RFMD2081 Datasheet, PDF (1/18 Pages) RF Micro Devices – 45MHz TO 2700MHz IQ MODULATOR WITH SYNTHESIZER/VCO

RFMD2081
RFMD2081
45MHz TO 2700MHz IQ MODULATOR
WITH SYNTHESIZER/VCO
Package: QFN, 32-Pin, 5mm x 5mm
Features
 RF Output Frequency Range
45MHz to 2700MHz
 Fractional-N Synthesizer with
Very Low Spurious Levels
 Typical Step Size 1.5Hz
 Fully Integrated Wideband VCOs
and LO Buffers
 Integrated Phase Noise
<0.2° rms at 1GHz
 -40dBc Unadjusted Carrier
Suppression
 -40dBc Unadjusted Sideband
Suppression
 100MHz Baseband Input 3dB
Bandwidth
 Very Low Noise Floor
-162dBm/Hz Typical
 Output P1dB + 4dBm
 Output IP3 + 17dBm
 2.7V to 3.3V Power Supply
 135mA Typical Current
Consumption
 Serial Programming Interface
Applications
 Satellite Communications
 QPSK/QAM Modulators
 Wireless Broadband
 Point-to-Point
 Software Defined Radios
Phase
det .
Synth
Ref.
divider
Functional Block Diagram
Product Description
The RFMD2081 is a low power, wideband, IQ modulator with integrated fractional-N synthesizer
and voltage controlled oscillator (VCO). The modulator features an input 3dB bandwidth of
100MHz, and can generate output frequencies of between 45MHz and 2700MHz, making it
suitable for a wide range of applications.
The fractional-N synthesizer takes advantage of an advanced sigma-delta architecture that
delivers ultra-fine step sizes and low spurious products. The synthesizer/VCO, combined with
an external loop filter, allows the user to generate local oscillator (LO) signals from 90MHz to
5400MHz. The LO signal is buffered and routed to a high accuracy quadrature divider (/2) that
drives the balanced I and Q mixers. The output of the mixers are summed and applied to a dif-
ferential RF output stage. This device also features a differential input for an external VCO or LO
source.
Device programming is achieved via a simple 3-wire serial interface. In addition, a unique pro-
gramming mode allows up to four devices to be controlled from a common serial bus. This elim-
inates the need for separate chip-select control lines between each device and the host
controller. Up to six general purpose outputs are provided, which can be used to access internal
signals (the LOCK signal, for example) or to control front end components. The device is opti-
mized for low power operation, consuming typically only 135mA from a 3V supply.
DS140110
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
RF MEMS
LDMOS
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. ©2011, RF Micro Devices, Inc.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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