Microchip Technology MCP651 Input Offset Evaluation Board User guide

Download

MCP651

Input Offset

Evaluation Board

User’s Guide

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.

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in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates.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. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron, dsPIC, K

EELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTART, rfPIC, SmartShunt and UNI/O are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

FilterLab, Hampshire, Linear Active Thermistor, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN, ECONOMONITOR, FanSense, In-Circuit Serial Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo, MPLIB, MPLINK, mTouch, nanoWatt XLP, PICkit, PICDEM, PICDEM.net, PICtail, PIC

logo, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total Endurance, TSHARC, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.

SQTP is a service mark of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC 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.

MCUs and dsPIC® DSCs, KEELOQ

code hopping

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

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 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.

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

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

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.

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”

MCP651 INPUT OFFSET

EVALUATION BOARD

USER’S GUIDE

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

MCP651 Input Offset Evaluation Board User’s Guide

DDX

DDIIQ

10Ω()+V

DDI

60 mV+

≈

SSX

SSIIQ

10Ω()– V

SSI

60 mV–

≈

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 (V includes the input offset voltage specified in the data sheet (V power supply voltage (PSRR), common mode voltage (CMRR), output voltage (A input offset voltage drift over temperature (ΔV

The MCP651 Input Offset Evaluation Board works most effectively at room temperature (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 (V (V

OST

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

) plus changes due to:

/ΔTA) and 1/f noise.

) and amplifies its total input offset voltage

OUTX

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

OST

)

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 V

TABLE 1-1: CONVERSION OF BIAS VOLTAGES

Data Sheet Bias Voltage

(V)

OUT

CAL

The supply voltages V quiescent current (I

Conversion Equations

and V

DDX

=6mA):

VCM – V VDD – V

VSS – V

SSX

– V

OUT

VL – V

CAL

– V

can be estimated using the MCP651’s typical

Evaluation Board Bias Voltage

(V)

=0V

CMX

DDI

SSI

OUTX

CALX

EQUATION 1-1:

Product Overview

DUT

OUTX

CMX

=0V

Integrator

1/G

INT

(ω

INT

/s)

DDI

SSI

1/G

INT

+2.5V

-2.5V

+2.5V

-2.5V

COX

+2.5V

-2.5V

Lowpass

Filter

1.4.2 Simplified Circuit and Operation

Figure 1-2 is a simplified diagram of the circuitry that biases the DUT and produces an amplified version of the DUT’s input offset voltage (V a Proportional plus Integral (PI) controller loop, a high gain amplifier and a filter.

). It includes gain at the input,

OST

FIGURE 1-2: Simplified Circuit.

The elements of Figure 1-2 correspond to the components in the complete schematic (A.3 “Board – Schematic”) as follows.

TABLE 1-2: CONVERSION OF SCHEMATIC COMPONENTS

Complete Schematic

Components

R1, R2 R12=R1||R2 ≈ 196.1Ω R3 R3=R3 ≈ 200.0Ω R4 R R5, R6 R R7, R8 R78=R7+R8 ≈ 40.0 kΩ C2 C U1 “DUT” — — U2 “+1 Buffer” — — R11, R12 “1/G R13, R14 = R13 / (R13 + R14) ≈ 1 / (3.213 V/V) U3, R11, R12, C6 “Integrator (ω U3, R17, C7 ω U4, R23, R24, R25, R26, S2 “G

R28, C12 “Lowpass Filter (ω Note 1: Switch S2’s top position is closed when to the right (LOW GAIN), and is open when to the left (HI GAIN).

Simplified Schematic

Component

Conversion

Equations

=R4 ≈ 10.00 kΩ

=R5+R6 ≈ 8.04 kΩ

=C2 ≈ 22 nF

” = R11 / (R11 + R12) ≈ 1 / (3.213 V/V)

INT

/s)” ω

INT

)” ωBW= 1 / (R28 · C12) ≈ 2π (1.59 Hz)

= 1 / ((R11 || R12)C6) ≈ 2π (10.3 Hz)

INT

= 1 / (R17 · C7) ≈ 2π (10.4 Hz)

INT

” =1+R24/R23 ≈ 3.941 V/V, S2 closed

= 1 + (R24 + R25 + R26) / R23 ≈ 39.18V/V, S2open

Typical Values

(Note 1)

MCP651 Input Offset Evaluation Board User’s Guide

OUTXVCOX

≈

VMGAGMV

OST

≈

Where:

GA=1+R4/R3≈ 51.00 V/V

AGM

≈ 201.0 V/V, S2 (position 1) closed ≈ 1998 V/V, S2 (position 1) open

Analysis of this simplified circuit gives the following nominal circuit outputs:

EQUATION 1-2:

and R2 (R12) balance the circuit at the DUT’s input. These resistors are small, and

are oriented on the Printed Circuit Board (PCB) to cancel their thermoelectric voltages. The parallel resistances R DUT’s input bias currents to the measured V affect V V

OST

); the typical value of IOS at +125°C is ±100 pA, which produces a change in

of ±0.02 µV.

The unity gain buffer (+1 gain on the bottom right) isolates the V the following attenuator and integrator. Although it’s not shown here, the resistor R14 at the input to the “+1 Buffer” ensures its output voltage is 0V when the V is left open.

The attenuators (1/G U2 and U3 (“+1 Buffer” and (“Integrator”). For instance, when V V

=0.3V and V

SSI

DDI

1.80V. The differential integrator accumulates the scaled difference between V

, which slowly forces this difference to zero (the I part of the PI controller).

