1 of 12

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. ©2012, 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



12

SPI

RF1

GND

VDD

GND

GND

RF2

GND

GND

GND

GND

GND

6-Bit DSA

11

10

9

8

7

6

5

4

3

2

1

13

14

15

16

17

18

24

23

22

21

20

19

GND

RFSA2644

SERIAL CONTROLLED DIGITAL STEP ATTENUATOR

50MHz TO 4000MHz, 6-BIT, 0.5dB LSB

RFMD’s RFSA2644 is a 6-bit digital step attenuator (DSA) that features high linear-

ity over the entire 31.5dB gain control range with excellent step accuracy in 0.5dB

steps. The RFSA2644 is programmed via a serial mode control interface that is

both 3V and 5V compatible. The RFSA2644 also offers a rugged Class 1C HBM ESD

rating via on-chip ESD circuitry. The MCM package is footprint compatible with most

24-pin, 4mm x 4mm, QFN packages.

Features



Frequency Range 50MHz to

4000MHz



6-Bits, 31.5dB Range, 0.5dB

Step



High Linearity, IP3 >48dBm



3V and 5V Logic Compatible



Serial-to-Parallel Controller



Serial Programming Interface



Power-up Programming Modes



On-Chip ESD Protection Class 1C

HBM



Single Supply, 3V to 5V Operation



Footprint Compatible with Most

24-Pin, 4mm x 4mm, QFNs

Applications



Transceiver RF and IF

Applications



Cellular, PCS, GSM, UMTS, LTE,

WiMax/WiFi



Wireless Data, Satellite

Terminals



Test Equipment

DS120706



Package: MCM, 24-Pin, 4.2mm x 4.2mm

RFSA2644

Serial Con-

trolled Digital

Step Attenua-

tor

RFSA2644SR

7” Sample reel with 100 pieces

RFSA2644SQ

25-Piece sample bag

RFSA2644TR7

7” Reel with 750 pieces

RFSA2644TR13

13” Reel with 2500 pieces

RFSA2644PCK-410 50MHz to 4000MHz PCBA with 5-piece sample bag