Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
SKY12146-321LF: 3.0 – 3.8 GHz, 20 dB Variable Voltage
Attenuator
Applications
• WLANs
• WiMAX systems
Features
• Power control for 3.5 GHz fixed wireless applications
• Typical attenuation: 20 dB
• Control voltage:0 to 1.4 V
• Low cost
• No external components needed
• Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 °C per
JEDEC J-STD-020)
Figure 1. SKY12146-321LF Block Diagram
Description
The SKY12146-321LF is a GaAs pHEMT variable voltage
attenuator designed for WLAN and WiMAX applications. The
device operates within 3.2 to 3.8 GHz and is ideal for low-cost
applications such as 3.5 GHz fixed wireless LANs and WiMAX
power control systems.
The SKY12146-321LF is provided in a 12-pin, 3 x 3 mm Quad Flat
No-Lead (QFN) 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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Figure 2. SKY12146-321LF Pinout – 12-Pin QFN
(Top View)
Table 1. SKY12146-321LF Signal Descriptions
Pin #
Description
Pin #
Name
Description
J1
RF input/output
7
N/C
No connection
2
N/C
No connection
8
N/C
No connection
3
N/C
No connection
9
J2
RF input/output
4
N/C
No connection
10
N/C
No connection
5
VC
Voltage control
11
N/C
No connection
N/C
No connection
12
N/C
No connection
6
Note:
Name
1
Exposed pad must be grounded. N/C pins may be grounded with no change in performance.
Table 2. SKY12146-321LF Absolute Maximum Ratings
Parameter
Symbol
Minimum
Typical
Maximum
Units
+30
dBm
RF input power
PIN
Control voltage
VCTL
–0.5
+6.0
V
Operating temperature
TOP
–40
+85
°C
Storage temperature
TSTG
–65
+150
°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.
Technical Description
Electrical and Mechanical Specifications
The SKY12146-321LF Variable Voltage Attenuator uses GaAs
pHEMTs as voltage-controlled attenuating elements. To maintain
impedance matching within operating frequencies, the GaAs
pHEMTs are coupled to the RF input and output through an
integrated hybrid-coupler. Since no temperature compensation is
used in this product, the attenuation value at any fixed bias
voltage varies with operating temperature.
The absolute maximum ratings of the SKY12146-321LF are
provided in Table 2. Electrical specifications are provided in
Table 3.
Typical performance characteristics of the SKY12146-321LF are
illustrated in Figures 3 through 8.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Table 3. SKY12146-321LF Electrical Specifications (Note 1)
(TOP = 25 °C, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted)
Parameter
Insertion loss
Symbol
IL
Test Condition
Min
Attn
Return loss
|S11|
Switching characteristics:
Rise, fall
On, off
Video feedthrough
Max
Units
1.4
1.5
1.6
1.8
dB
dB
dB
VC = 1.4 V
2.7 to 3.2 GHz
3.2 to 3.8 GHz
3.8 to 4.0 GHz
Attenuation
Typical
VC = 0 V
2.7 to 3.2 GHz
3.2 to 3.8 GHz
3.8 to 4.0 GHz
18.0
20.0
20.0
20.5
dB
dB
dB
2.7 to 3.2 GHz
3.2 to 3.8 GHz
3.8 to 4.0 GHz
11
12
14
27
dB
dB
dB
10/90% or 90/10% RF
50% VCTL to 90/10% RF
TRISE = 1 ns, bandwidth =
500 MHz
50
150
ns
ns
25
mV
Maximum input power for <1 dB attenuation
variation
PIN
3.2 to 3.8 GHz
+13
dBm
3rd Order Input Intercept Point
IIP3
3.2 to 3.8 GHz
+20
dBm
Control voltage
VCTL
Control current
ICTL
0
1.4
5
V
μA
Note 1: Performance is guaranteed only under the conditions listed in this Table.
Typical Performance Characteristics
(TOP = 25 °C, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted)
Figure 3. Typical Insertion Loss
(VC = 1.4 V)
Figure 4. Typical Insertion Loss vs VC
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Figure 5. Typical Input Return Loss vs VC
Figure 6. Typical Output Return Loss vs VC
Figure 7. Typical Loss vs Control Voltage
Figure 8. IIP3 vs Frequency
Evaluation Board Description
Package and Handling Information
The SKY12146-321LF Evaluation Board is used to test the
performance of the SKY12146-321LF attenuator. An assembly
drawing for the Evaluation Board is shown in Figure 9 and an
Evaluation Board schematic diagram is shown in Figure 10.
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.
Package Dimensions
The PCB layout footprint for the SKY12146-321LF is shown in
Figure 11. Typical case markings are noted in Figure 12. Package
dimensions for the 12-pin QFN are shown in Figure 13, and tape
and reel dimensions are provided in Figure 14.
THE SKY12146-321LF is rated to Moisture Sensitivity Level 1
(MSL1) at 260 °C. It can be used for lead or lead-free soldering.
For additional information, refer to the Skyworks Application Note,
Solder Reflow Information, document number 200164.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Figure 9. SKY12146-321LF Evaluation Board Assembly Diagram
Figure 10. SKY12146-321LF Evaluation Board Schematic Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Figure 11. SKY12146-321LF PCB Layout Footprint
Figure 12. Typical Part Markings
(Top View)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Figure 13. SKY12146-321LF 12-Pin QFN Package Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200270J • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 11, 2011
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DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Figure 14. SKY12146-321LF Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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April 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200270J
DATA SHEET • SKY12146-321LF VARIABLE VOLTAGE ATTENUATOR
Ordering Information
Model Name
SKY12146-321LF Differential Digital Attenuator
Manufacturing Part Number
SKY12146-321LF
Evaluation Board Part Numbers
SKY12146-321LF-EVB
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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