Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

July 31, 2006 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200445 Rev. B

DATA SHEET • SKY65028-70LF

6

Evaluation Board Description

The Skyworks SKY65028-70LF Evaluation Board is used to test

the performance of the SKY65028-70LF power amplifier driver.

The following design considerations are general in nature and

must be followed regardless of final use or configuration.

1. Paths to ground should be made as short as possible.

2. The ground pad of the SKY65028-70LF power amplifier has

special electrical and thermal grounding requirements. This pad

is the main thermal conduit for heat dissipation. Since the circuit

board acts as the heat sink, it must shunt as much heat as pos-

sible from the amplifier. As such, design the connection to the

ground pad to dissipate the maximum wattage produced to the

circuit board. Multiple vias to the grounding layer are required.

poor connection to the slug and ground. This reduces the

lifetime of the device.

Testing Procedure

Use the following procedure to set up the SKY65028-70LF

Evaluation Board for testing:

limiting function of the power supply to 240 mA.

2. Connect a signal generator to the RF signal input port. Set it to

the desired RF frequency at a power level of -15 dBm or less

to the evaluation board but do NOT enable the RF signal.

3. Connect a spectrum analyzer to the RF signal output port.

4. Enable the power supply.

5. Enable the RF signal.

6. Take measurements.

CAUTION: If any of the output signals exceed the rated maximum

values, the SKY65028-70LF evaluation board can be

permanently damaged.

R3

R2

R1

C7

C1 C2

C3

C8

C9

C5

C6

C4

L2

L1

JP1

Evaluation Board Assembly

Layer 3: Ground

Layer 4: Solid Ground Plane

Layer 1: Top - Metal

Layer 2: Ground

Evaluation Board Layer Detail