MCP3201/02 and MCP3204/08 ADC Daughter Board User's …ww1.microchip.com/downloads/en/DeviceDoc/51220a.pdfMCP3202 Analog to Digital Converters. • Display data from conversions on

MCP3201/02 AND MCP3204/08 ADC DAUGHTER BOARD USER’S GUIDE

Information contained in this publication regarding device applications and the like is intended by way of suggestiononly. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated withrespect to the accuracy or use of such information. Use of Microchip’s products as critical components in life supportsystems is not authorized except with express written approval by Microchip.

2000 Microchip Technology Incorporated. All rights reserved.

The Microchip logo, name, PIC, and PICmicro are registered rademarks of Microchip Technology Incorporated in theU.S.A. and other countries. All product/company trademarks mentioned herein are the property of their respective com-panies. FilterLab is a trademark of Microchip Technology in the U.S.A. and other countries.

2000 Microchip Technology Inc. DS51220A

Daughter Board User’s Guide

DS51220A 2000 Microchip Technology Inc.

DAUGHTER BOARD USER’S GUIDE

Table of Contents

Chapter 1. Introduction1.1 Overview ......................................................................................... 1

1.2 Features .......................................................................................... 1

Chapter 2. Getting Started

2.1 Preparation for Using the MCP3201/3202 or MCP3204/3208 Daughter Boards ............................................................................. 3

Chapter 3. MCP3201/3202 Daughter Board

3.1 Description ...................................................................................... 7

3.2 Features .......................................................................................... 7

3.3 Layout Overview ............................................................................. 8

3.4 Configuring the Daughter Board Jumpers ...................................... 9

3.5 RC Network .................................................................................. 13

Chapter 4. MCP3204/3208 Daughter Board4.1 Description .................................................................................... 15

4.2 Features ........................................................................................ 15

4.3 Layout Overview ........................................................................... 16

4.4 Configuring the Daughter Board Jumpers .................................... 17

4.5 RC Network .................................................................................. 23

Chapter 5. Filter Boards5.1 Overview ....................................................................................... 25

5.2 Selecting Components for the Filter Board ................................... 26

Chapter 6. Using the Daughter Boards with the Analog Driver Board6.1 Using the Analog Driver Board to Set the ADC Configuration ...... 27

Chapter 7. ADC Evaluation Software7.1 Control Bar .................................................................................... 31

7.2 Display Windows .......................................................................... 36

2000 Microchip Technology Inc. DS51220A-page iii


Appendix A. MCP3201/3202 Schematics and Board LayoutsA.1 MCP3201/3202 Schematic ...........................................................44

A.2 Silkscreen .....................................................................................45

A.3 Top Layer .....................................................................................45

A.4 Bottom Layer ................................................................................45

Appendix B. MCP3204/3208 Schematics and Board LayoutsB.1 Schematic .....................................................................................48

B.2 Silkscreen ......................................................................................49

B.3 Top Layer ......................................................................................49

B.4 Bottom Layer .................................................................................49

Appendix C. Filter Board Schematics and Board Layouts

C.1 Schematic .....................................................................................51

C.2 Layout ...........................................................................................51

Worldwide Sales and Service ................................................................. 54

DS51220A-page iv 2000 Microchip Technology Inc.

DAUGHTER BOARD USE R’S GUIDE

Chapter 1. Introduction

1.1 OverviewThe MCP3201/3202 and MCP3204/3208 daughter boards are designed to be used as an evaluation and demonstration tool for Microchip Technology’s stand-alone Serial Analog-to-Digital Converters (ADC). These boards were designed to be as versatile as possible while maintaining the requirements to handle accurate analog measurements.

The MCP3201/3202 and MCP3204/3208 daughter boards were designed to be used in conjunction with the Analog Evaluation Driver Board (available separately). When connected to the Driver Board with the included microcontroller installed, these daughter boards allow the user to examine conversion results from any of the Analog-to-Digital Converters. The included ADC Evaluation Software is part of Microchip Technology’s Analog Tool Suite software. The software allows the user the ability to select the proper ADC, choose channel configuration and show conversion results in a series of different display screens. This software provides tools to the system designer to evaluate ADC and circuit performance and ultimately produce faster design cycles.

1.2 FeaturesSome of the more important features available on the Analog Driver Board are listed below:

• Sockets for PIC16C63, PIC16C54 and PIC12C5XX

• RS-232 connections to PIC16C63 socket

• On board SRAM for storing data

• LCD display module

• Prototyping area

• Sockets for serial EEPROMs for storing calibration data

• Socket for 4-digit LED display module

2000 Microchip Technology Inc. DS51220A-page 1


NOTES:

DS51220A-page 2 2000 Microchip Technology Inc.


Chapter 2. Getting Started

2.1 Preparation for Using the MCP3201/3202 or MCP3204/3208 Daughter Boards

The MCP3201/3202 and MCP3204/3208 daughter boards were designed to be used in conjunction with the Analog Evaluation Driver Board (available separately). Before using the daughter boards in conjunction with the Driver Board, there are several things that must first be done:

• Install the ADC Evaluation System Microcontroller into the Driver Board.

• Install the ADC Evaluation System Software (optional).

• Connect the Daughter Board to Driver Board.

Each of these steps are explained in detail in the next sections.

