adg918 Analog Devices, Inc., adg918 Datasheet - Page 13

• Manufacturer Part Number: adg918
• Description: Wideband, 43db Isolation 1ghz, Cmos 1.65 V To 2.75v, 2 1 Mux/spdt Switches
• Manufacturer: Analog Devices, Inc.

ADG918/ADG919
ADG9XX EVALUATION BOARD
The ADG9xx evaluation board allows designers to evaluate the
high performance wideband switches with a minimum of effort.
To prove that these devices meet the user’s requirements, the
user only requires a power supply and a network analyzer along
with the evaluation board. An application note is available with
the evaluation board and gives complete information on
operating the evaluation board.
The RFC port (see Figure 29) is connected through a 50 Ω
 t ransmission line to the top left SMA connector J1. RF1 and
RF2 are connected through 50 Ω transmission lines to the top
two SMA connectors J2 and J3, respectively. A through
transmission line connects J4 and J5 and this transmission line
is used to estimate the loss of the PCB over the environmental
conditions being evaluated.
The board is constructed of a 4-layer, FR4 material with a
dielectric constant of 4.3 and an overall thickness of 0.062
inches. Two ground layers with grounded planes provide
ground for the RF transmission lines. The transmission lines
Figure 29. ADG9xx Evaluation Board Top View
were designed using a coplanar waveguide with ground plane
model using a trace width of 0.052 inches, clearance to ground
plane of 0.030 inches, dielectric thickness of 0.029 inches, and a
metal thickness of 0.014 inches.
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