Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
1
Specifications subject to change without notice. 3/99A
GaAs 35 dB IC Voltage Variable Single
Control Attenuator 0.42.5 GHz
Features
s
Single Positive Control Voltage
s
35 dB Attenuation Range
s
8 Lead Hermetic Surface Mount Package
s
Capable of Meeting MIL-STD
Requirements
5
-11
AT002S3-11
Description
The AT002S3-11 is a GaAs IC FET absorptive bridged "T"
attenuator. This attenuator operates from 0.42.5 GHz and
provides up to 35 dB of attenuation. The key feature of this
attenuator is the requirement of only one "positive" control
voltage. Blocking capacitors are required on the RF ports.
0.180 (4.57 mm)
SQ. MAX.
0.400 (10.16 mm)
0.380 (9.65 mm)
0.150
(3.81 mm)
0.050
(1.27 mm)
TYP.
ORIENTATION
MARK
0.017 (0.43 mm)
0.013 (0.33 mm)
0.006 (0.15 mm)
0.004 (0.10 mm)
0.250 (6.35 mm)
0.200 (5.08 mm)
0.070 (1.78 mm)
0.040 (1.02 mm)
0.075
(1.91 mm)
MAX.
1. All measurements made in a 50
system, unless otherwise specified.
2. Insertion loss changes by 0.003 dB/C.
3. For all attenuation levels.
4. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
5. See Quality/Reliability section.
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
Switching Characteristics
Rise, Fall (10/90% or 90/10% RF)
0.5
s
On, Off (50% CTL to 90/10% RF)
1.0
s
Video Feedthru
4
20
mV
Attenuation Flatness
010 dB
0.42.5 GHz
1.0
dB
1120 dB
1.5
dB
2130 dB
3.0
dB
31Max.
4.0
dB
Input Power for 1 dB Compression
For All Attenuation Levels
0.9 GHz
-3
dBm
Control Voltages
V
Low
= 0 to -0.2 V @ 25
A Max.
V
High
= 5 V @ 100
A Typ.
Supply Voltages (V
S
)
5 V @ 100
A Max.
Operating Characteristics at 25C
Parameter
1
Frequency
Min.
Typ.
Max.
Unit
Insertion Loss (V
1
= 5 V)
2
0.41.0 GHz
1.5
1.7
dB
1.02.0 GHz
1.7
2.0
dB
1.02.5 GHz
2.2
2.5
dB
Attenuation Range (V
1
= 0)
0.41.0 GHz
30
35
dB
1.02.5 GHz
33
38
dB
VSWR (I/O)
3
0.42.5 GHz
2.2:1
2.5:1
Electrical Specifications at 25C
GaAs 35 dB IC Voltage Variable Single Control Attenuator 0.42.5 GHz
AT002S3-11
2
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
Specifications subject to change without notice. 3/99A
Insertion Loss vs. Frequency
Frequency (GHz)
0.4
0.4
0.8
1.2
2.0
2.4
1.6
2.8
0.8
1.2
1.6
2.0
I
n
s
e
r
t
i
o
n
L
o
s
s
(
d
B
)
2.4
+85C
-55C
Relative Attenuation vs. Control Voltages
Attenuation (dB)
0
0
5
10
25
30
15
20
35
1
2
3
4
V
1
(
V
)
5
F = 1 GHz
Attenuation (By State) vs. Frequency
Frequency (GHz)
5
0.4
0.8
1.2
2.0
2.4
1.6
2.8
10
15
20
25
A
t
t
e
n
u
a
t
i
o
n
(
d
B
)
30
4.5 dB
3.5 dB
2.5 dB
0.8 dB
1.5 dB
0.5 dB
V
1
= 2.24
V
1
= 2.43
V
1
= 2.80
V
1
= 2.96
V
1
= 3.14
V
1
= 2.62
Typical Performance Data
Pin Out
J
1
GND
GND
5 V
V
1
GND
GND
J
2
Characteristic
Value
RF Input Power (RF In)
5 mW > 500 MHz
Bias Voltage (V
B
)
8 V
Control Voltage (V
C
)
8 V
Operating Temperature (T
OP
)
-55C to +125C
Storage Temperature (T
ST
)
-65C to +150C
Thermal Resistance (
JC
)
25C/W
Absolute Maximum Ratings
Do not allow control voltage V
1
to exceed supply voltage (V
S
).
Note: Blocking capacitors required at J
1
and J
2
.
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