Data Sheets   Rev 0, 10/2003 (pdf, 446K) Email PDF      Lead(Pb) - Free Data (Data Sheet Help)     Application Notes Evaluation Boards Price, Packaging, and Availability

	Product Description
	The ADF4251 Fractional-N Synthesizer when combined with a VCO and loop filter forms a complete phased locked loop (PLL). This solution from ADI creates state-of-the-art LO's (local oscillator) for...More

Specifications Type Dual Fractional-N Max RF Input (MHz) 3000MHz Norm Phase Noise (dBc/Hz) 103dBc Max REFin (MHz) 150MHz RF Prescalers 4/5, 8/9 Supply Current (max) 13mA Package 24-Lead CSP Find Similar Products

Functional Block Diagram Symbols and Footprints

Features Sigma-delta based fractional-N technology ensures superior Phase Noise and spurious performance is maintained over temperature Hardware and Software Power-Down Flexibility of programmable fractional-modulus ensures exact output frequencies can be synthesized. 0.1 - 3.0GHz Fractional-N / 0.05 - 1.2GHz Integer-N PLL's 3 wire Serial Interface with 1.8V logic compatibility 250MHz REFin Frequency 8 x Programmable charge pump currents PFD frequencies up to 30MHz allow faster settling and lower phase noise. Supported on ADIsimPLL software design tool Available in 4x4mm Chipscale package 2.7 - 3.3V Power Supply with separate Vp to 5V

 

Design Tools Evaluation Boards for PLL Synthesizers PLL Register Configuration   ADF4110/ADF4111/ADF4112/ADF4113   ADF4210/ADF4211/ADF4212/ADF4213   ADF4153/ADF4154/ADF4251/ADF4252 - BETA This tool assists you in programming the four 24-bit registers within the ADF4110/11/12/13 and ADF4106/07. By selecting your desired configuration (through pull-down menus and checkboxes) you will generate the hex values for the registers. This tool also calculates the charge pump current based on Rset, or Rset based on the maximum desired charge pump current.

 

Price, Packaging, and Availability Print Table ADF4251 Model Options Model Status Package Pins Temp Range Price* (100-499) Available RoHS Compliant Samples Cart Purchase Cart ADF4251BCP Obs 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind - - N Material Declaration Contact ADI Contact ADI ADF4251BCP-REEL Obs 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind - - N Material Declaration Contact ADI Contact ADI ADF4251BCP-REEL7 Obs 24 ld LFCSP (4x4mm w/2.10mm EP) 24 Ind - - N Material Declaration Contact ADI Contact ADI The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing. View Sales and Distribution Offices

 

 

Find Similar Products     Part# Type Max RF Input (MHz) Output Frequency Range Norm Phase Noise (dBc/Hz) Max REFin (MHz) RF Prescalers Supply Current (max) Prog Supply Current (mA) Programmable Output Power Package Price* (1000 pcs.) ADF4251 Dual Fractional-N 3000 - 103 150 4/5; 8/9 13 - - 24-Lead CSP ** ADF4252 Dual Fractional-N 3000 - -214 150 4/5; 8/9 12 - - 24-Lead CSP $2.67 * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing. ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.