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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

5

5 - 5

DIS

CO

NTIN

UE

D

PR

OD

UC

T

No

t Reco

mm

ended

for

Ne

w D

esi

gns

Pin Number

Function

Description

Interface Schematic

1, 3, 4, 6, 10, 12, 13,

15, 16, 18

N/C

These pins should be connected to PCB RF ground to

maximize performance.

2, 17

RF1, RF2

This pin is DC coupled and matched to 50 Ohms

Blocking capacitors are required. Select value based on

lowest frequency of operation.

5Serial Output

Serial data output. Serial input data

delayed by 8 clock cycles.

7Reset

See truth table, control voltage table and timing diagram.

8

Shift Clock

9

Latch Enable

11

Serial Input

14

Vcc

Supply Voltage.

19 - 24

GND

Package bottom has an exposed metal paddle that must also

be connected to RF/DC Ground.

Pin Descriptions

HMC271LP4 / 271LP4E

v03.0809

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz