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0.25 dB LSB GaAs MMIC 5-BIT DIGITAL

POSITIVE CONTROL ATTENUATOR, DC - 4 GHz

v00.0605

Functional Diagram

Electrical Specifications,

T

The HMC539LP3 / HMC539LP3E is ideal for both RF

and IF applications:

• Cellular Infrastructure

• ISM, MMDS, WLAN, WiMAX, WiBro

• Microwave Radio & VSAT

• Test Equipment and Sensors

0.25 dB LSB Steps to 7.75 dB

± 0.05 dB Typical Step Error

Low Insertion Loss: 0.7 dB

High IP3: +50 dBm

Single Control Line Per Bit

TTL/CMOS Compatible Control

Single +5V Supply

3x3 mm SMT Package

The HMC539LP3 & HMC539LP3E are broadband

5-bit GaAs IC digital attenuators in low cost lead-

less surface mount packages. This single positive

control line per bit digital attenuator utilizes an off

chip AC ground capacitor for near DC operation,

making it suitable for a wide variety of RF and IF

applications. Covering DC to 4 GHz, the insertion loss

is less than 0.7 dB typical. The attenuator bit values

are 0.25 (LSB), 0.5, 1, 2, and 4 dB for a total attenu-

ation of

7.75 dB. Attenuation accuracy is excellent

at ± 0.05 dB typical step error. The attenuator also

features a high IIP3 of +50 dBm.

Five 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 - 1.5 GHz

1.5 - 3.0 GHz

3.0 - 4.0 GHz

0.7

1.0

1.3

1.0

1.3

1.7

dB

dB

dB

Attenuation Range

DC - 4 GHz

7.75

dB

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

DC - 3 GHz

3.0 - 4.0 GHz

25

20

dB

dB

Attenuation Accuracy:

(Referenced to Insertion Loss)

All States

DC - 3 GHz

3.0 - 4.0 GHz

± (0.2 + 2% of Atten. Setting) Max.

± (0.2 + 4% of Atten. Setting) Max.

dB

dB

Input Power for 0.1 dB Compression

0.1 - 4.0 GHz

28

dBm

Input Third Order Intercept Point

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

0.1 - 4.0 GHz

50

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

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

DC - 4 GHz

48

52

ns

ns

Typical Applications

Features

General Discription