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20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373

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HMC425

0.5 dB LSB GaAs MMIC 6-BIT DIGITAL

POSITIVE CONTROL ATTENUATOR, 2.4 - 8.0 GHz

v02.0907

Electrical Specifications,

T

The HMC425 is ideal for:

• Fiber Optics & Broadband Telecom

• Microwave Radio & VSAT

• Military Radios, Radar, & ECM

• Space Applications

0.5 dB LSB Steps to 31.5 dB

Single Control Line Per Bit

±0.5 dB Typical Bit Error

Die Size: 1.5 x 0.85 x 0.1 mm

The HMC425 die is a broadband 6-bit GaAs IC

digital attenuator MMIC chip. Covering 2.4 to 8 GHz,

the insertion loss is less then 3.5 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. Attenuation

accuracy is excellent at ±0.5 dB typical step error

with an IIP3 of +40 dBm. Six control voltage 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

2.7

3.5

3.2

4.0

dB

dB

Attenuation Range

2.4 - 8.0 GHz

31.5

dB

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

2.4 - 8.0 GHz

12

15

dB

Attenuation Accuracy: (Referenced to Insertion Loss)

All States

2.4 - 8.0 GHz

± 0.4 + 4% 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

General Description

Features

Functional Diagram

Typical Applications