RF Micro Devices Inc.

7628 Thorndike Road, Greensboro, NC 27409-9421

DS150205

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

RF MICRO DEVICES

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RFSA3715

5MHz to 4000MHz, Digital Step Attenuator

The

RFMD’s RFSA3715 is a 7-bit digital step attenuator

(DSA) that features high linearity over the entire 31.75dB gain

control range with 0.25dB steps. The RFSA3715 features

three modes of control: serial addressable, latched parallel

and direct parallel programming. The RFSA3715 has a low

insertion loss of 1.5dB at 2GHz. Patent pending circuit

architecture providing overshoot-free transient switching

performance. External address pins allow up to eight DSAs to

be controlled on a single bus. The RFSA3715 is available in a

5mm x 5mm QFN package.

32

1

2

3

4

5

6

31

30

29

28

27

24

23

22

21

20

19

9

10

11

12

13

14

7-BIT DSA

LOGIC CONTROL

NC

VDD

PBAR/S

A0

GND

GND

CLK

LE

A1

A2

GND

GND

7

8

RFIN

GND

18

17

RFOUT

GND

26

25

15

16

Functional Block Diagram

Ordering Information

RFSA3715SQ

Sample bag with 25 pieces

RFSA3715SR

7" Reel with 100 pieces

RFSA3715TR13

13" Reel with 2500 pieces

RFSA3715PCK-410

5MHz to 4000MHz PCBA with 5-piece sample bag

Package: QFN, 32-pin,

5.0mm x 5.0mm x 0.85mm

Features

■

7-Bit, 31.75dB Range, 0.25dB Step

■

Patent Pending Circuit Architecture

■

Overshoot-free Transient

Switching Performance

■

Frequency Range 5MHz to

4000MHz

■

High Linearity, IIP3 >55dBm

■

Serial and Parallel Control

Interface

■

Fast Switching Speed, <120nsec

■

Serial Addressable Supports Up to

Eight Addresses

■

Single Supply 3V to 5V Operation

■

RF Pins Have No DC Voltage, Can

Be DC Grounded Externally

■

Power-up Default Setting is

Maximum Attenuation

Applications

■

2G through 4G Base Stations

■

Point-to-Point

■

WiMax/WiFi

■

Test Equipment

RFSA3715