PDF RFFC2071 Data sheet ( Hoja de datos )

Número de pieza	RFFC2071
Descripción	2.7GHz RF SYNTHESIZER/VCO
Fabricantes	RF Micro Devices
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No Preview Available ! RFFC2071 RFFC2071/2072 2.7GHz RF SYNTHESIZER/VCO WITH INTEGRATED RF MIXER Package: QFN, 32-Pin, 5mm x 5mm RFFC2072 Features  85MHz to 2700MHz LO Frequency Range  Fractional-N Synthesizer with Very Low Spurious Levels  Typical Step Size 1.5Hz  Fully Integrated Low Phase Noise VCO and LO Buffers  Integrated Phase Noise 0.18°rms at 1GHz  High Linearity RF Mixer(s)  30MHz to 2700MHz Mixer Frequency Range  Input IP3 +23dBm  Mixer Bias Adjustable for Low Power Operation  Full Duplex Mode (RFFC2071)  2.7V to 3.3V Power Supply  Low Current Consumption  3- or 4-Wire Serial Interface Applications  CATV Head-Ends  Digital TV Repeaters  Multi-Dwelling Units  Diversity Receivers  Software Defined Radios  Frequency Band Shifters  Point-to-Point Radios  Cellular Repeaters  WiMax/LTE Infrastructure  Cellular Jammers  Satellite Communications  VHF/UHF Radios Phase det. Synth Ref. divider Phase det. Synth Ref. divider Functional Block Diagram Product Description The RFFC2071 and RFFC2072 are re-configurable frequency conversion devices with integrated fractional-N phased locked loop (PLL) synthesizer, voltage con- trolled oscillator (VCO) and either one or two high linearity mixers. The fractional-N synthesizer takes advantage of an advanced sigma-delta modulator that delivers ultra-fine step sizes and low spurious products. The PLL/VCO engine combined with an external loop filter allows the user to generate local oscillator (LO) signals from 85MHz to 2700MHz. The LO signal is buffered and routed to the integrated RF mix- ers which are used to up/down-convert frequencies ranging from 30MHz to 2700MHz. The mixer bias current is programmable and can be reduced for applica- tions requiring lower power consumption. Both devices can be configured to work as signal sources by bypassing the integrated mixers. Device programming is achieved via a simple 3-wire serial interface. In addition, a unique programming mode allows up to four devices to be controlled from a common serial bus. This eliminates 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. Both devices operate with a 2.7V to 3.3V power supply. Optimum Technology Matching® Applied GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT BiFET HBT LDMOS 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. ©2012, 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 23 1 page RFFC2071/2072 Theory of Operation The RFFC2071 and RFFC2072 are wideband RF frequency converter chips which include a fractional-N synthesizer and a low noise VCO core. The RFFC2071 has an LO signal multiplexer, two LO buffer circuits, and two RF mixers. The RFFC2072 has a single LO buffer circuit and one RF mixer. Both devices have an integrated voltage reference and low drop out regulators sup- plying critical circuit blocks such as the VCOs and synthesizer. Synthesizer programming, device configuration and control are achieved through a mixture of hardware and software controls. All on-chip registers are programmed through a simple 3-wire serial interface. VCO The VCO core in the RFFC2071 and RFFC2072 consists of three VCOs which, in conjunction with the integrated LO dividers of /2 to /32, cover the LO range of 85MHz to 2700MHz. Each VCO has 128 overlapping bands which are used to achieve low VCO gain and optimal phase noise performance across the whole tuning range. The chip automatically selects the correct VCO (VCO auto-select) and VCO band (VCO coarse tuning) to generate the desired LO frequency based on the values programmed into the PLL1 and PLL2 registers banks. The VCO auto-select and VCO coarse tuning are triggered every time ENBL is taken high, or if the PLL re-lock self clearing bit is programmed high. Once the correct VCO and band have 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 approximately at the correct frequency. The output of this band selection, CT_CAL, is made available in the read- back register. A value of 127 or 0 in this register indicates that the coarse tuning was unsuccessful, and this will also be indi- cated by the CT_FAILED flag also available in the read-back register. A CT_CAL value between 1 and 126 indicates a success- ful calibration, the actual value being dependent on the desired frequency as well as process variation for a particular device. The band select process will center the VCO tuning voltage at about 1.0V, compensating for manufacturing tolerances and pro- cess variation as well as environmental factors including temperature. In applications where the device is left enabled at the same LO frequency for some time, it is recommended that automatic band selection be performed for every 30°C change in temperature. This assumes an active loop filter. The RFFC2071 and RFFC2072 feature a differential LO input to allow the mixer to be driven from an external LO source. The fractional-N PLL can be used with an external VCO driven into this LO input, which may be useful to reduce phase noise in some applications. This may also require an external op-amp, dependant on the tuning voltage required by the external VCO. In the RFFC2071 the LO signal is routed to mixer 1, mixer 2, or both mixers depending on the state of the MODE pin (or MODE bit if under software control) and the value of the FULLD bit. Setting FULLD high puts the device into Full Duplex mode and both mixers are enabled. Fractional-N PLL The RFFC2071 and RFFC2072 contain a charge pump-based fractional-N phase locked loop (PLL) for controlling the three VCOs. The PLL includes automatic calibration systems to counteract the effects of process and environmental variations, ensuring repeatable loop response and phase noise performance. As well as the VCO auto-select and coarse tuning, there is a loop filter calibration mechanism which can be enabled if required. This operates by adjusting the charge pump current to maintain loop bandwidth. This can be useful for applications where the LO is tuned over a wide frequency range. The PLL has been designed to use a reference frequency of between 10MHz and 104MHz from an external source, which is typically a temperature controlled crystal oscillator (TCXO). A reference divider (divide by 1 to divide by 7) is supplied and should be programmed to limit the frequency at the phase detector to a maximum of 52MHz. Two PLL programming banks are provided, the first bank is preceded by the label PLL1 and the second bank is preceded by the label PLL2. For the RFFC2071 these banks are used to program mixer 1 and mixer 2 respectively, and are selected automati- cally as the mixer is selected using MODE. For the RFFC2072 mixer 2 and register bank PLL2 are normally used. The VCO outputs are first divided down in a high frequency prescalar. The output of this high frequency prescalar then enters the N divider, which is a fractional divider containing a dual-modulus prescaler and a digitally spur-compensated fractional 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 23 5 Page Loop Filter Control Lines 3-Wire Serial Bus MODE ENBL RESET ENX SDATA SCLK RFFC2071/2072 Detailed Functional Block Diagram +3V OP2 Ext LO RFXF8553 4:1 Balun RFXF9503 1:1 Balun IP2 Mixer 2 Pre- scaler Sequence generator N divider Phase detector /2n [n=1..5] Reference divider Mixer 1 +3V 51K +3V OP1 GPO Lock Flag XO RFXF9503 1:1 Balun RFXF8553 4:1 Balun IP1 RFFC2071 Only 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 23 11 Page

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