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20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

Order On-line at www.hittite.com

v00.0805

Typical Application Circuit

Notes:

1. Set logic gate and switch Vdd = +3V to +5V and use HCT series logic to provide a TTL driver interface.

2. Control inputs A/B can be driven directly with CMOS logic (HC) with Vdd of +3 to +8 Volts applied to the CMOS logic gates.

3. DC Blocking capacitors are required for each RF port as shown. Capacitor value determines lowest frequency of operation.

4. Highest RF signal power capability is achieved with V set to +10V. The switch will operate properly (but at lower RF power

capability) at bias voltages down to +3V.

Pin Descriptions

Pin Number

Function

Description

Interface Schematic

1, 3, 5

RF2, RF1, RFC

This pin is DC coupled and matched to 50 Ohm.

Blocking capacitors are required.

2

GND

This pin must be connected to RF/DC ground.

4

B

See truth table and control voltage table.

6

A

See truth table and control voltage table.

GaAs MMIC 3 WATT T/R SWITCH,

DC - 3 GHz