SKY12232-21 Datasheet, PDF (2/10 Pages) Skyworks Solutions Inc. – High IIP3 2.65-3.65 GHz Voltage-Controlled Variable Attenuator

DATA SHEET • SKY12232-21 VARIABLE ATTENUATOR
Figure 2. SKY12232-21 Pinout – 8-Pin MCM
(Top View)
Table 1. SKY12232-21 Signal Descriptions
Pin #
Name
Description
Pin #
Name
1
GND
Ground. Must be connected to PCB ground
using lowest possible inductance path.
5
GND
2
V_CONTROL
Control voltage input (voltage applied is
nominally equal to the voltage applied to
pin 4)
6
J1
3
GND
Ground. Must be connected to PCB ground
using lowest possible inductance path.
7
GND
4
V_CONTROL
Control voltage input (voltage applied is
nominally equal to the voltage applied to
pin 2)
8
J2
Description
Ground. Must be connected to PCB ground
using lowest possible inductance path.
RF input/output
Ground. Must be connected to PCB ground
using lowest possible inductance path.
RF output/input
Technical Description
The SKY12232-21 is a 50 Ω matched voltage-controlled variable
attenuator with monotonic attenuation performance from 2.65 to
3.65 GHz over its entire control voltage range. This attenuator
requires no external biasing or RF matching components.
Monotonic performance means the attenuation increases as the
applied DC voltage increases. This attenuator is comprised of a
pair of matched PIN diodes that terminate two ports of an internal
90-degree hybrid coupler.
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 0 to 5 V and a 1.7 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
of the PIN diodes. Maximum attenuation occurs when the
resistance of the PIN diodes equals the characteristic impedance
of the hybrid coupler ports, which they terminate. This occurs at a
control voltage of approximately 5 VDC.
Electrical and Mechanical Specifications
The absolute maximum ratings of the SKY12232-21 are provided
in Table 2. Electrical specifications are provided in Table 3.
Performance characteristics for the SKY12232-21 are illustrated
in Figures 3 through 8.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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January 14, 2013 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 201930D