203556B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice February 9, 2017
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DATA SHEET • SKY12239-11: VOLTAGE-CONTROLLED VARIABLE ATTENUATOR
Table 1. SKY12239-11 Signal Descriptions
Pin
1
2
3
4
Name
RF_IN
V_SUPPLY
RF_OUT
V_CONTROL
Description
RF input, AC coupled.
No external components required.
Fixed reference supply, 2.7 V
DC
.
RF output, AC coupled.
No external components required.
Variable reference supply, 1.0 V to 5.0 V
DC
.
Pin
5
6
7
Name
L_OUT
L_IN
GND
Description
Phase compensation inductor output
Phase compensation inductor input
Paddle of the device. Ground to the Applications Board.
Provides thermal contact and RF ground.
Technical Description
The SKY12239-11 is a 50
Ω
matched voltage controlled variable
attenuator with monotonic attenuation performance from 10 MHz
to 1.5 GHz over its entire control voltage range. This attenuator
requires no external biasing or RF matching components.
Monotonic performance means the attenuation increases or
decreases as the applied DC voltage increases or decreases. This
attenuator is comprised of four matched PIN diodes that terminate
two ports of an internal matching network.
The diodes are biased using an external control voltage signal that
sets the bias current through a resistive network. The attenuator
operates with a control voltage range of 1 to 5 V and a 2 mA
typical control current at maximum attenuation. As the control
voltage increases, the bias current through each of the PIN diodes
also increases. This increased bias current lowers the resistance
Table 2. SKY12239-11 Absolute Maximum Ratings
1
Parameter
Control voltage
Reference voltage
RF input power (CW)
Control current
Thermal impedance (V
CTRL
= 5 V, V
SUPPLY
= 2.7 V, P
IN
= +21 dBm)
Storage temperature
Operating temperature
Electrostatic discharge:
Charged Device Model (CDM), Class 4
Human Body Model (HBM), Class 1B
Machine Model (MM), Class A
V
CT
R
L
V
SUPPLY
P
IN
I
CC
of the PIN diodes. Maximum attenuation occurs when the
resistance of the PIN diodes is at maxmimum (control voltage of
approximately 1 VDC).
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY12239-11 are provided
in Table 2. Electrical specifications are provided in Table 3.
Performance characteristics for the SKY12239-11 are illustrated
in Figures 3 through 8.
Symbol
Minimum
0
Maximum
5.5
5.5
1
50
+94
Units
V
V
W
mA
C/W
C
C
JC
T
STG
T
OP
ESD
–55
–40
+125
+105
1000
500
100
V
V
V
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.
ESD HANDLING:
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 when handling or transporting. Static charges may easily produce
potentials of several kilovolts on the human body or equipment, which can discharge without detection.
Industry-standard ESD handling precautions should be used at all times.
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