Data Sheets - Skyworks Solutions, Inc.

DATA SHEET
SKY12230-12LF: High IIP3, 1.7 to 2.3 GHz Variable Attenuator
Applications
Control
Current
Control
Current
RF
In/Out
RF
In/Out
 Automatic power leveling/gain control circuits in cellular base
stations and point-to-point radio IF chains
 General wireless systems including LTE, WCDMA, VSAT, and
military communications
Features
 SOIC (8-pin, 6.0 x 4.9 mm) package
(MSL3, 260 C per JEDEC J-STD-020)
Skyworks GreenTM products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of GreenTM, document number
SQ04–0074.
S3206
 Broadband operating range: 1.7 to 2.3 GHz
 Attenuation range: >18.5 dB
 Low insertion loss: 1.2 dB
 High IIP3: +53 dBm typical
 Low current consumption: <2 mA @ maximum attenuation
Figure 1. SKY12230-12LF Block Diagram
Description
The SKY12230-12LF is a current-controlled variable attenuator
from Skyworks series of high third order input intercept point
(IIP3) components. The device has been designed to operate over
the 1.7 to 2.3 GHz frequency band, but is specifically optimized
for use as a wide dynamic range, low distortion attenuator.
The SKY12230-12LF provides monotonic attenuation performance
over its entire control current range. This attenuator is comprised
of a pair of matched PIN diodes that terminate two ports of its
internal 90-degree hybrid coupler. The diodes are biased using an
external control current signal. The attenuator operates with a
control current range of 0 to 1.3 mA.
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
202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2014
1
I_CONTROL
GND
GND
RF_OUT
8
7
6
5
1
2
3
4
I_CONTROL
GND
GND
RF_IN
DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
S3218
Figure 2. SKY12230-12LF Pinout – 8-Pin SOIC
(Top View)
Table 1. SKY12230-12LF Signal Descriptions
Pin
Name
Description
Pin
Name
Description
1
I_CONTROL
Control current input (current applied is
nominally equal to the current applied to pin 8)
5
RF_OUT
RF output. Input and output are
interchangeable.
2
GND
Ground. Must be connected to PCB ground using
lowest possible inductance path.
6
GND
Ground. Must be connected to PCB ground
using lowest possible inductance path.
3
GND
Ground. Must be connected to PCB ground using
lowest possible inductance path.
7
GND
Ground. Must be connected to PCB ground
using lowest possible inductance path.
4
RF_IN
RF input. Input and output are interchangeable.
8
I_CONTROL
Control current input (current applied is
nominally equal to the current applied to pin 1)
Technical Description
The SKY12230-12LF is comprised of a matched pair of silicon PIN
attenuator diodes and a hybrid coupler. Each of the PIN diodes
terminate a coupled ouptut of the coupler.
The impedance of these diodes is controlled by a current applied
from an external source. At 0 mA bias, the impedance of the
diode is very large. As the impedance of these diodes varies from
a very large magnitude to 50 Ω, the insertion loss between the
input (pin 4) and output (pin 5) ports of the hybrid varies from low
to maximum attenuation. If the bias current is increased beyond
the value that produces a 50 Ω resistance in each diode, the
attenuation between the input and output decreases.
Diodes D1 and D2 are RF terminations, so it is important to
provide the control current to these diodes using low-pass filters.
Each of the filters has a 22 nH series inductor and a shunt 220 pF
capacitor. The values of these components are selected for best
DC bypassing and RF blocking of the RF signals present at the
anodes of both diodes.
A 1.8 kΩ resistor serves as a voltage-to-current converter. In the
forward biased state, the DC voltage produced across D1 and D2
is roughly 0.7 V. The total control current to the PIN diodes is
approximated by the following equation:
I CONTROL 
VCONTROL  0.7 
1800
Approximately 50 percent of the control current (ICONTROL) flows
equally through each diode. The forward voltages are very well
matched since both diodes are manufactured on a single die. The
control voltage (VCONTROL) should be varied from 0 V for minimum
attenuation up to a voltage that produces the appropriate current
to force each of the PIN diodes to produce 50 Ω and, therefore,
maximum attenuation.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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April 6, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202532D
DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
Electrical and Mechanical Specifications
Performance characteristics for the SKY12230-12LF are
illustrated in Figures 3 through 6.
