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
1
SKY12146-321: GaAs IC 25 dB Voltage
Variable Attenuator 2.74.0 GHz
PRELIMINARY DATA SHEET
Features
Power control for 3.5 GHz fixed wireless applications
Minimum 25 dB attenuation
Positive 0.21.2 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 2.74.0 GHz, the SKY12146-321 is ideal for low
cost applications such as 3.5 GHz fixed wireless LAN power
control applications.
Parameter
Frequency
Min.
Typ.
Max.
Unit
Insertion loss (V
C
= 1.2 V)
2.74.0 GHz
1.5
1.8
dB
Maximum attenuation (V
C
= 0.2 V)
2.74.0 GHz
22
25
dB
VSWR -- all ports
2.74.0 GHz
1.5
1.8
Electrical Specifications at 25 C
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
Switching characteristics
Rise, fall (10/90% or 90/10% RF)
80
50
ns
On, off (50% CTL to 90/10% RF)
150
ns
Video feedthru
25
mV
Maximum input power
2.74.0 GHz
13
dBm
for < 1 dB attenuation variation
Input 3rd order intercept point (IIP3)
2.74.0 GHz
20
dBm
Control voltage
0.2
1.2
V
Operating Characteristics at 25 C (0, +1.2 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. For worst case state.
Characteristic
Value
RF input power
1 W max.
Control voltage
-0.2 V, +6 V
Operating temperature
-40 C to +85 C
Storage temperature
-65 C to +150 C
Absolute Maximum Ratings
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
April 27, 2004 Skyworks Proprietary Information. Products and product information are subject to change without notice.
PRELIMINARY DATA SHEET SKY12146-321
2
Typical Performance Data at 25 C
Frequency (GHz)
Insertion Loss (dB)
Insertion Loss vs. Frequency
2.8
3.0
3.2
3.4
3.6
3.8
4.0
-2.0
-1.9
-1.8
-1.7
-1.6
-1.5
-1.4
-1.3
-1.2
-1.1
-1.0
Maximum Attenuation vs. Frequency
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
2.8
3.0
3.2
3.4
3.6
3.8
4.0
Frequency (GHz)
Attenuation (dB)
0.2 V
0 V
Attenuation vs. Control Voltage
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
0
0.2
0.4
0.6
0.8
1.0
1.2
Control Voltage (V)
Attenuation (dB)
Input Return Loss vs. Frequency
2.8
3.0
3.2
3.4
3.6
3.8
4.0
Frequency (GHz)
Return Loss (dB)
-30
-25
-20
-15
-10
-5
0
Minimum Attenuation
Maximum Attenuation
Output Return Loss vs. Frequency
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
2.8
3.0
3.2
3.4
3.6
3.8
4.0
Frequency (GHz)
Return Loss (dB)
Minimum Attenuation
Maximum Attenuation
Frequency (GHz)
IIP3 (dBm)
Input IP3 vs. Frequency
2.8
3.0
3.2
3.4
3.6
3.8
4.0
18
19
20
21
22
PRELIMINARY DATA SHEET SKY12146-321
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
J
1
N/C
N/C
N/C
N/C
V
C
N/C
J
2
N/C
N/C
N/C
12
11
10
4
3
2
1
7
8
9
5
6
N/C
Pin Out
Ground is connected to paddle on bottom.
VVA Test Board
SK39506
Evaluation Board Layout
QFN-12
0.008 (0.20 mm)
Seating Plane
0.118 (3.00 mm)
Pin 1 Indicator
Pin 1
Indicator
0.118
(3.00 mm)
0.001
(0.02 mm)
0.030
(0.75 mm)
0.002
(0.05 mm)
Exposed pad
0.029
(0.73 mm)
0.017
(0.435 mm) SQ.
0.007
(0.180 mm)
0.0196
(0.50 mm) BSC
0.057 (1.45 mm) SQ.
+ 0.004 (0.10 mm)
- 0.006 (0.15 mm)
0.022 (0.55 mm)
0.004 (0.10 mm)
0.009 (0.23 mm)
+ 0.003 (0.07 mm)
- 0.002 (0.05 mm)
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