ADG904/ADG904-R

Rev. 0 | Page 12 of 16

EVALUATION BOARD

The ADG904/ADG904-R evaluation board allows designers to

evaluate the high performance, wideband switches with

minimal effort.

To prove that these devices meet the user’s requirements, only a

power supply and a network analyzer, along with the evaluation

board, are required. An application note available with the

evaluation board gives complete information on operating the

evaluation board.

The RFC port (see Figure 29) 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 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

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 29. ADG904/ADG904-R Evaluation Board Top View