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Optimum Technology Matching® Applied

GaAs HBT

InGaP HBT

GaAs MESFET

SiGe BiCMOS

Si BiCMOS

SiGe HBT

GaAs pHEMT

Si CMOS

Si BJT

GaN HEMT

Functional Block Diagram

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.

Product Description

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

RF MEMS



LO

divider

LO

divider

Frac-N

sequence

generator

N divider

Phase /

freq

detector

Charge

pump

Ref

divider

VCO

Synth

Mux

RF2051

HIGH PERFORMANCE WIDEBAND RF PLL/VCO WITH

INTEGRATED RF MIXERS

The RF2051 is a low power, high performance, wideband RF frequency conversion

chip with integrated local oscillator (LO) generation and a pair of RF mixers. The RF

synthesizer includes an integrated fractional-N phase locked loop with voltage con-

trolled oscillators (VCOs) and dividers to produce a low-phase noise LO signal with a

very fine frequency resolution. The buffered LO output drives the built-in RF mixers

which convert the signal into the required frequency band. The mixer bias current

can be programmed dependent on the required performance and available supply

current. The LO generation blocks have been designed to continuously cover the

frequency range from 300MHz to 2400MHz. The RF mixers are very broad band

and operate from 30MHz to 2500MHz at the input and output, enabling both up

and down conversion. An external crystal of between 10MHz and 52MHz or an

external reference source of between 10MHz and 104MHz can be used with the

RF2051 to accommodate a variety of reference frequency options.

All on-chip registers are controlled through a simple three-wire serial interface. The

RF2051 is designed for 2.7V to 3.6V operation for compatibility with portable, bat-

tery powered devices. It is available in a plastic 32-pin, 5mmx5mm QFN package.

Features



30MHz to 2.5GHz Frequency

Range



Fractional-N Synthesizer



Very Fine Frequency Resolution

1.5Hz for 26MHz Reference



Low Phase Noise VCO



On-Chip Crystal-Sustaining

Circuit With Programmable

Loading Capacitors



Two High-Linearity RF Mixers



Integrated LO Buffers



Mixer Input IP3 +18dBm



Mixer Bias Adjustable for Low

Power Operation



Full Duplex Mode



2.7V to 3.6V Power Supply



Low Current Consumption

55mA to 75mA at 3V



3-Wire Serial Interface

Applications



CATV Head-Ends



Digital TV Up/Down Converters



Digital TV Repeaters



Multi-Dwelling Units



Cellular Repeaters



Frequency Band Shifters



UHF/VHF Radios



Diversity Receivers



Software Defined Radios



Satellite Communications



Super-Heterodyne Radios

DS140110

Package: QFN, 32-Pin, 5mmx5mm

RF2051