4

4 - 24

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

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TTL Interface Circuit

Note:

Control inputs A and B can be driven directly with TTL logic with -5 Volts

applied to the HCT logic gates Vee pin and to Vee (pad) of the RF Switch.

Pad Descriptions

Pad Number

Function

Description

Interface Schematic

1, 2, 3,

4, 5, 10

RF4, RFC, RF1,

RF2, RF3

These pads are DC coupled and matched to 50 Ohms.

Blocking capacitors are required.

6

A

See truth table and control voltage table.

7

B

See truth table and control voltage table.

8

Vee

Supply Voltage -5.0 Vdc ±10%

9, Die

Bottom

GND

Die bottom and pad must be connected to RF/DC ground.

HMC344

v06.0709

GaAs MMIC SP4T NON-REFLECTIVE

SWITCH, DC - 8 GHz