MCP6V01DM-VOS - MICROCHIP - Datasheet.Live

MCP6V01

Input Offset

Demo Board

User’s Guide

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MCP6V01 INPUT OFFSET

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...................................................................................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 .....................................................................................................9

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

2.3 Connecting the Lab Equipment ......................................................................9

2.4 Operating Conditions ....................................................................................10

2.5 Calculating the DUT’s Input Offset Voltage ..................................................10

2.6 Converting Input Offset Voltage to Other Parameters ..................................10

2.7 Reducing the Measurement Noise ...............................................................12

Chapter 3. Possible Modifications

3.1 Introduction ...................................................................................................13

3.2 Changing the DUT ........................................................................................13

3.3 Connecting a Chip Select Pin to Ground ......................................................14

Appendix A. Schematics and Layouts

A.1 Introduction ..................................................................................................15

A.2 Schematic ....................................................................................................15

A.3 Combination of the Top Silk Screen and Top Metal Layers .....................17

A.4 Top Silk Screen ........................................................................................17

A.5 Top Metal Layer ....................................................................................... 18

A.6 Bottom Metal Layer ..................................................................................18

Appendix B. Bill Of Materials (BOM)

B.1 MCP6V01 Input Offset Demo Board BOM ...................................................19

Worldwide Sales and Service ....................................................................................20

MCP6V01 Input Offset Demo Board User’s Guide

NOTES:

MCP6V01 INPUT OFFSET

DEMO BOARD USER’S GUIDE

Preface

INTRODUCTION

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

MCP6V01 Input Offset 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 de scr ib es ho w to us e th e MC P6V0 1 Input Offset Demo Boar d. The

manual layout is as follows:

•Chapter 1. “Product Overview” - Important information about the MCP6V01

Input Offset Demo Board.

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

MCP6V01 Input Offset Demo Board. It lists the required tools and shows how to

connect and set up the lab equipment. The basic theory on converting

measurements to offset voltage, open-loop gain, CMRR, PSRR and input offset

drift is given, along with a worked example. Hints are the n given on reducing

measurement noise.

•Chapter 3. “Possible Modifications” - Shows simple modifications to the

MCP6V01 Input Offset Demo Board.

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

layouts for the MCP6V01 Input Offset Demo Board.

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

sub-assemblies in the MCP6V01 Input Offset Demo Board.

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.

MCP6V01 Input Offset Demo Board User’s Guide

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

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

Initial caps A window the Output window

A dialog the Settings dialog

A menu selection select Enable Programmer

Quotes A field name in a window or

dialog “Save project before build”

Underlined, italic text with

right angle bracket A menu path File>Save

Bold characters A dialog button Click OK

A tab Click the Power tab

N‘Rnnnn A number in verilog format,

where N is the total number of

digits, R is the radix and n is a

digit.

4‘b0010, 2‘hF1

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

Courier New font:

Plain Courier New Sample source code #define START

Filenames autoexec.bat

File paths c:\mcc18\h

Keywords _asm, _endasm, static

Command-li n e op ti o ns -Opa+, -Opa-

Bit values 0, 1

Constants 0xFF, ‘A’

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

any valid filena me

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 MCP6V01 Input Offset Demo 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 det ailed information on one op amp family that is used on the MCP6V01 Input

Offset Demo Board.

MCP6021/1R/2/3/4 Data Sheet, “Rail-to-Rail Input/Output, 10 MHz Op Amps”,

DS21685

Gives det ailed information on another op amp family that is used on the MCP6V01

Input Offset Demo Board.

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

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

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

Open-Loop Gain and VOS Drift over Temperature.

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 – Da ta 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 reque s ts, online dis cus sio n 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 repr esentatives

CUSTOMER SUPPORT

Users of Microchip products can receive assistance through several channels:

• Distributor or Representative

• Local Sales Of fice

• Field Application Engineer (FAE)

• Technical Support

• Development Systems Information Line

Customers should conta ct their distributor, represent ative or field applica tion engine er

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

offices and locations is included in the back of th is do cum e nt .

