RF2938
2
Typical Applications
鈥?Wireless LANs
鈥?Wireless Local Loop
鈥?Secure Communication Links
鈥?Inventory Tracking
鈥?Wireless Security
鈥?Digital Cordless Telephones
2.4GHZ SPREAD-SPECTRUM TRANSCEIVER
Product Description
The RF2938 is a monolithic integrated circuit specifically
designed for direct-sequence spread-spectrum systems
operating in the 2.4GHz ISM band. The part includes a
direct conversion from IF receiver, quadrature demodula-
tor, I/Q baseband amplifiers with gain control and RSSI,
on-chip programmable baseband filters, dual data com-
parators. 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 maximum) battery applications are supported by
the part. The part is also designed to be part of a 2.4GHz
chip set consisting of the RF2444 LNA/Mixer and one of
the many RFMD high efficiency GaAs HBT PA鈥檚 and a
dual frequency synthesizer.
Optimum Technology Matching廬 Applied
Si BJT
GaAs HBT
SiGe HBT
BW CTRL
RX VGC
DCFB Q
VREF 1
VREF 2
VCC2
VCC3
NC
9.00
+ 0.20
0.10
0.00
-A-
0.50
9.00
+ 0.10
4.57
+ 0.10 sq.
0.22
+ 0.05
7.00
+ 0.10 sq.
Dimensions in mm
7擄 MAX
0擄 MIN
1.00
+ 0.10
0.60
+ 0.15
0.10
Exposed pad protrusion
0.0000 to 0.0127 (see note 4).
0.17 MAX.
NOTES:
1. Shaded lead is Pin 1.
2. Lead coplanarity - 0.08 with respect to datum "A".
3. Leadframe material: EFTEC 64T copper or equivalent, 0.127 mm (0.005) thick.
4. Solder plating (85/15) on exposed area.
Package Style: TQFP-48 EDF, 9x9
眉
Si Bi-CMOS
NC
48
NC
NC
PD
RX EN
TX EN
VCC1
RX IF IN
TX IF IN
VCC9
TX VGC
IF LO
VCC8
1
2
3
RX
4
47
46
GaAs MESFET
Si CMOS
DCFB I
RSSI
NC
Features
鈥?45MHz to 500MHz IF Quad Demod
36
35
34
33
NC
NC
RXQ DATA
Q OUT
RXI DATA
I OUT
VCC4
TXQ DATA
TXQ BP
TXI DATA
TXI BP
IF1 OUT+
11
TRANSCEIVERS
45
44
43
42
41
40
39
38
37
鈥?On-Chip Variable Baseband Filters
鈥?Quadrature Modulator and Upconverter
鈥?2.7V to 3.6V Operation
鈥?Part of 2.4GHz Radio Chipset
鈥?2.4GHz PA Driver
I
5
Q
32
31
30
29
I
6
7
8
9
10
11
12
13
NC
14
RF OUT
15
RF OUT
16
VCC6
17
NC
18
PA IN
19
NC
20
VCC5
21
RF LO
22
RF OUT
23
IF1 OUT-
24
NC
螔2
+45擄
-45擄
RX_EN
TX_EN
TX
Q
28
27
26
25
危
Ordering Information
RF2938TR13
RF2938 PCBA
2.4GHz Spread-Spectrum Transceiver (Tape & Reel)
Fully Assembled Evaluation Board
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
Rev A8 010418
2-1