The absolute maximum ratings of the SKY12230-12LF are
provided in Table 2. Electrical specifications are provided in
Table 3.
Table 2. SKY12230-12LF Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Minimum
Maximum
Units
10
V
0.5
4.0
W
W
Reverse diode voltage
VREVERSE
RF input power:
CW
@ 12.5% duty cycle
PIN
Control current
ICONTROL
50
mA
Storage temperature
TSTG
–65
+125
C
Operating temperature
TOP
–40
+85
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. 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.
Table 3. SKY12230-12LF Electrical Specifications (Note 1)
(TOP = +25 C, ICONTROL = 0 to 1.3 mA, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted)
Parameter
Symbol
Test Condition
Min
Insertion loss
IL
ICONTROL = 0 mA,
f = 1.7 to 2.3 GHz
Attenuation
Attn
ICONTROL = 1.3 mA,
f = 2.15 GHz
18.5
Return loss
RL
ICONTROL = 0 mA,
f = 1.7 to 2.3 GHz
9.5
Third order input intercept point
IIP3
PIN = 0 dBm each tone,
ICONTROL = 0 mA,
spacing = 10 MHz,
f = 1.7 to 2.3 GHz
Switching characteristics:
Rise, fall time
On, off time
tRISE, tFALL
tON, tOFF
10/90% or 90/10% of RF
50% VCONTROL to 90/10%
of RF
Typical
Max
Units
1.3
1.5
dB
39.0
dB
22.0
dB
+53
dBm
3
μs
1
μs
Note 1: Performance is guaranteed only under the conditions listed in this table.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015
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DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
Typical Performance Characteristics
(TOP = +25 C, VCONTROL = 0 to 3.0 V, PIN = 0 dBm, Characteristic Impedance [Zo] = 50 Ω, Unless Otherwise Noted)
0
–10
238 μA
0 μA
–15
–10
Return Loss (dB)
Insertion Loss (dB)
–5
760 μA
–15
–20
1357 μA
1301 μA
–25
–30
0V
1V
2V
3V
1411 μA
1464 μA
–35
–40
1.7
1.8
1.9
2.0
2.1
3.1 V
3.2 V
3.3 V
2.2
–20
–25
–30
0V
1.0 V
2.0 V
3.0 V
3.1 V
–35
–40
1.7
2.3
1.8
1.9
Frequency (GHz)
2.2
2.3
Figure 4. Return Loss vs Frequency vs Control Voltage
+60
0
1.7 GHz
2.0 GHz
2.2 GHz
+55
–10
Attenuation (dB)
+45
+40
+35
–15
–20
–25
–30
+30
–35
+25
–40
0
0.5
1.0
1.5
2.0
2.5
3.0
1.7 GHz
2.0 GHz
2.3 GHz
–5
+50
IIIP3 (dBm)
2.1
Frequency (GHz)
Figure 3. Insertion Loss vs Frequency vs Control Voltage
+20
2.0
3.2 V
3.3 V
3.4 V
3.5 V
3.6 V
3.5
Control Voltage (V)
Figure 5. IIP3 vs Control Voltage vs Frequency
(PIN = 0 dBm, Spacing = 10 MHz)
–45
0
200
400
600
800
1000
1200
1400
1600
1800
Control Current (μA)
Figure 6. Attenuation vs Control Current vs Frequency
Evaluation Board Description
Package and Handling Information
The SKY12230-12LF Evaluation Board is used to test the
performance of the SKY12230-12LF variable attenuator. An
assembly drawing for the Evaluation Board is shown in Figure 7
and the layer detail is provided in Figure 8. An Evaluation Board
schematic is shown in Figure 9. Table 4 provides the Bill of
Materials (BOM) list for Evaluation Board components.
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
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
The attenuation level of the SKY12230-12LF is controlled by
applying 0 to 3 V to the VCONTROL pin on the Evaluation Board (see
Figure 7).
The SKY12230-12LF 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 the Skyworks Application Note,
Solder Reflow Information, document number 200164.
Package Dimensions
The PCB layout footprint for the SKY12230-12LF is shown in
Figure 10. Typical part markings are shown in Figure 11. Package
dimensions for the 8-pin SOIC are shown in Figure 12, and tape
and reel dimensions are provided in Figure 13.
