PRELIMINARY DATA SHEET
SKY65338: 450-470 MHz Transmit/Receive Front-End Module
Applications
•
Tetra radio
•
Remote metering
•
GSM
•
WLL transmitters
Description
Skyworks SKY65338 is a high-efficiency Front-End Module (FEM)
that incorporates a transmit and receive path, and an antenna
transmit/receive (T/R) switch.
The transmit path consists of a high efficiency Power Amplifier
(PA) followed by an harmonic filter for rejection of harmonic
frequencies.
The PA is implemented using Skyworks high reliability
Heterojunction Bipolar Transistor (HBT) process and is Class AB
biased to provide maximum efficiency with a low spurious output.
A high linearity and high isolation Single-Pole Double-Throw
(SPDT) switch is used at the common antenna interface between
the transmit and receive paths. The receive path is a low insertion
loss through-path with input and output ports internally matched
to 50
Ω.
The device is mounted in a 12-pin, 8 x 8 mm Multi-Chip Module
(MCM) Surface-Mounted Technology (SMT) package, which
allows for a highly manufacturable low-cost solution.
A block diagram of the SKY65338 is shown in Figure 1. The
device package and pinout for the 12-pin MCM are shown in
Figure 2.
Features
•
Transmit output power > +25 dBm
•
High gain in transmit path: 32 dB
•
High transmit/receive isolation > 30 dB
•
Internal RF match and bias circuits
•
All RF ports internally DC blocked
•
Single DC supply = +3.6 V
•
Small footprint, MCM (12-pin, 8 x 8 mm) Pb-free (MSL3, 260
°C
per JEDEC J-STD-020) SMT package
Skyworks offers lead (Pb)-free RoHS (Restriction of
Hazardous Substances) compliant packaging.
Transmit
Port
SPDT
Switch
PA
Harmonic
Filter
Antenna
Port
Receive
Port
S1346
Figure 1. SKY65338 Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201004B • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 1, 2009
1
PRELIMINARY DATA SHEET • SKY65338 TRANSMIT/RECEIVE FRONT-END MODULE
PA_EN
11
VCC1
12
10
TX_IN
GND
RX_OUT
VCC2
1
9
V1
V2
ANT
2
8
3
7
4
5
6
VC_BIAS
VREF1
VREF2
S1347
Figure 2. SKY65338 Pinout – 12-Pin MCM
(Top View)
Table 1. SKY65338 SPDT Switch Control Logic
Mode
Transmit
Receive
Note:
Logic level 0: 0 V to 0.2 V
Logic level 1: 2.0 V to 5.0 V
V1 Signal (Pin 9)
1
0
V2 Signal (Pin 8)
0
1
Technical Description
The SKY65338 provides input and output amplifier stages, and is
internally matched for optimum efficiency. An active bias circuit
provides the input and output stages with excellent gain tracking
over temperature and voltage variations. The module operates
with positive DC voltages, and maintains high efficiency and good
linearity. The nominal operating voltage is 3.6 V for maximum
power, but the device can be operated at slightly lower voltages
for other mobile applications.
The SKY65338 is internally matched for optimum linearity and
efficiency. The input and output stages are independently
supplied using the VCC1 and VCC2 supply lines (pins 12 and 10,
respectively). The bias reference voltages for stages 1 and 2 are
supplied using common lines VREF1 and VREF2 (pins 5 and 6,
respectively). The DC control voltage that sets the bias for
stages 1 and 2 is supplied by the VC_BIAS signal, pin 4.
Operational Modes
The module’s receive and transmit modes are configured using
the V1 and V2 control signals (pins 9 and 8, respectively). The
transmit path provides an harmonic filter and high efficiency PA.
The receive path provides a low loss <1 dB bypass between the
antenna port and the receive port.
Table 1 provides the SPDT transmit/receive switch control logic.
Electrical and Mechanical Specifications
Signal pin assignments and functional pin descriptions are
described in Table 2. The absolute maximum ratings of the
SKY65338 are provided in Table 3. The recommended operating
conditions are specified in Table 4 and electrical specifications
are provided in Table 5.
Typical performance characteristics of the SKY65338 are
illustrated in Figures 3, 4, and 5.
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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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May 1, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201004B
PRELIMINARY DATA SHEET • SKY65338 TRANSMIT/RECEIVE FRONT-END MODULE
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The SKY65338 is rated to Moisture Sensitivity Level 3 (MSL3) at
260
°C.
It can be used for lead or lead-free soldering. For
additional information, refer to Skyworks Application Note,
PCB
Design and SMT Assembly/Rework Guidelines for MCM-L
Packages,
document number 101752.
