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PDF RF2485 Data sheet ( Hoja de datos )
| Número de pieza | RF2485 | |
| Descripción | VHF QUADRATURE MODULATOR | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Preliminary
5
RF2485
VHF QUADRATURE MODULATOR
Typical Applications
• Digital and Spread-Spectrum Systems
• AM, SSB, DSB Modulation
• GMSK, QPSK, DQPSK, QAM Modulation • Image-Reject Upconverters
• Private Mobile Radio and TETRA systems
Product Description
The RF2485 is a monolithic integrated universal modula-
tion system capable of generating modulated AM, PM, or
compound carriers in the VHF and UHF frequency range.
The IC contains all of the required components to imple-
ment the modulation function including differential amplifi-
ers for the baseband inputs, a 90° hybrid phase splitter,
limiting LO amplifiers, two balanced mixers, a combining
amplifier, and an output RF amplifier which will drive a
50Ω load. Component matching, which can only be
accomplished with monolithic construction, is used to full
advantage to obtain excellent amplitude balance and high
phase accuracy. The unit features low power consump-
tion, single power supply operation and adjustment free
operation with no external parts required to operate the
part as specified.
Optimum Technology Matching® Applied
Si BJT
üGaAs HBT
GaAs MESFET
Si Bi-CMOS
SiGe HBT
Si CMOS
VDD2 1
VDD1 2
NC 3
POWER
CONTROL
I SIG 4
I REF 5
Q REF 6
Σ
Q SIG 7
14 RF OUT
13 GND2
12 GND
11 GND
10 GND1
+45°
-45°
9 PHASE
8 LO IN
0.156
0.148
.018
.014
0.347
0.339
0.050
0.010
0.004
0.252
0.236
8° MAX
0° MIN
0.0500
0.0164
0.059
0.057
0.010
0.007
Package Style: SOIC-14
Features
• Single 5V Power Supply
• Low Power
• Excellent Amplitude and Phase Balance
• Extremely Low Broadband Noise Floor
• 200MHz to 600MHz Operation
Ordering Information
RF2485
VHF Quadrature Modulator
RF2485 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
5
Rev A3 010820
5-55
1 page  
Preliminary
Application Schematic
RF2485
VDD
I INPUT
ZIN=100
VREF
Q INPUT
ZIN=100
1
100 nF
100 pF
2
Coupling Capacitor
NC 3
POWER
CONTROL
100 Ω
100 Ω
100 Ω
100 Ω
4
5
6
7
Σ
Coupling Capacitor
NOTE A: Optional; input impedance is about 79-J158 Ω at 400 MHz
without resistor. SMD resistor mounted adjacent to package pin,
grounded through a via to the ground plane.
100 pF
14
13
12
11
+45°
-45°
10
9
8
100 pF
56 Ω
Note A
50 Ω µstrip
50 Ω µstrip
RF OUTPUT
LO INPUT
5
Rev A3 010820
5-59
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet RF2485.PDF ] | |
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