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
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
Switching Characteristics
Rise, On (10/90% or 50% CTL to 90% RF)
350
nS
Fall, Off (90/10% RF or 50% CTL to 10% RF)
250
nS
Intermodulation Intercept Point (IIP3)
3
For Two-tone Input Power +0 dBm
0.9 GHz
15
dBm
Control Voltage (V
C
)
0.0
V
S
V
Supply Voltage (V
S
)
5.0
V
Control Current (I
C
)
800
A
Supply Current (I
S
)
800
A
GaAs IC 35 dB Voltage Variable Attenuator
Single Positive Control 0.52.5 GHz
Features
s
Single Positive +5 V Control Voltage
s
35 dB Attenuation Range @ 0.9 GHz
s
Excellent Linearity Performance
SOIC-8
AV105-12
0.049
(1.24 mm)
0.016
(0.41 mm)
0.016 MAX.
(0.41 mm) x
45 CHAMFER
PIN 1
0.197 (5.00 mm)
0.189 (4.80 mm)
0.068
(1.73 mm) MAX.
0.010 (0.25 mm)
0.004 (0.10 mm)
0.010 (0.25 mm)
0.007 (0.17 mm)
0.158 (4.00 mm)
0.150 (3.80 mm)
8
MAX.
0.020 (0.51 mm) MAX.
0.244 (6.20 mm)
0.228 (5.80 mm)
0.050 (1.27 mm) BSC
PIN 8
PIN 1
INDICATOR
Description
The AV105-12 GaAs IC FET voltage variable attenuator
provides 35 dB attenuation range at 900 MHz controlled
by a single positive voltage. The VVA has a linear transfer
curve of 8 dB/V slope, with input and output VSWR better
than 1.4:1 over all states. Its attenuation range at 1900
MHz is 31 dB. It operates with supply voltage of +5 V and
control voltage of 0 V to +5 V in a low cost SOIC-8
package. The RF ports require 25 pF DC blocking
capacitors.
Parameter
1
Frequency
Min.
Typ.
Max.
Unit
Insertion Loss (V
C
= 5 V)
0.51.0 GHz
2.8
3.1
dB
1.02.0 GHz
3.2
3.6
dB
2.02.5 GHz
3.5
3.8
dB
Maximum Attenuation (V
C
= 0 V)
2
0.50.8 GHz
25
33
dB
0.81.0 GHz
35
38
dB
1.01.7 GHz
32
35
dB
1.72.0 GHz
28
31
dB
2.02.5 GHz
26
30
dB
VSWR (I/O)
3
0.52.5 GHz
1.8:1
Electrical Specifications at 25C (V
S
= 5 V)
Operating Characteristics at 25C (V
S
= 5 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. Maximum attenuation includes insertion loss.
3. For worst case state.
Preliminary
GaAs IC 35 dB Voltage Variable Attenuator Single Positive Control 0.52.5 GHz
AV105-12
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
0
-1
-2
-3
-4
2.5
2.0
Frequency (GHz)
Insertion Loss vs. Frequency
I
n
s
e
r
t
i
o
n
L
o
s
s
(
d
B
)
-5
0.5
1.0
1.5
4
5
3
V
C
(V)
Attenuation vs. Control Voltage
A
t
t
e
n
u
a
t
i
o
n
(
d
B
)
0
1
2
-40
-35
-30
-25
-20
-15
-10
-5
0
2.5
2.0
Frequency (GHz)
Maximum Attenuation vs. Frequency
M
a
x
i
m
u
m
A
t
t
e
n
u
a
t
i
o
n
(
d
B
)
0.5
1.0
1.5
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Typical Performance Data @ 0.9 GHz
(Unless Otherwise Specified)
4
5
3
V
C
(V)
VSWR vs. Control Voltage
V
S
W
R
0
1
2
1.00
1.10
1.20
1.30
1.40
1.50
Input
Output
40
30
15
10
20
4
5
3
V
C
(V)
Input IP3 vs. Control Voltage
I
I
P
3
(
d
B
m
)
0
0
1
2
35
25
5
4.0
5.0
3.0
V
C
(V)
Attenuation vs. Control Voltage
Over Temperature
A
t
t
e
n
u
a
t
i
o
n
(
d
B
)
0
1.0
2.0
-3.0
-2.0
-1.0
0
1.0
2.0
3.0
Attenuation Normalized to 25C
85C
-20C
GaAs IC 35 dB Voltage Variable Attenuator Single Positive Control 0.52.5 GHz
AV105-12
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579
Email sales@alphaind.com
www.alphaind.com
3
Specifications subject to change without notice. 3/99A
1
2
3
4
8
7
6
5
GND
GND
GND
V
S
J
1
V
C
J
2
GND
C
BL
C
BL
Characteristic
Value
RF Input Power
50 mW > 500 MHz
Supply Voltage
+4 to +8 V
Control Voltage
-0.2 V < V
C
< V
S
+0.2 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
JC
25C/W
Absolute Maximum Ratings
Pin Out
DC blocking capacitors (C
BL
) supplied externally.
C
BL
= 25 pF for operation >500 MHz.
Note: Exceeding these parameters may cause irreversible damage.
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