2.1.1 Installing the Microcontroller in the Analog Evaluation Driver BoardIf you are planning to use the MCP3201/3202 or MCP3204/3208 daughter board with the Analog Evaluation Driver Board and the included software, you must first install the included microcontroller in the Analog Driver board. If any other microcontrollers have been installed in the Driver Board, these must first be removed before installing the new device and powering up the system. MAKE SURE THAT POWER IS NOT APPLIED TO THE DRIVER BOARD WHEN REMOVING OR INSTALLING THE MICROCRONTROLLER. Refer to the Analog Driver board diagram below and install the microcontroller as shown into the socket labeled U7. Press the microcontroller firmly into the socket.



Figure 2.1: Installing ADCES Microcontroller on Driver Board

2.1.2 Loading the SoftwareIn order to use the MCP3201/3202 or MCP3204/3208 daughter board with the supplied ADC Evaluation Software, this program and its components must first be loaded onto a suitable computer. Requirements are Windows® 95 or higher, 16 MB of RAM and 10 MB of hard disk space free. There also must be a serial port available to connect the PC to the Driver Board.

To install the software, insert the supplied CD-ROM into the CD-ROM drive. The install program will start automatically and take you through the steps necessary to load the program. There are also files on the CD-ROM that contain layout files for the boards as well as gerber files if a user is interested in getting blank boards created.

Power

Regulator

SRAM

Address counter 1

Address counter 2

2 x 16 LCD Display

2 x 25 Pin D

aughter Board C

onnector

Prototype Area

XTAL

SPIEEPROM

I2CEEPROM

RS-232Connector

Connections/

MCLR

SW1

SW2

4 Digit LED Display Below

PIC16C54 PIC12CXX

U7Pin 1

Pin 1


Getting Started

2.1.3 Connecting a Daughter Board The daughter board is connected to the Driver Board with a 50-pin header connector as shown in Figure 2.2.

Figure 2.2: Connecting Daughter Board to Driver Board

The daughter board connector is a 50-pin, dual-row header. The male connector is on the Driver Board and the female header is on the daughter board. A diagram of the connections is shown in Figure 2.3.

Figure 2.3: Daughter Board Connector (J1)

Driver Board

Daughter Board

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50

+9V

SCL/SCK

SDA/SDI

SDO (MCU)

63 R

A0

54 R

A0

12C50

8 GP0

54/6

3 RB0

54/6

3 RB1

54/6

3 RB2

54/6

3 RB3

54/6

3 RB4

54/6

3 RB5

54/6

3 RB6

54/6

3 RB7

63 R

A1

63 R

A2

63 R

A3

63 R

A4

63 R

A5

63 R

C0

63 R

C1

DGND

DGND

+5V

DGND

DGND

DGND

DGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND+5

V+5

V+5

V+9

V



NOTES:




3.1 DescriptionThe MCP3201/3202 ADC daughter board is designed to be used with the Analog Evaluation Driver Board. The user can use it as a stand-alone board by adding additional circuitry either on the prototype area or on another board. When used in conjunction with the driver board and the supplied software, this board can be used to evaluate the MCP3201/3202 Analog-to-Digital Converter devices and can be used to evaluate signals applied to the ADC.

3.2 FeaturesThe MCP3201/3202 ADC daughter board provides the following features:

• Allows single or continuous conversions for either the MCP3201 or MCP3202 Analog to Digital Converters.

• Display data from conversions on PC in the following formats:

- Real-time numeric- Real-time strip chart- FFT- Histogram- Scopeplot- Data list

• Signal source can be selected as DC signal from on-board potentiome-ter or an externally supplied signal

• Prototype area available for circuit evaluation

• Low-pass filter boards supplied for filter analysis



3.3 Layout OverviewThe MCP3201/3202 ADC daughter board is laid out for maximum flexibility. Basic signal path flow from the signal source to the ADC is shown below in Figure 3.1. When using the MCP3201, the board allows signal connections to the two pseudo-differential inputs: IN+ and IN-. When using the MCP3202, the signal connections are made to the CH0 and CH1 inputs.

Figure 3.1: Basic Signal Chain for MCP3201/3202 Daughter Board

ADC

External Signal Source

POT A

VDDReference Select Jumper

VREF

VDD

External VREF

Source

potentiometersignal enable

Jumper

RC NetworkIN+/CH0

IN-/CH1

BufferAmp

Signal Select Jumper

RC NetworkBufferAmpSignal

Select Jumper


POT B

VDD

A

B


Jumper

4.096VReference

JP1

JP5

JP2

JP3

JP4


MCP3201/3202 Daughter Board

3.4 Configuring the Daughter Board JumpersThere are five jumpers that must be set for proper operation of the MCP3201/3202 daughter board. Four of these jumpers determine the signal path to the ADC and one jumper determines the source of the ADC reference voltage.