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

MCP6V01 Input Offset Demo Board User’s Guide

DOCUMENT REVISION HISTORY

Revision A (March 2009)

• Initial Release of this Document.

MCP6V01 INPUT OFFSET

DEMO BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1 INTRODUCTION

The MCP6V01 Input Offset Demo Board is described by the following:

• Assembly # : 102-00227-R3

• Order # : MCP6V01DM-VOS

• Name: MCP6V01 Input Offset Demo Board

Items discussed in this chapter include:

• Kit Contents

• Intended Use

• Description

1.2 KIT CONTENTS

This MCP6V01 Input Offset Dem o Board Kit includes:

• Assembled Printed Circuit Board (PCB)

• Important Information “Read First”

• Analog and Interface Products Demonstration Boards CD-ROM (DS2191 2)

Includes:

- MCP6V01 Input Offset Demo Board User’s Guide, (DS51801)

FIGURE 1-1: MCP6V01 Input Offset Demo Board Contents.

MCP6V01 Input Offset Demo Board User’s Guide

1.3 INTENDED USE

The MCP6V01 Input Offset Demo Board is intended to provide a simple means to

measure the MCP6V01/2/3 op amp’ s input of fset volt age (VOS) und er a variety of bias

conditions. This VOS includes the specified input of fset volt age value found in the dat a

sheet plus changes due to power supply voltage (PSRR), common mode volta ge

(CMRR), output voltage (AOL) and temperature (ΔVOS/ΔTA).

1.4 DESCRIPTION

Figure 1-2 shows the block diagram fo r the MCP6 V01 In pu t Offset Demo Boar d.

FIGURE 1-2: Block Diagram.

This circuit does the following:

• Supports Microchip’s auto-zeroed, single op amps:

-SOIC-8 package

- Used as both Device Under Test (DUT) and in a difference amplifier

• Test points for connecting lab equipment

• Single supply configuration

• The bias inputs VDD, VCM and GND set the conditions for the DUT

•The V

DD/2 Reference uses a resistor ladder to divide VDD in half, then buf fers that

voltage with an op amp in unity gain

•The V

CM Reference:

- Has a resistor divider at the input that sets V CM =V

DD/2 when that input is left

open

- When VCM is driven by an external volt age sou rce, the resistor divid er has no

effect on VCM

-V

CM is buffered

• The High Gain Feedback Network and DUT together:

- Have a noise gain of GN≈10.0 kV/V

- Have a common mode gain of 1 V/V

- Produce an output voltage of GNVOS +V

Outputs

GND

VCM

VDD

GND

VDD/2

Inputs

DUT

Diff. Amp.

VDD/2

Reference

VCM

Reference

(buffered)

High Gain

Feedback

Network

VREF.

VCM

Product Overview

• The Difference Amplifier (D iff. Amp.):

- Rejects the DUT’s common mode output (VCM)

- Provides additional gain (GDA ≈10.0 V/V) to the term GNVOS at the DUT’s

output

- Shifts the outp ut so it is centered on the reference VREF =V

DD/2

- Produce an output voltage of GDAGNVOS +V

DD/2

The inputs:

• Allow the DUT to be biased at most valid bias points

• Allow VCM to set by the circuit at VDD/2, or set by the user

The outputs:

• Make it easy to measure the important bias voltages VDD/2 and VCM

• Make it easy to measure VM–V

DD/2 = GDAGNVOS

MCP6V01 Input Offset Demo Board User’s Guide

NOTES:

MCP6V01 INPUT OFFSET

DEMO BOARD USER’S GUIDE

Chapter 2. Installation and Operation

2.1 INTRODUCTION

This chapter shows how to set up the MCP6V01 Input Offset Demo Board. Items

discussed in this chapter include:

• Required Tools

• Connecting the Lab Equipment

• Operating Conditions

• Calculating the DUT’s Input Offset Voltage (VOS)

• Converting Input Offset Voltage to Other Parame ters

• Reducing the Measurement No ise

2.2 REQUIRED TOOLS

• Lab Power Supplies:

- Two outputs

- 0V to 5.5V minimum range

- Adjustable

• One Voltmeter:

- 1 mV resolution

- -6V to +6V minimum range

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

2.3 CONNECTING THE LAB EQUIPMENT

Lab equipment is con nected to this board as shown in Figur e 2-1. The (su rface mount)

test points allow lab equipment to be connected to these boards. The power supplies

are connected at the right. The voltmeter is connected at the four different po ints

shown.

