12 - 9

For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

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

12

Pin Number

Function

Description

Interface Schematic

1

AMPIN

This pin is DC coupled.

An off chip DC blocking capacitor is required.

29

AMPOUT

RF output and DC bias (Vcc) for the output stage of the

amplifier.

2, 3, 13,

28, 30 - 32

GND

These pins and package bottom

must be connected to RF/DC ground.

4, 12

ATTIN,

ATTOUT

These pins are DC coupled and matched to 50 Ohms.

Blocking capacitors are required. Select value based

on lowest frequency of operation.

5 - 10

ACG1 - ACG6

External capacitors to ground is required. Select value for

lowest frequency of operation. Place capacitor as close to

pins as possible.

11

N/C

No connection

14

SEROUT

Serial input data delayed by 6 clock cycles.

15, 16

PUP2, PUP1

18 - 23

D5, D4, D3,

D2, D1, D0

24

P/S

25

CLK

26

SERIN

27

LE

17

Vdd

Supply Voltage

Pin Descriptions

HMC742LP5E

v05.0610

0.5 dB LSB GaAs MMIC 6-BIT DIGITAL

VARIABLE GAIN AMPLIFIER, 70 MHz - 4 GHz