M A COM SW-438TR-3000, SW-438SMB Datasheet

GaAs SPDT Switch
DC– 3.0 GHz

V 1.00

SW-438

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 applica­tions include transmit/receive switching for Bluetooth and
WLAN equipment. The SW-438 can also be used in applica­tions up to 500 mW in systems such as cellular, PCS,
DCS1800, GSM, CDMA and other analog and digital wire­less communications systems.

M/A-COM fabricates the SW-438 using a 0.5 micron gate
length GaAs p-HEMT process. The process features full pa s­sivation for increased performance and reliability.

External Component Requirements

Please note the values of the external capacitors. The ca­pacitors 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 recom­mended for 2 - 3 GHz operation. If this value is changed or
the capacitor placed too far from the switch, the perform­ance 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.

Functional Schematic

C=100pF

V1 RFC V2

RF1 GND RF2

PIN 1

2.4 GHz Application

C=8pF C=8pF

C=8pF

C=100pF

C=100pF

V1 RFC V2

RF1 GND RF2

PIN 1

C≥39pF C≥39pF

C≥39pF

Broad Band Applications

Pin Configuration

Pin No. Function Description

1 RF1 RF Input/Output
2 GND RF Ground
3 RF2 RF Input/Output
4 V2 Control 2 Input
5 RFC RF Common Port

6 V1 Control 1 Input

Ordering Information

Part Number Package

SW-438TR-3000 SW-438 on 13 Inch, 3000 piece Reel

C=100pF

SW-438SMB SW-438 sample test board

Truth Table

Mode

(Control)

Positive1 0 + 0.2V

Negative 2 0 + 0.2V

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.

V1 V2 RFC-RF1 RFC-RF2

+2.3 to +5V

-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

GaAs SPDT Switch, DC-3.0 GHz

Insertion Loss (dB)

Electrical Specifications: TA = 25°C, 3V Control

Parameter Test Conditions Units Min Typ Max

Insertion Loss DC-3.0 GHz dB 0.7 0.8

Isolation DC-1.0 GHz

Return Loss DC-1.5 GHz

P1dB (2.3 V supply) 500 MHz-2.0 GHz dBm 23 26

P1dB (3V supply) 500 MHz-2.0 GHz dBm 28 31

IP2 2-tone 900 MHz, 5 MHz spacing (2.3V) dBm 81
IP3 2-tone 900 MNz, 5 MHz spacing (2.3V) dBm 55

nd

2

Harmonic 2.4 GHz Pin = 20 dBm, Vc = 2.3V dBc 70

rd

3

Harmonic 2.4 GHz Pin = 20 dBm, Vc = 2.3V dBc 60

Ton, Toff 50% ctl to 10/90% RF ns 20

Trise, Tfall 10% to 90% RF ns 10

Gate Leakage |Vctl| = 5V µA 5 10

1.0-2.0 GHz

2.0-3.0 GHz

1.5-3.0 GHz

dB
dB
dB

dB
dB

29
23
21

18
16

31
25
23

22
20

SW-438

V 1.00

Typical Performance Curves

Bluetooth Applications

(8 pF DC Blocking Capacitors, +2.3V Control)

Insertion Loss vs. Frequency Over Temperature

1.0

0.9

+85°C

0.8

+25°C

0.7

0.6

-40°C

0.5

0.4

0.3

0.2

0.1

0.0

2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0

Frequency (GHz)

Isolation vs. Frequency Over Temperature

30
29
28
27
26
25
24

Isolation (dB)

23
22
21
20

2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0

Frequency (GHz)

+25°C

+85°C

-40°C

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

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