PDF RF2056 Data sheet ( Hoja de datos )

Número de pieza	RF2056
Descripción	HIGH PERFORMANCE VHF/UHF PLL AND VCO
Fabricantes	RFMD
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RF2056High Performance VHF/UHF PLL and VCO with Integrated Mix- ers RF2056 HIGH PERFORMANCE VHF/UHF PLL AND VCO WITH INTEGRATED MIXERS Package: QFN, 32-Pin, 5mmx5mm Features  Fractional-N Synthesizer  Very Fine Frequency Resolution 1.5Hz for 26MHz Reference  LO Frequency Range Between 50MHz and 500MHz  Low Phase Noise VCO  VCO Range 200MHz to 500MHz Dependent on External Inductor  Integrated LO Buffers and LO Dividers  On-Chip Crystal-Sustaining Circuit With Programmable Loading Capacitors  Two High-Linearity RF Mixers  Mixer Frequency Range 30MHz to 500MHz  Mixer Input IP3 +25dBm  Mixer Bias Adjustable for Low Power Operation  2.7V to 3.6V Power Supply  Low Current Consumption 45mA to 65mA at 3V  3-Wire Serial Interface Applications  VHF/UHF Radios  Super-Heterodyne Radios  Diversity Receivers  Wireless Telemetry  PMR  Marine Radios VCO LO divider Synth Frac-N sequence generator Charge pump Ref divider N divider Phase / freq detector Sw LO divider Functional Block Diagram Product Description The RF2056 is a low power, high performance, VHF/UHF frequency conversion chip with integrated local oscillator (LO) generation and a pair of mixers. The synthesizer includes an integrated fractional-N phase locked loop that can control the VCO to produce a low phase noise and low spurious LO signal with very fine frequency res- olution. The V CO output can then be divided by one, two, or four in the LO divider, the output of which drives the mixer, which converts the signal into the required fre- quency band. The mi xer bias curren t can be pr ogrammed depe ndent on the required pe rformance an d available su pply cu rrent. T he LO generation block has been designed to operate with the VCO covering the frequency range from 200MHz to 500 MHz, dependant on the value of th e e xternal in ductor used. With the L O dividers, the L O rang e a chievable is w ithin the range of 50 MHz to 500 MHz. The mixer is broadband and can operate from 30 MHz to 500 MHz at the input and out- put, enabling both up and down conversion. An external crystal of between 10MHz and 26MHz, or an external reference source of between 10MHz and 104MHz, can be used with the RF2056 to accommodate a variety of reference frequency options. All on-chip registers are controlled through a simple three-wire serial interface. The RF2056 is designed for 2.7V to 3.6V operation. It is available in a plastic 32-pin, 5mmx5m m 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 DS130807 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]. http://www.Datasheet4U.com 1 of 40 1 page RF2056 Parameter Mixer, 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 VCO Frequency Range Inductor Value 16nH (2) Inductor Value 24nH (2) Inductor Value 33nH (2) Inductor Value 47nH (2) Inductor Value 68nH (2) Open Loop Phase-Noise at 1MHz Offset 500MHz LO Frequency 200MHz 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 400MHz LO Frequency 200MHz LO Frequency 100MHz LO Frequency Specification Min. Typ. Max. +10 +25 +2 +12 30 500 10 400 500 320 400 280 320 240 280 200 240 -139 -144 10 26 10 104 17 500 800 1500 50 500 52 -100 -107 -113 Unit Condition dBm dBm dBm dBm MHz dB MHz MHz MHz MHz MHz 100 differential Dependant on differential inductor. dBc/Hz dBc/Hz LO divider=1, 16nH (2) VCO Inductor LO divider=1, 68nH (2) VCO Inductor MHz MHz mVP-P AC-coupled MHz MHz dBc/Hz dBc/Hz dBc/Hz At LO divider output, dependant on VCO differ- ential inductor used. 26MHz phase detector frequency and 16nH (2) VCO inductor. LO divider=1 LO divider=2 LO divider=4 DS130807 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 5 of 40 5 Page RF2056 Detailed Description The RF2056 is a VHF/UHF frequency converter chip that includes a fractional-N phase locked loop, a crystal oscillator circuit, a low noise VCO core, an LO signal multiplexer, two LO 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 RF2056 consists of one VCO which covers a frequency range between 200MHz and 500MHz, dependant on the value of the external inductor used. In conjunction with the integrated 2/4 divider frequencies down to 50 MHz can be generated. The following table gives examples of the LO frequency ranges possible versus the inductor value fitted. Note that the VCO inductor is dif ferential so the value given is the induct ance on e ach device pin, and the t otal differential inductance will be twice this value. Inductor Value 16nH 24nH 33 nH 47nH 68 nH LO Div=1 400MHz to 500MHz 320MHz to 400MHz 280MHz to 320MHz 240MHz to 280MHz 200MHz to 240MHz LO Div=2 200MHz to 250MHz 160MHz to 200MHz 140MHz to 160MHz 120MHz to 140MHz 100MHz to 120MHz LO Div=4 100MHz to 125MHz 80MHz to 100MHz 70MHz to 80MHz 60MHz to 70MHz 50MHz to 60MHz VCO3 must be selected using the PLL1x0:P1_VCOSEL and PLL2x0:P2_VCOSEL control word and setting 10 for VCO3. The VCO has 128 overlapping bands to achieve an acceptable VCO gain (MHz/V) and hence a go od phase noise performance across the whole tuning range. The chip aut omatically selects the correct VCO band (VCO coarse tuning) to generate the desired fre- quency based on the values programmed into the PLL1 and PLL2 register banks. For information on how to program the desired LO frequency into the PLL1 and PLL2 banks, refer to the next section. 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 th is band selection is made available in th e 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 se lected so the user is tr ying to program a frequency that is out side o f the V CO o perating ra nge. A value between one and 126 indicates a successful calibration, the actual value being dependent on the desired frequency, as well as process v ariation. The band selec tion takes approximately 1500 cy cles of the p hase detector clo ck (about 50 us with a 26MHz clock). The band select process will center the VCO tuning voltage at about 1.2V, compensating for manufacturing tol- erances and process variation, as well as environmental factors, including temperature. For applications where the synthesizer is always on and the L O 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 of temperature change in order to maintain opti- mal 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 writ- ten to PLL1x2:P1_CT_DEF or PLL2x2:P2_CT_DEF registers (depending on the desired PLL register bank). The calibration func- tion must the n be disabled by settin g the PLL1x0:P1_CT_EN and/or PLL 2x0:P2_CT_EN c ontrol wo rds to 0 . F or f urther information, please refer to the RF205x Calibration User Guide. For the RF2056, the values of the N divider used in the PLL are typically below 28. In order for the VCO band selection to be successful, it is necessary to set CFG3:FLL_FACT=00. 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. DS130807 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 11 of 40 11 Page

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