OUTX

Resistor R R

; it minimizes the error at V

injects the integrator’s output at the DUT’s input through resistors R4 and

A proportional term (the P part of the PI controller) is also injected at the DUT’s input through resistor R

negligible above 16 Hz). It also sets a low frequency DUT noise gain of about 505 V/V. This proportional term is rolled off by C interact with the integrator term, and low enough to keep the DUT stable. Thus, C minimizes noise gain at higher frequencies, which reduces the chance of unwanted feedback effects.

With the overall gain G V

values up to either ±12.4 mV or ±1.25 mV. A voltmeter with 1 mV resolution can

OST

distinguish steps of either 5 µV or 0.5 µV, respectively. The DUT’s noise seen at the input to G

and C2 (0.28 kHz). This implies that this noise is dominated by the 1/f noise. The

Lowpass Filter (f

≈ 1.6 Hz) reduces this 1/f noise a little more before it is seen at VM.

The measured noise, over a 140 second period of time with a typical part, was about 19 µV V

referred to input (RTI). This compares favorably with the MCP651’s calibrated

P-P

specification (±200 µV, maximum at +25°C).

||R2 and R3||R4 are equal to minimize the contribution of the

) scale V

INT

and V

COX

(contributions by R5 through R8 do not

OST

input filters from

COX

so that they do not overdrive op amps

OUTX

= 5.6V (given

OUTX

connector

= 5.8V), the voltages at the outputs of the attenuators (1/G

and

COX

OUTX

; it stabilizes the control loop (the integrator term becomes

starting at 0.18 kHz; this is high enough to not

of either 201 V/V or 1998 V/V, this circuit can measure

AGM

has a noise power bandwidth (NPBW) set by

INT

) is

Product Overview

2.2 kΩ

10 kΩ

150Ω

4.49Ω

DDX

100 nF

DUT

CAL

OUT

OUTX

10 µF

DDI

4.49Ω

SSX V

SSI

1.00 kΩ V

4.49Ω

10 µF

100 nF

CALX

DDXVDDI

–

---------------------------------=

SSXVSSI

–

----------------------------=

1.4.3 DUT Bias Voltage Inputs

Figure 1-3 shows the basic DUT biasing circuitry, except the input pins which have already been discussed (V

CMX

=0V).

FIGURE 1-3: DUT Bias Circuitry.

Lab power supplies are connected to V R

, along with the capacitors C13, C14, C21 and C22, minimize crosstalk from the other

op amps on the board. Since the MCP651’s quiescent current is between 3 mA and 9 mA, the actual power supply voltages (V 90 mV. I

EQUATION 1-3:

The DUT’s V when it is in calibration mode. Thus, the DUT’s offset (V this board) is equal to V

The RCAL potentiometer (POT or R43), with the resistors R

The values chosen allow the POT to cover the specified V Connecting a voltmeter to V that it is also possible to drive V be, but doesn’t have to be, at mid-range).

is set, as previously explained, to be equal to V

OUTX

control loop. If V railed at the corresponding supply voltage.

The load resistor (R usually set to mid-supply. The V loading on V

and V

DDX

DDI

SSX

and V

and ISS can be calculated as (ISS is negative):

pin sets its internal common mode voltage (V

CAL

CALX

makes it possible to set the POT accurately. Notice

CALX

with an external voltage source (the wiper should

CALX

or V

SSI

connection can be left open, which minimizes the

, then the loop forces V

DDI

is at or beyond V

COX

OUTX

or R10) is biased to the externally supplied voltage VLX. VLX is

(about 40 kΩ).

. The resistors R29, R30, R37 and

) are different by 30 mV to

SSI

of the MCP651)

CMX

) is small when V

and R43, sets V

range, and a little more.

CALX

by the integrator in the PI

COX

CMX

OUTX

(0V on

CALX

to be

MCP651 Input Offset Evaluation Board User’s Guide

10 kΩ

4.49Ω

4.99Ω

DDX

1.0 µF

DUT

CAL/CS

4.49Ω

4.99Ω

SSX

10Ω

10 kΩ

100 kΩ

1.4.4 CAL Input

The DUT’s CAL/CS input pin is normally held at V keeps the MCP651 in its normal mode of operation. When S pulls CAL/CS its low power mode of operation. Releasing S a time set by R enough to de-glitch S

up to V

, R21 and C9); the time constant (R20+R21)C9 is 0.11s, which is slow

(after a time set by R20 and C9), so that the MCP651 enters

DDX

. Note that the supply voltages need to be constant while the

then brings CAL/CS back to V

by resistors R20 and R21; this

SSX

is closed by the user, R20

SSX

(after

DUT is being put into calibration mode, and during calibration mode (up to 4 ms of time after CAL/CS

goes low).

FIGURE 1-4: CAL Switch and De-glitching Circuitry.

1.4.5 Bias Inputs for Other Op Amps

The other op amps (U2, U3 and U4) are run on dual power supplies centered on ground. The design assumes that these supplies are ±2.5V, for the best performance. These supplies can be set as low as ±0.9V, which will keep the MCP6V01’s working, but will reduce the range of possible V

and VM values.

