RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS150225

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

RF MICRO DEVICES

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RFSA4033

RFSA4033

Programmable Temperature Compensating Attenuator

5MHz to 6000MHz

The RFSA4033 is a fully monolithic linear-in-dB analog temperature

compensating attenuator (TCA) featuring 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.

Eight customer selectable scaled attenuation slopes and eight selectable

nominal attenuation values at 25°C creates a total combination of 64

possible temperature coefficients which 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. Traditional approaches for solving

this problem require expensive co-fired ceramics with temperature sensitive

materials or current hungry PIN diodes with elaborate area consuming

control circuits. This temperature compensating attenuator requires only a

single supply voltage and 6 logic bits to set the temperature coefficient. The

RFSA4033 is packaged in a small 3mm x 3mm QFN. This attenuator is

matched to 50

Ω over its rated control range and frequency with no external

matching components required.

16

1

2

3

4

15

14

13

12

11

10

9

5

6

7

8

ATTENUATOR

CONTROL

SYSTEM

GND

GND

RFIN

GND

GND

GND

RFOUT

GND

Functional Block Diagram

Ordering Information

RFSA4033SQ

Sample bag with 25 pieces

RFSA4033SR

7" Reel with 100 pieces

RFSA4033TR7

7" Reel with 2500 pieces

RFSA4033PCK-410

5MHz to 6GHz PCBA with 5-piece sample bag

Package: QFN, 16-pin,

3.0mm x 3.0mm x 0.85mm

Features

■

Patent Pending Circuit Architecture

■

Broadband 5MHz to 6000MHz

Frequency Range

■

64 Selectable Attenuation versus

Temperature Linear-in-dB Slopes

■

+52dBm Input IP3 Typical

■

+80dBm Input IP2 Typical

■

High 1dB Compression Point

>+30dBm

■

Low Residual Phase Noise

<-140dBc/Hz at 10kHz offset

■

3V to 5V Power Supply

■

3V Logic Compatible

■

Class 2 ESD (2000V HBM)

Applications

■

Cellular, 3G, LTE Infrastructure

■

WiBro, LTE

■

Microwave Radio

■

High Linearity RF Power Control

■

Cable Modems

■

CATV

■

Test Equipment

RFSA4033