Skyworks Solutions, Inc. [978] 241-7000
Fax [978] 241-7906 Email sales@skyworksinc.com www.skyworksinc.com
1
Specifications subject to change without notice. 10/99A
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
Input Power for 1 dB Compression
@ +3 V
1.9 GHz
+32
dBm
@ +5 V
1.9 GHz
+37
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +10 dBm
1.9 GHz
+55
dBm
Control Voltages
V
Low
= 0 to 0.2 V @ 20 A Max.
V
High =
+3 V @ 100 A Max. to +5 V @ 200 A Max.
V
S
= V
High
0.2 V
GaAs IC High Power Positive Control
SPDT Switch DC3 GHz
Features
High Linearity (IP3 55 dBm @ 1.9 GHz)
High Isolation (30 dB @ 1.9 GHz)
Low Insertion Loss (0.55 dB @ 1.9 GHz)
Positive 3 V to 5 V Control Voltage
Low DC Power Consumption
SOIC-8
AS278-12
Description
The AS278-12 is an IC FET SPDT switch in a SOIC-8
plastic package. The AS278-12 has been designed for use
where extremely high linearity and low insertion loss are
required. It is controlled with positive voltage eliminating
the need for negative voltage. Some standard
implementations include antenna changeover, T/R and
diversity switching over 2 W. The AS278-12 switch can be
used in many analog and digital wireless communication
systems.
Parameter
1
Frequency
2
Min.
Typ.
Max.
Unit
Insertion Loss
3
DC1.0 GHz
0.45
0.55
dB
1.02.0 GHz
0.6
0.75
dB
2.03.0 GHz
0.9
1.2
dB
Isolation
DC1.0 GHz
20
23
dB
1.01.8 GHz
22
25
dB
1.82.1 GHz
27
31
dB
2.13.0 GHz
10
12
dB
VSWR
4
DC1.0 GHz
1.2:1
1.3:1
DC2.0 GHz
1.3:1
1.4:1
DC3.0 GHz
1.7:1
1.8:1
Electrical Specifications at 25C (0, +5 V)
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
Operating Characteristics at 25C (0, +5 V)
1. All measurements made in a 50
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.
2
Skyworks Solutions, Inc. [978] 241-7000
Fax [978] 241-7906 Email sales@skyworksinc.com www.skyworksinc.com
Specifications subject to change without notice. 10/99A
GaAs IC High Power Positive Control SPDT Switch DC3 GHz
AS278-12
25C
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Frequency (GHz)
Insertion Loss vs. Frequency
85C
0C
DC
1
2
3
Insertion Loss (dB)
1.1
1.2
1.3
1.4
1.5
1.6
1.7
Frequency (GHz)
VSWR vs. Frequency
DC
1
2
3
VSWR
10
15
20
25
30
35
40
Frequency (GHz)
Isolation vs. Frequency
DC
1
2
3
Isolation (dB)
Typical Performance Data (0, +5 V)
C
BL
J
1
V
S
GND
GND
C
BL
J
2
V
1
V
2
J
3
C
BL
12
3
4
87
6
5
Characteristic
Value
RF Input Power
6 W Max. > 900 MHz,
0/+5 V Control
Supply Voltage
+8 V
Control Voltage
-0.2 V, +8 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
JC
85C/W
Absolute Maximum Ratings
Truth Table
Pin Out
V
High
= +3 to +5 V (V
S
= V
High
0.2 V).
DC block capacitors C
BL
must be supplied externally.
C
BL
= 100 pF for operation >500 MHz.
V
1
V
2
J
1
J
2
J
1
J
3
V
High
0
Isolation
Insertion Loss
0
V
High
Insertion Loss
Isolation
PDF 
ZIP