Figure 3.2: Jumper Locations on the MCP3201/3202 Daughter Board

B

A

JP5B

AJP1

JP3

JP2

JP4

AGNDOPAR/CPROTO

AGNDOPAR/CPROTO

VCCVREFPROTO

JP3

AGNDOPAR/CProto

JP3: ADC Input source selection for IN- connection (MCP3201 or CH1 connection (MCP3202)

= input connected to ground= input connected to Opamp output= input connected to output of RC network= input connected to ‘B PROTO” trace in proto area

JP2

GNDOPAR/CProto

JP2: ADC Input source selection for IN+ connection (MCP3201 or CH0 connection (MCP3202)

= input connected to ground= input connected to Opamp output= input connected to output of RC network= input connected to ‘A PROTO” trace in proto area

JP4

VccVrefProto

JP4: Reference voltage source selection for MCP3201

= reference voltage pin connected to Vcc= reference voltage pin connected to 4.096V = reference voltage pin connected to ‘VPROTO’ trace in proto area

MCP602

MCP602

MC

P32

02M

CP

3201

RE

F19

8(4

.096

V)

JP5: Signal source selection for IN- connection (MCP3201 or CH1 connection (MCP3202)

= signal source connected to solder tab ‘B’

= signal source connected to potentiometer (POT B)

JP1: Signal source selection for IN+ connection (MCP3201) or CH0 connection (MCP3202)

= signal source connected to solder tab ‘A’

= signal source connected to potentiometer (POT A)

POTA

POTB

Solder TabB

Solder TabA

Note: Do not populate the MCP3201 and MCP3202 sockets atthe same time.

Note: Do not install both the MCP3201 and MCP3202 at the same time



3.4.1 Jumper JP1JP1 determines the input signal source of the ‘A’ input which is connected to the IN+ input on the MCP3201 and the CH0 input on the MCP3202. If the jumper is on, the input signal source is routed to potentiometer ‘A’. If jumper JP1 is not installed, then the potentiometer is bypassed and an external signal from solder pad A or the prototype area must be used.

Figure 3.3: JP1 Jumper Selections

3.4.2 Jumper JP2JP2 determines what the input of the ADC is actually connected to. This jumper is connected directly to the IN+ input pin on the MCP3201 and the CH0 input on the MCP3202. There are four choices for this jumper.

The four choices are:

• AGND: connects input to the analog ground plane

• OPA: connects input to the output of the buffer amplifier. This selection is also used when using the filter board (see Filter Board section)

• R/C: bypasses the amplifier and connects ADC input to the output of the RC network

• PROTO: connects input to the ‘A PROTO’ connection in the prototype area


JP1: Signal source selection for IN+ connection (MCP3201 or CH0 connection (MCP3202)



Note: There should never be more than one jumper installed on JP2 ordamage to circuits may occur.

JP2 selects the ADC Input source selection for IN+ connection (MCP3201) or CH0 connection (MCP3202)

AGNDOPAR/CPROTO

input connected to analog ground

GNDOPAR/CPROTO

input connected to Opamp output. Use this

AGNDOPAR/CPROto

input connected to output of RC network

AGNDOPAR/CPROTO

input connected to ‘A PROTO” trace in proto area

Note: If the potentiometer is used as the signal source and the op amp buffer (or some other type of buffering) is not used, this presents a high impedance signal source to the input of the ADC and may cause errors in the conversion results. when using filter board in op amp socket



3.4.3 Jumper JP3JP3 is identical in operation to JP2 except that this jumper is connected directly to the IN- input pin on the MCP3201 and the CH1 input on the MCP3202.


3.4.4 Jumper JP4JP4 is used to select the reference voltage into the ADC for the MCP3201. The MCP3202 uses VDD as the reference voltage so this jumper has no affect on the MCP3202. There are three choices for this jumper.

The three choices are:

• VCC: connects reference input to VCC

• VREF: connects reference input to the 4.096 voltage reference device

• PROTO: connects reference input to the ‘V Proto’ connection on the prototype area


JP3 selects the ADC Input source selection for IN- connection (MCP3201) or CH1 connection (MCP3202)

AGNDOPAR/CPROTO

input connected to ground

AGNDOPAR/CPROTO

AGNDOPAR/CPROTO


GNDOPAR/CPROTO

input connected to ‘B PROTO” trace in proto area

input connected to Opamp output. Use this when using filter board in op amp socket

Note: There should never be more than one jumper installed on JP4 ordamage to circuits may occur.

JP4 selects the ADC reference voltage source for the MCP3201 device.

VCCVREFPROTO

reference input connected to Vcc

reference input connected to ‘B PROTC” trace in proto area

reference input connected to the 4.096V reference deviceVCCVREFPROTO

VCCVREFPROTO



3.4.5 Jumper JP5JP5 is identical in operation to JP1, although it determines the signal source for the B input which is connected to the IN- input on the MCP3201 and the CH1 input on the MCP3202.


3.4.6 Channel Configuration ExampleIn the following example, the daughter board is configured using the MCP3202 ADC. Note that there is no device in the MCP3201 socket. For the ‘A’ signal path, the output of potentiometer ‘A’ is used as the signal source and is routed through the Opamp and into channel 0 of the ADC. For the ‘B’ signal, an external signal source is used (JP5 removed) and is routed into channel 1 of the ADC. The Opamp is bypassed in this case by setting the jumper JP3 to R/C. The reference voltage is the 4.096 volts.

