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GaAs IC 25 dB Voltage Variable Attenuator
Single Positive Control 0.5–2.5 GHz
Features
s Single Positive +5 V Control Voltage
s 25 dB Attenuation Range @ 0.9 GHz
s High IP3 (20 dBm @ 0.9 GHz)
s Excellent Linearity Performance
Description
The AV104-12 GaAs IC FET voltage variable attenuator
provides 25 dB attenuation range at 900 MHz controlled
by a single positive voltage. The VVA has a linear transfer
curve of 5 dB/V slope, with input and output VSWR better
than 1.4:1 over all states. Its attenuation range at 1900
MHz is 22 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.
SOIC-8
PIN 8
PIN 1
INDICATOR
PIN 1
0.068
(1.73 mm) MAX.
0.197 (5.00 mm)
0.189 (4.80 mm)
0.010 (0.25 mm)
0.004 (0.10 mm)
Preliminary
AV104-12
0.050 (1.27 mm) BSC
0.244 (6.20 mm)
0.228 (5.80 mm)
0.020 (0.51 mm) MAX.
0.049
(1.24 mm)
0.016
(0.41 mm)
0.016 MAX.
(0.41 mm) x
45˚ CHAMFER
MAX.
0.158 (4.00 mm)
0.150 (3.80 mm)
0.010 (0.25 mm)
0.007 (0.17 mm)
Electrical Specifications at 25°C (VS = 5 V)
Parameter1
Insertion Loss (VC = 5 V)
Maximum Attenuation (VC = 0 V)2
VSWR (I/O)3
Frequency
0.5–1.0 GHz
1.0–2.0 GHz
2.0–2.5 GHz
0.5–0.8 GHz
0.8–1.0 GHz
1.0–1.7 GHz
1.7–2.0 GHz
2.0–2.5 GHz
0.5–2.5 GHz
Min.
16
21
19
17
15
Typ.
2.7
3.0
3.2
20
25
23
21
19
1.4:1
Max.
3.0
3.4
3.7
Unit
dB
dB
dB
dB
dB
dB
dB
dB
Operating Characteristics at 25°C (VS = 5 V)
Parameter
Switching Characteristics
Intermodulation Intercept Point (IIP3)3
Condition
Rise, On (10/90% or 50% CTL to 90% RF)
Fall, Off (90/10% RF or 50% CTL to 10% RF)
For Two-tone Input Power +0 dBm
Frequency
0.9 GHz
Min.
Typ.
1.0
1.5
20
Max.
Unit
µS
µS
dBm
Control Voltage (VC)
Supply Voltage (VS)
Control Current (IC)
Supply Current (IS)
1. All measurements made in a 50 system, unless otherwise specified.
2. Maximum attenuation includes insertion loss.
3. For worst case state.
0.0 VS
5.0
V
V
2.5 mA
2.5 µA
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
1

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GaAs IC 25 dB Voltage Variable Attenuator Single Positive Control 0.5–2.5 GHz
AV104-12
Typical Performance Data @ 0.9 GHz
(Unless Otherwise Specified)
0
-1
-2
-3
-4
-5
0.5 1.0 1.5 2.0 2.5
Frequency (GHz)
Insertion Loss vs. Frequency
1.5
1.4
1.3
1.2
Input
1.1
Output
1
0 1 2 34
VC (V)
VSWR vs. Control Voltage
5
0
-5
-10
-15
-20
-25
-30
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VC (V)
Attenuation vs. Control Voltage
40
35
30
25
20
15
10
5
0
0 1 2 34 5
VC (V)
Input IP3 vs. Control Voltage
1.5
Attenuation Normalized to 25˚C
1.0
0.5 85˚C
0
-0.5
-20˚C
-1.0
-1.5
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VC (V)
Attenuation vs. Control Voltage
Over Temperature
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

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GaAs IC 25 dB Voltage Variable Attenuator Single Positive Control 0.5–2.5 GHz
Absolute Maximum Ratings
Characteristic
Value
RF Input Power
100 mW > 500 MHz
Supply Voltage
+4 to +8 V
Control Voltage
Operating Temperature
-0.2 V < VC < VS +0.2 V
-40°C to +85°C
Storage Temperature
-65°C to +150°C
ΘJC 25°C/W
Note: Exceeding these parameters may cause irreversible damage.
Pin Out
GND
GND
J1
CBL
VS
DC blocking capacitors (CBL) supplied externally.
CBL = 25 pF for operation >500 MHz.
AV104-12
GND
J2
CBL
GND
VC
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
3