Analog Devices AN627 Application Notes

AN-627

APPLICATION NOTE

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel: [phone] • Fax: [phone] • www.analog.com

AD5235 Evaluation Kit User Manual

by Alan Li

7 STEPS TO EVALUATION KIT SETUP

The AD5235 evaluation kit (AD5235EVAL25) consists of
a demonstration board and software for evaluating the
AD5235. It is a user-friendly tool that you can control

1.

INSTALL THE AD5235 SOFTWARE

2. INSTALL THE DRIVER

3. CONNECT THE PARALLEL
PORT CABLE

4. CONFIGURE THE
EVALUATION BOARD

with your personal computer through the printer port.
The driving program is self-contained, so no program­ming languages or skills are needed. Figure 1 provides
an overview of how to set up the kit.

H

AD5235

6. OPEN THE AD5235 SOFTWARE AND
PROGRAM THE RESISTANCE SETTINGS

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+5V

5. APPLY THE POWER SUPPLY

GND

Figure 1. Evaluation Kit Setup

W1

B1

7. MEASURE THE RESULT

AN-627

SETTING UP THE AD5235 EVALUATION BOARD

Step 1—Installing the AD5235 Software

To install the AD5235 software from the Revision H CD,
run setup.exe under D:\AD5235 Evaluation Software
Package. During the installation, select Ignore or Yes
to bypass error messages if they occur. You may need
to install the software a few times to get a successful
installation.

Step 2—Installing the Driver for PC Parallel Port Communications

In addition to installing the AD5235 software, you need
to install a third-party driver, NTPORT from Upper
Canada Technologies (UCT), for access to the PC parallel
port. UCT offers a free trial with a nominal license fee
after 30 days.

1. Download the driver from www.uct.on.ca. From the
UCT website, download NTPORT.OCX. Save
ntport.zip in the default or specified directory. Unzip
and extract all the files to the directory.

2. Run setup.exe. If the setup procedure indicates
file violations during installation, select Ignore to
bypass them.

3. Ensure that the driver file, dlportio.sys, is in the
correct system directory.

Note: If Windows® displays an error message, such as
“Can’t connect to service control manager,” contact the
IS department for authority to continue installation.

b.Change the pathname of the driver according to

the operating system.

• On a Windows 2000 or Window NT

enter c:\winnt\system32\drivers\dlportio.sys.

®

system,

• On a Windows XP system, enter

c:\windows\system32\drivers\dlportio.sys.

c. Click the Install button, then the Start button. If

the status message indicates success, the driver is
installed and operating. Click OK.

4. Set up the driver for automatic startup. Use the
following steps that apply to your operating system.

For Windows 2000 and XP Systems

a. Go to the Device Manager.

• On a Windows 2000 system, click

Start → Settings → Control Panel → System →
Hardware → Device Manager.

• On a Windows XP system, click

Start → Control Panel → System → Hardware →
Device Manager.

a. Run loaddrv.exe under c:\program files\project1

or the specified directory. A dialog box appears.

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AN-627

b.Locate Non-Plug and Play Drivers and dlportio

in the Device Manager.

If the Non-Plug and Play Drivers entry is not vis­ible, click the View menu in Device Manager and

select show Hidden Devices to make sure that
hidden driver files are listed. If you do not see
dlportio, reboot Windows or rerun loaddrv.exe and
then reboot Windows.

c. Double-click dlportio in the Non-Plug and Play

Drivers list. The dlportio Properties page appears.

d.At the Driver tab, select Startup Type as Auto-

matic, click Current status to Start, and click OK.

Note: If Startup is not active and you cannot change Type,

your computer may be administered by your IS depart­ment. You may need to consult them to change your PC
administrative setting.

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For Windows NT Systems

a. From the Windows NT Control Panel, select the

Devices icon. The Devices dialog box appears.

b.Select dlportio and click the Startup button. The

Device Startup Type dialog box appears. From the
option buttons, select Automatic, and then click OK.

• For dual supplies, connect JP15 and JP12 to connect

the –5 V pin to V

of U1 and U3.

SS

Warning: Apply +2.5 V to Pin +5 V and –2.5 V to
Pin –5 V instead.

• Select the states of PR and WP from the DIP switches

on the evaluation board.

• SDO can be monitored at TPSDO.