Figure 3.8: Daughter Board Configuration Example

JP5: Signal source selection for IN- connection (MCP3201) or CH1 connection (MCP3202)



B

A

JP5B

AJP1

JP3

JP2

JP4

AGNDOPAR/CPROTO

AGNDOPAR/CPROTO

VCCVREFPROTO

MCP602

MCP602

RE

F19

8(4

.096

V)

POTA

POTB

MC

P32

02

ShortingJumpers

Signal fromExternal Source



3.5 RC Network The RC network connectors provided for both signal path ‘A’ and signal path ‘B’ allow the user to add resistor and capacitor components to the signal path. The connectors provide the means to attach the components without having to solder them on the board. The overall path for the RC network is shown below with the Opamp inserted in the socket. Note that the shorting jumper is installed when the board comes from the factory.

Figure 3.9: RC Network Layout

Z6 or Z

8

Z1 or Z

3

Z2 or Z

4

Z5 or Z

7

VD

D

AG

ND

AG

ND

Signal fromJP1 or JP5

To ADC

Input

AGNDAnalog OPA

R/CPROTO

To Proto Connectionin proto area on board

JP2or

JP3

This shorting jumper is installed at the factory

Socket for Opamp

VD

D

NC

NC

NC

AGND



NOTES:




4.1 DescriptionThe MCP3204/3208 ADC daughter board is designed to be used with the Analog Evaluation Driver board. The user can use it as a stand-alone board by adding additional circuitry either on the prototype area or on another board. When used in conjunction with the driver board and the supplied software, this board can be used to evaluate the MCP3204/3208 Analog to Digital Converter devices and can be used to evaluate signals applied to the ADC.

4.2 FeaturesThe MCP3204/3208 ADC daughter board provides the following features:

• Allows single or continuous conversions for either the MCP3204 or MCP3208 Analog-to-Digital Converters.

• Display data from conversions on PC in the following formats:

- Real-time numeric- Real-time strip chart- FFT- Histogram- Scopeplot- Data list

• Signal source can be selected as DC signal from on-board potentiome-ter or an externally supplied signal

• Prototype area available for circuit evaluation

• Low-pass filter boards supplied for filter analysis



4.3 Layout OverviewThe MCP3204/3208 ADC daughter board is laid out for maximum flexibility. This board allows signal connections to each of the analog inputs and can be used in both pseudo differential or single ended mode.

Figure 4.1: Basic Signal Chain for MCP3204/3208 Daughter Board

ADC


POT A

VDDReference

Select Jumper

VREF

VDD

External Vref

Source


Jumper

RC Network

CH7

BufferAmp


RC NetworkBufferAmp



POT B

VDD

A

B


Jumper

4.096VReference

JP1

JP5

JP2

JP3

JP4

CH5CH4CH1

CH6CH4CH2CH0

ChannelSelect

Jumpers

JP7

JP6



4.4 Configuring the Daughter Board JumpersThere are eight jumpers that must be set for proper operation of the MCP3204/3208 daughter board. One jumper selects the ADC installed as the MCP3204 or the MCP3208. Six of these jumpers determine the signal path to the ADC. Another jumper determines the ADC reference voltage source. The same socket is used for both the MCP3204 or the MCP3208. Pin 1 on the device needs to be lined up with pin 1 on the socket in either case.

Figure 4.2: Jumper Locations on the MCP3204/3208 Daughter Board

B

A

JP5B

AJP1

JP3

JP2

JP4

AGNDOPAR/C

VDDVREFPROTO

AGNDOPAR/C

JP3: ADC Input source selection for odd channels

= input connected to analog ground= input connected to Opamp output= input connected to output of RC network

JP2

AGNDOPAR/C

JP2: ADC Input source selection for even channels

= input connected to analog ground= input connected to Opamp output= input connected to output of RC network

VD

DV

RE

FP

roto

JP4:

Ref

eren

ce v

olta

ge s

ourc

e se

lect

ion

= r

efer

ence

vol

tage

pin

con

nect

ed to

VD

D=

ref

eren

ce v

olta

ge p

in c

onne

cted

to 4

.096

V

= r

efer

ence

vol

tage

pin

con

nect

ed to

‘VR

EF’ t

race

in p

roto

are

a

MCP602

MCP602

MC

P32

04/0

8R

EF

198

(4.0

96V

)JP5: Signal source selection for channels 1,3,5 and 7



JP1: Signal source selection for channels 0,2,4 and 6



POTA

POTB

Solder TabB

Solder TabA

AGNDOPAR/C

JP7

JP6

CH7CH5CH3CH1

CH6CH4CH2CH0

CH6CH4CH2

JP6: Channel selection for ‘A’ Input signal

= ‘A’ input signal connected to channel 6= ‘A’ input signal connected to channel 4= ‘A’ input signal connected to channel 2

CH0 = ‘A’ input signal connected to channel 0

CH7CH5CH3

JP7: Channel selection for ‘B’ Input signal

= ‘B’ input signal connected to channel 7= ‘B’ input signal connected to channel 5= ‘B’ input signal connected to channel 3

CH1 = ‘B’ input signal connected to channel 1

32083204JP8

JP8: Selects MCP3204 or MCP3208

= MCP3204

= MCP3208



Jumper JP1JP1 determines the input signal source of the ‘A’ input which is connected to the even numbered input channels on the MCP3204/3208. If the jumper is on, the input signal source is routed to potentiometer ‘A’. If jumper JP1 is not installed, then the potentiometer is bypassed and an external signal from solder pad A or the prototype area must be used.


