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RF2948B fiches techniques PDF

RF Micro Devices - 2.4GHz SPREAD-SPECTRUM TRANSCEIVER

Numéro de référence RF2948B
Description 2.4GHz SPREAD-SPECTRUM TRANSCEIVER
Fabricant RF Micro Devices 
Logo RF Micro Devices 





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RF2948B fiche technique
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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-
sisting of the RF2494 LNA/Mixer, one of the many RFMD
high-efficiency GaAs HBT PA’s and the RF3000 Base-
band Processor.
2 PLCS
-A-
5.00 SQ.
0.10 C A
2.50 TYP.
3 2 PLCS
0.10 C B
0.05 C
0.90
0.85
0.70
0.65
0.05
0.00
2 PLCS
0.10 C B
-B-
2 PLCS
0.10 C A
4.75 SQ.
2.37 TYP.
Shaded lead is pin 1.
0.60
0.24
TYP.
Dimensions in mm.
0.50
0.30
12°
MAX
-C-
0.10 M C A B
0.30 2
0.18
Pin 1 ID
R.20
3.45
3.15
SQ.
0.50
SEATING
PLANE
Optimum Technology Matching® Applied
Si BJT
9Si Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
InGaP/HBT
GaN HEMT
SiGe Bi-CMOS
PD 1
RX EN 2
RX IF BIAS 3
VCC1 4
RX IF IN 5
TX IF IN 6
VCC9 7
TX VGC 8
32 31
30
29
BW
Control
Logic
REF
÷2
Phase
Splitter
9
10 11 12
13
28 27
26
25
DC
Feedback
gm-C
LPF
DC
Feedback
gm-C
LPF
TX
Bias
Σ
14 15 16
24 I OUT
23 VCC4
gm-C
LPF
22 TXQ DATA
21 TXQ BP
gm-C
LPF
20 TXI DATA
19 TXI BP
18 IF1 OUT+
17 IF1 OUT-
Functional Block Diagram
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
Ordering Information
RF2948B
2.4GHz Spread-Spectrum Transceiver
RF2948BTR13 2.4GHz Spread-Spectrum Transceiver (Tape & Reel)
RF2948B PCBA Fully Assembled Evaluation Board
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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