the DUT’s input common mode voltage to 0V. The user needs to convert

from the first set of voltages to the second set (by subtracting VCM):

TABLE 1-1: CONVERSION OF BIAS VOLTAGES

The supply voltages VDDX and VSSX can be estimated using the MCP651’s typical

quiescent current (IQ=6mA):

EQUATION 1-1:

Data Sheet Bias Voltage

(V) Conversion Equations Evaluation Board Bias Voltage

(V)

VCM VCM – VCM VCMX =0V

VDD VDD – VCM VDDI

VSS VSS – VCM VSSI

VOUT VOUT – VCM VOUTX

VLVL– VCM VLX

VCAL VCAL – VCM VCALX

VDDX VDDI IQ10

()+V

DDI 60 mV+

≈

VSSX VSSI IQ10

()–VSSI 60 mV–

≈

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