FIGURE 2-1: Board Connec tio ns for the MCP 6 V01 Input Offset Demo Board.

Power Supply

VCM – GND

VDD – GND

Voltmeter

VDD/2 – GND

Voltmeter

VM –VDD/2 Voltmeter

VCM – GND

Voltmeter

VO1–GND

MCP6V01 Input Offset Demo Board User’s Guide

2.4 OPERATING CONDITIONS

This 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.

The power supply (VDD) should be between 1.8V and 5.5V.

The common mode voltage (VCM) needs to be between 0.3V and VDD – 0.3V for proper

operation of this demo board.

2.5 CALCULATING THE DUT’S INPUT OFFSET VOLTAGE

The DUT’s total input of fset vo lt age (V OST) can be calcu lated from a mea suremen t as

shown in Equ at i on 2-1.

EQUATION 2-1:

2.6 CONVERTING INPUT OFFSET VOLTAGE TO OTHER PARAMETERS

2.6.1 Theory

Changing the bias volta ges changes the input offset voltage. Microchip’s application

note AN1 177 discusses in detail how these changes in VOS are related to specifications

found in our dat a sheets. The following list summarize s the parameter s that contribute

to VOST:

• Specified Input Offset Volt age:

-V

OS = Input offset at the specified bias point

• DC Common Mode Rejection Ratio:

- CMRR = ΔVCM/ΔVOS

• DC Power Supply Rejection Ratio:

- PSRR = (ΔVDD –ΔVSS)/ΔVOS

• DC Open-Loop Gain:

-A

OL = ΔVOUT/ΔVOS

• Input Offset Drift over Temperature:

-ΔVOS/ΔTA

VOST VMVDD 2⁄–()1G

DAGN

()⁄()⋅=

Where:

1/(GDAGN)≈10.0 µV/V

Note: The data she et Input Offset Voltage ( VOS) specification applies to one bi as

point and temperature only. The total input offset voltage (VOST) includes

VOS and other changes in input offset as bias voltages and temperature

change.

Installation and Operation

Example 2-1 gives an example of how VOST changes with the common mode input

voltage (VCM).

EXAMPLE 2-1: COMMON MODE CHANGE EXAMPLE

2.6.2 Application

When the common mode voltage (VCM) is changed on this demo board, the output

voltage (VOUT) is forced to change by the same amount. There is no means provided

to independently change VCM and VOUT. Thus, it is not possible to separate the

Open-Loop Gain (AOL) effect from the CMRR effect using this board.

Since AOL is usually much better than CMRR for the MCP6V0X op amps, we can

attribute most of the change to CMRR and ignore AOL in most cases. Table 2-1 shows

one possible measurement matrix that will allow the user to estimate key parameters

for the DUT.

TABLE 2-1: MEASUREMENT MATRIX

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

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

Given:

Then:

VOST =0.5µV, V

CM =0V

VOST =1.0µV, V

CM =5V

ΔVOST =0.5µV

ΔVCM =5.0V

CMRR = 5.0V / 0.5 µV

=10V/µV

= 140 dB

Note: VOUT cannot be changed in dependently of VCM, so AOL and CMRR cannot

be distinguished using th is circuit.

Operating Inputs

(Note 1) Measurement

(°C) VDD

(V) VCM

(V) Symbol Comments

+25 5.5 OFF VM1 Quick Check

VDD/3 VM2 VOS and PSRR

0.5 VM3 CMRR and AOL

5.0 VM4

1.8 VDD/3 VM5 VOS and PSRR

0.3 VM6 CMRR and AOL

1.5 VM7

-40 5.5 VDD/3 VM8 VOS at temperature and ΔVOS/ΔTA

+85 VDD/3 VM9

+125 VDD/3 VM10

Note 1: VSS =GND=0V. V

CM = OFF means that the its power supply is off (VCM =V

DD/2).

