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5 - 170

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1 dB LSB GaAs MMIC 4-BIT DIGITAL

POSITIVE CONTROL ATTENUATOR, DC - 5.5 GHz

v00.0605

Functional Diagram

Electrical Specifications,

T

The HMC540LP3 / HMC540LP3E is ideal for both RF

and IF applications:

• Cellular Infrastructure

• ISM, MMDS, WLAN, WiMAX, WiBro

• Microwave Radio & VSAT

• Test Equipment and Sensors

1 dB LSB Steps to 15 dB

± 0.2 dB Typical Step Error

Low Insertion Loss: 1 dB

High IP3: +50 dBm

Single Control Line Per Bit

TTL/CMOS Compatible Control

Single +5V Supply

3x3 mm SMT Package

The HMC540LP3 & HMC540LP3E are broadband

4-bit GaAs IC digital attenuators in low cost leadless

surface mount packages. This single positive control

line per bit digital attenuator utilizes off chip AC

ground capacitors for near DC operation, making it

suitable for a wide variety of RF and IF applications.

Covering DC to 5.5 GHz, the insertion loss is less

than 1 dB typical. The attenuator bit values are

1 (LSB), 2, 4 and 8 dB for a total attenuation of 15 dB.

Attenuation accuracy is excellent at ± 0.2 dB typical

step error. The attenuator also features a IIP3 of +50

dBm. Four TTL/CMOS control inputs 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 - 2.0 GHz

2.0 - 3.0 GHz

3.0 - 4.0 GHz

4.0 -5.5 GHz

0.8

1.0

1.3

2.2

1.1

1.3

1.6

2.6

dB

dB

dB

dB

Attenuation Range

DC - 5.5 GHz

15

dB

Return Loss (RF1 & RF2, All Atten. States)

DC - 3.5 GHz

3.5 - 5.5 GHz

20

15

dB

dB

Attenuation Accuracy:

(Referenced to Insertion Loss)

All States

DC - 1.0 GHz

1.0 - 4.0 GHz

4.0 - 5.0 GHz

5.0 - 5.5 GHz

± (0.2 + 2% of Atten. Setting) Max.

± (0.2 + 3% of Atten. Setting) Max.

± (0.3 + 5% of Atten. Setting) Max.

± (0.4 + 8% of Atten. Setting) Max.

dB

dB

dB

dB

Input Power for 0.1 dB Compression

0.1 - 5.5 GHz

27

dBm

Input Third Order Intercept Point

(Two-Tone Input Power= 0 dBm Each Tone)

REF - 4 dB States

5 - 15 dB States

0.1 - 5.5 GHz

50

45

dBm

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

tON, tOFF (50% CTL to 10/90% RF)

DC -5.5 GHz

95

100

ns

ns

Typical Applications

Features

General Discription