MICROWAVE CORPORATION

9 - 97

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12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

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9

HMC424LP3

0.5dB LSB GaAs MMIC 6-BIT DIGITAL

ATTENUATOR, DC - 13 GHz

v04.0604

Evaluation PCB

The circuit board used in the final application should use RF circuit design techniques. Signal lines should have

50 ohm impedance while the package ground leads and exposed paddle should be connected directly to the

ground plane similar to that shown. A sufficient number of via holes should be used to connect the top and bottom

ground planes. The evaluation circuit board shown is available from Hittite upon request.

List of Material

* R1 - R6 = 100 Ohm.

These resistors are optional

and may be used to enhance

decoupling of the RF path

from the control inputs.

Item

Description

J1 - J2

PC Mount SMA Connector

J3

8 Pin DC Connector

C1

0.01 µF Capacitor, 0603 Pkg.

R1 - R6

100 Ohm Resistor, 0603 Pkg.

U1

HMC424LP3 Digital Attenuator

PCB*

105245 Evaluation PCB

* Circuit Board Material: Rogers 4350