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PDF RF2498 Data sheet ( Hoja de datos )
| Número de pieza | RF2498 | |
| Descripción | TRI-BAND/QUAD-MODE CDMA/GPS LOW NOISE AMPLIFIER/MIXER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Typical Applications
• CDMA/Cellular/PCS/GPS Handsets
• JCDMA/GPS Handsets
• CDMA Modem/Data Cards
RF2498
TRI-BAND/QUAD-MODE CDMA/GPS
LOW NOISE AMPLIFIER/MIXER
• Commercial and Consumer Systems
• Portable Battery-Powered Equipment
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.
Optimum Technology Matching® Applied
Si BJT
GaAs HBT
GaAs MESFET
Si Bi-CMOS
InGaP/HBT
SiGe HBT
Si CMOS
9GaN HEMT
SiGe Bi-CMOS
32 31 30 29 28 27 26 25
GPS+ 1
24 GPS LNA IN
GPS- 2
23 PCS LNA IN
CDMA+ 3
22 IP SET
CDMA- 4
21 PCS LNA OUT
FM+ 5
20 CELL LNA IN
FM- 6
19 CELL LNA EMITTER
VCC2 7
18 CELL LNA OUT
LO IN 8
9
17 LNA GAIN
10 11 12 13 14 15 16
Functional Block Diagram
-A-
5.00 SQ.
0.10 C A
2 PLCS
2.50 TYP
0.10 C B
2 PLCS
0.90
0.85
0.05
0.00
0.05 C
0.70
0.65
Dimensions in mm.
0.10 C B
2 PLCS
0.10 C A
2 PLCS
4.75 SQ.
-B-
2.37 TYP
NOTES:
1. Shaded lead is Pin 1.
2 Dimension applies to plated terminal:
to be measured between 0.20 mm and 0.25 mm
from terminal end.
0.60
0.24
TYP
12°
MAX
SEATING
PLANE
-C-
0.10 M C A B
0.30
0.18 2
PIN 1 ID
0.20 R
3.25
2.95
SQ.
0.50
0.30
0.50
Package Style: QFN, 32-Pin, 5x5
Features
• GPS Receive Front-End Gain=37dB
• Meets IMD Tests with Three Gain
States/Two Logic Control Lines
• Adjustable Mixer and LNA Bias Current
• Selectable Divide-by-2 Prescaler
• 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
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A3 030711
8-301
1 page  
RF2498
Parameter
Specification
Min.
Typ.
Max.
Unit
TX (Local Oscillator)
Buffer
Cellular - CDMA/FM/JCDMA
Output Power
-11 -8
dBm
Output Frequency
600
1078
MHz
Output Power
-11 -6.5
Output Frequency
1200
2156
MHz
Current Consumption
2 mA
PCS
Output Power
-11 -8
dBm
Output Frequency
1600
2300
MHz
Current Consumption
2 mA
NOTE 1. Mixer performance can be changed with external IF load/tuning.
NOTE 2. Specifications apply for conditions of LO Divider enabled or disabled.
NOTE 3. LO Divider disabled. LO Divider disabled logic conditions:
A) BAND SELECT=1; /2 SELECT=Immaterial.B) BAND SELECT=0; /2 SELECT=1
NOTE 4. LO Divider enabled. LO Divider enabled logic conditions:
A) BAND SELECT=0; /2 SELECT=0
Condition
Single-ended 50Ω load
See note 3. High and Low Side LO Injection.
Single-ended 50Ω load
See note 4. High and Low Side LO Injection.
Single-ended 50Ω load
High and Low Side LO Injection
Rev A3 030711
8-305
5 Page 
Pin Function Type Description
28 GPS MIX IN AI GPS mixer RF single-end input.
RF2498
Interface Schematic
GPS MIX IN
29
30
31
32
Pkg
Base
Legend:
VCC1
ISET1
ISET2
ISET3
GND
P DC supply for internal reference, logic control, cellular mixer
preamp, and GPS mixer preamp (PCS mixer preamp has its’
own DC supply, PCS_RFA_VCC). External bypass capacitor
between 1nF and 47nF required.
AO Resistor for internal voltage reference setting. Recommended
value 5.1kΩ.
AO Resistor to ground sets the LNA current in boost mode (all
three LNAs). Higher resistance results in lower current.
AO Resistor to ground sets preamp and mixer currents in all
bands. Higher resistance results in lower currents.
P Ground connection. The backside of the package should be
soldered to a top side ground pad which is connected to the
ground plane with multiple vias.
DI=Digital Input from Baseband Chip
AI=Analog Input
AO=Analog Output
P=VCC or GND
ISET Pins
ISET1 sets the internal reference voltage for the bias control circuits to all functional blocks. An external resistor of 5.1kΩ
to ground is required. We do not recommend adjusting this resistor value. This resistor is pulled out to allow for a higher
precision off chip value and not as a significant tuning adjustment.
ISET2 sets the DC current through the LNAs in all bands when IPSET is high. Higher resistance to ground results in
lower current through the LNA. Increasing the LNA current will improve the IIP3 of the LNA and slightly increase gain in
all modes. NF typically will get worse as you increase current. Increasing the LNA current in one mode, i.e. Cellular, will
also increase the LNA current for the high IPSET state for PCS and the GPS LNAs as well.
ISET3 sets the DC current through the mixer and mixer preamplifier for all bands. Higher resistance to ground results in
lower current. Lower current will improve mixer NF but will degrade IIP3. Mixer and the mixer preamp gain is not signifi-
cantly changed with current.
Rev A3 030711
8-311
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet RF2498.PDF ] | |
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