ALPHA AS118-12

GaAs IC High Isolation Positive
Control SPDT Switch DC–2.5 GHz
AS118-12
Features
SOIC-8
■ Positive Control
PIN 8
0.050 (1.27 mm) BSC
■ High Isolation (45 dB @ 0.9 GHz)
■ Low Insertion Loss (0.5 dB @ 0.9 GHz)
Description
The AS118-12 is a reflective SPDT FET IC switch. The
switch requires external DC blocking capacitors, positive
supply and two positive controls. The device is mounted
in a plastic SOIC-8 package for surface mounting and is
ideal for use in high isolation switching applications, such
as base station synthesizer switching.
0.244 (6.20 mm)
0.228 (5.80 mm)
PIN 1
INDICATOR
0.020 (0.51 mm) MAX.
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)
0.016 MAX.
(0.41 mm) x
45˚ CHAMFER
0.049
(1.24 mm)
0.016
(0.41 mm)
0.158 (4.00 mm)
0.150 (3.80 mm)
0.010 (0.25 mm)
0.007 (0.17 mm)
8˚
MAX.
Electrical Specifications at 25°C (0, +5 V)
Parameter1
Frequency2
Insertion Loss3
DC–0.5
DC–1.0
DC–2.0
DC–2.5
GHz
GHz
GHz
GHz
Isolation
DC–0.5
DC–1.0
DC–2.0
DC–2.5
GHz
GHz
GHz
GHz
VSWR4
DC–1.0 GHz
DC–2.0 GHz
DC–2.5 GHz
Min.
46
43
24
15
Typ.
Max.
Unit
0.55
0.6
0.7
0.9
0.65
0.7
0.8
1.1
dB
dB
dB
dB
50
46
27
18
dB
dB
dB
dB
1.2:1
1.4:1
1.6:1
1.4:1
1.7:1
2.1:1
Typ.
Max.
Operating Characteristics at 25°C (0, +5 V)
Parameter1
Switching Characteristics5
Condition
Frequency
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
Input Power for 1 dB Compression
Min.
Unit
60
100
50
ns
ns
mV
0.9 GHz
+26
dBm
0.9 GHz
+41
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +10 dBm
Control Voltages
VLow = 0 to 0.2 V @ 20 µA Max.
VHigh = +3 V @ 100 µA Max. to +5 V @ 200 µA Max.
VS = VHigh ± 0.2 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.
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
GaAs IC High Isolation Positive Control SPDT Switch DC–2.5 GHz
AS118-12
Typical Performance Data (0, +5 V)
1.1
70
1.0
60
0.9
dB
dB
50
0.8
40
85˚C
0.7
25˚C
0.6
30
0˚C
0.5
20
0
0.5
1.0
1.5
2.0
2.5
0
0.5
1.0
1.5
2.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
Isolation vs. Frequency
2.5
Absolute Maximum Ratings
1.6
Characteristic
1.5
RF Input Power
1 W Max. > 0.9 GHz
0/+5 V Control
1.4
1.3
1.2
1.1
Value
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
ΘJC
85°C/W
1.0
0
0.5
1.0
1.5
2.0
2.5
Frequency (GHz)
Pin Out
VSWR vs. Frequency
Insertion Loss
VHigh = +3 to +5 V (VS = VHigh ± 0.2 V).
J1
V2
5
Isolation
Isolation
V1
6
Insertion Loss
VHigh
7
0
0
8
VHigh
VS
J1–J3
4
J1–J2
3
V2
CBL
2
V1
1
GND
Truth Table
CBL
GND
DC blocking capacitors (CBL) must be supplied externally.
CBL = 100 pF for operation >500 MHz.
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
CBL
J3
J2