EVAL-ADG904/ADG904-R

Rev. A | Page 3 of 8

ADG904/ADG904-R

The ADG904/ADG904-R evaluation board allows designers to

evaluate the high performance, wideband switches with

minimum effort. To test these devices to ensure that they meet

the user’s requirements, the user needs only a power supply and

a network analyzer to use this evaluation board.

The RFC port 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 the SMA connectors

(J5, J6, J7, and J8, respectively). A through transmission line

connects J9 and J10, and this transmission line is used to estimate

the loss of the PCB over the environmental conditions being

evaluated (see Figure 2).

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 design of the transmission lines

incorporates a coplanar wave guide with a ground plane model

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

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

thickness of 0.0021 inches.

Two 10 μF surface-mount, tantalum decoupling capacitors are

provided on the VDD line, one placed close to the DUT along

with a 100 pF ceramic capacitor on the VDD line.

EVAL-ADG904-R/ADG904

C1

VDD

GND

J12

1

J3

K1

HL

EN

J1

K3

HL

A0

J2

K2

HL

A1

RF1

RF3

RFC

J5

J7

J4

RF2

RF4

CAL

CAL

J6

J8

J10

J9

U1

C2 C3

Figure 2. ADG904/ADG904-R Evaluation Board (Top View)