Microwave Wideband Synthesizer

with Integrated VCO

Data Sheet

ADF4355

Rev. A

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FEATURES

RF output frequency range: 54 MHz to 6800 MHz

Fractional-N synthesizer and integer-N synthesizer

High resolution 38-bit modulus

Low phase noise, voltage controlled oscillator (VCO)

Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output

Analog and digital power supplies: 3.3 V

Charge pump and VCO power supplies: 5.0 V typical

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

APPLICATIONS

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

PCS, DCS, DECT)

Point to point/point to multipoint microwave links

Satellites/VSATs

Test equipment/instrumentation

Clock generation

GENERAL DESCRIPTION

The ADF4355 allows implementation of fractional-N or

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

when used with an external loop filter and an external reference

frequency. A series of frequency dividers permits operation

from 54 MHz to 6800 MHz.

The ADF4355 has an integrated VCO with a fundamental

output frequency ranging from 3400 MHz to 6800 MHz. In

addition, the VCO frequency is connected to divide by 1, 2, 4, 8,

16, 32, or 64 circuits that allow the user to generate radio frequency

(RF) output frequencies as low as 54 MHz. For applications that

require isolation, the RF output stage can be muted. The mute

function is both pin and software controllable.

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

The ADF4355 operates with analog and digital power supplies

ranging from 3.15 V to 3.45 V, with charge pump and VCO

supplies from 4.75 V to 5.25 V. The ADF4355 also contains

hardware and software power-down modes.

FUNCTIONAL BLOCK DIAGRAM

MUXOUT

CLK

DATA

LE

AV

DD

CE

VCO

CORE

PHASE

COMPARATOR

CHARGE

PUMP

OUTPUT

STAGE

OUTPUT

STAGE

MULTIPLEXER

10-BIT R

COUNTER

÷2

DIVIDER

×2

DOUBLER

FUNCTION

LATCH

DATA REGISTER

INTEGER

REGISTER

N COUNTER

FRACTION

THIRD-ORDER

FRACTIONAL

INTERPOLATOR

MODULUS

MULTIPLEXER

LOCK

DETECT

÷1/2/4/8

16/32/64

ADF4355

B

REGISTER

REGISTER

Figure 1.