PDF RF2053 Data sheet ( Hoja de datos )

Número de pieza	RF2053
Descripción	HIGH PERFORMANCE FRACTIONAL-N SYNTHESIZER
Fabricantes	RFMD
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RF2053RF2053 HIGH PERFORMANCE FRACTIONAL-N SYNTHESIZER WITH INTEGRATED RF MIXER Package: QFN, 32-Pin, 5mmx5mm Features  Fractional-N Synthesizer  Very Fine Frequency Resolution 1.5Hz for 26MHz Reference  300MHz to 2400MHz External VCO Frequency Range  On-Chip Crystal-Sustaining Circuit With Programmable Loading Capacitors  Integrated LO Buffer and LO Divider  High-Linearity RF Mixer  Mixer Input IP3 +23dBm Typ.  Mixer Bias Adjustable for Low Power Operation  Mixer Frequency Range 30MHz to 2500MHz  2.7V to 3.6V Power Supply  Low Current Consumption 50mA to 70mA at 3V  3-Wire Serial Interface Applications  CATV Head-Ends  Digital TV Up/Down Converters  Digital TV Repeaters  Multi-Dwelling Units  Frequency Band Shifters  UHF/VHF Radios  Software Defined Radios  Satellite Communications  Super-Heterodyne Radios LO divider Synth Frac-N sequence generator Charge pump N divider Phase / freq detector Ref divider Functional Block Diagram Product Description The RF2053 is a low power, high performance, wideband RF frequency conversion chip with integrated local oscillator (LO) generation and RF mixer. The RF synthe- sizer includes an integrated fractional-N phase locked loop that can control an external VCO to produce a low-phase noise LO signal with a very fine frequency res- olution. The VCO output frequency can be divided by 1, 2, or 4 in the LO divider, whose output is buffered and drives the built-in RF mixer which converts 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 gen- eration blocks have been designed to operate with external VCOs covering the fre- quency range from 300MHz to 2400MHz. The RF mixer is very broad band and operates 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 RF2053 to accommodate a variety of reference frequency options. All on-chip registers are controlled through a simple three-wire serial interface. The RF2053 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 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. ©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 36 1 page RF2053 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 Differential Input External VCO Input Frequency External VCO Input Level 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 1kHz Offset 2GHz LO Frequency 1GHz LO Frequency 500MHz LO Frequency Closed Loop Phase-Noise at 10kHz Offset 2GHz LO Frequency 1GHz LO Frequency 500MHz LO Frequency Charge Pump Charge Pump Current Charge Pump Output Voltage Specification Min. Typ. Max. 30 300 -6 10 10 1 500 75 +0.7 +12 +23 +2 +12 10 -3 800 -85 -91 -97 -90 -95 -102 120 +1.1 2500 2400 0 52 104 7 1500 2400 52 240 +1.5 Unit Condition dBm dBm dBm dBm MHz dB 100 differential MHz dBm MHz MHz mVP-P AC-coupled MHz MHz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz At LO divider output 26MHz phase detector frequency 26MHz phase detector frequency A V 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 36 5 Page RF2053 Crystal Oscillator The PLL may be used with an external reference source, or its own crystal oscillator. If an external source (such as a TCXO) is being used it should be AC-coupled into one of the XO inputs, and the other input should be AC-coupled to ground. A crystal oscillator typically takes many milliseconds to settle, and so for applications requiring rapid pulsed operation of the PLL (such as a TDMA system, or Rx/Tx half-duplex system) it is necessary to keep the XO running between bursts. However, when the PLL is used less frequently, it is desirable to turn off the XO to minimize current draw. The REFSTBY register is pro- vided to allow for either mode of operation. If REFSTBY is programmed high, the XO will continue to run even when ENBL is asserted low. Thus the XO will be stable and a clock is immediately available when ENBL is asserted high, allowing the chip to assume normal operation. On cold start, or if REFSTBY is programmed low, the XO will need a warm-up period before it can pro- vide a stable clock. The length of this warm-up period will be dependant on the crystal characteristics. The crystal oscillator circuit contains internal loading capacitors. No external loading capacitors are required, dependant on the crystal loading specification. The internal loading capacitors are a combination of fixed capacitance, and an array of switched capacitors. The switched capacitors can be used to tune the crystal oscillator onto the required center frequency and minimize frequency error. The PCB stray capacitance and oscillator input and output capacitance will also contribute to the crystal’s total load capacitance. The register settings in the CFG4 register for the switched capacitors are as follows: • Coarse Tune XO_CT (4 bits) 150.55pF, default 0100 • Fine Step XO_CR_S (1 bit) 10.25pF, default 0 The on chip fixed capacitance is approximately 4.2pF. Wideband Mixer The RF2053 includes a wideband, double-balanced Gilbert cell mixer. It supports RF/IF frequencies of 30MHz to 2500MHz. The mixer has an input port and an output port that can be used for either IF or RF, i.e. for up conversion or down conversion. The mixer current can be programmed to between 15mA and 35mA depending on linearity requirements, using the MIX- 2_IDD<3:0> word in the CFG2 register. The majority of the mixer current is sourced through the output pins via either a centre- tapped balun or an RF choke in the external matching circuitry to the supply. The RF mixer input and output ports are differential and require simple matching circuits optimized to the specific application frequencies. A conversion gain of approximately -3dB to 0dB is achieved with 100 differential input impedance, and the out- puts driving 200 differential load impedance. Increasing the mixer output load increases the conversion gain. The mixer has a broadband common gate input. The input impedance is dominated by the resistance set by the mixer 1/gm term, which is inversely proportional to the mixer current setting. The resistance will be approximately 85 at the default mixer current setting (100). There is also some shunt capacitance at the mixer input, and the inductance of the bond wires to con- sider at higher frequencies. The mixer output is high impedance, consisting of a resistance of approximately 2k in parallel with some capacitance. The mixer output does not need to be matched as such, just to see a resistive load. A higher resistance load will give higher output voltage and gain. A shunt inductor can be used to resonate with the mixer output capacitance at the frequency of interest. This inductor may not be required at lower frequencies where the impedance of the output capacitance is less significant. At higher output frequencies the inductance of the bond wires becomes more significant. For more information about the mixer port impedances and matching, please refer to the RF205x Family Application Note on Matching Circuits and Baluns. 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 36 11 Page

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