DATA SHEET
SKY12230-12LF: High IIP3, 1.7 to 2.3 GHz Variable Attenuator
Applications
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
Control
Current
Control
Current
Features
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
SOIC (8-pin, 6.0 x 4.9 mm) package
(MSL3, 260
C
per JEDEC J-STD-020)
RF
In/Out
RF
In/Out
Figure 1. SKY12230-12LF Block Diagram
Skyworks Green
TM
products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to
Skyworks
Definition of Green
TM
, document number
SQ04–0074.
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 • sales@skyworksinc.com • www.skyworksinc.com
202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2014
1
S3206
DATA SHEET • SKY12230-12LF: VARIABLE ATTENUATOR
I_CONTROL
8
7
6
1
2
3
GND
GND
Pin
5
6
7
8
I_CONTROL
Figure 2. SKY12230-12LF Pinout – 8-Pin SOIC
(Top View)
Table 1. SKY12230-12LF Signal Descriptions
Pin
1
2
3
4
Name
I_CONTROL
GND
GND
RF_IN
Description
Control current input (current applied is
nominally equal to the current applied to pin 8)
Ground. Must be connected to PCB ground using
lowest possible inductance path.
Ground. Must be connected to PCB ground using
lowest possible inductance path.
RF input. Input and output are interchangeable.
Name
RF_OUT
GND
GND
I_CONTROL
Description
RF output. Input and output are
interchangeable.
Ground. Must be connected to PCB ground
using lowest possible inductance path.
Ground. Must be connected to PCB ground
using lowest possible inductance path.
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
RF_IN
S3218
RF_OUT
5
4
GND
GND
V
CONTROL
0.7
1800
Approximately 50 percent of the control current (I
CONTROL
) flows
equally through each diode. The forward voltages are very well
matched since both diodes are manufactured on a single die. The
control voltage (V
CONTROL
) 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 • sales@skyworksinc.com • www.skyworksinc.com
2
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
The absolute maximum ratings of the SKY12230-12LF are
provided in Table 2. Electrical specifications are provided in
Table 3.
Performance characteristics for the SKY12230-12LF are
illustrated in Figures 3 through 6.
Table 2. SKY12230-12LF Absolute Maximum Ratings (Note 1)
Parameter
Reverse diode voltage
RF input power:
CW
@ 12.5% duty cycle
Control current
Storage temperature
Operating temperature
V
REVERSE
P
IN
0.5
4.0
I
CONTROL
T
STG
T
OP
–65
–40
50
+125
+85
W
W
mA
C
C
Symbol
Minimum
Maximum
10
Units
V
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)
(T
OP
= +25
C,
I
CONTROL
= 0 to 1.3 mA, P
IN
= 0 dBm, Characteristic Impedance [Z
O
] = 50
Ω,
Unless Otherwise Noted)
Parameter
Insertion loss
Attenuation
Return loss
Third order input intercept point
IL
Attn
RL
IIP3
Symbol
Test Condition
I
CONTROL
= 0 mA,
f = 1.7 to 2.3 GHz
I
CONTROL
= 1.3 mA,
f = 2.15 GHz
I
CONTROL
= 0 mA,
f = 1.7 to 2.3 GHz
P
IN
= 0 dBm each tone,
I
CONTROL
= 0 mA,
spacing = 10 MHz,
f = 1.7 to 2.3 GHz
10/90% or 90/10% of RF
50% V
CONTROL
to 90/10%
of RF
18.5
9.5
22.0
Min
Typical
1.3
Max
1.5
39.0
Units
dB
dB
dB
+53
3
1
dBm
μs
μs
Switching characteristics:
Rise, fall time
On, off time
t
RISE
, t
FALL
t
ON
, t
OFF
Note 1:
Performance is guaranteed only under the conditions listed in this table.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015
3
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
–5
238
μA
0
μA
760
μA
1357
μA
–10
–15
Insertion Loss (dB)
Return Loss (dB)
–10
–15
–20
–25
–30
–35
–40
1.7
1.8
1.9
1411
μA
1464
μA
1301
μA
–20
–25
–30
–35
–40
1.7
0V
1.0 V
2.0 V
3.0 V
3.1 V
3.2 V
3.3 V
3.4 V
3.5 V
3.6 V
0V
1V
2V
3V
3.1 V
3.2 V
3.3 V
2.0
2.1
2.2
2.3
1.8
1.9
2.0
2.1
2.2
2.3
Frequency (GHz)
Frequency (GHz)
Figure 3. Insertion Loss vs Frequency vs Control Voltage
Figure 4. Return Loss vs Frequency vs Control Voltage
+60
+55
+50
1.7
GHz
2.0
GHz
2.2
GHz
0
–5
–10
1.7
GHz
2.0
GHz
2.3
GHz
Attenuation (dB)
IIIP3 (dBm)
+45
+40
+35
+30
+25
+20
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
–15
–20
–25
–30
–35
–40
–45
0
200
400
600
800
1000
1200
1400
1600
1800
Control
Voltage (V)
Control Current
(μA)
Figure 5. IIP3 vs Control Voltage vs Frequency
(P
IN
= 0 dBm, Spacing = 10 MHz)
Figure 6. Attenuation vs Control Current vs Frequency
Evaluation Board Description
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.
The attenuation level of the SKY12230-12LF is controlled by
applying 0 to 3 V to the V
CONTROL
pin on the Evaluation Board (see
Figure 7).
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
related to moisture absorption may occur when the part is
subjected to high temperature during solder assembly.
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.
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.
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
4
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
V
CONTROL
RF_IN
GND
RF_OUT
S3215
Figure 7. SKY12230-12LF Evaluation Board Assembly Diagram
Cross Section
Name
Thickness (in)
Material
Top
Soldermask
L1
Laminate
L2
Laminate
L3
Laminate
L4
Bottom
Soldermask
Note 1: Adjust this thickness to meet total thickness goal of 0.062 ± 0.005 inches.
S2531
(0.0028)
0.012 ± 0.0006
(0.0014)
(Note 1)
(0.0014)
0.010 ± 0.0006
(0.0028)
Cu
foil
Rogers RO4003C
Core
Cu
foil
FR4 Prepreg
Cu
foil
FR4
Core
Cu
foil
Figure 8. Layer Detail Physical Characteristics
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
202532D • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • April 6, 2015
5
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