COX

1.4.6 Outputs

The connector V used to measure the actual DUT supply voltages, and to estimate its supply currents I

and ISS. V

OUTX

is operating correctly. V 201 V/V or 1998 V/V.

outputs the voltage set by the POT RCAL. V

CALX

DDI

and V

SSI

are

is the DUT’s output voltage; it is used only to verify that the circuit

is the most important output; it is V

multiplied by either

OST

Chapter 2. Installation and Operation

2.1 INTRODUCTION

This chapter shows how to set up and operate the MCP651 Input Offset Evaluation Board. Items discussed in this chapter include:

• Required Tools

• Configuring the Lab Equipment and PCB

• Operating Conditions

• Calculating DUT Parameters

• Settling Time, Noise, and Sampling Rate

2.2 REQUIRED TOOLS

• (1 or 2) Lab Power Supplies with (two) tracking outputs

- One for +2.5V, GND -2.5V

- The other for V V

= 2.5V and V

DDX

• (0 to 3) independent Lab Power Supplies

- Drive V in the next section)

- Adjustable up to ±7.0V

• (1 or 2) Voltmeters

- Measure V

- 1 mV resolution

- -6V to +6V minimum range

- Differential measurement (e.g., hand held meter)

, VLX and V

CALX

, V

MCP651 INPUT OFFSET

EVALUATION BOARD

, GND, V

DDX

OUTX

=-2.5V)

SSX

COX

(the latter is for troubleshooting only)

(adjustable up to ±7.0V; optional if

SSX

(any or all of these can be not used, as described

USER’S GUIDE

MCP651 Input Offset Evaluation Board User’s Guide

5 6

1213

2.3 CONFIGURING THE LAB EQUIPMENT AND PCB

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

FIGURE 2-1: Lab Equipment Connections and Configuration Switches for the MCP651 Input Offset Evaluation Board.

The arrows and numbers in Figure 2-1 signify the following:

1. Gain Setting Switch – top position (# 1) a) To the right (ON) for low gain (G

2. Voltmeter to measure VM a) Gives amplified offset (G

b) To the left for high gain (G

3. Power Supply for VCOX a) Can be left open (forces VOUTX = 0V).

AGMVOST

= 201 V/V).

=1998V/V).

b) Set between VSSI and VDDI.

4. ±2.5V Power Supplies with GND a) Set at +2.5V and -2.5V (for best performance).

5. Power Supply for VLX (Load Resistor’s bias point) a) Can be left open (fewer lab power supplies; R b) Can be shorted to GND with a jumper wire (VLX = 0V and R c) Can connect to an external lab power supply (R

=40kΩ).

=1kΩ).

Installation and Operation

6. Voltmeter to measure VOUTX

a) Typically not used (mainly used for validating DUT and board).

7. POT (RCAL) Thumb-wheel (to adjust VCALX)

a) Rotate clockwise (CW) to increase VCALX. b) Rotate counter-clockwise (CCW) to decrease VCALX. c) Usually set at mid-turn. d) Can override with an external power supply at VCALX or a jumper wire (see

# 9 below)

8. Power Supply for VSSX

a) Minimum of about VDDX – (DUT’s maximum operating supply

voltage) – (0.12V for the resistors in the supply line). b) Maximum of +0.3V (for V c) When VSSX = -2.5V and VDDX = +2.5V, you can connect to the -2.5V

supply with a jumper wire (fewer lab power supplies).

9. Power Supply for VCALX a) Usually not connected (RCAL sets V b) Can be shorted to GND with a jumper wire (fewer lab power supplies;

CALX=VCMX

=0V).

c) Can connect to an external lab power supply (it is best, but not necessary, to

set RCAL to mid-supply).

10. Power Supply for VDDX a) Minimum of -0.3V (for V b) Maximum of about VSSX + (DUT’s maximum operating supply

voltage) + (0.12V for the resistors in the supply line).

c) When VSSX = -2.5V and VDDX = +2.5V, you can connect to the +2.5V

supply with a jumper wire (fewer lab power supplies).

11. CAL Switch a) Press to initiate calibration sequence (corrects DUT’s V

common mode voltage set to VCALX).

b) There is a delay of about 4 ms for the calibration to complete, plus several

tenths of a second for the circuit to settle.

12. Voltmeter at VDDI and VDDX (to measure I a) Measure ΔV=V b) Calculate I

DDX–VDDI

= ΔV/(10Ω)

13. Voltmeter at VSSI and VSSX (to measure I a) Measure ΔV=V b) Calculate I

SSX–VSSI

= ΔV/(10Ω); (this is a negative value)

at 0.3V below negative rail).

CMX

; fewer lab power supplies).

CALX

at 0.3V above positive rail).

CMX

)

, with internal

OST

Note: For the best accuracy and ease of use, short VCALX to GND, set the other

voltages for the desired bias during calibration, then initiate a calibration event in the DUT (push S1). Change the bias point afterwards to see how V

is changed.

OST

MCP651 Input Offset Evaluation Board User’s Guide

2.4 OPERATING CONDITIONS

The MCP651 Input Offset Evaluation Board works most effectively at room temperature (near 25°C). Measurements at other temperatures should be done in an oven where the air velocity is minimal. Table 2-1 shows the various DUT voltages (as described in the data sheet), their nominal values and ranges, and how to convert to the voltages needed on the MCP651 Input Offset Evaluation Board.

