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ADF4251

Features: ·3.0 GHz Fractional-N/1.2 GHz Integer-N·2.7 V to 3.3 V Power Supply·Separate VP 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 Mod...

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SeekIC No. : 004274737 Detail

ADF4251: Features: ·3.0 GHz Fractional-N/1.2 GHz Integer-N·2.7 V to 3.3 V Power Supply·Separate VP Allows Extended Tuning Voltage to 5 V·Programmable Dual Modulus Prescaler·RF: 4/5, 8/9·IF: 8/9, 16/17, 32/33...

ADF4251 Data Sheet

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Part Number:
ADF4251
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

·3.0 GHz Fractional-N/1.2 GHz Integer-N
·2.7 V to 3.3 V Power Supply
·Separate VP 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




Application

 ·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


Pinout

Connection Diagram


Specifications

VDD1, VDD2, VDD3, DVDD to GND3 . . . . . . . .    0.3 V to +4 V
REFIN, RFINA, RFINB to GND . . . . . .       0.3 V to VDD + 0.3 V
VP1, VP2 to GND . . . . . . . . . . . . . . . . . . . . .   0.3 V to +5.8 V
VP1, VP2 to VDD1 . . . . . . . . . . . . . . . . . . . .   3.3 V to +3.5 V
Digital I/O Voltage to GND . . . . . . . .     0.3 V to VDD + 0.3 V
Analog I/O Voltage to GND . . . . . . . .    0.3 V to VDD + 0.3 V
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . . .     40°C to +85°C
Storage Temperature Range . . . . . . . . . . . 65°C to +150°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . .  150°C
LFCSP JA Thermal Impedance . . . . . . . . . . . . . . . . 122°C/W
Soldering Reflow Temperature
Vapor Phase (60 sec max) . . . . . . . . . . . . . . . . . . . . .  240°C
IR Reflow (20 sec max) . . . . . . . . . . . . . . . . . . . . . . .   240°C


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 detector), a precision charge pump, and a programmable reference divider. The RF synthesizer has a - based fractional interpolator that allows programmable fractional-N division.

The IF synthesizer of ADF4251 has programmable integer-N counters. A complete PLL (phase-locked loop) can be implemented if the synthesizer is used with an external loop filter and VCO (voltage controlled oscillator).

Control of all the on-chip registers is via a simple 3-wire interface. ADF4251 operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use.




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