Recommended System Requirements - Analog Devices ADN8810 Application Note

AN-619
ADJUSTING MAXIMUM OUTPUT CURRENT
The full-scale output current from the ADN8810 is set by
two external resistors of equal value, RS1 and RS2:
≈
I
FS
where R is equal to RS1 and to RS2. These are 1.6  1%
S
surface-mount resistors on the demo board, setting the
full-scale output current to approximately 256 mA.
To change the full-scale output current, remove RS1 and
RS2 and insert new resistors according to Equation 1.
Holes are provided on the demo board for these sense
resistors. Resistor matching of 1% or better is recom-
mended to ensure high output impedance for the current
source.
The output current from the ADN8810 is proportional to
the 12-bit code sent to the device.
4.096
= Code ×
I
OUT
4096
The decimal code value range is 0 to 4,095. The demo
board software automatically calculates the output current.
CONNECTING DEMO BOARDS TO THE COMPUTER
Connect the parallel port of the computer to the INPUT
jack on the ADN8810 demo board with a DB-25 straight-
through male-to-female cable. Do not use a printer or
null-modem cable as these cross wires and will not
control the board.The OUTPUT jack does not require any
connection.
Multiple ADN8810 demo boards can be daisy-chained
together, allowing control from a single computer. Con-
nect the output jack from one board to the input jack of
another board using a DB-25 straight-through male-to-
female cable. Alternatively, the boards can be plugged
together directly with no cable. Supply voltages must be
connected to each demo board.
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Figure 1. Connecting Multiple ADN8810 Demo Boards
4.096
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S
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DEMO SOFTWARE INSTALLATION AND
UNINSTALLATION PROCEDURES
To run the ADN8810EVB Controller installation script:
1. Insert the CD into the CD-ROM drive.
(1)
2. Double-click the My Computer icon on your Windows
desktop.
3. Navigate to the CD-ROM drive and double-click
Setup.exe to launch the installation wizard.
4. Follow the directions in the wizard to complete the
installation process.
To uninstall the ADN8810EVB Controller, do the following:
1. Select Control Panel from Settings under the Windows
Start menu.
2. When the Control Panel opens, double-click the Add/
Remove Programs icon.
(2)
3. From the Add/Remove Programs dialog, select
ADN8810EVB Controller.
4. Click Remove.
5. Follow the directions in the wizard for uninstallation.

RECOMMENDED SYSTEM REQUIREMENTS

To install the ADN8810EVB Controller, the computer must
meet the following minimum system requirements:
• Windows 95, Windows 98, Windows ME, Windows
NT 4.0 (Intel
installed, Windows 2000 (administrative privileges
required), or Windows XP
®
• Pentium -class PC (200 MHz or higher recommended)
• 128 megabytes (MB) of RAM
GETTING STARTED
The ADN8810EVB Controller installation wizard places a
shortcut on the Windows desktop and under the Program
Files folder of the Start menu to launch the application.
Using either of these shortcuts will launch theADN8810EVB
Controller.
The main interface window of the ADN8810EVB Controller
is shown in Figure 2. There are four sections that a user
must become acquainted with in order to properly use
the ADN8810EVB Controller and evaluate the capabilities
of the ADN8810 device: 1) Mode Settings, 2) Device Selec-
tion, 3) Output Current Selection, and 4) Control Buttons.
–2–
®
) operating system with Service Pack 4
®
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