RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS160619

For sales or technical support, contact RFMD at +1.336.678.5570 or customerservice@rfmd.com.

RF MICRO DEVICES

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RFSA3043

75Ω Voltage Controlled Attenuator

5MHz to 3000MHz

RFMD’s RFSA3043 is a fully monolithic analog voltage controlled

attenuator (VCA) featuring exceptional linearity over a typical temperature

compensated 30dB gain control range. 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 of the control voltage versus

gain is selectable. The RFSA3043 draws a very low 2mA current and is

packaged in a small 3mm x 3mm QFN. This attenuator is matched to 75

Ω

over its rated control range and frequency with no external matching

components required. Typical VCAs in this performance category have poor

inherent attenuation versus temperature and poor nonlinear attenuation

versus control voltage characteristics. To correct these short-comings, other

VCAs require extensive off chip analog support circuitry that consumes

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 20x in area and reduces the DC power by 5x over

conventional PIN diode approaches.

Functional Block Diagram

Ordering Information

RFSA3043SQ

Sample bag with 25 pieces

RFSA3043SR

7" Reel with 100 pieces

RFSA3043TR7

7" Reel with 2500 pieces

RFSA3043PCK-410

5MHz to 3000MHz PCBA with 5-piece sample

bag

Package: QFN, 16-pin,

3.0mm x 3.0mm

Features

■

Patent Pending Circuit Architecture

■

Broadband 5MHz to 3000MHz

Frequency Range

■

30dB Attenuation Range

■

+50dBm Input IP3 Typical

■

+80dBm Input IP2 Typical

■

Low Distortion -80dBc CSO and

-75dBc CTB for 132 Channel

38dBmV Input

■

High 1dB Compression Point

>+30dBm

■

Low Supply Current 2mA Typical

■

3V to 5V Power Supply

■

Linear in dB Control Characteristic

■

Internal Temperature

Compensation

■

Class 2 ESD (2000V)

■

Complete Solution in a Small 3mm

x 3mm, QFN Package

Applications

■

Cable Modems

■

CATV

■

High Linearity Power Control

RFSA3043