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200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 1
DATA SHEET
SKY14151-350LF: 20 MHz-2.5 GHz High Power SP4T Switch
With Decoder
Applications
GSM/WCDMA/EDGE datacards and handsets
Mobile high power switching systems
Features
Broadband frequency range: 20 MHz to 2.5 GHz
Low insertion loss: 0.40 dB @ 1 GHz, 0.45 dB @ 2 GHz with
high isolation (29 dB @ 1 GHz)
VDD: 2.5 to 3.0 V for high power applications; can be used down
to 1.8 V for low power applications
High linearity IMD < –111 dBm over phase
Good harmonic performance < –80 dBc @ 0.9 GHz
Low voltage logic compatible (minimum VHIGH = 1.8 V)
Small, QFN (16-pin, 3 x 3 mm) package (MSL1, 260 C per
JEDEC J-STD-020)
RF1
RF2
RF3
ANT
RF4
CTRL1 CTRL2
S1947
Figure 1. SKY14151-350LF Block Diagram
Description
The SKY14151-350LF is a symmetrical, single-pole, four-throw
(SP4T) switch. The device is designed for broadband, high power
switching applications that demand high linearity and low
insertion loss. This is a general purpose switch optimized for a
variety of multimode applications such as GSM/WCDMA/EDGE.
The switch is manufactured using Skyworks state-of-the-art
pHEMT process. The SKY14151-350LF features integrated logic
that uses only two control lines for switch operation. The low
current consumption makes the device suitable for battery-
operated applications.
The SKY14151-350LF SP4T switch is provided in a compact Quad
Flat No-Lead (QFN) 3 x 3 mm package. A functional block
diagram is shown in Figure 1. The pin configuration and package
are shown in Figure 2. Signal pin assignments and functional pin
descriptions are provided in Table 1.
S1948
GND 1
2
3
4
5678
1615 14 13
12
11
10
9
VDD
CTRL2
CTRL1
GND
RF1
GND
RF2
N/C
RF3
GND
RF4
GND
ANT
GND
GND
Figure 2. SKY14151-350LF Pinout – 16-Pin QFN
(Top View)
DATA SHEET • SKY14151-350LF SP4T SWITCH
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Table 1. SKY14151-350LF Signal Descriptions
Pin # Name Description Pin # Name Description
1 GND Ground 9 GND Ground
2 VDD Supply voltage input. The voltage may be
switched. The switching time must be no longer
than the start-up time.
10 GND Ground
3 CTRL2 Control signal 2. The logic level applied to this
pin, along with the logic level applied to pin 4,
controls the state of the switch.
11 ANT Antenna. This pin is connected directly and
exclusively to pin 6, 8, 13, or 15 depending on
the control voltage applied to pins 3 and 4. A DC
blocking capacitor is required.
4 CTRL1 Control signal 1. The logic level applied to this
pin, along with the logic level applied to pin 3,
controls the state of the switch.
12 GND Ground
5 GND Ground 13 RF1 RF output 1. This pin is either connected directly
to or is disconnected from pin 11, depending on
the control voltage applied to pins 3 and 4. A DC
blocking capacitor is required.
6 RF4 RF output 4. This pin is either connected directly
to or is disconnected from pin 11, depending on
the control voltage applied to pins 3 and 4. A DC
blocking capacitor is required.
14 GND Ground
7 GND Ground 15 RF2 RF output 2. This pin is either connected directly
to or is disconnected from pin 11, depending on
the control voltage applied to pins 3 and 4. A DC
blocking capacitor is required.
8 RF3 RF output 3. This pin is either connected directly
to or is disconnected from pin 11, depending on
the control voltage applied to pins 3 and 4. A DC
blocking capacitor is required.
16 N/C No connection.
Table 2. SKY14151-350LF Absolute Maximum Ratings
Parameter Symbol Minimum Maximum Units
Supply voltage VDD 3 V
Input power (20 MHz to 2.5 GHz,
VDD = 2.5 to 3.0 V)
PIN +36 dBm
Control voltage CTRL1, CTRL2 3 V
Operating temperature TOP –40 +85 C
Storage temperature TSTG –50 +100 C
Note: 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. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 3
Functional Description
The SKY14151-350LF is comprised of a CMOS decoder that
enables two TTL-compatible DC lines to control four RF ports. The
decoder is internally connected to a GaAs pHEMT RF switch.
