RFSA2033

Low Loss Voltage Controlled Attenuator

50MHz to 6000MHz

Package: QFN, 16-Pin, 0.9mm x 3mm x 3mm

trademarks are the property of their respective owners. ©2009, RF Micro Devices, Inc.

DS1300418

7628 Thorndike Road, Greensboro, NC 27409-9421 – For sales or technical

Support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com

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Features



Patent Pending Circuit Architecture



Broadband 50MHz to 6000MHz

Frequency Range



Low Minimum Insertion Loss (1.0dB

Typical at 2GHz)



25dB Attenuation Range



+40dBm IIP3 Typical



+75dBm IIP2 Typical



High 1dB Compression Point

>+24dBm



Low Supply Current 2.5mA Typical



3V to 5V Power Supply



Linear in dB Control Characteristic



Internal Temperature Compensation



Low Distortion with -65dBc CSO, CTB

and XMOD



Class 2 ESD (2000V HBM)



Complete Solution in a Small 3mm x

3mm, QFN Package

Applications



Cellular, 3G Infrastructure



WiBro, WiMax, LTE



Microwave Radio



High-linearity Power Control



Cable Modems



CATV

Product Description

RFMD’s RFSA2033 is a fully monolithic analog voltage controlled attenuator (VCA)

featuring exceptional linearity over a typical temperature-compensated 25dB gain

control range and low insertion loss of 1.0dB typical. It incorporates a

revolutionary new circuit architecture to solve a long standing industry problem:

high IP3, high attenuation range, low DC current, broad bandwidth, and

temperature-compensated linear in dB control voltage characteristic. This voltage

controlled attenuator is controlled by a single positive control voltage with on chip

DC conditioning circuitry. The slope polarity of the control voltage versus gain is

selectable. The RFSA2033 draws a very low 2.5mA current. This attenuator is

matched to 50Ω over its rated control range and frequency with no external

matching components require. Typical VCA’s in this performance category have

poor inherent attenuation versus temperature and poor nonlinear attenuation

versus control voltage characteristics. To correct these shortcomings, other VCA’s

require extensive off chip analog support circuitry that consume valuable PCB

area and additional DC power. This game changing product incorporates the

complete solution in a small 3mm x 3mm QFN package that reduces the footprint

in area and reduces the DC power over conventional PIN diode approaches.

Ordering Information

RFSA2033SQ

Sample bag with 25 pieces

RFSA2033SR

7” Reel with 100 pieces

RFSA2033TR7

7” Reel with 2500 pieces

RFSA2033PCK-410

50MHz to 6000MHz PCBA with 5-piece sample bag

RFSA2033PCK-411

CATV, 75Ω PCBA with 5-piece sample bag

3

2

4

1

10

11

9

12

CONTROL

BLOCK

ATTEN

RFIN

RFOUT

GND

GND

GND

GND

EN

GND

Functional Block Diagram