DATA SHEET • SKY65338-21 TRANSMIT/RECEIVE FRONT-END MODULE
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
6 October 13, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201004C
Table 5. SKY65338-21 SPDT Switch Control Logic
Mode V1 Signal (Pin 9) V2 Signal (Pin 8)
Transmit 1 0
Receive 0 1
Note: Logic level 0: 0 V to 0.2 V
Logic level 1: 2.0 V to 5.0 V
Evaluation Board Description
The SKY65338-21 Evaluation Board is used to test the
performance of the SKY65338-21 FEM. The Evaluation Board
schematic diagram is shown in Figure 11. An assembly drawing
for the Evaluation Board is shown in Figure 12 and the layer detail
is provided in Figure 13. The layer detail physical characteristics
are noted in Figure 14. Table 6 provides the Bill of Materials
(BOM) list for Evaluation Board components.
Circuit Design Considerations
The following design considerations are general in nature and
must be followed regadless of final use or configuration:
1. Paths to ground should be made as short as possible.
2. The ground pad of the SKY65338-21 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 possible
from the device. Therefore, design the connection to the
ground pad to dissipate the maximum wattage produced by
the circuit board. Multiple vias to the grounding layer are
required.
NOTE: A poor connection between the slug and ground increases
junction temperature (T
J), which reduces the lifetime of the
device.
Package Dimensions
The phone board layout footprint for the SKY65338-21 is shown
in Figure 15. Package dimensions for the 12-pin MCM are shown
in Figure 16, and tape and reel dimensions are provided in
Figure 17.
SKY65338
S1348
J4
SMA
J2
SMA
J3
SMA
Voltage Bias
DC Supply 1
PA Enable
DC Supply 2
Switch Logic (V1)
Switch Logic (V2)
Voltage Reference 2
Voltage Reference 1
1
123456789
2
3
456
12 11 10
9
8
7
TX_IN
GND
RX_OUT
VC_BIAS
VREF1
VREF2
VCC1
PA_EN
VCC2
V2
Switch Logic
Voltage Bias
Voltage Reference 2
Voltage Reference 1
DC Supply 1
DC Supply 2
PA Enable
9-Header
V1
ANT
Switch Logic
50 Ω Transmission
Line
50 Ω Transmission
Line
50 Ω Transmission
Line
Figure 11. SKY65338-21 Evaluation Board Schematic