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PRELIMINARY DATA SHEET
SKY12146-321: GaAs IC 25 dB Voltage Variable Attenuator 2.7-4.0 GHz
Features
Power control for 3.5 GHz fixed wireless applications Minimum 25 dB attenuation Positive 0.2-1.2 V control voltage QFN-12 3 x 3 mm package Low cost No external components needed

Description
The SKY12146-321 is a GaAs IC PHEMT voltage variable attenuator that has been designed for WLAN applications. Operating from 2.7-4.0 GHz, the SKY12146-321 is ideal for low cost applications such as 3.5 GHz fixed wireless LAN power control applications.
Absolute Maximum Ratings
Characteristic RF input power Control voltage Operating temperature Storage temperature Value 1 W max. -0.2 V, +6 V -40 C to +85 C -65 C to +150 C
1. All measurements made in a 50 system, unless otherwise specified. 2. For worst case state.
Electrical Specifications at 25 C
Parameter Insertion loss (VC = 1.2 V) Maximum attenuation (VC = 0.2 V) VSWR -- all ports Frequency 2.7-4.0 GHz 2.7-4.0 GHz 2.7-4.0 GHz 22 Min. Typ. 1.5 25 1.5 1.8 Max. 1.8 Unit dB dB
Operating Characteristics at 25 C (0, +1.2 V)
Parameter Switching characteristics Condition Rise, fall (10/90% or 90/10% RF) On, off (50% CTL to 90/10% RF) Video feedthru 2.7-4.0 GHz 2.7-4.0 GHz 0.2 Frequency Min. 80 Typ. 50 150 25 13 20 1.2 Max. Unit ns ns mV dBm dBm V
Maximum input power for < 1 dB attenuation variation Input 3rd order intercept point (IIP3) Control voltage
1. All measurements made in a 50 system, unless otherwise specified. 2. For worst case state.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
Skyworks Proprietary Information. * Products and product information are subject to change without notice. * April 27, 2004
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PRELIMINARY DATA SHEET * SKY12146-321
Typical Performance Data at 25 C
-1.0 -1.1 -1.2 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 2.8 3.0 3.2 3.4 3.6 3.8 4.0 2.8 3.0 3.2 3.4 3.6 3.8 4.0 0V 0.2 V
Insertion Loss (dB)
-1.4 -1.5 -1.6 -1.7 -1.8 -1.9 -2.0
Frequency (GHz)
Attenuation (dB)
-1.3
Frequency (GHz)
Insertion Loss vs. Frequency
0 -5 -10 -5 0
Maximum Attenuation vs. Frequency
Attenuation (dB)
Return Loss (dB)
-15 -20 -25 -30 -35 -40 -45 -50 0 0.2 0.4 0.6 0.8 1.0 1.2
-10 Minimum Attenuation -15 -20 -25 -30 2.8 Maximum Attenuation
3.0
3.2
3.4
3.6
3.8
4.0
Control Voltage (V)
Frequency (GHz)
Attenuation vs. Control Voltage
0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 2.8 3.0 3.2 3.4 3.6 3.8 4.0 18 2.8 Maximum Attenuation Minimum Attenuation 21 22
Input Return Loss vs. Frequency
Return Loss (dB)
IIP3 (dBm)
20
19
3.0
3.2
3.4
3.6
3.8
4.0
Frequency (GHz)
Frequency (GHz)
Output Return Loss vs. Frequency
Input IP3 vs. Frequency
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com 2
April 27, 2004 * Skyworks Proprietary Information. * Products and product information are subject to change without notice.
PRELIMINARY DATA SHEET * SKY12146-321
Pin Out
N/C N/C
12 11 10
Evaluation Board Layout
N/C
J1 N/C N/C
1 2 3
9 8 7
J2 N/C N/C
SK39506 VVA Test Board
4
5
N/C
Ground is connected to paddle on bottom.
QFN-12
0.118 (3.00 mm) Pin 1 Indicator 0.118 (3.00 mm) 0.008 (0.20 mm) Seating Plane 0.001 (0.02 mm)
VC
N/C
6
0.029 (0.73 mm) Exposed pad 0.009 (0.23 mm) + 0.003 (0.07 mm) - 0.002 (0.05 mm)
0.007 (0.180 mm)
0.030 (0.75 mm) 0.002 (0.05 mm) 0.017 (0.435 mm) SQ. Pin 1 Indicator 0.057 (1.45 mm) SQ. + 0.004 (0.10 mm) - 0.006 (0.15 mm)
0.0196 (0.50 mm) BSC
0.022 (0.55 mm) 0.004 (0.10 mm)
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
Skyworks Proprietary Information. * Products and product information are subject to change without notice. * April 27, 2004
3

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