4.4.1 Jumper JP2JP2 determines what the input of the ADC is actually connected to. This jumper is connected directly to even-numbered channels on the MCP3204/3208. There are three choices for this jumper.

• AGND: connects input to the analog ground plane

• OPA: connects input to the output of the buffer amplifier

• R/C: bypasses the amplifier and connects the ADC input to the output of the RC network


JP1: Signal source selection for even numbered channels

= signal source connected to solder pad ‘A’


Note: There should never be more than one jumper installed on JP2 ordamage to circuits may occur. The four choices are:

JP2 selects the ADC Input source selection for the even numbered input channels

AGNDOPAR/C input connected to analog ground


AGNDOPAR/C

AGNDOPAR/C

Note: If the potentiometer is used as the signal source and the op amp buffer (or some other type of buffering) is not used, this presents a high impedance signal source to the input of the ADC and may cause errors in the conversion results. input connected to Opamp output. Use this

when using filter board in op amp socket



4.4.2 Jumper JP3JP3 is identical in operation to JP2 except that this jumper is connected directly to odd-numbered input channels of the ADC.


4.4.3 Jumper JP4JP4 is used to select the reference voltage into the ADC for the MCP3204/3208. There are three choices for this jumper. Note: there should never be more than one jumper installed on JP4 or damage to circuits may occur. The three choices are:

• VDD: connects reference input to VDD

• VREF: connects reference input to the 4.096 voltage reference device

• PROTO: connects reference input to the ‘VREF’ connection on the prototype area


JP3 selects the ADC Input source selection for the even numbered analog input channels

AGNDOPAR/C input connected to analog ground


GNDOPAR/C

GNDOPAR/C

Note: If the potentiometer is used as the signal source and the op amp buffer (or some other type of buffering) is not used, this presents a high impedance signal source to the input of the ADC and may cause errors in the conversion results.

input connected to Opamp output. Use this when using filter board in op amp socket

JP4 selects the ADC reference voltage source for the MCP3201 device.

VCCVREFPROTO

reference input connected to Vcc

reference input connected to ‘B PROTC” trace in proto area

reference input connected to the 4.096V reference deviceVCCVREFPROTO

VCCVREFPROTO



4.4.4 Jumper JP5JP5 is identical in operation to JP1, although it determines the signal source for the ‘B’ input which is connected to the odd-numbered analog input channels on the MCP3204/3208.


4.4.5 Jumper JP6JP6 is used to direct the signal ‘A’ to one or more of the even numbered channels on the MCP3204/3208.


JP5: Signal source selection for ‘B’ input



JP6 selects the which channel(s) the ‘A’ input signal is routed to.

CH6CH4CH2CH0

Signal ‘A’ is connected to channel 6

CH6CH4CH2CH0

CH6CH4CH2CH0

CH6CH4CH2CH0






4.4.6 Jumper JP7JP7 is used to direct the signal ‘B’ to one or more of the odd-numbered channels on the MCP3204/3208.


4.4.7 Jumper JP8JP8 is used to determine whether the MCP3204 or the MCP3208 is being used on the board. The same socket is used for both devices. When installing the device, make sure that pin 1 on the device lines up with pin 1 on the socket in either case.


JP7 selects the which channel(s) the ‘B’ input signal is routed to.

CH7CH5CH3CH1

Signal ‘B’ is connected to channel 7




CH7CH5CH3CH1

CH7CH5CH3CH1

CH7CH5CH3CH1

JP8 selects between the MCP3204 or MCP3208 device

MCP3204 is selected

3204 3208JP8

3204 3208JP8

MCP3208 is selected



4.4.8 Channel Configuration ExampleIn the following example, the daughter board is configured to use an MCP3208 and get the output of potentiometer ‘A’ through the Opamp and into channel 0 of the ADC. For the ‘B’ signal path, an external signal source is used (JP5 removed) and is routed directly into channel 5 of the ADC. The Opamp is bypassed by setting jumper JP3 to ‘R/C.’ The reference voltage is set to 4.096 volts.

Figure 4.11: Daughter Board Configuration Example

B

A

JP5B

AJP1

JP3

JP2

JP4

AGNDOPAR/C

VDDVREFPROTO

MCP602

MCP602

MC

P32

08R

EF

198

(4.0

96V

)

POTA

POTB

AGNDOPAR/C

JP7

JP6

CH7CH5CH3CH1

CH6CH4CH2CH0

External

is the signal Sourcefor Channel 0

Potentiometer ‘A’

JumpersShorting

Signal Source

32083204JP8



4.5 RC Network The RC network connectors provided for both signal path ‘A’ and signal path ‘B’ allow the user to add resistor and capacitor components to the signal path. The connectors provide the means to attach the components without having to solder them on the board. The overall path for the RC network is shown below with the Opamp inserted in the socket. Note that the shorting jumper is installed when the board comes from the factory.

