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Phone: 978-250-3343

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Application Support: Phone: 978-250-3343 or apps@hittite.com

5

HMC939LP4 / 939LP4E

v01.1211

1.0 dB LSB GaAs MMIC 5-BIT DIGITAL

ATTENUATOR, 0.1 - 33 GHz

Pad Number

Function

Description

Interface Schematic

1

Vss

Negative Bias -5V

2-4, 6-13,

15-17, 19

n/C

The pins are not connected internally; however, all data

shown herein was measured with these pins connected to

RF/DC ground externally.

5, 14

RF1, RF2

These pins are DC coupled and matched to 50 Ohm. Blocking

capacitors are required if RF line potential is not equal to 0V.

18

Vdd

Positive Bias +5V

20 - 24

P0 - P4

See truth table and control voltage table.

GND

Package bottom must be connected to RF/DC ground.

Pin Descriptions

Truth Table

Control Voltage Input

Attenuation

State

RF1 - RF2

P4

16 dB

P3

8 dB

P2

4 dB

P1

2 dB

P0

1 dB

High

High

High

High

High

Reference I.L.

High

High

High

High

Low

1 dB

High

High

High

Low

High

2 dB

High

High

Low

High

High

4 dB

High

Low

High

High

High

8 dB

Low

High

High

High

High

16 dB

Low

Low

Low

Low

Low

31 dB

Any Combination of the above states will provide an attenuation

approximately equal to the sum of the bits selected.