1 of 14

Optimum Technology Matching® Applied

GaAs HBT

InGaP HBT

GaAs MESFET

SiGe BiCMOS

Si BiCMOS

SiGe HBT

GaAs pHEMT

Si CMOS

Si BJT

GaN HEMT

Functional Block Diagram

RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-

mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.

Product Description

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

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

Ordering Information

BiFET HBT

LDMOS



3

2

4

1

10

11

9

12

15

14

16

13

6

7

5

8

CONTROL

BLOCK

ATTEN

RFIN

RFOUT

NC

GND

NC

NC

NC

GND

RFSA4023

TEMPERATURE COMPENSATING ATTENUATOR

RFMD's RFSA4023 is a fully monolithic analog temperature compensating attenuator (TCA) fea-

turing exceptional linearity over its entire gain control range. It is designed to offset the gain

reduction of an RF component over temperature without the need for closed loop feedback.

Three customer selectable temperature coefficients make it a flexible solution for RF lineups. It

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

with regards to attenuator architecture: high IP3, low DC current and broad bandwidth. Tradi-

tional approaches for solving this problem require expensive co-fired ceramics with tempera-

ture sensitive materials or current hungry PIN diodes with elaborate area consuming control

circuits. This temperature compensating attenuator requires only a single supply voltage and

two logic bits to set control attenuation slope versus temperature. The RFSA4023 draws a very

low 1mA current and is packaged in a small 3mmx3mm QFN. This attenuator is matched to

50

 over its rated control range and frequency with no external matching components

required.

Features



Patent Pending Circuit

Architecture



Broadband 50MHz to 6000MHz

Frequency Range



3 Selectable Attenuation versus

Temperature Slopes



+55dBm IIP3 Typical



+85dBm IIP2 Typical



High 1dB Compression Point

>+30dBm



Low Supply Current 1mA Typical



3.3V Power Supply



Class 1C ESD ( 1000V )



Complete Solution in a Small

3mmx3mm QFN Package



5V Part Available - RFSA4013

Applications



Cellular, 3G Infrastructure



WiBro, WiMax, LTE



Microwave Radio



High-Linearity Level Control

DS140117

Package: QFN, 16-Pin, 0.9mmx3mmx3mm

RFSA4023SQ

Sample bag with 25 pieces

RFSA4023SR

7” Sample reel with 100 pieces

RFSA4023TR7

7” Reel with 2500 pieces

RFSA4023PCK-410 50MHz to 6000MHz PCBA with 5-piece sample bag