sky65081-70lf Skyworks Solutions, Inc., sky65081-70lf Datasheet - Page 5

• Manufacturer Part Number: sky65081-70lf
• Description: Sky65081-70lf 2000-3000 Mhz Low-noise Power Amplifier Driver
• Manufacturer: Skyworks Solutions, Inc.

Evaluation Board Description
The Skyworks SKY65081-70LF Evaluation Board is used to test
the performance of the SKY65081-70LF PA driver. An assembly
drawing for the Evaluation Board is shown in Figure 13 and the
layer detail is provided in Figure 14.
Capacitors C7, C8, and C9 provide DC bias decoupling for VCC.
Pins 1 and 3 are the RF input and output signals, respectively.
External DC blocking is required on the input and output, but can
be implemented as part of the RF matching circuit. Pin 2 and the
package backside metal, pin 4, are ground pins that provide the
DC and RF ground, respectively.
Circuit Design Configurations
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 SKY65081-70LF power amplifier has
NOTE: Junction temperature (Tj) of the device increases with a
A suggested matching circuit is shown in Figure 15 with
component values for the SKY65081-70LF-11 package option
listed in Table 5. Component values for the SKY65081-70LF-21
package option are shown in Table 6.
Testing Procedure
Use the following procedure to set up the SKY65081-70LF
Evaluation Board for testing:
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 possible 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.
70
60
50
40
30
20
10
0
0
Figure 11. PAE vs Output Power Over Voltage
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
+5
201192B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 24, 2010
+10
P
OUT
+15
(dBm)
+20
+25
4.8 V
5.0 V
5.2 V
+30
1. Connect a 5.0 V supply to VCC. If available, enable the current
2. Connect a signal generator to the RF signal input port. Set it to
3. Connect a spectrum analyzer to the RF signal output port.
4. Enable the power supply.
5. Enable the RF signal.
6. Take measurements.
Package and Handling Information
Since the device package is sensitive to moisture absorption, it is
baked and vacuum packed before shipping. Instructions on the
shipping container label regarding exposure to moisture after the
container seal is broken must be followed. Otherwise, problems
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The SKY65081-70LF is rated to Moisture Sensitivity Level 1
(MSL1) at 260 C. It can be used for lead or lead-free soldering.
Care must be taken when attaching this product, whether it is
done manually or in a production solder reflow environment.
Production quantities of this product are shipped in a standard
tape and reel format. For packaging details, refer to the Skyworks
Application Note Tape and Reel, document number 101568.
Package Dimensions
Package dimensions for the 4-pin SOT-89 are shown in
Figure 16, and tape and reel dimensions are provided in
Figure 17.
CAUTION: If any of the output signals exceed the rated
limiting function of the power supply to 100 mA.
the desired RF frequency at a power level of –15 dBm or less
to the Evaluation Board but do NOT enable the RF signal.
110
100
90
80
70
60
50
40
–10
Figure 12. Current vs Output Power Over Voltage
maximum values, the SKY65081-70LF Evaluation
Board can be permanently damaged.
0
DATA SHEET • SKY65081-70LF PA DRIVER
P
OUT
+10
(dBm)
+20
4.8 V
5.0 V
5.2 V
+30
5