TABLE 2-1: CONVERTING VOLTAGES FOR THE BOARD

Single Supply Voltages (V)

Data Sheet

Symbol

Nominal Range

2.5 or 5.5 2.5 to 5.5 V 00 V VDD/3 VSS– 0.3 to VDD–1.3

0 ← VCM–V

(Note 1)

(Note 2) VDD/2 VSS+ 0.2 to VDD–0.2 V

OUT

CAL

CAL/CS V

VDD/2 VSS to V

VDD/3 (Note 3) VSS+ 0.1 to VDD–1.4 V

VSS to V

(Note 4)

Note 1: At TA= +25°C. See the data sheet for changes in VCM range vs. TA.

2: Set the desired V

voltage at the V

OUT

input; the integrator then forces V

COX

be the same voltage.

3: When the V

connected, so V

4: The circuit forces CAL/CS

pin left open. However, this board always has the POT (R43)

CAL

is never truly open.

CALX

to stay within its range (as long as the supply voltages

are constant when the CAL switch is activated). Normally, the part is on.

5: These numbers are for the MCP651 op amp.

Once the MCP651 Input Offset Evaluation Board is powered up, the switches can be set for the desired operation. S1 (a normally off push-button switch) starts a calibration event (CAL), internal to the DUT, when pushed. S2 (top position) sets the gain of the amplifier (G

) either high or low. See Table 2-2 for details.

Conversion

Equations (V)

← VDD–V

DDX

← VSS–V

SSX

← V

OUTX

← VL–V

← V

CALX

OUT–VCM

CAL–VCM

OUT

TABLE 2-2: SWITCH OPERATION

Switch Input Result

S1 No Input Normal Operation

Pushed Calibration event started in DUT

S2 Top Switch to the left High Gain (1998 V/V)

Top Switch to the right Low Gain (201 V/V) (Bottom Switch) (Don’t Care)

The gain is usually set low. It can be set high just after a calibration event, before changing the DUT’s bias point, to obtain more accurate results for the calibrated offset voltage.

The POT (R

or R43) adjusts V

CAL

. This voltage is where the DUT’s common mode

CALX

input voltage set during a calibration event (initiated by pushing S1). Adjusting this POT does not have an effect on the circuit’s behavior until the CAL switch (S1) is pushed.

Installation and Operation

OST

VMGAG

()

⁄

Given:

Then:

OST

=0.5mV, VCM=0V

OST

=1.0mV, VCM=5V

ΔV

OST

=0.5mV

ΔVCM=5.0V

CMRR = 5.0V / 0.5 mV

=10V/mV =80dB

2.5 CONVERTING TO OTHER PARAMETERS

2.5.1 Calculating DUT Parameters

The DUT’s total input offset voltage (V

) can be calculated from a measurement as

OST

shown in Equation 2-1.

EQUATION 2-1:

Changing the DUT’s bias voltages or ambient temperature changes V application note AN1177 discusses in detail how these changes in V

. Microchip’s

OST

are related to

OST

specifications found in our data sheets. The following list summarizes the results:

• Specified Input Offset Voltage:

-V

= Input offset at the specified bias point

• DC Common Mode Rejection Ratio:

- CMRR = ΔV

/ΔV

• DC Power Supply Rejection Ratio:

- PSRR = (ΔV

– ΔVSS)/ΔV

• DC Open-loop Gain:

-A

= ΔV

OUT

/ΔV

• Input Offset Drift over Temperature:

- ΔV

/ΔT

Note: The data sheet Input Offset Voltage (VOS) specification applies to one bias

point and temperature only. The total input offset voltage (V V

and changes in input offset as bias voltages and temperature change.

) includes

OST

Example 2-1 gives an example of how V voltage (V

changes with the common mode input

OST

EXAMPLE 2-1: COMMON MODE CHANGE EXAMPLE

MCP651 Input Offset Evaluation Board User’s Guide

2.5.2 Application

Table 2-3 shows one possible measurement matrix that will allow the user to estimate key parameters for the DUT. Obviously, other values of V selected.

TABLE 2-3: MEASUREMENT MATRIX

Operating Inputs Measurement (Note 1)

(V)

(°C)

+25 5.5 2.75 1.83 40 V

0.20 1.83 V

5.30 V

2.5 1.25 0.83 V

0.20 0.83 V

2.30 V

-40 5.5 2.75 1.83 V

+85 V

+125 V

OUT

(V)

-0.30 4 V

4.20 V

-0.30 V

1.20 V

(V/V)

Symbol Comments

VOS and PSRR

CMRR

M10

M11

M12

M13

VOS and PSRR CMRR CMRR A

VOS at temperature and ΔVOS/ΔT

Note 1: Before making these measurements, set up the DUT to the bias point described for

. Short V

, then alter the operating conditions for each succeeding measurement; do not

to GND. Then start a calibration (CAL) event using S1. Measure

CALX

initiate another calibration event until all measurements are done.

Based on these measurements, we can make the following estimates, where the V

values are calculated from the measured VMk values (see Equation 2-1):

OST_k

and V

could be

CAL

TABLE 2-4: ESTIMATES

Operating Inputs Estimates

(V)

1.8 and 5.5 +25 1/PSRR = (V

5.5 -40 V

1.8 +25 V

Obviously, other values of T

(°C)

OST_1–VOST_6

+25 VOS=V +85 V

+125 V

-40 to +125 ΔVOS/ΔTA=(V +25 1/CMRR = (V

1/AOL=(V

1/CMRR = (V

1/A

, VDD, … can be used instead, with the proper adjustments

OST_11

OST_1

OST_12

OST_13

OST_13–VOST_11

OST_3–VOST_2

OST_5–VOST_4

OST_6

OST_8–VOST_7

=(V

OST_10–VOST_9

Equations Units

to these equations.

