AD8180/AD8182
J1
IN0A
ANALOG
DEVICES
AD8180/82
J10 J9
EVALUATION SEL A
BOARD
EN A
R1
U1
R9
R8
J8
R7
J2
IN1A
A
R10
C1
V+
V–
C2
R2
J3
IN1B
R3
R4
R5
J7
B
R6
C3
C4
IN0B
J4
SEL B
J5
EN B
J6
Figure 28. Component Side Silkscreen
Figure 30. Solder Side Silkscreen
Figure 29. Board Layout (Component Side)
NOTES
Figure 31. Board Layout (Solder Side)
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.”
REV. B
–11–
AD [ ANALOG DEVICES ]
