5

5 - 28

For price, delivery, and to place orders, please contact Hittite Microwave Corporation:

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

Order On-line at www.hittite.com

1 dB LSB GaAs IC 5-BIT DIGITAL

ATTENUATOR, 0.7 - 2.7 GHz

v01.0505

General Description

Features

Functional Diagram

1 dB LSB Steps to 31 dB

Single Positive Control (+3 to +5V) Per Bit

±0.5 dB Typical Bit Error

Small QSOP16 Plastic Package

Included in the HMC-DK004 Designer’s Kit

Typical Applications

The HMC274QS16 / HMC274QS16E is ideal for:

• Cellular/PCS/3G Infrastructure

• 2.4 GHz ISM Radios

• Wireless Data

The HMC274QS16 & HMC274QS16E are broadband

5-bit positive control GaAs IC digital attenuators in

16 lead QSOP plastic packages. Covering 0.7 to 2.7

GHz the insertion loss is typically less than 2.3 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 ± 0.5 dB typical with an IIP3 of up to

+50 dBm. Five bit control voltage inputs, toggled

between 0 and +3 to +5 volts, are used to select

each attenuation state. A single Vdd bias of +3 to +5

volts applied through an external 5K Ohm resistor is

required.

Parameter

Frequency

Min.

Typical

Max.

Units

Insertion Loss

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

2.0

2.3

2.5

2.4

2.7

3.1

dB

dB

dB

Attenuation Range

0.7 - 2.7 GHz

31

dB

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

0.7 - 1.4 GHz

1.4 - 2.7 GHz

10

12

15

17

dB

dB

Attenuation Accuracy: (Referenced to Insertion Loss)

All Attenuation States

All Attenuation States

All Attenuation States

0.7 - 1.4 GHz

1.4 - 2.3 GHz

2.3 - 2.7 GHz

± 0.35 + 5% of Atten. Setting Max

± 0.25 + 3% of Atten. Setting Max

± 0.30 + 5% of Atten. Setting Max

dB

dB

dB

Input Power for 0.1 dB Compression

Vdd = 5V

Vdd = 3V

0.7 - 2.7 GHz

29

20

dBm

dBm

Input Third Order Intercept Point

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

Vdd = 5V

Vdd = 3V

0.7 - 2.7 GHz

54

52

dBm

dBm

Switching Characteristics

tRISE, tFALL (10/90% RF)

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

0.7 - 2.7 GHz

560

600

ns

ns