adf4351 Analog Devices, Inc., adf4351 Datasheet

adf4351

Manufacturer Part Number

adf4351

Description

Wideband Synthesizer With Integrated Vco Preliminary Technical Data Adf4351

Manufacturer

Analog Devices, Inc.

Datasheet

1.ADF4351.pdf (28 pages)

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FEATURES

Output frequency range: 35 MHz to 4400 MHz

Fractional-N synthesizer and integer-N synthesizer

Low phase noise VCO

Programmable divide-by-1/-2/-4/-8/-16/-32/-64 output

Typical rms jitter: 0.3 ps rms

Typical EVM at 2.1 GHz: 0.4%

Power supply: 3.0 V to 3.6 V

Logic compatibility: 1.8 V

Programmable dual-modulus prescaler of 4/5 or 8/9

Programmable output power level

RF output mute function

3-wire serial interface

Analog and digital lock detect

Switched bandwidth fast-lock mode

Cycle slip reduction

APPLICATIONS

Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX,

Test equipment

Wireless LANs, CATV equipment

Clock generation

Rev. PrC

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Preliminary Technical Data

GSM, PCS, DCS, DECT)

REF

DATA

CLK

DOUBLER

×2

DATA REGISTER

N COUNTER

INTEGER

REG

AGND

SDV

COUNTER

FRACTION

10-BIT R

REG

INTERPOLATOR

THIRD-ORDER

FRACTIONAL

DGND

MODULUS

DIVIDER

Wideband Synthesizer with Integrated VCO

REG

÷2

FUNCTION

FUNCTIONAL BLOCK DIAGRAM

LATCH

GND

DETECT

LOCK

COMPARATOR

Figure 1.

PHASE

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

GENERAL DESCRIPTION

The ADF4351 allows implementation of fractional-N or

integer-N phase-locked loop (PLL) frequency synthesizers

if used with an external loop filter and external reference

frequency.

The ADF4351 has an integrated voltage controlled oscillator

(VCO) with a fundamental output frequency ranging from

2200 MHz to 4400 MHz. In addition, divide-by-1/2/4/8/16/32

or 64 circuits allow the user to generate RF output frequencies

as low as 35 MHz. For applications that require isolation, the RF

output stage can be muted. The mute function is both pin- and

software-controllable. An auxiliary RF output is also available,

which can be powered down if not in use.

Control of all the on-chip registers is through a simple 3-wire

interface. The device operates with a power supply ranging

from 3.0 V to 3.6 V and can be powered down when not in use.

MULTIPLEXER

CORE

CHARGE

VCO

SET

PUMP

÷ 1/2/4/8/16

VCO

/32/64

GND

GNDVCO

SWITCH

ADF4351

OUTPUT

STAGE

MUXOUT

TEMP

PDB

TUNE

REF

COM

ADF4351

OUT

www.analog.com

A+

A–

B+

B–

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