Depending on the logic voltage level applied to the control pins,
the ANT pin is connected to one of four switched RF outputs (RF1,
RF2, RF3, or RF4) by a low insertion loss path, while maintaining
a high isolation path to the alternate port.
Startup time is defined as the time from when VDD is applied to
when the switch is active. Once the startup time has passed, the
control voltages CTRL1 and CTRL2 can be applied. RF power
should not be applied during the startup time or damage to the
device could result.
The recommended startup sequence is:
Step 1: Apply VDD.
Step 2: Apply CTRL1 and CTRL2
Step 3: Apply RF input.
The device must be turned off in the reverse order.
When VDD is not applied, the device is considered off or inactive.
All arms of the switch remain on in this state, creating a poor
four-way power splitter. The return loss of all RF ports is very low
in this state. RF should not be applied when VDD is not present
and should only be used to conserve current.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY14151-350LF are
provided in Table 2. Electrical specifications are provided in
Table 3.
The state of the SKY14151-350LF is determined by the logic
provided in Table 4.
Typical performance characteristics of the SKY14151-350LF are
illustrated in Figures 3 through 10.
Figure 11 illustrates the test setup used to measure data for 3rd
Order Intermodulation Distortion (IMD3) testing. Figure 12
illustrates the test setup used to measure triple beat ratio data.
Table 3. SKY14151-350LF Electrical Specifications (1 of 3) (Note 1)
(VDD = 2.65 V, CTRL1 = CTRL2 = VDD, TOP = +25 C, All Unused RF Ports are Terminated in a 50 Ω Load, Unless Otherwise Noted)
Parameter Symbol Test Condition Min Typical Max Units
RF Specifications
Insertion loss IL 0.02 to 1.0 GHz
1.0 to 2.0 GHz
2.0 to 2.1 GHz
0.40
0.45
0.50
0.50
0.60
0.60
dB
dB
dB
Isolation ISO 0.02 to 1.0 GHz
1.0 to 2.0 GHz
2.0 to 2.1 GHz
26
19
19
29
24
23
dB
dB
dB
Return loss |S11| 0.02 to 2.5 GHz, all RF
ports, insertion loss state
15 dB
Second harmonic 2fo fFUND = 900 MHz,
PIN = +34.5 dBm
fFUND = 0.12 GHz,
PIN = +10 dBm
fFUND = 0.4 GHz,
PIN = +10 dBm
fFUND = 1.8 GHz,
PIN = +31.5 dBm
–75
–75
–80
–70
–80
–80
–90
–85
dBc
dBc
dBc
dBc
Third harmonic 3fo fFUND = 900 MHz,
PIN = +34.5 dBm
fFUND = 0.12 GHz,
PIN = +10 dBm
fFUND = 0.4 GHz,
PIN = +10 dBm
fFUND = 1.8 GHz,
PIN = +31.5 dBm
–70
–80
–80
–70
–80
–90
–90
–80
dBc
dBc
dBc
dBc
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4 October 6, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200983H
Table 3. SKY14151-350LF Electrical Specifications (2 of 3) (Note 1)
(VDD = 2.65 V, CTRL1 = CTRL2 = VDD, TOP = +25 C, All Unused RF Ports are Terminated in a 50 Ω Load, Unless Otherwise Noted)
Parameter Symbol Test Condition Min Typical Max Units
RF Specifications (continued)
Input 0.1 dB compression point P0.1dB @ 48 MHz
@ 900 MHz
@ 1.8 GHz
+37.0
+34.0
+38.5
+38.0
+35.0
dBm
dBm
dBm
3rd Order Intermodulation Distortion IMD3 fFUND = 1.95 GHz @
+20 dBm,
fBLK = 1.76 GHz
@ –15 dBm,
fRX = 2.14 GHz, worst
case over phase. See
Figure 9.