Step 5—Applying the Power Supply

Provide a power supply to the AD5235 evaluation
board according to Step 4 for a single supply or for
dual supplies.

Step 6—Using the Evaluation Board

To open the AD5235 software program, from Windows
click Start → Programs → AD5235 Rev H.

Figure 2 shows the graphical interface. In the Direct Con­trol pane, on the right, you can move the scroll bars or
click the buttons to control the device. In the top pane,
you can adjust the bit pattern and then click Run to pro­gram the device. In the bottom pane, you can
approximate R
R

after power is applied.

AB

and RWB by first entering the measured

WA

Step 7—Measuring the Result

Use a multimeter to measure the result of your program
applications on the AD5235 evaluation board.

Step 3—Connecting the Parallel Port Cable

Connect the parallel port cable from LPT1 on your PC to
the AD5235 evaluation board.

Step 4—Configuring the Evaluation Board

Follow these requirements to configure the AD5235
evaluation board:

• For a single supply, connect JP14 and JP13 to

ground V

of U1 and U3. Apply 5 V to Pin +5 V.

SS

Note: Some boards do not come with jumper
caps. You should supply suitable caps or simply
short the jumpers for proper operation.

UNINSTALLING SOFTWARE

To uninstall the AD5235 software and NTPORT driver,
use Add/Remove Programs in the Control Panel.

TECHNICAL SUPPORT

Due to the variations in computer platforms and con­figurations, Analog Devices, Inc., cannot guarantee the
software described in this application note to work on all
systems. If you encounter problems, send email to
[e-mail] or call 1-408-382-3082 for
applications support. If you are interested in the AD5235
source code, send email to [e-mail] for more
information.

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Figure 2. AD5235 Software Graphical Interface

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EVALUATION BOARD SCHEMATIC

The general-purpose op amp AD820, U3A can be configured
as various building block circuits in conjunction with the
AD5235 for various circuit evaluations (see the Applications

AD5235 MAIN CIRCUIT

J1

DB25

NOTES
USERS SHOULD IGNORE U1A, ADN2850CSP
SIGNAL GROUND WITH NET DGND
POWER GROUND WITH NET AGND

DGND

13
25
12
24
11
23
10
22

9

21

8

20

7

19

6

18

5

17

R_CS 100

4

16

R_CLK 100

3

15

R_SDI 100

2

14

1

TP/CS

TPCLK

TPSDI

ADN2850CSP

TPSDO

+5V

HEADER

HEADER

U1A

SDI16CLK15RDY14CS

1

SDO

2

GND

3

VSS

4

A1

R1
1k

1

2

3

4

5

6

7

8

JP14

JP15

(LOWER TO –2.5V IF DUAL SUPPLIES)

W15B16B2

SDI
SDO
GND
V
A1
W1

CLK

SS

7

RDY

CS
PR

WP

V

W2

B1

U1B

AD5235TSSOP

C12

C13

0.1F

4.7F

section). Other op amps in PDIP can replace the AD820. For a
single-supply, 2.5 V voltage reference, AD1582 can be
used to offset the op amp bias point for ac operation.

+5V

+5V

13

PR

WP

VDD

A2

W2

8

16

15

14

13

12

DD

11

A2

10

9

B2

–5V

(LOWER TO +2.5V IF DUAL SUPPLIES)

R2

R3

10k

10kR410k

12

11

10

9

GND

–5V

C10

4.7F

C11

0.1F

TP/WPTP/PRTPRDY

HIGH LOW

18

27

36

45

A1

W1

B1

A2

W2

B2

S1

SW-DIP4

VI_DC

V

_AC

I

0.1F

C7

ADDITIONAL OP AMP FOR GENERAL-PURPOSE APPLICATIONS

V+ V– V

+5V

3

AD1582

V

IN

HEADER

U2

GND

V

OUT

JP5

C9

HEADER

HEADER

2

1

2.5 VREF

JP4

JP3

JP7

JP6 JP8

JP2

HEADER

C8

0.1F

2

AD820AR

3

JP1

JP9

U3A

4

–5V

+5

7

C5

0.1F

1, 5, 8

JP12
HEADER

C6

0.1F

6

Figure 3. Evaluation Board Schematic

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O

JP10 JP11

JP13
HEADER

2

AD820AN

3

1

+5V

7

U3B

REPLACEABLE

4

OP AMP IN PDIP

V

O

8

6

5

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