)/(3.0V) µV/V

µV µV µV µV

) / (165°C) µV/°C )/(4.5V) µV/V )/(5.1V) µV/V

µV

)/(1.5V) µV/V

) / (2.1V) µV/V

Installation and Operation

2.6 SETTLING TIME, NOISE AND SAMPLING RATE

The bandwidth seen by the signal (DUT’s V

and noise voltage), between the DUT’s

OST

input and VM, is set mainly by the lowpass filter at the VM test point (TP5); this bandwidth is about 1.6 Hz. This bandwidth sets the settling time seen at VM (after the DUT’s bias point has been changed) to about 0.6 seconds.

The noise seen in the measurements is a result of DUT’s input noise voltage passed through the same 1.6 Hz lowpass filter. The MCP651’s 1/f noise dominates at such low frequencies, so V

will appear to wander over time. The standard deviation of this

OST

1/f wander can be estimated to be roughly:

•5µV

•34µV

for a time period of 1 second

P-P

for a time period of 10 years

P-P

Averaging several measurements together will help reduce the noise over a short period of time. It must be understood, however, that the 1/f noise will make V

OST

appear to change over long periods of time. There is a practical limit on increasing the sample rate; the noise does not improve

significantly after a certain point. The analog lowpass pole at 1.6 Hz causes closely spaced samples to be correlated. To avoid the overhead caused by sampling too fast, keep the sampling period near or above the pole’s time constant (0.10s); this gives a minimum sample rate of 10 samples per second.

Note: Sampling much faster than 10 SPS will not improve the averaged noise

significantly.

MCP651 Input Offset Evaluation Board User’s Guide

NOTES:

MCP651 INPUT OFFSET

12.4 mV, Low Gain±

1.25 mV, High Gain±

Where:

Low Gain = 201 V/V High Gain = 1998 V/V

EVALUATION BOARD

USER’S GUIDE

Chapter 3. Possible Modifications

3.1 INTRODUCTION

This chapter shows how to modify the MCP651 Input Offset Evaluation Board to measure other single op amps from Microchip Technology Inc. Items discussed in this chapter include:

• Range of Parts Supported by the MCP651 Input Offset Evaluation Board

• Changes to Accommodate Other DUTs

3.2 RANGE OF PARTS SUPPORTED BY MCP651 INPUT OFFSET EVALUATION BOARD

Only op amps that fall within a certain performance range are supported by the MCP651 Input Offset Evaluation Board.

3.2.1 Input Offset Voltage

In order to keep op amps U3 and U4 operating normally, the DUT’s VOS must be:

EQUATION 3-1:

More accurate op amps need higher gain for good resolution. Table 3-1 shows what V

specs can be supported for different voltmeter resolutions and amplifier gains.

TABLE 3-1: LOWER LIMIT ON V

Voltmeter Resolution

(mV)

1 mV 201 (low gain) 500

0.1 mV 201 (low gain) 50

Note 1: These results assume a minimum measurement resolution of 1% of the V

2: The DUT needs to be soldered to the PCB when the maximum V

±50 µV, or so. Inserting a PDIP-8 part into a 8-pin socket creates a contact potential (error) of the order of ±1 µV. Also, 1/f noise needs to be low.

RANGE (NOTE 1)

GAG

(V/V)

1998 (high gain) 50

1998 (high gain) 5 (Note 2)

max(VOS) ≥

(±µV)

is less than

OST

range.

MCP651 Input Offset Evaluation Board User’s Guide

OHVCM

– 7.5V

≤

VCMVOL– 7.5V

≤

500 kHz GBWP 100 MHz

≤≤

3.2.2 Output Headroom

The DUT’s output headroom needs to be close enough to 0V to not overdrive U2 or U3. The maximum DUT V

EQUATION 3-2:

Rail-to-rail output op amps, on a single supply voltage, must be less than 7.5V.

3.2.3 Gain Bandwidth Product

There is a minimum Gain Bandwidth Product (GBWP) to keep the feedback loop stable, and a maximum GBWP to avoid crosstalk and other issues.

EQUATION 3-3:

and VOL values supported (relative to VCM) are:

Possible Modifications

MCP651

SOIC

VIN+

–

OUT

1 2 3 4

8 7 6 5

CAL

CAL/CSNC

DUT in PDIP-8DUT in SOIC-8

3.3 CHANGES TO ACCOMMODATE OTHER DUTS

This section focuses on methods to connect to other DUTs; the circuit’s design is not changed. Parts information can be found in Appendix B. “Bill Of Materials (BOM)”.

3.3.1 Pinout

Figure 3-1 shows the MCP651 op amp’s pinout. This is the standard 8-lead pinout, except for pins 5 and 8 (V Board is designed to take advantage of these input pins, but they are not necessary to this board’s operation.

FIGURE 3-1: MCP651 Pinout.

Op Amps with No Connection (NC) at pins 1, 5 and 8 will operate properly on the MCP651 Input Offset Evaluation Board. Other op amps may need to use an adaptor board; see Section 3.3.5 “Other Single Op Amps”.

and CAL/CS). The MCP651 Input Offset Evaluation

CAL

3.3.2 Removing the DUT

Since these boards come with the DUT (in SOIC-8) soldered on, it is necessary to de-solder them. Figure 3-2 shows the location of the DUT for either a SOIC-8 or a PDIP-8 package. A good de-soldering station makes this work much easier to do.

