AD8170/AD8174

–14–

REV. 0

NOTES

1. AD8170R/AD8174R 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.”