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ADF4158 Datasheet(PDF) 1 Page - Analog Devices |
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ADF4158 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 36 page  Direct Modulation/Waveform Generating, 6.1 GHz Fractional-N Frequency Synthesizer ADF4158 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved. FEATURES RF bandwidth to 6.1 GHz 25-bit fixed modulus allows subhertz frequency resolution Frequency and phase modulation capability Sawtooth and triangular waveforms in the frequency domain Parabolic ramp Ramp superimposed with FSK Ramp with 2 different sweep rates Ramp delay Ramp frequency readback Ramp interruption 2.7 V to 3.3 V power supply Separate VP allows extended tuning voltage Programmable charge pump currents 3-wire serial interface Digital lock detect Power-down mode Cycle slip reduction for faster lock times Switched bandwidth fast-lock mode APPLICATIONS FMCW radar Communications test equipment GENERAL DESCRIPTION The ADF4158 is a 6.1 GHz, fractional-N frequency synthesizer with modulation and waveform generation capability. It con- tains a 25-bit fixed modulus, allowing subhertz resolution at 6.1 GHz. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a sigma-delta (Σ-Δ) based fractional interpolator to allow programmable fractional-N division. The INT and FRAC registers define an overall N-divider as N = INT + (FRAC/225). The ADF4158 can be used to implement frequency shift keying (FSK) and phase shift keying (PSK) modulation. There are also a number of frequency sweep modes available, which generate various waveforms in the frequency domain, for example, sawtooth and triangular waveforms. The ADF4158 features cycle slip reduction circuitry, which leads to faster lock times, without the need for modifications to the loop filter. Control of all on-chip registers is via a simple 3-wire inter- face. The device operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use. FUNCTIONAL BLOCK DIAGRAM LOCK DETECT N-COUNTER CP SW1 REFERENCE DATA LE TXDATA CE 32-BIT DATA REGISTER CLK REFIN AVDD AGND VDD VDD DGND RDIV NDIV DGND CPGND DVDD VP RSET RFINA RFINB OUTPUT MUX – + HIGH-Z PHASE FREQUENCY DETECTOR ADF4158 THIRD-ORDER FRACTIONAL INTERPOLATOR MODULUS 225 FRACTION REG INTEGER REG CSR ×2 DOUBLER 5-BIT R-COUNTER ÷2 DIVIDER CHARGE PUMP MUXOUT FLO SWITCH SW2 Figure 1. |
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