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PDF RF2484 Data sheet ( Hoja de datos )
| Número de pieza | RF2484 | |
| Descripción | DIRECT QUADRATURE MODULATOR | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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RF2484Direct
Quadrature
Modulator
RF2484
DIRECT QUADRATURE MODULATOR
RoHS Compliant & Pb-Free Product
Package Style: QFN, 16-pin, 4x4
Features
Typical Carrier
Suppression>35dBc, Side-
band Suppression>35dBc
over temperature with highly
linear operation
Noise Floor better than -
152dBm/Hz from 800MHz to
2200 MHz
Single 5V Power Supply
Applications
Dual-Band CDMA Base Sta-
tions
TDMA/TDMA-EDGE Base Sta-
tions
GSM-EDGE/EGSM Base Sta-
tions
W-CDMA Base Stations
WLAN and WLL Systems
GMSK,QPSK,DQPSK,QAM
Modulation
1 16 15 14 13
GND 2
GND 3
12 GND
11 GND
LO 4
5
-45°
+45°
67
10 VCC
89
Functional Block Diagram
Product Description
The RF2484 is a monolithic integrated quadrature modulator IC capable
of universal direct modulation for high-frequency AM, PM, or compound
carriers. This low-cost IC features excellent linearity, noise floor, and
over-temperature carrier suppression performance. The device imple-
ments differential amplifiers for the modulation inputs, 90° carrier phase
shift network, carrier limiting amplifiers, two matched double-balanced
mixers, summing amplifier, and an output RF amplifier which will drive
50 from 800MHz to 2500MHz. It is packaged in a small industry-stan-
dard QFN 16-pin plastic package.
Ordering Information
RF2484
Direct Quadrature Modulator
RF2484PCBA-410 Fully Assembled Evaluation Board
DS121024
Optimum Technology Matching® Applied
GaAs HBT
SiGe BiCMOS
GaAs pHEMT
GaN HEMT
GaAs MESFET
Si BiCMOS
Si CMOS
InGaP HBT
SiGe HBT
Si BJT
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
1 of 12
1 page  
RF2484
Pin Function Description
Interface Schematic
1
GND
Ground connection. This pin should be connected directly to the ground
plane.
2
GND
Same as pin 1.
3
GND
Same as pin 1.
4 LO The input of the phase shifting network. This pin has an internal DC block-
ing capacitor. This port is voltage-driven so matching at different frequen-
cies is generally not required.
LO
5
GND
Same as pin 1.
6
VCC
Power supply. An external capacitor is needed if no other low frequency
bypass capacitor is nearby.
7 PD Power Down control. When this pin is "low," all circuits are shut off. A "low"
is typically 1.2V or less at room temperature.When this pin is "high" (VCC),
all circuits are operating normally. If PD is below VCC, output power and
performance will be degraded. Operating in this region is not recom-
2 0 0
PD
VCC
mended, although it might be useful in some applications where power
control is required.
8
RF OUT
RF Output. This pin has an internal DC blocking capacitor. At some frequen-
cies, external matching may be needed to optimize output power. A small
amount of DC current may be present at this output. As a result, if the volt-
age at this pin is measured using a high impedance probe, some DC volt-
age may be observed at this output.
RF OUT
9
GND
Same as pin 1.
10
VCC
Same as pin 6.
11
GND
Same as pin 1.
12
GND
Same as pin 1.
13
Q SIG
Baseband input to the Q mixer. This pin is DC coupled. The input drive level
determines output power and linearity performance; for better carrier sup-
pression, sideband suppression, and dynamic range, the drive level should
be as high as possible to meet the required linearity performance. The rec-
ommended DC level for this pin is 4.1V.
For optimum carrier suppression, the DC voltages on I REF, Q REF, I SIG
and Q SIG should be adjusted slightly to compensate for inherent unde-
sired internal DC offsets; for optimum sideband suppression, phase and
signal amplitude on IREF, Q REF, I SIG and Q SIG should be adjusted
slightly to compensate for inherent undesired internal offsets. See RFMD
AN0001 for more detail.
14
I SIG
Baseband input to the I mixer. This pin is DC coupled. The input drive level
determines output power and linearity performance; for better carrier sup-
pression, sideband suppression, and dynamic range, the drive level should
be as high as possible to meet the required linearity performance. The rec-
ommended DC level for this pin is 4.1V; see pin 13 for more information.
15
I REF
Reference voltage for the I mixer. This voltage should be the same as the
DC voltage supplied to the I SIG pin. A voltage of 4.1V is recommended;
see pin 13 for more information.
The SIG and REF inputs are inputs of a differential amplifier. Therefore the
REF and SIG inputs are interchangeable. If swapping the I SIG and I REF
pins, the Q SIG and Q REF also need to be swapped to maintain the correct
phase. It is also possible to drive the SIG and REF inputs in a differential
mode. This will increase the gain.
1 0 0
1p
V CC
1 0 0
1p
V CC
1 0 0
1p
V CC
DS121024
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
5 of 12
5 Page 
RF2484
RF2484 Cellular CDMA Spectra at Various Output Levels
(ACPR @ 885kHz, Vcc = 5.0V, Vref = 4.1V, T = 25°C)
-20
-30
-40
Note: Below ~-90dBm,
-50 test setup noise inhibits accurate
ACP measurement.
-60
-70
-80
CP = -9.5 dBm;
ACPR = -68 dBc
CP = -10.6 dBm;
ACPR = -70 dBc
CP = -12.0 dBm;
ACPR = -72 dBc
CP = -14.7 dBm;
ACPR = -73 dBc
-90
-100
877.5 878 878.5 879 879.5 880 880.5 881 881.5 882 882.5
Frequency (MHz)
RF2484 Output Power versus I, Q Input Voltage Level
(Vcc = 5.0V, Vref = 4.1V, T = 25°C, Single Sideband)
5
RF2484 PCS CDMA Spectra at Various Output Levels
(ACPR @ 885 kHz, Vcc = 5.0V, Vref = 4.1V, T = 25°C)
-20
-30
-40
CP = -11.1 dBm;
-50 ACPR = -71 dBc
CP = -12.9 dBm;
ACPR = -72 dBc
-60
CP = -14.3 dBm;
ACPR = -73 dBc
-70
-80
-90
-100
1957.5 1958 1958.5 1959 1959.5 1960 1960.5 1961 1961.5 1962 1962.5
Frequency (MHz)
RF2484 Output Channel Power vs I, Q Input Voltage Level
(Vcc = 5.0V, Vref = 4.1V, T = 25°C, CDMA/W-CDMA Mod.)
-5
0 -10
-5 -15
-10 -20 880 MHz CDMA Signal
880 MHz
1960 MHz CDMA Signal
1960 MHz
-15
2140 MHz
-25
2140 MHz W-CDMA Signal
-20
0
200 400 600 800 1000 1200 1400 1600
I, Q Input Voltage Level (mVp)
-30
250 500 750 1000 1250 1500 1750 2000 2250 2500
I, Q Input Voltage Level (mVpp)
DS121024
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or [email protected].
11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RF2484.PDF ] | |
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