FIGURE 3-2: DUT’s Location on the PCB.

MCP651 Input Offset Evaluation Board User’s Guide

3.3.3 Single Op Amps in SOIC-8 Package

Solder onto the SOIC-8 pad shown in Figure 3-2. Pin 1 is on the top left (next to the U1 label). To avoid soldering and de-soldering many times, for slower parts, it may be better to use the option discussed in Section 3.3.5 “Other Single Op Amps”.

3.3.4 Single Op Amps in PDIP-8 Package

Remove the original SOIC-8 packaged part. Solder a DIP-8 IC Socket in the PDIP-8 location shown on Figure 3-2; this makes it easy to change PDIP-8 parts. It also is helpful for parts for other package and pinout options; see Section 3.3.5 “Other Single Op Amps”. Figure 3-3 shows this board after the DIP-8 IC socket has been installed.

FIGURE 3-3: PCB with SOIC-8 Part Removed and DIP-8 IC Socket Installed.

The socket may not work well in two cases (solder directly to the PCB instead):

• Very fast op amps (i.e., GBWP > 100 MHz)

• Very accurate op amps (i.e., V

<±50µV)

OST

3.3.5 Other Single Op Amps

With a DIP-8 IC Socket on the evaluation board (see Section 3.3.4 “Single Op Amps in PDIP-8 Package”), it is relatively easy to adapt the MCP651 Input Offset Evaluation

Board to many other op amps. An adaptor board is stacked on top using headers that solder to the adaptor board, using PDIP-8 through holes, and are inserted into the DIP-8 socket on the evaluation board. The adaptor board can accommodate:

• Different packages

• Different pinout options (can be dealt with on the adaptor board)

• Parts with multiple op amps The adaptor boards approach may not work well in two cases:

• Fast op amps (i.e., GBWP > 10 MHz); adding bypass capacitors to the adaptor board may help

• Accurate op amps (i.e., V

<±50µV)

OST

Possible Modifications

Front View

Back View

Figure 3-4 shows a SOIC-8 op amp soldered onto the 8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board available from Microchip Technology Inc. The two interconnect strips on the bottom are soldered into the through holes for the DIP-8 socket. Figure 3-5 shows this board plugged into the MCP651 Input Offset Evaluation Board.

Note 1: Build the adaptor board in the following sequence. Insert the interconnect

headers into the DIP-8 socket on the MCP651 Input Offset Evaluation Board. Place the SOIC8EV board on the top of the interconnect headers, while maintaining the correct pin orientation. Solder the headers to the top board. Clip the pins flush with the top surface of the SOIC8EV board, then solder the (SOIC-8) op amp on the top.

2: See Table B-4 for part numbers of this board and its components.

FIGURE 3-4: Op Amp in SOIC-8 Package and Connector Headers Soldered to Adaptor PCB.

FIGURE 3-5: Adaptor Board Connected to the MCP651 Input Offset Evaluation Board.

MCP651 Input Offset Evaluation Board User’s Guide

NOTES:

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

This appendix contains the schematics and layouts for the MCP651 Input Offset Evaluation Board.

A.2 SCHEMATIC AND LAYOUTS

See A.3 “Board – Schematic” for the circuit diagram. U1 is the DUT (MCP651). U2 buffers the attenuated and filtered control voltage VCOX. U3 is the differential integrator. U4 is the amplifier that gives the final gain to the DUT’s input offset voltage (V

). Switch S1 gives the user a means of starting an auto-calibration cycle in the

OST

DUT. Switch S2 makes it so the amplifier (U4) can have two different gains, providing a tradeoff between accuracy and range.

A.4 “Board – Combination of the Top Silk-Screen, Top Solder Mask and Top Metal Layers” through A.7 “Board – Bottom Metal Layer” show the PCB layout plots. This

PCB has two metal layers: signal and power traces on top and ground plane on bottom. Groups of critical resistors have been arranged so that their thermoelectric voltages cancel (assuming constant temperature gradient); these groups are:

•R

through R

•R5 and R

•R7 and R

•R21 through R

•R24 and R The Gerber files for this board are available on the Microchip website

(www.microchip.com) and are contained in the zip file “00258R2_Gerbers.zip”.

4 6 8

MCP651 INPUT OFFSET

EVALUATION BOARD

USER’S GUIDE

MCP651 Input Offset Evaluation Board User’s Guide

A.3 BOARD – SCHEMATIC

Schematics and Layouts

A.4 BOARD – COMBINATION OF THE TOP SILK-SCREEN, TOP SOLDER MASK

AND TOP METAL LAYERS

MCP651 Input Offset Evaluation Board User’s Guide

A.5 BOARD – TOP SILK-SCREEN

Schematics and Layouts

A.6 BOARD – TOP SOLDER MASK AND TOP METAL LAYER

MCP651 Input Offset Evaluation Board User’s Guide

A.7 BOARD – BOTTOM METAL LAYER

MCP651 INPUT OFFSET

EVALUATION BOARD

USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

B.1 MCP651 INPUT OFFSET EVALUATION 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-3 shows components that are not populated.

