ALPHA AS118-12 Datasheet
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
1
Condition Frequency Min. Typ. Max. Unit
Switching Characteristics
5
Rise, Fall (10/90% or 90/10% RF) 60 ns
On, Off (50% CTL to 90/10% RF) 100 ns
Video Feedthru 50 mV
Input Power for 1 dB Compression 0.9 GHz +26 dBm
Intermodulation Intercept Point (IP3) For Two-tone Input Power +10 dBm 0.9 GHz +41 dBm
Control Voltages V
Low
= 0 to 0.2 V @ 20 µA Max.
V
High
= +3 V @ 100 µA Max.to +5 V @ 200 µA Max.
VS= V
High
± 0.2 V
GaAs IC High Isolation Positive
Control SPDT Switch DC–2.5 GHz
Features
■ Positive Control
■ High Isolation (45 dB @ 0.9 GHz)
■ Low Insertion Loss (0.5 dB @ 0.9 GHz)
SOIC-8
AS118-12
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 AS118-12 is a reflective SPDT FET IC switch.The
switch requires external DC bloc king capacitors, positiv e
supply and two positive controls.The device is mounted
in a plastic SOIC-8 package for surf ace mounting and is
ideal for use in high isolation switching applications , such
as base station synthesizer switching.
Parameter
1
Frequency
2
Min. Typ. Max. Unit
Insertion Loss
3
DC–0.5 GHz 0.55 0.65 dB
DC–1.0 GHz 0.6 0.7 dB
DC–2.0 GHz 0.7 0.8 dB
DC–2.5 GHz 0.9 1.1 dB
Isolation DC–0.5 GHz 46 50 dB
DC–1.0 GHz 43 46 dB
DC–2.0 GHz 24 27 dB
DC–2.5 GHz 15 18 dB
VSWR
4
DC–1.0 GHz 1.2:1 1.4:1
DC–2.0 GHz 1.4:1 1.7:1
DC–2.5 GHz 1.6:1 2.1:1
Electrical Specifications at 25°C (0, +5 V)
Operating Characteristics at 25°C (0, +5 V)
1.All measurements made in a 50 Ω system, unless otherwise specified.
2. DC = 300 kHz.
3. Insertion loss changes by 0.003 dB/°C.
4. Insertion loss state.
5.Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
GaAs IC High Isolation Positive Control SPDT Switch DC–2.5 GHz AS118-12
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
0.5
0 0.5 1.0 1.5 2.0 2.5
0.6
0.7
0.8
0.9
1.0
1.1
Insertion Loss vs. Frequency
Frequency (GHz)
85˚C
25 ˚C
0˚C
dB
VSWR vs. Frequency
1.0
0 0.5 1.0 1.5 2.0 2.5
1.1
1.2
1.3
1.4
1.5
1.6
Frequency (GHz)
20
0 0.5 1.0 1.5 2.0 2.5
30
40
50
60
70
Isolation vs. Frequency
Frequency (GHz)
dB
Typical Performance Data (0, +5 V)
V
S
C
BL
C
BL
J
2
J
1
V
1
V
2
GND
GND
J
3
C
BL
1 2 3 4
8 7 6 5
Characteristic Value
RF Input Power 1 W Max.> 0.9 GHz
0/+5 V Control
Supply Voltage +8 V
Control Voltage -0.2 V, +8 V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
Θ
JC
85°C/W
Absolute Maximum Ratings
Pin Out
V
High
= +3 to +5 V (VS= V
High
± 0.2 V).
V
1
V
2
J1–J
2
J1–J
3
V
High
0 Insertion Loss Isolation
0 V
High
Isolation Insertion Loss
Truth Table
DC blocking capacitors (CBL) must be supplied externally.
C
BL
= 100 pF for operation >500 MHz.
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