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ADF4116/ADF4117/ADF4118

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2000

RF PLL Frequency Synthesizers

FEATURES

ADF4116: 550 MHz

ADF4117: 1.2 GHz

ADF4118: 3.0 GHz

2.7 V to 5.5 V Power Supply

Systems

Selected Charge Pump Currents

Dual Modulus Prescaler

ADF4116: 8/9

ADF4117/ADF4118: 32/33

3-Wire Serial Interface

Digital Lock Detect

Power-Down Mode

Fast Lock Mode

APPLICATIONS

Base Stations for Wireless Radio (GSM, PCS, DCS,

CDMA, WCDMA)

Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)

Wireless LANS

Communications Test Equipment

CATV Equipment

GENERAL DESCRIPTION

The ADF4116 family of frequency synthesizers can be used

to implement local oscillators in the up-conversion and down-

conversion sections of wireless receivers and transmitters. They

consist of a low-noise digital PFD (Phase Frequency Detector),

a precision charge pump, a programmable reference divider,

programmable A and B counters and a dual-modulus prescaler

(P/P+1). The A (5-bit) and B (13-bit) counters, in conjunction

with the dual modulus prescaler (P/P+1), implement an N

divider (N = BP+A). In addition, the 14-bit reference counter

(R Counter), allows selectable REFIN frequencies at the PFD

input. A complete PLL (Phase-Locked Loop) can be imple-

mented 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.

The devices operate with a power supply ranging from 2.7 V to

5.5 V and can be powered down when not in use.

FUNCTIONAL BLOCK DIAGRAM

REFERENCE

SWITCH

N = BP + A

FUNCTION

LATCH

PRESCALER

P/P +1

13-BIT

B COUNTER

5-BIT

A COUNTER

14-BIT

R COUNTER

21-BIT

INPUT REGISTER

R COUNTER

LATCH

A, B COUNTER

LATCH

PHASE

FREQUENCY

DETECTOR

CHARGE

PUMP

M3

M2

M1

HIGH Z

MUX

MUXOUT

CP

18

13

14

19

FROM

FUNCTION LATCH

5

DGND

AGND

CE

LE

DATA

CLK

CPGND

LOCK

DETECT

ADF4116/ADF4117/ADF4118

LOAD

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