RF2485 Ver la hoja de datos (PDF) - RF Micro Devices
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RF2485 Datasheet PDF : 8 Pages
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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
0.156
0.010
0.148
.018
0.004
.014
5
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,
0.347
0.339
0.050
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
0.252
0.236
0.059
0.057
accomplished with monolithic construction, is used to full
advantage to obtain excellent amplitude balance and high
8° MAX
0° MIN
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
0.0500
0.0164
0.010
0.007
part as specified.
Optimum Technology Matching® Applied
Si BJT
ü GaAs HBT
GaAs MESFET
Si Bi-CMOS
SiGe HBT
Si CMOS
Package Style: SOIC-14
Features
• Single 5V Power Supply
VDD2 1
VDD1 2
NC 3
POWER
CONTROL
I SIG 4
14 RF OUT
13 GND2
12 GND
11 GND
• Low Power
• Excellent Amplitude and Phase Balance
• Extremely Low Broadband Noise Floor
• 200MHz to 600MHz Operation
I REF 5
Q REF 6
Q SIG 7
10 GND1
Σ
+45°
-45°
9 PHASE
8 LO IN
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
Rev A3 010820
5-55
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