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ADF4251

Part Number	ADF4251
Manufacturer	Analog Devices
Description	Dual Fractional-N/Integer-N Frequency Synthesizer
Published	Jan 12, 2007
Detailed Description	www.DataSheet4U.com Dual Fractional-N/Integer-N Frequency Synthesizer ADF4251 FEATURES 3.0 GHz Fractional-N/1.2 GHz Int...
Datasheet	ADF4251 PDF File

Overview

www.
DataSheet4U.
com Dual Fractional-N/Integer-N Frequency Synthesizer ADF4251 FEATURES 3.
0 GHz Fractional-N/1.
2 GHz Integer-N 2.
7 V to 3.
3 V Power Supply Separate V P Allows Extended Tuning Voltage to 5 V Programmable Dual Modulus Prescaler RF: 4/5, 8/9 IF: 8/9, 16/17, 32/33, 64/65 Programmable Charge Pump Currents 3-Wire Serial Interface Digital Lock Detect Power-Down Mode Programmable Modulus on Fractional-N Synthesizer Trade-Off Noise versus Spurious Performance Software and Hardware Power-Down APPLICATIONS Base Stations for Mobile Radio (GSM, PCS, DCS, CDMA, WCDMA) Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA, PHS) Wireless LANs Communications Test Equipment CATV Equipment GENERAL DESCRIPTION The ADF4251 is a dual fractional-N/integer-N frequency synthesizer that can be used to implement local oscillators (LO) in the upconversion and downconversion sections of wireless receivers and transmitters.
Both the RF and IF synthesizers consist of a low noise digital PFD (phase frequency...

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