ADG904/ADG904-R

Data Sheet

Rev. C | Page 12 of 16

EVALUATION BOARD

The ADG904/ADG904-R evaluation board allows designers

to evaluate the high performance, wideband switches with

minimal effort.

Only a power supply and a network analyzer, along with the

evaluation board, are required to demonstrate that these devices

meet user requirements. An application note, available with the

evaluation board, provides complete operating information.

The RFC port (see Figure 30) is connected through a 50 Ω

transmission line to the bottom left SMA connector, J4. RF1,

RF2, RF3, and RF4 are connected through 50 Ω transmission

lines to SMA connectors J5, J6, J7, and J8, respectively. A through

transmission line connects J9 and J10; this transmission line

is used to estimate the loss of the PCB over the environmental

conditions being evaluated.

The board is constructed of four-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 were designed

using a coplanar waveguide with a ground plane model using

a trace width of 0.024 inches, clearance to ground plane of

0.008 inches, dielectric thickness of 0.02 inches, and a metal

thickness of 0.0021 inches.

Figure 30. ADG904/ADG904-R Evaluation Board Top View