Functional Schematic

Features

•

Low Insertion Loss 0.3 dB Typ. @ 2.4 GHz

•

Moderate Isolation 21 dB @ 2.4 GHz

•

Low Power Consumption <5 µA @ +2.3V

•

Low Cost Plastic SOT-363 Package

Description

M/A-COM’s SW -485 is a GaAs PHEMT MMIC SPDT

switch in a low cost SC-70 (SOT-363) surface mount plas-

tic package. The SW-485 is ideally suited for applications

where very small size and low cost are required. Typical

applications are dual band systems where switching b e-

tween small signal components is required such as filter

banks, single-band LNAs, converters, etc. This part can be

used for low power, low loss requirements in the all sys-

tems operating up to 3 GHz, including PCS, GSM, DCS,

Blue Tooth, and other Rx chain applications.

The SW -485 is fabricated using a 0.5 micron gate length

GaAs PHEMT process. The process features full passiv a-

tion for performance and reliability.

Handling Procedures

The following precautions should be observed to avoid

damage:

Static Sensitivity

Gallium Arsenide Integrated Circuits are ESD sensitive and

can be damaged by static electricity. Proper ESD tech-

niques should be used when handling these devices.

GaAs SPDT Switch

0.05 - 3.0 GHz

RF1

GND

RF2

V1

RFC

V2

PIN 1

C=39pF

C=39pF

C=39pF

Pin No.

Function

Description

1

RF1

RF Port 1

2

GND

Ground

3

RF2

RF Port 2

4

V2

Control 2

5

RFC

RF Input

6

V1

Control 1

Pin Configuration

Truth Table

2

Mode

(Control)

Control

V1

Control

V2

RFC- RF1 RFC-RF2

0 ± 0.2V

+2.3 to +5V

+2.3 to +5V

0 ± 0.2V

On

Off

Off

On

2. External DC blocking capacitors are required on all RF

ports.

Parameter

Absolute

Maximum

Max Input Power (0.5 - 3.0 GHz)

3 V Control

+32 dBm

5 V Control

+34 dBm

Operating Voltage

+8.5 volts

Operating Temperature

-40 °C to +85 °C

Storage Temperature

-65 °C to +150 °C

1. Exceeding any one or combination of these limits may

cause permanent damage.

Absolute Maximum Ratings

1