AD8111AST datasheet(25/28 Pages) AD

25 / 28 page

AD8110/AD8111

–25–

REV. 0

w = 0.008"

(0.2mm)

a = 0.008"

(0.2mm)

b = 0.024"

(0.6mm)

h = 0.011325"

(0.288mm)

t = 0.00135" (0.0343mm)

TOP LAYER

SIGNAL LAYER

POWER LAYER

BOTTOM LAYER

Figure 50. Cross Section of Input and Output Traces

The board has 24 BNC type connectors: 16 inputs and 8 out-

puts. The connectors are arranged in a crescent around the

device. As can be seen from Figure 47, this results in all 16

input signal traces and all eight signal output traces having the

same length. This is useful in tests such as All-Hostile Crosstalk

where the phase relationship and delay between signals needs to

be maintained from input to output.

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 adja-

cent 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 rea-

sonably 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 include Windows-based control soft-

ware 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 51. The software requires Win-

dows 3.1 or later to operate. 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 beginning 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)

EVALUATION BOARD

SIGNAL

RESET

UPDATE

DATA IN

CLK

DGND

MOLEX

TERMINAL HOUSING

D-SUB-25

Figure 51. Evaluation Board-PC Connection Cable

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