–111 dBm
Power handling under mismatch @ 900 MHz, VSWR = 20:1
@ 1.8 GHz, VSWR = 20:1
+34.5
+31.5
dBm
dBm
2nd Order Input Intercept Point IIP2 f0 = 836.61 MHz
@ +26 dBm,
f2 = 1718.22 MHz
@ –20 dBm, measured
@ 881.61 MHz
+113.5 dBm
Switching speed 10/90% RF rise/fall time 5 μs
Startup time Wait time required from
when VDD is applied until
control voltage can be
applied
25 μs
Triple beat ratio (matched) 3BR f1 = 1880 MHz,
P1 = +21.5 dBm,
f2 = 1881 MHz,
P2 = +21.5 dBm,
fJAMMER = 1960 MHz,
PJAMMER = –30 dBm,
measured @ 1959 MHz
and 1961 MHz for worst
case, 50 Ω load
f1 = 891.025 MHz
@ +14 dBm,
f2 = 892.025 MHz,
P2 = +14 dBm,
fJAMMER = 836.0125 MHz,
PJAMMER = –30 dBm,
measured @
835.0125 MHz and
837.0125 MHz for worst
case, 50 Ω load
f1 = 825.995 MHz,
P1 = +21.5 dBm,
f2 = 826.995 MHz,
P2 = +21.5 dBm,
fJAMMER = 870.995 MHz,
PJAMMER = –30 dBm,
measured @
869.995 MHz and
871.995 MHz for worst
case, 50 Ω load
+81
+81
+81
+82
+82
+82
dBc
dBc
dBc
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 5
Table 3. SKY14151-350LF Electrical Specifications (3 of 3) (Note 1)
(VDD = 2.65 V, CTRL1 = CTRL2 = VDD, TOP = +25 C, All Unused RF Ports are Terminated in a 50 Ω Load, Unless Otherwise Noted)
Parameter Symbol Test Condition Min Typical Max Units
RF Specifications (continued)
Triple beat ratio (2:1 VSWR) 3BR f1 = 1880 MHz,
P1 = +21.5 dBm,
f2 = 1881 MHz,
P2 = +21.5 dBm,
fJAMMER = 1960 MHz,
PJAMMER = –30 dBm,
measured @ 1959 MHz
and 1961 MHz for worst
case over phase, 2:1
VSWR load
f1 = 891.025 MHz,
P1 = +14 dBm,
f2 = 892.025 MHz,
P2 = +14 dBm,
fJAMMER = 836.0125 MHz,
PJAMMER = –30 dBm,
measured @
835.0125 MHz and
837.0125 MHz for worst
case over phase, 2:1
VSWR load
f1 = 825.995 MHz,
P1 = +21.5 dBm,
f2 = 826.995 MHz,
P2 = +21.5 dBm,
fJAMMER = 870.995 MHz,
PJAMMER = –30 dBm,
measured @
869.995 MHz and
871.995 MHz for worst
case over phase, 2:1
VSWR load
+81
+81
+81
+82
+82
+82
dBc
dBc
dBc
DC/Control Specifications
Switched supply voltage (Note 2) VDD 1.8 2.0 3.00 V
Switched supply current IDD 0.3 mA
Control voltage:
High
Low
CTRL1, CTRL2
1.80 (Note 3)
2.65
0
3.00
0.3
V
V
Control current:
High
Low
ICTL
0.5
0.5
μA
μA
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Note 2: For best receiver sensitivity, VDD is recommended to be between 1.8 and 2.0 V with CTRL1/2 (high) no larger than VDD.
Note 3: For 1.8 V control, VDD must be ≤ 2.65 V.
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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Table 4. SKY14151-350LF Truth Table
State CTRL1 (Pin 4) CTRL2 (Pin 3) RF Path
1 VLOW VLOW ANT to RF1
2 VLOW VHIGH ANT to RF2
3 VHIGH VLOW ANT to RF3
4 VHIGH VHIGH ANT to RF4
Note: VHIGH = 1.8 V to VDD
VLOW = 0 to 0.3 V
Any state other than described in this Table places the switch into an undefined state.
