PDF DK2051 Data sheet ( Hoja de datos )

Número de pieza	DK2051
Descripción	HIGH PERFORMANCE WIDEBAND RF PLL/VCO
Fabricantes	RF Micro Devices
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RF2051RF2051 HIGH PERFORMANCE WIDEBAND RF PLL/VCO WITH INTEGRATED RF MIXERS Package: QFN, 32-Pin, 5mmx5mm 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 VCO LO divider Synth Frac-N sequence generator Charge pump N divider Phase / freq detector Mux LO divider Ref divider Functional Block Diagram Product Description 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. 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 DS140110 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. 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 1 of 39 1 page RF2051 Parameter Mixer 1/2, cont. IIP3 Low Current Setting High Linearity Setting Pin1dB Low Current Setting High Linearity Setting RF and IF Port Frequency Range Mixer Input Return Loss Voltage Controlled Oscillator Open Loop Phase Noise at 1MHz Offset 2GHz LO Frequency 1GHz LO Frequency 500MHz LO Frequency Reference Oscillator Xtal Frequency External Reference Frequency Reference Divider Ratio External Reference Input Level Local Oscillator Synthesizer Output Frequency Phase Detector Frequency Closed Loop Phase-Noise at 10kHz Offset 2GHz LO Frequency 1GHz LO Frequency 500MHz LO Frequency Specification Min. Typ. Max. +10 +18 +2 +12 30 2500 10 -130 -135 -140 10 52 10 104 17 500 800 1500 300 2400 52 -90 -95 -102 Unit Condition dBm dBm dBm dBm MHz dB 100 differential dBc/Hz dBc/Hz dBc/Hz MHz MHz mVP-P AC-coupled MHz MHz dBc/Hz dBc/Hz dBc/Hz Dependant on VCO 3 external inductor. After LO dividers. 26MHz phase detector frequency DS140110 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 5 of 39 5 Page RF2051 Detailed Description The RF2051 is a wideband RF frequency converter chip which includes a fractional-N phase-locked loop, a crystal oscillator cir- cuit, a low noise VCO core, a LO signal multiplexer, two buffer circuits and two RF mixers. Synthesizer programming, device con- figuration and control are achieved through a mixture of hardware and software controls. All on-chip registers are programmed through a simple three-wire serial interface. VCO The VCO core in the RF2051 consists of three VCOs which, in conjunction with the integrated 2/4 LO divider, cover the LO range from 300MHz to 2400MHz. VCO Tank Inductor VCO Frequency Range DIV 2 1 Internal 1800MHz to 2400MHz 900MHz to 1200MHz 2 Internal 1500MHz to 2100MHz 750MHz to 1050MHz 3 External 1200MHz to 1600MHz* 600MHz to 800MHz *The frequency of VCO3 is set by external inductors and can be varied by the user. DIV 4 450MHz to 600MHz 375MHz to 525MHz 300MHz to 400MHz VCO 1, 2, and 3 are selected using the PLL1x0:P1_VCOSEL and PLL2x0:P2_VCOSEL control words. Each VCO has 128 overlap- ping bands to achieve an acceptable VCO gain (20MHz/V nom) and hence a good phase noise performance across the whole tuning range. The chip automatically selects the correct VCO band ("VCO coarse tuning") to generate the desired LO frequency based on the values programmed into the PLL1 and PLL2 registers banks. For information on how to program the desired LO frequency into the PLL1 and PLL2 banks refer to page 12. The automatic VCO band selection is triggered every time the ENBL pin is taken high. Once the band has been selected the PLL will lock onto the correct frequency. During the band selection process fixed capacitance elements are progressively connected to the VCO resonant circuit until the VCO is oscillating at approximately the correct frequency. The output of this band selection is made available in the RB1:CT_CAL read-back register. A value of 127 or 0 in this register indicates that the selection was unsuccessful, this is usually due to the wrong VCO being selected so the user is trying to program a frequency that is outside of the VCO operating range. A value between 1 and 126 indicates a successful calibration, the actual value being dependent on the desired frequency as well as process variation for a particular device. The band selection takes approximately 1500 cycles of the phase detector clock (about 50us with a 26MHz clock). The band select process will center the VCO tuning voltage at about 1.2V, compensating for manufacturing tolerances and process variation as well as environmental factors including tem- perature. For applications where the synthesizer is always on and the LO frequency is fixed, the synthesizer will maintain lock over a +/-60°C temperature range. However it is recommended to re-initiate an automatic band selection for every 30 degrees change in temperature in order to maintain optimal synthesizer performance. This assumes an active loop filter. If start-up time is a critical parameter, and the user is always programming the same frequency for the PLL, the calibration result may be read back from the RB1:CT_CAL register, and written to the PLL1x2:P1_CT_DEF or PLL2x2:P2_CT_DEF registers (depending on desired PLL register bank). The calibration function must then be disabled by setting the PLL1x0:P1_CT_EN and/or PLL2x0:P2_CT_EN control words to 0. For further information please refer to the RF205x Calibration User Guide. When operating using VCO1 for frequencies above 2.2GHz, it is recommended to change the coarse tuning voltage setting, PLL1x5:P1_CT_V and PLL2x5:P2_CT_V, from the default value of 16 down to 12. The LO divide ratio is set by the PLL1x0:P1_LODIV and PLL2x0:P2_LODIV control words. The LO is routed to mixer1, mixer2, or both depending on the state of the MODE pin and the value of CFG1:FULLD. The current in the VCO core can be programmed using the PLL1x3:P1_VCOI or PLL2x3:P2_VCOI control words. This allows opti- mization of VCO performance for a particular frequency. For applications where the required LO frequency is above 2GHz it is recommended that the LO buffer current be increased by setting CFG5:LO1_I and CFG5:LO2_I to 1100 (hex value C). DS140110 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 11 of 39 11 Page

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