1.
鈮?/div>
39pF
C=100pF
Low Insertion Loss, 0.7 dB @ 2.4 GHz
1
High Isolation, 25 dB @ 2.4 GHz
1
Low Power Consumption, < 10 碌A @ +3 V
Low Cost Plastic SOT-363 Package
For best results at 2.4 GHz, use 8 pF 0402 profile SMT capaci-
tors on RF ports and 100 pF bypassing on pins 4 and 6.
V1
RFC
V2
V1
RFC
V2
Description
The SW-438 is a GaAs MMIC SPDT switch in a low cost
SOT-363 surface mount plastic package. Typical applica-
tions include transmit/receive switching for Bluetooth and
WLAN equipment. The SW-438 can also be used in applica-
tions up to 500 mW in systems such as cellular, PCS,
DCS1800, GSM, CDMA and other analog and digital wire-
less communications systems.
M/A-COM fabricates the SW-438 using a 0.5 micron gate
length GaAs p-HEMT process. The process features full pas-
sivation for increased performance and reliability.
RF1
GND
RF2
RF1
GND
RF2
PIN 1
2.4 GHz Application
C=8pF
C=8pF
PIN 1
Broad Band Applications
C
鈮?/div>
39pF
C
鈮?/div>
39pF
Pin Configuration
Pin No.
1
Function
RF1
GND
RF2
V2
RFC
V1
Description
RF Input/Output
RF Ground
RF Input/Output
Control 2 Input
RF Common Port
Control 1 Input
External Component Requirements
Please note the values of the external capacitors. The ca-
pacitors at each of the RF ports are used as for achieving
optimum insertion loss. They also provide DC blocking for
positive control. The 8 pF (0402) capacitor is recom-
mended for 2 - 3 GHz operation. If this value is changed or
the capacitor placed too far from the switch, the perform-
ance will be affected. We also recommend 100 pF bypass
capacitors on pins 4 and 6.
For broadband applications with positive control voltages,
use DC blocking capacitors with value of 39 pF or more
.
2
3
4
5
6
Ordering Information
Part Number
SW-438TR-3000
SW-438SMB
Package
SW-438 on 13 Inch, 3000 piece Reel
SW-438 sample test board
Truth Table
Mode
(Control)
Positive
1
Negative
2
0 + 0.2V
+2.3 to +5V
0 + 0.2V
-2.3 to +5V
+2.3 to +5V
0 + 0.2V
-2.3 to +5V
0 + 0.2V
Off
On
On
Off
On
Off
Off
On
V1
V2
RFC-RF1
RFC-RF2
1.
2.
External DC blocking capacitors are required on all RF ports.
If negative control is used, DC blocking capacitors are not required on RF ports.
1
2
3
4