Z6 or Z

8

Z1 or Z

3

Z2 or Z

4

Z5 or Z

7

VD

D

AG

ND

AG

ND

Signal fromJP1 or JP5

To ADC

Input

AGNDAnalog OPA

R/CPROTO

To Proto Connectionin proto area on board

JP2or

JP3

This shorting jumper is installed at the factory

Socket for Opamp

VD

D

NC

NC

NC

AGND



NOTES:



Chapter 5. Filter Boards

5.1 OverviewTwo Analog Filter boards are provided with each daughter board so that the user has the option of experimenting with analog filters in the signal path. A filter board is meant to be used by inserting it into the Opamp socket after the Opamp has been removed. See Figure 5.1. Keep in mind that when using the Filter Board, the R/C network section must be configured so that the signal passes through the Opamp (filter).

Figure 5.1: Inserting Filter Board into Opamp Socket

Filter Board

MCP3201/02 or

R/C NetworkSections

OpampSockets with

MCP3204/08Daughter Board

Op AmpRemoved

Stand-off legs mustbe installed by user



5.2 Selecting Components for the Filter BoardThe filter board layout is shown in Figure 5.2 and allows the user to construct their own filter and insert it into the signal path. The filter board allows construction of low pass filters (up to 4th order) in the Sallen-Key configuration. The only component that is populated is the Opamp. The stand-off legs are provided for insertion into the socket, but the user must install them. Microchip’s FilterLab™ program is an excellent tool for designing filters and will create component values for this filter board based on your filter parameters. The FilterLab program is available free of charge from Microchip’s web site at www.microchip.com.

Figure 5.2: Filter Board Layout (Sallen-Key Configuration)



Chapter 6. Using the Daughter Boards with the Analog Driver Board

6.1 Using the Analog Driver Board to Set the ADC Configuration

6.1.1 Power-up StateWhen the MCP3201/3202 or MCP3204/3208 daughter board is connected to the Driver Board (with the ADC Evaluation System microcontroller installed) and it is powered up, the LCD display will look similar to what is shown below in Figure 6.1. From this point, it is possible to change the ADC device number and the channel configuration using the switches on the Driver Board SW1 and SW2. See the next sections for details on selecting a device and input channel configuration. The microcontroller is constantly sampling the ADC selected in the LCD Display and when it is properly configured will show the ADC conversion results. The sampling rate is approximately 10 Hz. As shown in the diagram below, the ADC conversion results will be shown in Binary, Hex and decimal formats.

Figure 6.1: Power-Up state of LCD display on Analog Driver Board

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Device Number Conversion Resultin Binary Format

ChannelSelection

Channel configurationas single-ended (SNGL)

or pseudo-differential (PDIF)

Conversion Resultin Decimal Format

Conversion Resultin Hex Format



6.1.2 Changing the Device numberPressing the switch SW1 on the analog driver board will cause the display to cycle through all the ADC part numbers. See Figure 6.2.

Figure 6.2: Using the Push Buttons to Set Device Number

MCLR

SW1

SW2

Pushing SW1 will cycle through all the ADC device numbers

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Using the Daughter Boards with the Analog Driver Board

6.1.3 Changing the Channel ConfigurationPressing the switch SW2 on the analog driver board will cause the display to cycle through all the channel configurations based on the ADC part number that has been selected. See Figure 6.3.

Figure 6.3: Using the Push Buttons to Set Channel Configuration

MCLR

SW1

SW2

Pushing SW2 will cycle through all the channel configurations

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Chapter 7. ADC Evaluation Software

7.1 Control BarWhen the ADC Evaluation Software program is executed, the first thing you will see is the Control Bar at the top of the screen. The pull-down menus and control buttons on the Control Bar allow set up of the ADC configuration, selection of the data display window and provides the status of the system.

7.1.1 Control Bar FunctionsThe Control Bar functions are shown below in Figure 7.1. Some of the controls will change depending on what operational mode you have selected. Each of the controls is explained in detail in the following sections.

Figure 7.1: Control Bar Controls

Save and load data sets from a file

Sets Comm port for RS-232 communication

Starts continuous ADC conversions for all sample modes

Stops ADC conversions progress

Starts a single ADC conversions for the Real-Time sample modes

Selects which ADC is being used

Selects which windows are visible to observe and analyze data

Selects sample mode as acquisition, real time or trigger mode

Selects which ADC input channel to sample

Status window-shows status of system



7.1.2 Selecting the Comm PortA Comm port must be selected before the PC can communicate with the Driver Board. The communication port is selected by using the Communication pull-down menu as shown in Figure 7.2. When the port is selected, a check code is transmitted to the Driver Board to validate communication. If communication is validated, the message box shown in Figure 7.3 will be seen, otherwise an indication that communication could not be established will be seen. It may be necessary to press the MCLR switch on the Driver Board to initially get successful communication.

Figure 7.2: Selecting the Comm Port

Figure 7.3: Successful Comm Port Connection


ADC Evaluation Software

7.1.3 Selecting the Sample ModeThe sample mode selection determines how the system gets data from the ADC and how this data can be displayed. It is selected by using the Sample Mode pull-down menu on the Control Bar as shown in Figure 7.4. The sample mode will also change automatically whenever one of the display windows is selected with the mouse. The three sample mode selections are: Real-Time, Acquisition, and Trigger.