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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April 6, 2015 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 202532D
GND
VCONTROL
DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
RF_IN
RF_OUT
S3215
Figure 7. SKY12230-12LF Evaluation Board Assembly Diagram
Cross Section
Name
Thickness (in)
Material
Top Soldermask
L1
(0.0028)
Cu foil
0.012 ± 0.0006
Rogers RO4003C Core
L2
(0.0014)
Cu foil
Laminate
(Note 1)
FR4 Prepreg
L3
(0.0014)
Cu foil
0.010 ± 0.0006
FR4 Core
(0.0028)
Cu foil
Laminate
Laminate
L4
Bottom Soldermask
Note 1: Adjust this thickness to meet total thickness goal of 0.062 ± 0.005 inches.
S2531
Figure 8. Layer Detail Physical Characteristics
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015
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DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
Control Voltage
R1
1.8 kΩ
C1
220 pF
L1
22 nH
C2
220 pF
8
1
I_CONTROL
I_CONTROL
7
2
GND
GND
GND
GND
6
3
5
4
C3
100 pF
L2
22 nH
RF_IN
RF Input
RF_OUT
C4
100 pF
RF Output
S3219a
Figure 9. SKY12230-12LF Evaluation Board Schematic
Table 4. SKY12230-12LF Evaluation Board Bill of Materials
Component
Value
Size
Manufacturer
Part Number
C1, C2
220 pF
0402
Murata
GRM1555C1H221J
C3, C4
100 pF
0402
Murata
GRM1555C1H101J
L1, L2
22 nH
0402
Coilcraft
0402CS-22NXJLU
R1
1.8 kΩ
0402
Panasonic
ERJ-2GEJ182X
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
0.1630
0.0200 Diam.
Via 4 Places
0.0555 Typ.
0.0190 Typ.
Dimensions are in inches
S3220
Figure 10. SKY12230-12LF PCB Layout Footprint
Skyworks Part #
Pin 1
Indicator
Date Code:
(YY = Calendar Year
WW = Week)
Figure 11. 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 • SKY12230-12LF: VARIABLE ATTENUATOR
Pin 8
0.050 (1.27 mm) BSC
0.244 (6.20 mm)
0.228 (5.80 mm)
Pin 1
Indicator
0.020 (0.51 mm) Max.
Pin 1
0.049
(1.24 mm)
0.016
(0.41 mm)
0.068
(1.73 mm) Max.
0.016 Max.
(0.41 mm) x
45° Chamfer
8°
Max.
0.158 (4.00 mm)
0.150 (3.80 mm)
0.010 (0.25 mm)
0.007 (0.17 mm)
0.197 (5.00 mm)
0.189 (4.80 mm)
0.010 (0.25 mm)
0.004 (0.10 mm)
Dimensions are in inches (millimeters shown in parentheses)
S3217
Figure 12. SKY12230-12LF 8-Pin SOIC Package Dimensions
4.00 ± 0.10
8.00 ± 0.10
Ø1.55 ± 0.05
1.75 ± 0.10
2.00 ± 0.05
Pin 1
A
A
12.00 ± 0.30
–0.10
5.49 ± 0.10 (Bo)
5° Max
5.50 ± 0.05
B
0.292 ± 0.13 (T)
B
1.68 ± 0.10 (Ko)
Ø1.50 +0.25
8° Max
6.88 ± 0.10 (Ao)
Notes:
1. Carrier tape must meet all requirements of Skyworks GP01-D232
procurement spec for tape and reel shipping.
2. Carrier tape material: black conductive polycarbonate or polystyrene.
3. Cover tape material: transparent conductive pressure sensitive adhesive (PSA)
material with 9.30 mm width.
4. ESD surface resistivity shall be less than 1 x 108 Ohms/Square per EIA, JEDEC
TNR specification.
5. All dimensions are in millimeters.
6. Part number US019881 (Please indicate on purchase order).
Figure 13. SKY12230-12LF Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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Y1848
DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
Ordering Information
Model Name
SKY12230-12LF: Variable Attenuator
Manufacturing Part Number
SKY12230-12LF
Evaluation Board Part Number
SKY12230-12LF-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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