ALPHA AS148-24 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 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
Intermodulation Intercept Point (IP3) Two-tone Input Power +10 dBm 0.5–2.0 GHz +41 dBm
Control Voltages V
Low
= 0 to 0.2 V @ 20 µA Max.
V
High
= +5 V @ 200 µA Max.to +7 V @ 500 µA Max.
VS = V
High
± 0.2 V
GaAs IC High Isolation Positive Control
SPDT Switch DC–2.5 GHz
Features
■ Positive Voltage Control
■ High Isolation (50 dB @ 0.9 GHz
and 1.9 GHz)
■ Low DC Power Consumption
■ Base Station Synthesizer Switch
SOIC-14
AS148-24
Description
GaAs FET IC SPDT switch packaged in an SOIC-14
plastic package for low cost commercial applications .Ideal
building block for base station dual band applications
where synthesizer isolation is critical.Use in conjunction
with the AS123-12 SPST switch to meet GSM synthesizer
isolation requirement.
Parameter
1
Frequency
2
Min. Typ. Max. Unit
Insertion Loss
3
DC–1.0 GHz 0.6 0.9 dB
DC–2.0 GHz 0.8 1.1 dB
DC–2.5 GHz 1.2 1.4 dB
Isolation DC–1.0 GHz 44 50 dB
DC–2.0 GHz 45 50 dB
DC–2.5 GHz 32 42 dB
VSWR
4
DC–2.0 GHz 1.3:1 1.5:1
DC–2.5 GHz 1.5:1 1.8:1
Electrical Specifications at 25°C (0, +5 V)
PIN 14
0.050
(1.27 mm) BSC
PIN 1
PIN 1
INDICATOR
0.158 (4.01 mm)
0.150 (3.81 mm)
0.050 (1.27 mm)
0.016 (0.40 mm)
0.244
(6.20 mm)
0.228
(5.80 mm)
0.020 (0.51 mm)
0.013 (0.33 mm)
0.344 (8.75 mm)
0.337 (8.55 mm)
0.068
(1.73 mm) MAX.
0.010 (0.25 mm)
0.004 (0.10 mm)
0.158 (4.00 mm)
0.150 (3.80 mm)
0.049 (1.24 mm)
0.016 (0.41 mm)
0.016 MAX.
(0.41 mm)
x 45˚
CHAMFER
0.0098 (0.25 mm)
0.0075 (0.19 mm)
8˚ MAX.
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 AS148-24
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
Frequency (GHz)
1.5
1.25
1.0
0.75
0.5
DC .5 1.51.0 2.0 2.5
Insertion Loss vs. Frequency
dB
Frequency (GHz)
VSWR vs. Frequency
1.4
1.3
1.2
1.1
1.0
DC .5 1.51.0 2.0 2.5
Frequency (GHz)
Isolation vs. Frequency
dB
70
60
50
40
30
DC .5 1.51.0 2.0 2.5
Typical Performance Data (0, +5 V)
J
2
J
1
V
1
V
2
GND GND GND GND GND
GND GND GND
C
BL
C
BL
J
3
C
BL
V
S
1 2 3 4 5 6 7
14 13 12 11 10 9 8
Characteristic Value
RF Input Power 1 W Max.> 500 MHz
0/+8 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
25°C/W
Absolute Maximum Ratings
DC blocking capacitors (CBL) must be supplied externally.
C
BL
= 100 pF for operation >500 MHz.
V
1
V
2
J1–J
2
J1–J
3
V
High
0 Isolation Insertion Loss
0 V
High
Insertion Loss Isolation
Truth Table
Pin Out
V
High
= +5 to +7 V (VS= V
High
± 0.2 V).
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