5-55
5
Preliminary
Product Description
Ordering Information
Typical Applications
Features
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
Optimum Technology Matching® Applied
Si BJT
GaAs MESFET
GaAs HBT
Si Bi-CMOS
ü
SiGe HBT
Si CMOS
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VDD2
VDD1
NC
ISIG
IREF
QREF
QSIG
RF OUT
GND2
GND
GND
GND1
PHASE
LO IN
POWER
CONTROL
Σ
+45°
-45°
RF2485
VHF QUADRATURE MODULATOR
• Digital and Spread-Spectrum Systems
• GMSK, QPSK, DQPSK, QAM Modulation
• Private Mobile Radio and TETRA systems
• AM, SSB, DSB Modulation
• Image-Reject Upconverters
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
50
Ω 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.
• Single 5V Power Supply
•Low Power
• Excellent Amplitude and Phase Balance
• Extremely Low Broadband Noise Floor
• 200MHz to 600MHz Operation
RF2485
VHF Quadrature Modulator
RF2485 PCBA
Fully Assembled Evaluation Board
5
Rev A3 010820
0.156
0.148
0.059
0.057
0.252
0.236
0.010
0.004
.018
.014
8° MAX
0° MIN
0.0500
0.0164
0.010
0.007
0.347
0.339
0.050
Package Style: SOIC-14
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