For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

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

Order On-line at www.hittite.com

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Application Circuit

DC blocking capacitors C1 & C2 are required on RF1 &

RF2. Choose C1 = C2 = 100 ~ 300 pF to allow lowest

customer specific frequency to pass with minimal loss.

R1 = 5K Ohm is required to supply voltage to the circuit

through either PIN 3 or PIN 1.

2 dB LSB GaAs MMIC 2-BIT DIGITAL

ATTENUATOR, 0.7 - 4.0 GHz

v01.0605

The circuit board used in the final application should

use RF circuit design techniques.

Signal lines

should have 50 ohm impedance while the pack-

age ground leads 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 cir-

cuit board as shown is available from Hittite Micro-

wave Corporation upon request.

Item

Description

J1 - J2

PCB Mount SMA Connector

J3 - J6

DC Pin

R1

5k Ohm Resistor, 0402 Chip

R2, R3

100 Ohm Resistor, 0402 Chip

C1, C2

0402 Chip Capacitor, Select for Lowest

Frequency of Operation

U1

HMC290 / HMC290E Digital Attenuator

103370 Evaluation PCB 1.5” x 1.5”

[1] Reference this number when ordering complete evaluation PCB

[2] Circuit Board Material: Rogers 4350

Evaluation Circuit Board

* R2 = R3 = 100 Ohm.

These resistors are optional

and may be used to enhance

decoupling of the RF path

from the control inputs.