VOUT ≈VCM.

MCP6V01 Input Offset Demo Board User’s Guide

TABLE 2-2: ESTIMATES

Obviously , other values of TA, VDD, … can be used instead, with the proper adjustments

to these equations.

2.7 REDUCING THE MEASUREMENT NOISE

The noise seen in the measurements is a result of the design choices made for the

MCP6V01 Input Of fset Demo Board. The component s R12 and C5 set a lowp ass pole

at 0.16 Hz, which gives reasonable noise performance (±0.2 µVPK referred to the input

of the DUT) and settling time (1 to 2 seconds).

To achieve lower noise in your results, average many measurement s together. For

instance, measuring the output (VM–V

DD/2) once a second for 16 seconds (16

samples) should produce an estimate with noise √16 = 4 times lower (i.e., ±0.05 µVPK).

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 0.16 Hz causes closely

spaced samples to be correlated . To avoid the overhe ad cause d by sampling too fast,

keep the sampling period ne ar or above the pole’s time constant (1.0s); this gives a

minimum sample rate of 1 sample per second.

Operating Inputs Estimate

VDD

(V) TA

(°C) Equations (Note 1) Units

1.8 and 5.5 -40 to +125 1/AOL = 0, by assumption µV/V

+25 1/PSRR = (VOST_2 –V

OST_5)/(3.7V) µV/V

5.5 -40 VOS =V

OST_8 µV

+25 VOS =V

OST_2 µV

+85 VOS =V

OST_9 µV

+125 VOS =V

OST_10 µV

-40 to +125 ΔVOS/ΔTA=(V

OST_10 –V

OST_8) / (165°C) µV/°C

+25 1/CMRR = {(VOST_4 –V

OST_3)/(4.5V) µV/V

1.8 +25 VOS =V

OST_5 µV

1/CMRR = (VOST_7 –V

OST_6)/(1.2V) µV/V

Note 1: VOST_k is calculated from VMk using Equation 2-1.

Note: Sampling much faster than 1 SPS will not improve the averaged noise of

this board’s output significantly.

MCP6V01 INPUT OFFSET

DEMO BOARD USER’S GUIDE

Chapter 3. Possible Modifications

3.1 INTRODUCTION

This chapter shows simple modifications to the MCP6V01 Input Offset Demo Board:

• Changing the DUT

• Connecting a Chip Select Pin to Ground

3.2 CHANGING THE DUT

Change the DUT (see Figure 3-1) to the MCP6V06 Op Amp as follows:

1. Remove U1 from the PCB, using a de-soldering tool.

2. Solder a MCP6V06 op am p in its place. Use a MCP6V06 in a SOIC- 8 package.

Pin 1 is next to the U1 reference designator on the PCB (not next to the DUT

label)

FIGURE 3-1: Location and Orientation of DUT.

Label DUT’s Pin 1 Reference Designator

MCP6V01 Input Offset Demo Board User’s Guide

3.3 CONNECTING A CHIP SELECT PIN TO GROUND

The DUT can be changed to the MCP6V03 or MCP6V08 op amps with chip select. If

desired, their Chip Se lect pin (p in 8) can be forced to ground. This is done as follows

(see Figure 3-2):

1. Solder one end of a wire to the DUT’s pin 8. Pin 8 is next to the U1 reference

designator on the PCB (not next to the DUT label)

2. Solder the other end of the wire the closest ground via on the PCB. The striped

green arrow to the ri ght in the figure shows the location. The solid green curve

represents the wire.

FIGURE 3-2: Location and Orientation of DUT.

DUT’s Pin 8 Ground Via

MCP6V01 INPUT OFFSET

DEMO BOARD USER’S GUIDE

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

This appendix contains the schematics and layouts for the MCP6V01 Input Offset

Demo Board.

The Gerber files for this board ar e available on the Microchip website

(www.microchip.com) and are contained in the “00227R3_Gerbers.zip” zip file .