Figure 7.4: Selecting The Sample Mode

7.1.3.1 Real Time Mode

In Real-Time Mode, the ADC input channel is sampled and the data is immediately transmitted for display on the PC. The display options for this mode are the Numeric Real-Time Display or the Numeric Strip Chart Display. The relative conversion speed can be controlled by the speed selection control on the Control Bar. The actual conversion speed will vary depending on the type of computer is used. The conversion process is started by clicking the GO button for multiple conversions or the ‘Single Shot’ button for a single conversion.

Figure 7.5: Control Bar Controls for Real Time Mode

Selects Real Time Acquisition mode

Selects conversion speed for acquisitions

Starts continuous acquisitions

Stops continuous acquisitions

Starts a single acquisitions



7.1.3.2 Acquisition Mode

In Acquisition Mode, the ADC input channel is sampled and the data from each conversion is temporarily stored in the SRAM on the control board. When all conversions are complete, the data is uploaded to the PC for display and analysis. Display options for this mode are the Histogram, FFT, Scopeplot and Data List windows. The conversion process is started by clicking the GO button.

Figure 7.6: Control Bar Controls for Acquisition Mode

7.1.3.3 Trigger Mode

In Trigger Mode, operation of the system is identical to that of Acquisition Mode, except that when the Go button is pressed, the system will configure for an acquisition but it will wait on the trigger. The trigger is provided by the SW1 switch being pressed or an external signal connected to SW1. When the trigger is received (high-to-low transition) then the acquisition will begin.

Figure 7.7: Trigger Mode

Select Acquisition mode

Selects single or continuous acquisitions Acquisition mode

Selects number of data points to acquire

Selects conversion speed for acquisitions

Start Acquiring



7.1.4 Selecting the ADC Input ChannelWhen preparing to do data acquisitions, the input channel must be configured before conversions can be done. For the MCP3201, there is no channel configuration necessary as this menu is disabled. The channel configuration window allows the user to select the input channel for the ADC that will be sampled. Each device allows the selection of single ended or pseudo-differential mode. The window shown on the left in Figure 7.8 is for single ended mode and the menu on the right is for pseudo-differential mode selection. If single ended mode is chosen then the channel number is selected. Note that all channels are not available on all devices and the window selections will reflect that. If the pseudo-differential mode is chosen, then the polarity of the channel pairs must be chosen as well. See the device data sheets for more details.

Figure 7.8: ADC Input Channel Configuration Window

Note: A change in configuration is not executed until the ‘Apply Configu-ration’ button is pressed.

Single Ended Selections Pseudo-Differential Selections



7.2 Display Windows

7.2.1 Real-Time Numeric Display WindowThe Real-Time Numeric Display window is used to show the results of a single or continuous conversion as they are transmitted from the ADC. See Figure 7.9. The value is displayed in Decimal, Hex and Binary formats. Each time a conversion is completed, the display will be updated. The sample speed can be changed using the speed control in the Control Bar.

A second set of values is provided to observe the affects of averaging. See Figure 7.10. To use the averaging function, a check box is provided to enable this function. When enabled, averaging will take place after each conversion. If the arithmetic average is chosen, then conversions will be added until the ‘Counts’ value has been reached, at which time the total sum will be divided by the ‘Counts’ value, and the mean values displayed. Note that for this averaging method, the average display values are only updated after the number of conversions has reached the value in ‘Counts’. If this number is high and the sampling speed is slow, then the averaged value display may take a long time before it is updated. If the rolling average mode is enabled, the display is updated after every conversion based on the average of the last n conversions where n = ‘Counts’.

Figure 7.9: Real-Time Numeric Display Window

ADC Conversion Result

Enable/Disable Averaging Function



Figure 7.10: Using the Averaging Function

Averaged Results of ADC Conversion

Select number of conversions to be used in averaging function

Enable/Disable Averaging Function

Arithmetic Average adds n samples (Counts) and then divides to find the mean. It will update the display after every n samples is taken.

When rolling average mode is enabled, the display is updated after every conversion based on the average of the last n conversions where n = ‘Counts’.



7.2.2 Real-Time Strip Chart Display WindowThe Strip Chart display allows the user to observe the changing output of the ADC in a strip chart format. This display always shows the last 20 codes returned from the ADC. The Y axis can be locked to show a certain range of codes or can be set to automatically scale so that all codes in the buffer are visible. The buffer selection allows the user to choose how many codes on top of the largest code and how many codes below the smallest code are displayed. For example, if the buffer size is set to 10 codes, then the window will display 10 codes on top of the largest code and 10 codes below the smallest code captured in the present window.

Figure 7.11: Real-Time Strip Chart Display Window

Forces display to show a certain range of codes, independent on the actual codes being received. The range is set by the values in the Max Code and Min Code boxes.

Forces display to automatically adjust to the codes as they are displayed. The number of codes is determined by the buffer size

Results of last 20 conversions

Sets number of buffer codes to show above largest value and below smallest value

Digital Codes



7.2.3 Data Display WindowThe Data Display window is used to show the actual conversion values from the ADC. When an acquisition is completed, all the data values will be loaded into the table in the order that they were taken. Buttons at the bottom of the window allow the user to examine the data list in the actual order or sorted in ascending order. When the data is displayed in the actual order, the Min and Max values are indicated as well as the first occurrence of the Min and Max values.