Typical Performance Characteristics
(VDD = 2.5 to 3.0 V, CTRL1 = CTRL2 = VDD, TOP = +25 C, All Unused RF Ports are Terminated in a 50 Ω Load, Unless Otherwise Noted)
–0.9
–1.0
–0.8
–0.7
–0.6
–0.5
–0.4
–0.3
–0.2
–0.1
0
0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Insertion Loss (dB)
RF1
RF2
RF3
RF4
Figure 3. Insertion Loss vs Frequency
–40
–35
–30
–25
–20
–15
–10
–5
0
0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Isolation (dB)
ANT to RF1
ANT to RF3
ANT to RF4
Figure 5. Isolation vs Frequency
(ANT to RF2 Insertion Loss State)
–40
–35
–30
–25
–20
–15
–10
–5
0
0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Isolation (dB)
ANT to RF2
ANT to RF3
ANT to RF4
Figure 4. Isolation vs Frequency
(ANT to RF1 Insertion Loss State)
–40
–35
–30
–25
–20
–15
–10
–5
0
0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Isolation (dB)
ANT to RF1
ANT to RF2
ANT to RF4
Figure 6. Isolation vs Frequency
(ANT to RF3 Insertion Loss State)
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 7
–40
–35
–30
–25
–20
–15
–10
–5
0
0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Isolation (dB)
ANT to RF1
ANT to RF2
ANT to RF3
Figure 7. Isolation vs Frequency
(ANT to RF4 Insertion Loss State)
–130
–125
–120
–115
–110
–105
–100
0204060 80 100 120 140 160 180
Phase (deg)
IMD3 (dBm)
Figure 9. 3rd Order Intermodulation Distortion vs Phase
–40
–35
–30
–25
–20
–15
–10
–5
0
0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Input Return Loss (dB)
RF1
RF2
RF3
RF4
Figure 8. Input Return Loss vs Frequency
–1
+2
+1
0
+3
+4
+5
0.60.8 1.0 1.2 1.4 1.61.8 2.0 2.2
Frequency (GHz)
Noise Figure (dB)
Note: For best receiver sensitivity, VDD is recommended to be between 1.8 and 2.0 V
with CTRL1/2 (high) no larger than VDD.
Figure 10. Typical Noise Figure vs Frequency
(VDD = 2 V, CTRL1/2 = 1.8 V)
Signal Generator
f
FUND
= 1950 MHz,
@ +20 dBm
Spectrum Analyzer
f
RX
= 2140 MHz
Signal Generator
f
BLK
= 1760 MHz
@ –15 dBm
Coupler to Monitor
Input Power
Circulator
f
BLK
1760 MHz
@ –15 dBm
f
FUND
1950 MHz
@ +20 dBm
f
RX
2140 MHz,
Measure Tone
1950 MHz
Bandpass Filter
1760 MHz
Bandpass Filter
Duplexer Phase Shifter
SKY14151-350LF
P
FUND
= +20 dBm
P
BLK
= –15 dBm
S1909a
Circulator
Figure 11. 3rd Order Intermodulation Test Setup
DATA SHEET • SKY14151-350LF SP4T SWITCH
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f
1
f
2
f
JAMMER
f
1
, f
2
f
JAMMER
f
JAMMER
SKY14151-350LF
P
IN1
, P
IN2
,
P
INJAMMER
P
3BL
, P
3BH
P
3BL
P
JAMMER
P
3BH
Z
L
LPF
LPF
10 dB
30 dB
10 dB 10 dB
Spectrum
Analyzer
P
f
10 dB
Circulator
Circulator
Circulator
P (dBm)
f
3BR
L
= P
JAMMER
– P
3BL
3BR
H
= P
JAMMER
– P
3BH
3BR = Min(3BR
L
, 3BR
H
)
f
3BL
= f
JAMMER
– (f
2
– f
1
)f
3BH
= f
JAMMER
+ (f
2
– f
1
)f
JAMMER
Combiner
Directional Coupler
Phase Shifter
Power Meter
Testing under mismatched conditions over phase
or
testing under matched conditions: Z
L
= 50 Ω
S1972
Figure 12. Triple Beat Ratio (3BR) Test Setup
Evaluation Board Description
The SKY14151-350LF Evaluation Board is used to test the
performance of the SKY14151-350LF SP4T Switch. An Evaluation
Board schematic diagram is provided in Figure 13. An assembly
drawing for the Evaluation Board is shown in Figure 14.
Components C3 and L1 constitute an ESD filter. This topology and
the component values noted in Figure 13 may vary according to
the ESD requirement and acceptable insertion loss for a specific
application.
Decoupling capacitors (C3 through C6) are recommended to
suppress noise and to prevent RF leakage into the DC control
circuits.
DC blocking capacitors C1, C2, C7, C8, and C9 determine the low
frequency operation of the switch. Increase the capacitor values
to lower operation frequency.
