Integer-N/Fractional-N PLL Synthesizer

Data Sheet

ADF4155

FEATURES

Input frequency range: 500 MHz to 8000 MHz

Fractional-N synthesizer and integer-N synthesizer

Phase frequency detector (PFD) up to 125 MHz

High resolution 38-bit modulus

voltage in 5 V systems

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

Differential and single-ended reference inputs

Power supply: 3.3 V ± 5%

Logic compatibility: 1.8 V

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

Programmable output power level

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

Test equipment

Wireless LANs, CATV equipment

Clock generation

GENERAL DESCRIPTION

The ADF4155 allows implementation of fractional-N or

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

when used with an external loop filter, external voltage

controlled oscillator (VCO), and external reference frequency.

The ADF4155 is for use with external VCO parts up to an

8 GHz operating frequency. The high resolution programmable

modulus allows synthesis of exact frequencies with 0 Hz error.

The VCO frequency can be divided by 1, 2, 4, 8, 16, 32, or 64 to

allow the user to generate RF output frequencies as low as

7.8125 MHz.

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

interface. The device operates with a nominal power supply of

3.3 V ± 5% and can be powered down when not in use.

The ADF4155 is available in a 24-lead, 4 mm × 4 mm LFCSP

package.

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

MUXOUT

CLK

DATA

LE

CE

PHASE

COMPARATOR

CHARGE

PUMP

OUTPUT

STAGE

INPUT

STAGE

10-BIT R

COUNTER

÷2

DIVIDER

×2

DOUBLER

FUNCTION

LATCH

DATA REGISTER

INTEGER

REG

N COUNTER

FRACTION

REG

THIRD-ORDER

FRACTIONAL

INTERPOLATOR

MODULUS

REG

MULTIPLEXER

LOCK

DETECT

÷ 1/2/4/8/16/32/64

ADF4155

–

Rev. 0

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