GaAs IC High Isolation SPST Switch
Non-Reflective Positive Control 0.7–2 GHz
AS121-12
Features
s
Complementary Positive Control Voltages
s
5 V Operation
s
Input and Output Non-Reflective
s
High Isolation (46 dB @ 0.9 GHz)
PIN 1
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
PIN 1
INDICATOR
0.244 (6.20 mm)
0.228 (5.80 mm)
SOIC-8
PIN 8
0.050 (1.27 mm) BSC
Description
The AS121-12 SPST IC FET switch is non-reflective on
both input and output. This device has been designed for
high isolation switching applications and is mounted in the
SOIC-8 package. For positive operation, the switch
requires DC blocking capacitors on RF lines, a positive
supply and two complementary positive controls. Ideal
building block for base station switching applications.
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)
0.158 (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)
Parameter
1
Insertion Loss
2
Frequency
0.7–1.0 GHz
1.0–1.8 GHz
1.8–2.0 GHz
0.7–1.0 GHz
1.0–1.8 GHz
1.8–2.0 GHz
0.7–1.0 GHz
1.0–2.0 GHz
41
43
36
Min.
Typ.
0.8
1.0
1.1
46
47
40
1.6:1
1.4:1
1.8:1
1.6:1
Max.
1.0
1.2
1.3
Unit
dB
dB
dB
dB
dB
dB
Isolation
VSWR
3
Operating Characteristics at 25°C (0, +5 V)
Parameter
Switching Characteristics
4
Condition
Rise, Fall (10/90% or 90/10% RF)
On, Off (50% CTL to 90/10% RF)
Video Feedthru
+5 V
For Two-tone Input Power +13 dBm
+5 V
0.9 GHz
0.5–2.0 GHz
Frequency
Min.
Typ.
50
100
50
+28
+43
Max.
Unit
ns
ns
mV
dBm
dBm
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
V
Low
= 0 to 0.2 V @ 20 µA
V
High
= +5 V @ 100 µA to +7 V @ 200 µA Max.
V
S
= V
High
± 0.2 V
1. All measurements made in a 50
Ω
system, unless otherwise specified.
2. Insertion loss changes by 0.003 dB/°C.
3. Input/output.
4. 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 SPST Switch Non-Reflective Positive Control 0.7–2 GHz
AS121-12
Typical Performance Data (0, +5 V)
1.8
1.6
1.4
1.2
50
40
30
20
10
0
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
2.5
3.0
70
60
dB
0.8
0.6
0.4
0.2
0
dB
1.0
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
2.5
Isolation State
2.0
Isolation vs. Frequency
Absolute Maximum Ratings
Characteristic
RF Input Power
Control Voltage
Supply Voltage
Value
2 W Max. > 500 MHz,
0/+8 V
-0.2 V, +8 V
+8 V
-40°C to +125°C
-65°C to +150°C
25°C/W
1.5
Insertion Loss State
1.0
0
0.5
1.0
1.5
2.0
2.5
3.0
Operating Temperature
Storage Temperature
Θ
JC
Note: Exceeding these parameters may cause irreversible damage.
Frequency (GHz)
VSWR vs. Frequency
Pin Out
8
V
1
V
2
C
BL
GND
GND
J
2
Truth Table
Positive Operation
V
1
0
V
High
V
2
V
High
0
J
1
–J
3
Insertion Loss
Isolation
J
1
1
2
50
3
50
4
7
GND
6
5
V
High
= +5 to +7 V (V
S
= V
High
± 0.2 V).
C
BL
V
S
DC blocking capacitors (C
BL
) must be supplied externally.
C
BL
= 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
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