11-239
Product Description
Ordering Information
Typical Applications
Features
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Optimum Technology Matching® Applied
Si BJT
GaAs MESFET
GaAs HBT
Si Bi-CMOS
SiGe HBT
Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
32
31
30
29
I OUT
24
28
27
VCC1
4
RX IF IN
5
PD
1
RX EN
2
RX IF BIAS
3
TX IF IN
6
VCC9
7
TX VGC
8
9
10
11
12
13
14
15
16
IF1 OUT-
17
IF1 OUT+
18
TXQ BP
21
TXQ DATA
22
TXI BP
19
TXI DATA
20
VCC4
23
25
Logic
REF
Phase
Splitter
BW
Control
gm-C
LPF
gm-C
LPF
gm-C
LPF
TX
Bias
gm-C
LPF
Σ
÷2
DC
Feedback
DC
Feedback
26
RF2948B
2.4GHz SPREAD-SPECTRUM TRANSCEIVER
• IEEE 802.11b WLANs
• Wireless Residential Gateways
• Secure Communication Links
• High Speed Digital Links
• Wireless Security
• Digital Cordless Telephones
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-
sisting of the RF2494 LNA/Mixer, one of the many RFMD
high-efficiency GaAs HBT PA’s and the RF3000 Base-
band Processor.
• 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
RF2948B
2.4GHz Spread-Spectrum Transceiver
RF2948BTR13
2.4GHz Spread-Spectrum Transceiver (Tape & Reel)
RF2948B PCBA
Fully Assembled Evaluation Board
0
Rev A6 040930
Shaded lead is pin 1.
-B-
2.50 TYP.
2.37 TYP.
5.00 SQ.
-A-
3
2 PLCS
0.10 C A
2 PLCS
0.10 C B
4.75 SQ.
2 PLCS
0.10 C A
2 PLCS
0.10 C B
0.05
0.00
0.70
0.65
12°
MAX
-C-
SEATING
PLANE
0.90
0.85
0.05 C
0.50
3.45
3.15
SQ.
Pin 1 ID
R.20
0.50
0.30
2
0.30
0.18
0.60
0.24
TYP.
C A B
0.10 M
Dimensions in mm.
Package Style: QFN, 32-Pin, 5x5
NOT FOR NEW DESIGNS
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