SP42450

SP42450

High-Isolation RF Switch

Tel: +86-23-62808818

Fax: +86-23-62805284

www.sipatsaw.com / sawmkt@sipat.com Page 4 of 10

Evaluation Kit

The SP5T switch EK Board was designed to ease customer

evaluation of SP42450. The RF common port is connected

through a 50 Ω transmission line via the top SMA connector.

RF1, RF2, RF3 and RF4 are connected through 50 Ω

transmission lines via side SMA connectors. A through 50 Ω

transmission is available via SMA connectors RFCAL1 and

RFCAL2. This transmission line can be used to estimate the

loss of the PCB over the environmental conditions being

evaluated.

The EVK board is constructed with four metal layers on

dielectric materials of Rogers 4003C and 4450 with a total

thickness of 32 mils. Layer 1 and layer 3 provide ground for

the 50 ohm transmission lines. The 50 ohm transmission

lines are designed in layer 2 for high isolation purpose and

use a stripline waveguide design with a trace width of 9.4

mils and trace metal thickness of 1.8 mils. The board stack

up for 50 ohm transmission lines has 8 mil thickness of

Rogers 4003C between layer 1 and layer 2, and 10 mil

thickness of Rogers 4450 between layer 2 and layer 3. Please

consult manufacturer's guidelines for proper board material

properties in your application. The PCB should be designed

in such a way that RF transmission lines and sensitive DC i/o

otherwise the true performance of the SP42450 will not be

yielded.

Figure 4. Evaluation Board Layouts

Figure 5. Evaluation Board Schematic

RF CAL

USE PCB 101-0479-03

STRIPLINE

1

1

3

3

5

5

7

7

2

2

4

4

6

6

8

8

10

10

12

12

14

14

13

13

9

9

11

11

J1

HEADER 14

1

RFCAL1

2

RFC

1

RFCAL2

1

RF1

R2

1M

1

RF4

1

RF5

C6

1µF

1

GND

2

RF5

3

GND

4

GND

5

RF4

6

GND

13

GND

14

RF1

15

GND

16

VDD

17

V1

18

V2

U1

PE4245x_24L_QFN

1

RF3

1

RF2

C1

DNI

R1

0OHM

R3

0OHM

C2

100pF

R4

1M

R5

0OHM

C3

100pF

R6

1M

R7

0OHM

C4

100pF

R8

1M

R9

0OHM

C5

100pF

RF

RF5

RF4

RF1

RF2

RF3

V1

V2

V3

VDD

VSS