TABLE B-1: BILL OF MATERIALS FOR ASSEMBLED PCB

Qty

1 C8 1.0 nF, 0603 SMD, X7R, 16V, 10% Panasonic 1 C2 22 nF, 0603 SMD, X7R, 16V, 10% Panasonic-ECG ECJ-1VB1C223K 1 C10 33 nF, 0603 SMD, X7R, 16V, 10% Panasonic-ECG ECJ-1VB1C333K 11 C3, C11,

2 C6, C7 150 nF, 1206 SMD, X7R, 50V, 10% Panasonic-ECG ECJ-3VB1C154K 4 C4, C5, C9, C12 1.0 µF, 1206 SMD, X7R, 16V, 10% Panasonic-ECG ECJ-3YB1C105K 4 C21 – C24 10 µF, 1206 SMD, X7R, 16V, 10% Panasonic-ECG ECJ-3YX1C106K 1 PCB MCP651 Input Offset Evaluation Board,

2 R2, R3 200Ω, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-201-B-T5 1 R23 5.10 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-512-B-T5 1 R4 10.0 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-103-B-T5 1 R24 15.0 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-153-B-T5 1 R26 86.6 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-8662-B-T5 1 R25 93.1 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-9312-B-T5 2 R12, R14 150 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-154-B-T5 2 R11, R13 332 kΩ, 0603 SMD, 0.1%, 25 ppm/°C, 1/10W Susumu Co. Ltd. RG1608P-3323-B-T5 2 R37, R38 4.99Ω, 0603 SMD, 1%, 1/10W Yageo RC0603FR-074R99L 1 R10 1.00 kΩ, 0603 SMD, 1%, 1/10W Panasonic-ECG ERJ-3EKF1001V 2 R5, R6 4.02 kΩ, 0603 SMD, 1%, 1/10W Panasonic-ECG ERJ-3EKF4021V 1 R22 4.99 kΩ, 0603 SMD, 1%, 1/10W Panasonic-ECG ERJ-3EKF4991V 2 R7, R8 20.0 kΩ, 0603 SMD, 1%, 1/10W Panasonic-ECG ERJ-3EKF2002V 1 R17 102 kΩ, 0603 SMD, 1%, 1/10W Panasonic-ECG ERJ-3EKF1023V 4 R31, R35, R36,

1 R27 100Ω, 0603 SMD, 5%, 1/10W Panasonic-ECG ERJ-3GEYJ101V 2 R16, R18 3.3 kΩ, 0603 SMD, 5%, 1/10W Panasonic-ECG ERJ-3GEYJ332V 4 R1, R9, R19, R21 10 kΩ, 0603 SMD, 5%, 1/10W Panasonic-ECG ERJ-3GEYJ103V 3 R15, R20, R28 100 kΩ, 0603 SMD, 5%, 1/10W Panasonic-ECG ERJ-3GEYJ104V 2 R29, R30 4.99Ω, 1206 SMD, 1%, 1/4W Yageo RC1206FR-074R99L

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

Reference

Designator

100 nF, 0603 SMD, X7R, 16V, 10% Panasonic-ECG ECJ-1VB1C104K

C13–C20, C25

2-layer PCB (3.00 in × 2.50 in)

10Ω, 0603 SMD, 5%, 1/10W Panasonic-ECG ERJ-3GEYJ100V

R40

used in manufacturing uses all RoHS-compliant components.

Description Manufacturer Part Number

-ECG ECJ-1VB1H102K

Microchip Technology Inc.

102-00258

Bill Of Materials (BOM)

Qty

5 R32 – R34, R39,

1 R42 150Ω, 1206 SMD, 5%, 1/4W Panasonic-ECG ERJ-8GEYJ151V 1 R44 2.2 kΩ, 1206 SMD, 5%, 1/4W Panasonic-ECG ERJ-8GEYJ222V 1 R43 10 kΩ POT, SMD, 20%, 1 Turn Thumbwheel Bournes Inc. 3352T-1-103LF 1 S1 SPST-NO, SMD, Switch, Push Button, 1 Pos. Panasonic-ECG EVQ-P2R02M 1 S2 SMD, Switch, DIP, 2 Pos. Grayhill Inc. 90HBW02PT 15 TP1 – TP15 SMD, Test Point Keystone

1 U1 SOIC-8, Single Op Amp Microchip 3 U2 – U4 MCP6V01, SOIC-8, Single Op Amp MCP6V01-E/SN 4 (for PCB mounting) Hemispherical Bumpon Standoff,

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

Reference

Designator

10Ω, 1206 SMD, 5%, 1/4W Panasonic-ECG ERJ-8GEYJ100V

R41

0.44 in × 0.20 in

used in manufacturing uses all RoHS-compliant components.

Description Manufacturer Part Number

Electronics

Technology Inc.

3M SJ-5003 (BLACK)

5016

MCP651-E/SN

TABLE B-2: BILL OF MATERIALS FOR ALTERNATE COMPONENTS

Qty

0 U1 PDIP-8, Single Op Amp Microchip

0 U1 DIP-8 IC Socket Tyco

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 MCP6XXX represents any Microchip single op amp, with standard pinout, that fits the given design.

Reference

Designator

0.285" max. O.D.

1/4" long, Nylon

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

MCP6XXX (Note 1)

Technology Inc.

2-641260-1

Electronics Keystone

Electronics Building

Fasteners

1902C

NY PMS 440 0025 PH

TABLE B-3: BILL OF MATERIALS FOR NOT POPULATED COMPONENTS

Qty

0 C1 Unknown Value, 0603 SMD, X7R, 16V, 10% Panasonic Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM

Reference

Designator

used in manufacturing uses all RoHS-compliant components.

Description Manufacturer Part Number

-ECG —

Bill Of Materials (BOM)

B.2 ADAPTOR BOARD BOM

The BOM in Table B-4 shows the components needed to build the adaptor board for alternate DUT’s (see Figure 3-4).

