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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0.5 dB LSB GaAs MMIC 6-BIT DIGITAL

SERIAL CONTROL ATTENUATOR, DC - 3 GHz

v03.0809

Functional Diagram

the HMC542LP4(e) is ideal for:

• Cellular/PCs/3G Infrastructure

• IsM, MMDs, WLAn, WiMAX, & WiBro

• Microwave radio & VsAt

• test equipment and sensors

0.5 dB LsB steps to 31.5 dB

ttL/CMos Compatible serial Data Interface

sPI Compatible serial output

± 0.25 dB typical step error

single +5V supply

24 Lead 4x4mm QFn Package: 16mm²

the HMC542LP4(e) is a broadband 6-bit GaAs IC

digital attenuator with a CMos compatible serial

to parallel driver in low cost leadless surface mount

package. this serial control digital attenuator incorp

rates off chip AC ground capacitors for near DC opera-

tion, making it suitable for a wide variety of rF and IF

applications. Covering DC to 3 GHz, the insertion loss

is 1.5 dB and the attenuator bit values are 0.5 (LsB),

1, 2, 4, 8, and 16 dB for a total attenuation of 31.5 dB.

Attenuation accuracy is excellent at ±0.25 dB typi-

cal step error with an IIP3 of +45 dBm. six bit serial

control words are used to select each attenuation

state. A single Vdd bias of +5V is required.

Parameter

Frequency (GHz)

Min.

typ.

Max.

units

Insertion Loss

DC - 1.5 GHz

1.5 - 3.0 GHz

1.2

1.5

1.5

1.8

dB

dB

Attenuation range

DC - 3 GHz

31.5

dB

return Loss (rF1 & rF2, All Atten. states)

DC - 3 GHz

17

dB

Attenuation Accuracy: (referenced to Insertion Loss)

All Attenuation states

0.5 - 3.5 dB states

4.0 - 31.5 dB states

All Attenuation states

DC - 1.0 GHz

1.0 - 2.2 GHz

1.0 - 2.2 GHz

2.2 - 3.0 GHz

± (0.20 + 3% of Atten. setting) Max.

± (0.25 + 3% of Atten. setting) Max.

± (0.15 + 4% of Atten. setting) Max.

± (0.30 + 3% of Atten. setting) Max.

dB

dB

dB

dB

Input Power for 0.1 dB Compression

0.1 - 3.0 GHz

20

dBm

Input third order Intercept Point

(two-tone Input Power= 0 dBm each tone)

0.1 - 1.5 GHz

1.5 - 3.0 GHz

35

45

dBm

dBm

switching Characteristics

trIse, tFALL (10/90% rF)

ton, toFF (50% CtL to 10/90% rF)

DC - 3 GHz

800

900

ns

ns

Typical Applications

Features

General Description