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5

5 - 60

General Description

Features

Functional Diagram

0.5 dB LSB Steps to 15.5 dB

CMOS Compatible Serial Data Interface

SPI Compatible Serial Output

±0.3 dB Typical Bit Error

Included in the HMC-DK004 Designer’s Kit

Typical Applications

The HMC305LP4 & HMC305LP4E are broadband

5-bit positive control GaAs IC digital attenuators with

CMOS compatible serial-to-parallel drivers packaged

in leadless QFN 4x4 mm SMT packages. Covering

0.7 to 3.8 GHz, the insertion loss is typically less

than 1.5 to 2 dB. The attenuator bit values are 0.5

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

15.5 dB. Attenuation accuracy is excellent at ±0.25

dB typical with an IIP3 of up to +52 dBm. Five bit

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 HMC305LP4 / HMC305LP4E 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 - 3.8 GHz

1.2

1.5

1.8

2.0

1.5

2.0

2.3

2.5

dB

dB

dB

dB

Attenuation Range

0.7 - 3.8 GHz

15.5

dB

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

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.7 - 3.8 GHz

17

18

19

15

dB

dB

dB

dB

Attenuation Accuracy: (Referenced to Insertion Loss)

All Attenuation States

0.7 - 0.9 GHz

0.9 - 2.2 GHz

2.2 - 3.8 GHz

± (0.5 +5% of Atten. Setting) Max

± (0.3 +4% of Atten. Setting) Max

± (0.5 +5% of Atten. Setting) Max

dB

dB

dB

Input Power for 0.1 dB Compression

Vcc = 5V

Vcc = 3V

0.7 - 3.8 GHz

25

23

dBm

dBm

Input Third Order Intercept Point

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

Vcc = 5V

Vcc = 3V

0.7 - 3.8 GHz

52

48

dBm

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

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

0.7 - 3.8 GHz

750

830

ns

ns

0.5 dB LSB GaAs MMIC 5-BIT SERIAL

CONTROL DIGITAL ATTENUATOR, 0.7 - 3.8 GHz

v03.0809