TABLE B-4: BILL OF MATERIALS FOR ADAPTOR BOARD

Reference

Qty

Designator

1 — 8-Pin SOIC/MSOP/TSSOP/DIP Evaluation Board Microchip Technology

2 — Board-to-Board Connector, Low Profile Header,

4 Positions, 0.100 in, Gold Plated 2 — 100 nF, 0603 SMD, X7R, 16V, 10% Panasonic 1 — Single Op Amp in Standard 8-pin pinout Microchip Technology

Note 1: 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

SOIC8EV

Inc. Samtec Inc. BBL-104-G-F

-ECG ECJ-1VB1C104K MCP6XXX

Inc.

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://support.microchip.com Web Address: www.microchip.com

Atlanta

Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455

Boston

Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088

Chicago

Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075

Cleveland

Independence, OH Tel: 216-447-0464 Fax: 216-447-0643

Dallas

Addison, TX Tel: 972-818-7423 Fax: 972-818-2924

Detroit

Farmington Hills, MI Tel: 248-538-2250 Fax: 248-538-2260

Kokomo

Kokomo, IN Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608

Santa Clara

Santa Clara, CA Tel: 408-961-6444 Fax: 408-961-6445

Toronto

Mississauga, Ontario, Canada Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Asia Pacific Office

Suites 3707-14, 37th Floor Tower 6, The Gateway Harbour City, Kowloon Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431

Australia - Sydney

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Tel: 86-10-8528-2100 Fax: 86-10-8528-2104

China - Chengdu

Tel: 86-28-8665-5511 Fax: 86-28-8665-7889

China - Hong Kong SAR

Tel: 852-2401-1200 Fax: 852-2401-3431

China - Nanjing

Tel: 86-25-8473-2460 Fax: 86-25-8473-2470

China - Qingdao

Tel: 86-532-8502-7355 Fax: 86-532-8502-7205

China - Shanghai

Tel: 86-21-5407-5533 Fax: 86-21-5407-5066

China - Shenyang

Tel: 86-24-2334-2829 Fax: 86-24-2334-2393

China - Shenzhen

Tel: 86-755-8203-2660 Fax: 86-755-8203-1760

China - Wuhan

Tel: 86-27-5980-5300 Fax: 86-27-5980-5118

China - Xiamen

Tel: 86-592-2388138 Fax: 86-592-2388130

China - Xian

Tel: 86-29-8833-7252 Fax: 86-29-8833-7256

China - Zhuhai

Tel: 86-756-3210040 Fax: 86-756-3210049

ASIA/PACIFIC

India - Bangalore

Tel: 91-80-3090-4444 Fax: 91-80-3090-4080

India - New Delhi

Tel: 91-11-4160-8631 Fax: 91-11-4160-8632

India - Pune

Tel: 91-20-2566-1512 Fax: 91-20-2566-1513

Japan - Yokohama

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea - Daegu

Tel: 82-53-744-4301 Fax: 82-53-744-4302

Korea - Seoul

Tel: 82-2-554-7200 Fax: 82-2-558-5932 or 82-2-558-5934

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857 Fax: 60-3-6201-9859

Malaysia - Penang

Tel: 60-4-227-8870 Fax: 60-4-227-4068

Philippines - Manila

Tel: 63-2-634-9065 Fax: 63-2-634-9069

Singapore

Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan - Hsin Chu

Tel: 886-3-6578-300 Fax: 886-3-6578-370

Taiwan - Kaohsiung

Tel: 886-7-536-4818 Fax: 886-7-536-4803

Taiwan - Taipei

Tel: 886-2-2500-6610 Fax: 886-2-2508-0102

Thailand - Bangkok

Tel: 66-2-694-1351 Fax: 66-2-694-1350

EUROPE

Austria - Wels

Tel: 43-7242-2244-39 Fax: 43-7242-2244-393

Denmark - Copenhagen

Tel: 45-4450-2828 Fax: 45-4485-2829

France - Paris

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany - Munich

Tel: 49-89-627-144-0 Fax: 49-89-627-144-44

Italy - Milan

Tel: 39-0331-742611 Fax: 39-0331-466781

Netherlands - Drunen

Tel: 31-416-690399 Fax: 31-416-690340

Spain - Madrid

Tel: 34-91-708-08-90 Fax: 34-91-708-08-91

UK - Wokingham

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

03/26/09

Microchip Technology MCP651 Input Offset Evaluation Board User guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

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

2.4 OPERATING CONDITIONS

2.5 CONVERTING TO OTHER PARAMETERS

2.6 SETTLING TIME, NOISE AND SAMPLING RATE

Chapter 3. Possible Modifications

3.1 INTRODUCTION

3.2 RANGE OF PARTS SUPPORTED BY MCP651 INPUT OFFSET EVALUATION BOARD

3.3 CHANGES TO ACCOMMODATE OTHER DUTS

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

A.2 SCHEMATIC AND LAYOUTS

A.3 BOARD – SCHEMATIC

A.5 BOARD – TOP SILK-SCREEN

A.6 BOARD – TOP SOLDER MASK AND TOP METAL LAYER

A.7 BOARD – BOTTOM METAL LAYER

Appendix B. Bill Of Materials (BOM)

B.1 MCP651 INPUT OFFSET EVALUATION BOARD BOM

B.2 ADAPTOR BOARD BOM

WORLDWIDE SALES AND SERVICE