DATA SHEET
SKY65326-11: 380-500 MHz Transmit/Receive Front-End
Module
Applications
Tetra radio
Remote metering
GSM
WLL transmitters
Description
Skyworks SKY65326-11 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). 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 SKY65326-11 is shown in Figure 1. The
device package and pinout for the 12-pin MCM are shown in
Figure 2.
Features
Transmit output power > +30 dBm
High PAE = 45%
High gain in transmit path: 34 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.
SPDT
Switch
Transmit
Port
PA
Antenna
Port
Receive
Port
S1346
Figure 1. SKY65326-11 Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201060E • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • January 5, 2010
1
DATA SHEET • SKY65326-11 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
VREF1
VC_BIAS
VREF2
S1347
Figure 2. SKY65326-11 Pinout – 12-Pin MCM
(Top View)
Table 1. SKY65326-11 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 SKY65326-11 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 SKY65326-11 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 a 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
SKY65326-11 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 SKY65326-11 are
illustrated in Figures 3 through 6.
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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January 5, 2010 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201060E
DATA SHEET • SKY65326-11 TRANSMIT/RECEIVE FRONT-END MODULE
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The SKY65326-11 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. SKY65326-11 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. SKY65326-11 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. SKY65326-11 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
201060E • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • January 5, 2010
3
DATA SHEET • SKY65326-11 TRANSMIT/RECEIVE FRONT-END MODULE
Table 5. SKY65326-11 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
)
f
G
P
SAT
NF
Pf2
Pf3
Pf4
Pf5
Pf6 to Pf10
PAE
R
X
_
LOSS
I
SOL
S11
S22
I
Q
I
OP
I
LEAK
,
PA_EN <0.2 V
VSWR
MAX
No RF
P
OUT
= +30 dBm
No RF input, module in
standby mode
CW
6:1
CW
27
15
10
CW, P
OUT
= +30 dBm
30
30
30
30
30
42
CW, P
IN
= –30 dBm
CW, P
IN
= +2 dBm
32.8
+30
Symbol
Test Condition
Min
Typical
460
34.0
+30.7
5.5
32
36
41
50
55
45
0.5
30
17
12
60
615
1
8:1
66
660
2
0.7
6.5
Max
Units
MHz
dB
dBm
dB
dBc
dBc
dBc
dBc
dBc
%
dB
dB
dB
dB
mA
mA
μA
–
Power Added Efficiency
Receive path insertion loss
Transmit/receive path isolation
Input return loss
Output return loss
Quiescent current
Operating current
Leakage current
Maximum VSWR for stable operation
CW, P
OUT
= +30 dBm
Evaluation Board Description
The SKY65326-11 Evaluation Board is used to test the
performance of the SKY65326-11 FEM. The Evaluation Board
schematic diagram is shown in Figure 7. An assembly drawing for
the Evaluation Board is shown in Figure 8 and the layer detail is
provided in Figure
9.
The layer detail physical characteristics are
noted in Figure 10. 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 SKY65326-11 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 SKY65326-11 is shown
in Figure 11. Package dimensions for the 12-pin MCM are shown
in Figure 12, and tape and reel dimensions are provided in
Figure 13.
Electrostatic Discharge (ESD) Sensitivity
The SKY65326-11 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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January 5, 2010 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 201060E
DATA SHEET • SKY65326-11 TRANSMIT/RECEIVE FRONT-END MODULE
+32
+30
+28
+26
Output
Power
Operating
Current
700
650
600
550
500
450
400
350
300
+24
+22
+20
+18
250
+16
+14
+12
–20
–18
–16
–14
–12
–10
–8
–6
–4
–2
0
+2
+4
S1384
200
150
100
Input Power (dBm)
Figure 3. Output Power and Current Consumption vs Input Power
36
35
34
Gain
33
50
45
40
35
30
25
20
15
Gain
(dB)
32
31
30
PAE
10
5
0
29
28
+10
+12
+14
+16
+18
+20
+22
+24
+26
+28
+30
+32
S1385
Output Power (dBm)
Figure 4. Gain and PAE vs Output Power
+31.0
+30.5
+30.0
Output Power (dBm)
+29.5
+29.0
+28.5
+28.0
+27.5
+27.0
+26.5
+26.0
380
400
420
440
460
480
500
S1519
+25
o
C
+85
o
C
–40
o
C
Frequency (MHz)
Figure 5. Saturated Power vs Frequency Over Temperature
(VCC = 3.6 V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201060E • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • January 5, 2010
5
PAE (%)
Operating
Current
(mA)
Output Power (dBm)
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