Figure 7.12: Data Display Window

Data point values

Data point location

Minimum data point value in data set

Maximum data point value in data set

View the data set in the order that the data points were taken

View the data set sorted in ascending order

First occurrence of minimum data point value occurred at this data point

First occurrence of maximum data point value occurred at this data point

Remove all values from the current data display window

(in decimal)



7.2.4 FFT (Fast Fourier Transform) Display WindowThe FFT display window is used to display the Fast Fourier Transformation of the data in the frequency domain. This window is typically used to analyze AC signals or to help locate the source of AC noise.

Figure 7.13: FFT Display Window

Cursor coordinatesFFT Taper Window Selection



7.2.5 Histogram Display WindowThe Histogram display window allows the user to observe the data taken from a conversion and determine the relative variation of the digital codes. The histogram plot shows the digital codes on the X axis and the number of occurrences for each code on the Y axis. The statical values of the dataset are shown at the bottom of the window. The Span Control allows the user to lock in the number of codes shown on the X axis or allow the program to automatically scale the axis for every conversion.

Figure 7.14: Histogram Display Window

Forces display to show a certain range of codes, independent on the actual codes in the data set. The range is set by the values in the Max Code and Min Code boxes.

Forces the X axis to automatically adjust to show all codes between the smallest and largest code in the dataset.

Y-Axix shows the number of times a certain code is returned

X-Axis shows all the codes returned from the ADC at least once



7.2.6 Scope Plot Display WindowThe Scopeplot display window is used to show the results of a conversion with respect to time. This plot shows time on the X axis and the digital codes on the Y axis. Controls on the window allow the user to zoom in on both axis, automatically adjust the display based on the first data point taken or on the entire signal envelope.

When the cursor is over the plot area, a marker will appear that moves from data point to data point as the mouse is moved. Location of the marker is updated constantly in the ‘Marker’ frame in the lower right of the window. If the left mouse button is clicked, the marker position will lock and a crosshair cursor will appear. At this point, the crosshair will now follow the mouse movements and the Marker frame will show the distance between the locked marker and the crosshair.

Figure 7.15: Scopeplot Display Window

Select number of codes shown on the Y axis (Y axis zoom).

Selects chart to automatically center the signal envelope each time a new data set is displayed

Select number of codes shown on the X axis (X axis zoom).

Adjusts the current chart to center on the signal envelope

Adjusts the current chart to center on the first data point

Shows the actual data points as red markers



Appendix A. MCP3201/3202 Schematics and Board Layouts



A.1 MCP3201/3202 Schematic

VD

D8

CL

K7

DA

TA

6

CS

5V

SS4

VIN

-3

VIN

+2

VR

EF

1M

CP3

201

U1

MC

P320

1

3 21

8 4

U3

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AM

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TP1

VIN

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TP2

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1632

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S

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PZ

6

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8 4

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TP4

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T-

+5V

Z3

RE

S

Z4

RE

S

Z7

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PZ

8

CA

P

+5V

TP5

PRO

TO

VR

EF

+5V

JP4

VR

EF

+5V

VR

EF

TP6

SCK

TP7

SDI

TP8

SDO

TP9

VC

CT

P10

GN

D

TP1

1C

S

SCL

/SC

KSD

A/S

DI

AD

CS

SCL

/SC

KSD

A/S

DI

SDO

AD

CS

+5V

AG

ND

C1

10uF

+5V

C2

1uF

+5V

C3

1uF

+5V

C4

1uF

+5V

R2

2.5K

+5V

R4

2.5K

21

JP5

1632

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1

10K V

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10K

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6

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big

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

42 43 44 45 46 47 48

49 50

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MCP3201/3202 Schematics and Board Layouts

A.2 Silkscreen

A.3 Top Layer

A.4 Bottom Layer



NOTES:



Appendix B. MCP3204/3208 Schematics and Board Layouts



B.1 Schematic

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+5V

AG

ND

C1

10uF

+5V

C2

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+5V

C3

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+5V

R4

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1632

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+5V

+5V

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CS

SCL

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A/S

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SDO

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

42 43 44 45 46 47 48

49 50

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50

+5V

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+5V

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D

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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2

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63

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4

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C1

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4X

C0

C2

C4

C6

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C5

C7

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C2

C3

C4

C5

C6

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NC

8

NC

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P19

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P20

CH

5T

P21

CH

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P22

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7

C0

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C2

C3

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MCP3204/3208 Schematics and Board Layouts

B.2 Silkscreen

B.3 Top Layer

B.4 Bottom Layer



NOTES:



Appendix C. Filter Board Schematics and Board Layouts

C.1 Schematic

C.2 Layout

3

21

84

U1

5

67

U1

+5VC1

R2

R4

R6 R7R1

R3

C2

C4

C5

+5V

Cbp

4-pole, low pass filterUsing two 2-pole Sallen-Key Low Pass Filters

FILTERIN

FILTEROUT

1

2

3

4

5

6

7

8

J1

8PIN

FILTEROUT

FILTERINGND

+5V



NOTES:


Filter Board Schematics and Board Layouts

NOTES:



NOTES:


Filter Board Schematics and Board Layouts

NOTES:


2002 Microchip Technology Inc.

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MCP3201/02 and MCP3204/08 ADC Daughter Board User's …ww1.microchip.com/downloads/en/DeviceDoc/51220a.pdfMCP3202 Analog to Digital Converters. • Display data from conversions on