DATA SHEET • SKY14151-350LF SP4T SWITCH
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200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 9
C4
10 nF
C5
100 pF
C6
100 pF
C7
100 pF
C8
100 pF
S1950
Note: Some component labels may be different than the
corresponding component symbol shown here.
Component values, however, are accurate as of the
date of this Data Sheet.
Use 10 nF DC blocking capacitors (C1, C2, C7, C8,
and C9) for <50 MHz operation.
GND
VDD
Supply Voltage
CTRL2
CTRL1
GND
ANT
GND
GND
GND
RF4
GND
RF3
N/C
RF2
GND
RF1
4
5678
1615 14 13
3
2
1
9
10
11
12
×
Control Signal 2
Control Signal 1
RF Output 4 RF Output 3
C1
100 pF
RF Output 2
C2
100 pF
RF Output 4
C9
100 pF
C3
1 pF
L1
10 nH
Antenna
Figure 13. SKY14151-350LF Evaluation Board Schematic
V1 V2 VDD VBAT
RF2
RF4
RF1
ANT
RF3
S1949
Figure 14. SKY14151-350LF Evaluation Board Assembly Diagram
DATA SHEET • SKY14151-350LF SP4T SWITCH
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Package Dimensions
The PCB layout footprint for the SKY14151-350LF is provided in
Figure 15. Typical case markings are shown in Figure 16.
Package dimensions for the 16-pin QFN are shown in Figure 17,
and tape and reel dimensions are provided in Figure 18.
Package and Handling Information
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 SKY14151-350LF 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.
Detail A
Exposed
Soldering
Area
0.25
0.60
See Detail A
4x Plated Through Vias
1.70
12X 0.50 Pitch
16X 1.10
0.25
Metal Ground Pad 1.70
0.225 X 45o
All dimensions are in millimeters S1691
Figure 15. SKY14151-350LF PCB Layout Footprint
(Top View)
DATA SHEET • SKY14151-350LF SP4T SWITCH
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200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 11
Pin 1
Indicator
Skyworks Part #
Lot #
Date Code:
(Y = Calendar Year
WW = Week)
Figure 16. Typical Case Markings
(Top View)
S1692
Top View Side View Bottom View
0.15 C
Pin 1
Indicator
2X
0.15 C
2X
0.08 C
16X2
C
0.10
3.00
3.00
–A–
–B–
–C–
(0.20)
Seating Plane
O.225 x 45o
Pin 1 Indicator
Detail A
Detail B
0.02 + 0.03/–0.02
0.85
0.85
0.5
0.25
1.70 +0.10/–0.15
0.40 ± 0.10
1.70 +0.10/–0.15
0.25 +0.05/–0.07
Exposed Pad
0.75 ± 0.05
–B–
–A–
0.10 M C A B
Detail B
Scale: 10X
Detail A
Scale: 20X
16 Places
A
ll measurements are in millimeters.
Dimensioning and tolerancing according to ASME Y14.5M-1994.
Coplanarity applies to the exposed heat sink slug as well as the terminals..
Plating requirement per source control drawing (SCD) 2504.
0.05 M C
Figure 17. SKY14151-350LF 16-Pin QFN Package Dimensions
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
12 October 6, 2010 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200983H
S1698
8.00 ± 0.10
R0.25 Typ.
12.00 ± 0.30
4.00 ± 0.10
5.50 ± 0.05
2.00 ± 0.05
1.75 ± 0.10
Pin #1
∅1.50 + 0.1/–0.0
3.30 ± 0.10 (Ao)
3.30 ± 0.10 (Bo)
A
B
∅1.50 Min.
A
B
B
A
Notes:
1. Carrier tape: black conductive polystyrene, non-bakeable material.
2. Cover tape material: transparent conductive HSA.
3. Cover tape size: 9.20 mm width.
4. All measurements are in millimeters.
0.30 ± 0.05 (T)
1.10 ± 0.10 (Ko)
Figure 18. SKY14151-350LF Tape and Reel Dimensions
DATA SHEET • SKY14151-350LF SP4T SWITCH
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200983H • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 6, 2010 13
Ordering Information
Model Name Manufacturing Part Number Evaluation Board Part Number
SKY14151-350LF SP4T Switch SKY14151-350LF SKY14151-350LF-EVB
Copyright © 2008, 2009, 2010 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by
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