A.2 SCHEMATIC

See below the circuit diagram. On the left is the DUT (U1), which produces the common

mode voltage plus the DUT’s input offset (VOS) times a gain. In the middle is the

difference amplifier that amplifies and level shifts th e DUT’s output minus the

mid-supply reference volt age. On the top ri ght is the mid-supply reference (VDD/2) and

buffer. On the middle right is the common mode voltage reference (VCM) with buffer.

On the bottom are the supply bypass capacitors and filter resistors.

MCP6V01 Input Offset Demo Board User’s Guide

A.2 BOARD SCHEMATIC (Continued)

Schematics and Layouts

A.3 COMBINATION OF THE TOP SILK SCREEN AND TOP METAL LAYERS

A.4 TOP SILK SCREEN

MCP6V01 Input Offset Demo Board User’s Guide

A.5 TOP METAL LAYER

A.6 BOTTOM METAL LAYER

MCP6V01 INPUT OFFSET

DEMO BOARD USER’S GUIDE

Appendix B. Bill Of Materials (BOM)

B.1 MCP6V01 INPUT OFFSET DEMO BOARD BOM

The BOM in Table B-1 corresponds to Figure 2-1; it shows all of the components

assembled on the PCB. Table B-2 shows additional parts that come in the ESD

protection bag that the user, if needed, installs.

TABLE B-1: BILL OF MATERIALS FOR ASSEMBLED PCB

TABLE B-2: BILL OF MATERIALS FOR LOOSE PARTS IN BAG

Qty Reference Description Manufacturer Part Number

7 C3, C4, C7, C10,

C14, C17, C18 100 nF, 0603 SMD, X7R, 16V, 10% Panasonic®-ECG ECJ-1VB1C104K

5 C1, C2, C8, C13, C16 1.0 µF, 1206 SMD, X7R, 16V, 10% ECJ-3YB1C105K

5 C5, C6, C9, C11 , C15 10 µF, 1206 SMD, X7R, 16V, 10% ECJ-3YX1C106K

1 C12 100 µF, Radial, Electrolytic, 10 V, 20% EEU-FC1A101S

1 PCB 2 layer PCB (2.20 in × 2.00 in) n/a n/a

2 R7, R10 33.2 kΩ, 0603 SMD, 0.1%, 25 ppm/°C,

1/10W Susumu Co. Ltd. RG1608P-3322-B-T5

2 R8, R11 332 k Ω, 0603 SMD, 0.1%, 25 ppm/°C,

1/10W RG1608P-3323-B-T5

3 R23, R24, R25 10.0Ω, 0603 SMD, 1%, 1/10W Panasonic-ECG ERJ-3EKF10R0V

2 R1, R2 20.0Ω, 0603 SMD, 1%, 1/10W ERJ-3EKF20R0V

2 R21 , R22 49.9Ω, 0603 SMD, 1%, 1/10W ERJ-3EKF49R9V

1R4 1.00kΩ, 0603 SMD, 1%, 1/10W ERJ-3EKF1001V

2 R5, R9 3.01 k Ω, 0603 SMD, 1%, 1/10W ERJ-3EKF3011V

1 R19 10.0 kΩ, 0603 SMD, 1%, 1/10W ERJ-3EKF1002V

5 R6, R12, R15, R16,

R20 100 kΩ, 0603 SMD, 1%, 1/10W ERJ-3EKF1003V

2 R17 , R18 182 kΩ, 0603 SMD, 1%, 1/10W ERJ-3EKF1823V

1 R3 196 kΩ, 0603 SMD, 1%, 1/10W ERJ-3EKF1963V

2 R13 , R14 200 kΩ, 0603 SMD, 1%, 1/10W ERJ-3EKF2003V

2 U1, U2 MCP6V01, SOIC-8, Single Op Amp Microchip

Technology Inc. MCP6V01-E/SN

1 U3 MCP6002, SOIC-8, Dual Op Amp MCP6002-E/SN

7 TP1 – TP7 SMD, Test Point Keystone

Electronics®5016

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.

Qty. Reference Designator Description Manufac turer Part Number

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

Nylon, 0.285" max. O.D. Keystone

Electronics 1902C

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

1/4" long, Nylon Building

Fasteners NY PMS 440 0025 PH

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03/26/09