Product Specification

SP4272

Page 4 of 10

Evaluation Kit

The SPDT Switch Evaluation Kit board was

designed to ease customer evaluation of the

SP4272 SPDT switch. The RF common port is

connected through a 75

Ω transmission line to the

bottom F connector, J2. Port 1 and Port 2 are

connected through 75

Ω transmission lines to two F

connectors on either side of the board, J1 and J3. A

through transmission line connects F connectors J4

and J5. This transmission line can be used to

estimate the loss of the PCB over the environmental

conditions being evaluated.

The board is constructed of a two metal layer FR4

material with a total thickness of 0.031”. The bottom

layer provides ground for the RF transmission lines.

The transmission lines were designed using a

coplanar waveguide with ground plane model using

a trace width of 0.021”, trace gaps of 0.030”,

dielectric thickness of 0.028”, copper thickness of

0.0021” and

ε

J6 provides a means for controlling the DC inputs to

the device. The lower right pin (J6-2) is connected

to the device CTRL input. The upper right pin (J6-1)

decoupling capacitors are provided on both CTRL

customer to determine proper supply decoupling for

their design application. Removing these

components from the evaluation board has not been

shown to degrade RF performance.

Figure 4. Evaluation Board Layouts

Figure 5. Evaluation Board Schematic

DD

Tel: +86-23-62808818

Fax: +86-23-62805284

www.sipatsaw.com / sawmkt@sipat.com