AD8180/AD8182

–11–

REV. B

C1

ANALOG

DEVICES

AD8180/82

EVALUATION

BOARD

J1

IN0A

J10

SEL A

J2

IN1A

J3

IN1B

IN0B

J4

J9

J8

EN A

R10

R1

U1

R2

R3

SEL B

J5

J6

EN B

A

B

C2

R5

R9

R8

R4

Figure 28. Component Side Silkscreen

Figure 29. Board Layout (Component Side)

C3

C4

R6

Figure 30. Solder Side Silkscreen

Figure 31. Board Layout (Solder Side)

NOTES

1. AD8180R/AD8182R Evaluation Board inputs are configured

with 50

Ω impedance striplines. This FR4 board type has the

following stripline dimensions: 60-mil width, 12-mil gap

between center conductor and outside ground plane “is-

lands,” and 62-mil board thickness.

2. Several types of SMA connectors can be mounted on this

board: the side-mount type, which can be easily installed at

the edges of the board, and the top-mount type, which is

placed on top. When using the top-mount SMA connector, it

is recommended that the stripline on the outside 1/8" of the

board edge be removed with an X-Acto blade as this unused

stripline acts as an open stub, which could degrade the small-

signal frequency response of the mux.

3. Input termination resistor placement on the evaluation board

is critical to reducing crosstalk. Each termination resistor is

oriented so that ground return currents flow counterclock-

wise to a ground plane “island.” Although the direction of

this ground current flow is arbitrary, it is important that no

two input or output termination resistors share a connection

to the same ground “island.”