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

Order On-line at www.hittite.com

Designer’s Kit

Available

1 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz

General Description

Features

Functional Diagram

1 dB LSB Steps to 31 dB

CMOS Compatible Serial Data Interface

SPI Compatible Serial Output

+/- 0.4 dB Typical Bit Error

4 x 4 mm QFN Plastic Package

Included in the HMC-DK004 Designer’s Kit

Typical Applications

The HMC271LP4 & HMC271LP4E are broadband

5-bit positive control GaAs IC digital attenuators with

CMOS compatible serial-to-parallel drivers in low

cost leadless QFN 4x4 mm SMT packages. Covering

0.7 to 3.7 GHz, the insertion loss is typically less than

2.5 dB. The attenuator bit values are 1 (LSB), 2, 4, 8,

and 16 dB for a total attenuation of 31 dB. Accuracy

is excellent at ± 0.4 dB typical with an IIP3 of up to

+48 dBm. Five bit CMOS compatible serial control

words are used to select each attenuation state.

A single Vcc bias of +3V to +5V applied through an

external 5k Ohm resistor is required.

The HMC271LP4 / HMC271LP4E is ideal for:

• Cellular/3G Infrastructure

• Fixed Wireless, WiMax & WiBro

• Test Instrumentation

Parameter

Frequency

Min.

Typical

Max.

Units

Insertion Loss

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 3.7 GHz

1.9

2.3

2.6

2.8

2.4

2.8

3.1

3.3

dB

dB

dB

dB

Attenuation Range

0.7 - 3.7 GHz

31

dB

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

0.7 - 1.4 GHz

1.4 - 2.7 GHz

2.7 - 3.7 GHz

12

15

16

dB

dB

dB

Attenuation Accuracy: (Referenced to Insertion Loss)

All Attenuation States

0.7 - 0.9 GHz

0.9 - 2.2 GHz

2.2 - 3.7 GHz

± (0.4 + 5% of Atten. Setting) Max

± (0.4 + 4% of Atten. Setting) Max

± (0.4 + 5% of Atten. Setting) Max

dB

dB

dB

Input Power for 0.1 dB Compression

Vcc = 5V

Vcc = 3V

0.7 - 3.7 GHz

24

22

dBm

dBm

Input Third Order Intercept Point

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

Vcc = 5V

Vcc = 3V

0.7 - 3.7 GHz

48

46

dBm

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

tON, tOFF (Latch Enable to 10/90% RF)

0.7 - 3.7 GHz

750

830

ns

ns

v02.0705