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RF2948B

2.4GHz SPREAD-SPECTRUM TRANSCEIVER

RF Micro Devices 

0

Typical Applications

• IEEE 802.11b WLANs

• Wireless Residential Gateways

• Secure Communication Links

RF2948B

2.4GHz SPREAD-SPECTRUM TRANSCEIVER

• High Speed Digital Links

• Wireless Security

• Digital Cordless Telephones

Product Description

The RF2948B is a monolithic integrated circuit specifi-

cally designed for direct-sequence spread-spectrum sys-

tems operating in the 2.4GHz ISM band. The part

includes: a direct conversion from IF receiver with vari-

able gain control; quadrature demodulator; I/Q baseband

amplifiers; and, on-chip programmable baseband filters.

For the transmit side, a QPSK modulator and upconverter

are provided. The design reuses the IF SAW filter for

transmit and receive reducing the number of SAW filters

required. Two-cell or regulated three-cell (3.6V maxi-

mum) battery applications are supported by the part. The

part is also designed to be part of a 2.4GHz chipset con-

2 PLCS

0.10 C A

-A-

5.00 SQ.

0.90

0.85

2.50 TYP.

0.70

S0.65

3

2 PLCS

0.10 C B

N 2 PLCS

G 0.10 C B

I -B-

S2 PLCS

0.10 C A

4.75 SQ.

2.37 TYP.

DEShaded lead is pin 1.

0.60

0.24

TYP.

12°

MAX

-C-

0.10 M C A B

0.30 2

0.18

Pin 1 ID

R.20

0.05 C

0.05

0.00

SEATING

PLANE

sisting of the RF2494 LNA/Mixer, one of the many RFMD

high-efficiency GaAs HBT PA’s and the RF3000 Base-

band Processor.

EW Optimum Technology Matching® Applied

Si BJT

GaAs HBT

GaAs MESFET

9 N Si Bi-CMOS

SiGe HBT

Si CMOS

InGaP/HBT

GaN HEMT

SiGe Bi-CMOS

FOR PD 1

RX EN 2

RX IF BIAS 3

T VCC1 4

O RXIF IN 5

NTXIF IN 6

32

31

30

29

BW

Control

Logic

REF

28

27

26

25

DC

Feedback

gm-C

LPF

DC

Feedback

gm-C

LPF

TX

Bias

24 I OUT

23 VCC4

gm-C

LPF

22 TXQ DATA

Dimensions in mm.

0.50

0.30

3.45

3.15

SQ.

0.50

Package Style: QFN, 32-Pin, 5x5

Features

• 45MHz to 500MHz IF Quad Demod

• On-Chip Variable Baseband Filters

• Quadrature Modulator and Upconverter

• 2.7V to 3.6V Operation

• Part of IEEE802.11b Chipset

• 2.4GHz PA Driver

VCC9 7

Ordering Information

21 TXQ BP

TX VGC 8

Σ

gm-C

LPF

20 TXI DATA

RF2948B

2.4GHz Spread-Spectrum Transceiver

÷2

Phase

Splitter

19 TXI BP

RF2948BTR13 2.4GHz Spread-Spectrum Transceiver (Tape & Reel)

18 IF1 OUT+

RF2948B PCBA Fully Assembled Evaluation Board

9

10

11

12

13

14

15

16

Functional Block Diagram

17 IF1 OUT-

RF Micro Devices, Inc.

7628 Thorndike Road

Greensboro, NC 27409, USA

Tel (336) 664 1233

Fax (336) 664 0454

http://www.rfmd.com

Rev A6 040930

NOT FOR NEW DESIGNS

11-239

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