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.
Table 2. SKY65338 Signal Descriptions
Pin #
1
2
3
4
5
6
TX_IN
GND
RX_OUT
VC_BIAS
VREF1
VREF2
Name
Description
Transmit RF input
Ground
Receive RF output
+3.6 V DC supply
+3.6 V DC supply
+3.6 V DC supply
Pin #
7
8
9
10
11
12
ANT
V2
V1
VCC2
PA_EN
VCC1
Name
Antenna
Switch logic (see Table 1)
Switch logic (see Table 1)
+3.6 V DC supply
PA enable switch
(On = 2.5-3.6 V; Off = 0-0.2 V)
+3.6 V DC supply
Description
Table 3. SKY65338 Absolute Maximum Ratings (Note 1)
Parameter
Supply voltage
Input power
Supply current
Case operating temperature
Storage temperature
Junction temperature
VCC
P
IN
I
CC
T
C
T
ST
T
J
–40
–65
Symbol
Minimum
Maximum
4.4
+5
800
+85
+125
150
Units
V
dBm
mA
°C
°C
°C
Note 1:
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value.
Table 4. SKY65338 Recommended Operating Conditions
Parameter
Supply voltage
Case operating temperature
Storage temperature
Symbol
VCC1, VCC2, VREF1,
VREF2, VC_BIAS
T
C
T
ST
Minimum
3.0
–40
–55
Typical
3.6
Maximum
4.0
+85
+125
Units
V
°C
°C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201004B • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 1, 2009
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PRELIMINARY DATA SHEET • SKY65338 TRANSMIT/RECEIVE FRONT-END MODULE
Table 5. SKY65338 Electrical Specifications
(Frequency = 460 MHz, VCC1 = VCC2 = VREF1 = VREF2 = VC_BIAS = 3.6 V, T
C
= +25
°C,
Unless Otherwise Noted)
Parameter
Operating frequency range
Transmit path small signal gain
Transmit saturated output power
Transmit path Noise Figure
Transmit path harmonics (2
nd
to 10
th
)
Power Added Efficiency
Receive path insertion loss
Transmit/receive path isolation
Input return loss
Output return loss
f
G
P
SAT
NF
Pf2 to Pf10
PAE
R
X
_
LOSS
I
SOL
S11
S22
CW
27
15
9
CW, P
OUT
= +25 dBm
CW, P
OUT
= +27 dBm
55
30
CW, P
IN
= –30 dBm
CW, P
IN
= –4 dBm
Symbol
Test Condition
Min
450
30
+25
32
+27
5.5
59
36
0.8
30
17
12
1.0
6.5
Typical
Max
470
Units
MHz
dB
dBm
dB
dBc
%
dB
dB
dB
dB
Quiescent current
Operating current
Leakage current
Maximum VSWR for stable operation
I
Q
I
OP
I
LEAK
VSWR
MAX
No RF
P
OUT
= +25 dBm
No RF input, module in
standby mode
CW
6:1
50
300
2
8:1
55
350
mA
mA
μA
–
Evaluation Board Description
The SKY65338 Evaluation Board is used to test the performance
of the SKY65338 FEM. The Evaluation Board schematic diagram
is shown in Figure 6. An assembly drawing for the Evaluation
Board is shown in Figure 7 and the layer detail is provided in
Figure 8. The layer detail physical characteristics are noted in
Figure 9. 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 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 is shown in
Figure 10. Package dimensions for the 12-pin MCM are shown in
Figure 11, and tape and reel dimensions are provided in
Figure 12.
Electrostatic Discharge (ESD) Sensitivity
The SKY65338 is a static-sensitive electronic device. Do not
operate or store near strong electrostatic fields. Take proper ESD
precautions.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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May 1, 2009 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201004B
PRELIMINARY DATA SHEET • SKY65338 TRANSMIT/RECEIVE FRONT-END MODULE
6.5
6.3
Transmit Noise Figure (dB)
6.1
5.9
5.7
5.5
450
455
460
465
470
S1355
Frequency (MHz)
Figure 3. Noise Figure vs Frequency
+28
+26
+24
+22
Output
Power
430
400
370
340
310
280
250
220
Operating
Current
190
160
130
100
70
40
–26
–22
–18
–14
–10
–6
–2
S1356
Output Power (dBm)
+20
+18
+16
+14
+12
+10
+8
+6
+4
+2
–30
Input Power (dBm)
Figure 4. Output Power and Current Consumption vs Input Power
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201004B • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • May 1, 2009
5
Operating
Current
(mA)
嵌入式系统
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