SW-438 Datasheet, PDF (1/4 Pages) Tyco Electronics – GaAs SPDT Switch DC. 3.0 GHz

GaAs SPDT Switch
V 1.00
DC– 3.0 GHz
Features
• Low Insertion Loss, 0.7 dB @ 2.4 GHz¹
• High Isolation, 25 dB @ 2.4 GHz¹
• Low Power Consumption, < 10 µA @ +3 V
• Low Cost Plastic SOT-363 Package
1. 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.
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.
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.
Truth Table
Functional Schematic
C=100pF
C=8pF
C=100pF
C=100pF
V1
RFC
V2
V1
C≥39pF
C=100pF
RFC
V2
RF1
GND
RF2
PIN 1
2.4 GHz Application
C=8pF
C=8pF
RF1
GND
RF2
PIN 1
Broad Band Applications
C≥39pF
C≥39pF
Pin Configuration
Pin No.
1
2
3
4
5
6
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
Ordering Information
Part Number
SW-438TR-3000
SW-438SMB
Package
SW-438 on 13 Inch, 3000 piece Reel
SW-438 sample test board
Mode
V1
(Control)
V2
RFC-RF1
Positive¹ 0 + 0.2V +2.3 to +5V
Off
+2.3 to +5V 0 + 0.2V
On
Negative ² 0 + 0.2V -2.3 to +5V
On
-2.3 to +5V 0 + 0.2V
Off
RFC-RF2
On
Off
Off
On
1. External DC blocking capacitors are required on all RF ports.
2. If negative control is used, DC blocking capacitors are not required on RF ports.