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RF2498_07 Datasheet

  • RF2498_07

  • TRI-BAND/QUAD-MODE CDMA/GPS LOW NOISE AMPLIFIER/MIXER

  • 682.98KB

  • 20頁

  • RFMD

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RF2498
0
Typical Applications
鈥?CDMA/Cellular/PCS/GPS Handsets
鈥?JCDMA/GPS Handsets
鈥?CDMA Modem/Data Cards
Product Description
The RF2498 is a high performance CDMA tri-band/quad-
mode integrated LNA/mixer with GPS capability. The
device is designed to meet all IS-98 sensitivity, intermod-
ulation and single-tone requirements. The RF2498 inte-
grates the tri-band LNA/downconverters with 27.5dB of
gain control for the cellular band and 29dB for the PCS
band. The RF2498 is designed for three state gain control
solutions for IS-98 IMD testing. The device offers a dedi-
cated GPS LNA/mixer with 37dB of gain. Additionally, a
divide-by-2 prescaler to allow the use of either a single- or
dual-band VCO is integrated. There is also a TX LO
buffer. The design is flexible, in that the bias currents may
be set using off-chip current reference resistors for the
mixer and LNA blocks. The device is packaged in a plas-
tic, 5mmx5mm, leadless chip carrier.
TRI-BAND/QUAD-MODE CDMA/GPS
LOW NOISE AMPLIFIER/MIXER
鈥?Commercial and Consumer Systems
鈥?Portable Battery-Powered Equipment
N
E
GaAs MESFET
Si CMOS
SiGe Bi-CMOS
GPS LNA OUT
IF SEL
26
25
24 GPS LNA IN
23 PCS LNA IN
22 IP SET
21 PCS LNA OUT
20 CELL LNA IN
19 CELL LNA EMITTER
18 CELL LNA OUT
W
Package Style: QFN, 32-Pin, 5x5
Optimum Technology Matching廬 Applied
Si BJT
Si Bi-CMOS
InGaP/HBT
GaAs HBT
SiGe HBT
GaN HEMT
R
FO
GPS MIX IN
BAND SEL
ISET3
ISET2
ISET1
VCC1
32
31
30
29
28
27
GPS+ 1
N
O
T
GPS- 2
CDMA+ 3
CDMA- 4
FM+ 5
/2
FM- 6
VCC2 7
D
Features
鈥?GPS Receive Front-End Gain=37dB
鈥?Meets IMD Tests with Three Gain
States/Two Logic Control Lines
鈥?Adjustable Mixer and LNA Bias Current
鈥?Selectable Divide-by-2 Prescaler
鈥?Integrated TX LO Buffer Amplifier
Ordering Information
RF2498
RF2498 PCBA
Tri-Band/Quad-Mode CDMA/GPS Low Noise Ampli-
fier/Mixer
Fully Assembled Evaluation Board
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
LO IN 8
9
LO OUT
10
/2 SELECT
11
TX BUFF ENABLE
12
PCS RFA VCC
13
PCS MIX IN
14
CELL MIX IN
15
MIX GAIN
16
ENABLE
17 LNA GAIN
Functional Block Diagram
NOT FOR NEW DESIGNS
Rev A4 070308
E
S
IG
N
S
8-301

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