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RF2948BPCBA Datasheet

  • RF2948BPCBA

  • 2.4GHz SPREAD-SPECTRUM TRANSCEIVER

  • 18頁

  • RFMD

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RF2948B
0
Typical Applications
鈥?IEEE 802.11b WLANs
鈥?Wireless Residential Gateways
鈥?Secure Communication Links
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鈥檚 and the RF3000 Base-
band Processor.
Optimum Technology Matching廬 Applied
Si BJT
Si Bi-CMOS
InGaP/HBT
GaAs HBT
SiGe HBT
GaN HEMT
Si CMOS
2.4GHz SPREAD-SPECTRUM TRANSCEIVER
鈥?High Speed Digital Links
鈥?Wireless Security
鈥?Digital Cordless Telephones
IG
N
S
-A-
5.00 SQ.
2.50 TYP.
3
2 PLCS
0.10 C A
0.05 C
0.90
0.85
0.70
0.65
2 PLCS
0.10 C B
0.05
0.00
2 PLCS
0.10 C B
12擄
MAX
E
S
-B-
-C-
2.37 TYP.
4.75 SQ.
0.10 M C A B
0.60
0.24
TYP.
0.30
0.18
2
SEATING
PLANE
2 PLCS
0.10 C A
D
Shaded lead is pin 1.
Pin 1 ID
R.20
Dimensions in mm.
W
3.45
SQ.
3.15
0.50
0.30
N
E
0.50
Package Style: QFN, 32-Pin, 5x5
GaAs MESFET
SiGe Bi-CMOS
Features
鈥?45MHz to 500MHz IF Quad Demod
鈥?On-Chip Variable Baseband Filters
鈥?Quadrature Modulator and Upconverter
鈥?2.7V to 3.6V Operation
鈥?Part of IEEE802.11b Chipset
FO
BW CTRL
RX VGC
VREF 1
32
31
30
VCC2
29
BW
Control
R
DCFB Q
28
DC
Feedback
gm-C
LPF
gm-C
LPF
VREF1 BUF
DCFB I
27
26
25
PD 1
N
O
T
RX EN 2
Logic
RX IF BIAS 3
REF
DC
Feedback
Q OUT
鈥?2.4GHz PA Driver
24 I OUT
TX
Bias
VCC1 4
RX IF IN 5
23 VCC4
TX IF IN 6
gm-C
LPF
22 TXQ DATA
VCC9 7
21 TXQ BP
Ordering Information
RF2948B
RF2948BTR13
RF2948B PCBA
2.4GHz Spread-Spectrum Transceiver
2.4GHz Spread-Spectrum Transceiver (Tape & Reel)
Fully Assembled Evaluation Board
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
危
TX VGC 8
梅2
Phase
Splitter
gm-C
LPF
20 TXI DATA
19 TXI BP
18 IF1 OUT+
17 IF1 OUT-
9
IF LO
10
VCC8
11
VCC6
12
PA OUT
13
PA IN
14
VCC5
15
RF LO
16
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
NOT FOR NEW DESIGNS
Rev A6 040930
RF OUT
11-239

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