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9

HMC425LP3

0.5 dB LSB GaAs MMIC 6-BIT DIGITAL

POSITIVE CONTROL ATTENUATOR, 2.4 - 8.0 GHz

v00.0202

Functional Diagram

Electrical Specifications,

T

Typical Applications

The HMC425LP3 is ideal for:

• WLAN & Point-to-Multi-Point

• Fiber Optics & Broadband Telecom

• Microwave Radio & VSAT

• Military

Features

0.5 dB LSB Steps to 31.5 dB

Single Control Line Per Bit

+/- 0.5 dB Typical Bit Error

Single +5V Supply

3 mm x 3 mm x 1 mm SMT Package

General Description

The HMC425LP3 is a broadband 6-bit GaAs IC

digital attenuator in a low cost leadless surface

mount package. Covering 2.4 to 8.0 GHz, the

insertion loss is less then 3.8 dB typical. The

attenuator bit values are 0.5 (LSB), 1, 2, 4, 8, and

16 dB for a total attenuation of 31.5 dB. Attenua-

tion accuracy is excellent at ± 0.5 dB typical step

error with an IIP3 of +40 dBm. Six control volt-

age inputs, toggled between 0 and +3 to +5V, are

used to select each attenuation state. A single

Vdd bias of +3 to +5V is required.

Parameter

Frequency

(GHz)

Min.

Typ.

Max.

Units

Insertion Loss

2.4 - 6.0 GHz

6.0 - 8.0 GHz

3.0

3.8

3.5

4.3

dB

dB

Attenuation Range

2.4 - 8.0 GHz

31.5

dB

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

2.4 - 8.0 GHz

11

15

dB

Attenuation Accuracy:

(Referenced to Insertion Loss)

All States

2.4 - 8.0 GHz

± 0.5 + 5% of Atten. Setting Max.

dB

Input Power for 0.1 dB Compression

Vdd = 5V

Vdd = 3V

2.4 - 8.0 GHz

22

19

dBm

dBm

Input Third Order Intercept Point

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

REF - 16.0 dB States

16.5 - 31.5 dB States

2.4 - 8.0 GHz

45

35

dBm

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

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

2.4 - 8.0 GHz

160

180

ns

ns