AD8111AST datasheet(25/29 Pages) AD

25 / 29 page

REV. A

AD8110/AD8111

–24–

The three power supply pins AVCC, DVCC, and AVEE should

be connected to good quality, low noise,

±5 V supplies. Where

the same

±5 V power supplies are used for analog and digital,

separate cables should be run for the power supply to the evalu-

ation board’s analog and digital power supply pins.

As a general rule, each power supply pin (or group of adjacent

power supply pins) should be locally decoupled with a 0.01

µF

capacitor. If there is a space constraint, it is more important to

decouple analog power supply pins before digital power supply

pins. A 0.1

µF capacitor, located reasonably close to the pins,

can be used to decouple a number of power supply pins. Finally

a 10

µF capacitor should be used to decouple power supplies as

they come on to the board.

Controlling the Evaluation Board from a PC

The evaluation board includes Windows-based control software

and a custom cable that connects the board’s digital interface to

the printer port of the PC. The wiring of this cable is shown in

Figure 15. The software requires Windows 3.1 or later to oper-

ate. To install the software, insert the disk labeled “Disk #1 of

2'' in the PC and run the file called SETUP.EXE. Additional

installation instructions will be given on-screen. Before begin-

ning installation, it is important to terminate any other Windows

applications that are running.

When you launch the crosspoint control software, you will be

asked to select the printer port you are using. Most modern PCs

have only one printer port, usually called LPT1. However some

laptop computers use the PRN port.

RESET

CLK

DATA IN

DGND

UPDATE

MOLEX 0.100" CENTER

CRIMP TERMINAL HOUSING

D-SUB 25 PIN (MALE)

14 1

EVALUATION BOARD

SIGNAL

RESET

UPDATE

DATA IN

CLK

DGND

MOLEX

TERMINAL HOUSING

D-SUB-25

Figure 15. Evaluation Board-PC Connection Cable

Figure 14. Board Layout (Bottom Layer)

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