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ADF4218

Description
Dual RF PLL Frequency Synthesizers
File Size217KB,20 Pages
ManufacturerADI
Websitehttps://www.analog.com
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ADF4218 Overview

Dual RF PLL Frequency Synthesizers

a
FEATURES
ADF4216: 550 MHz/1.2 GHz
ADF4217: 550 MHz/2.0 GHz
ADF4218: 550 MHz/2.5 GHz
2.7 V to 5.5 V Power Supply
Selectable Charge Pump Currents
Selectable Dual Modulus Prescaler
IF: 8/9 or 16/17
RF: 32/33 or 64/65
3-Wire Serial Interface
Power-Down Mode
Dual RF PLL Frequency Synthesizers
ADF4216/ADF4217/ADF4218
GENERAL DESCRIPTION
APPLICATIONS
Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)
Base Stations for Wireless Radio (GSM, PCS, DCS,
CDMA, WCDMA)
Wireless LANS
Communications Test Equipment
CATV Equipment
The ADF4216/ADF4217/ADF4218 are dual frequency synthe-
sizers that can be used to implement local oscillators (LOs) in
the upconversion and downconversion sections of wireless
receivers and transmitters. They can provide the LO for both
the RF and IF sections. They consist of a low-noise digital PFD
(Phase Frequency Detector), a precision charge pump, a pro-
grammable reference divider, programmable A and B counters,
and a dual-modulus prescaler (P/P+1). The A (6-bit) and B
(11-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 implemented if the synthesizers are
used with an external loop filter and VCOs (Voltage Con-
trolled Oscillators).
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
V
DD
1
V
DD
2
V
P
1
V
P
2
N = BP + A
11-BIT IF
B-COUNTER
IF
IN
A
IF
IN
B
IF
PRESCALER
6-BIT IF
A-COUNTER
ADF4216/ADF4217/ADF4218
PHASE
COMPARATOR
CHARGE
PUMP
IF
LOCK
DETECT
CP
IF
REF
IN
OSCILLATOR
14-BIT IF
R-COUNTER
OUTPUT
MUX
22-BIT
DATA
REGISTER
SDOUT
MUXOUT
CLOCK
DATA
LE
14-BIT IF
R-COUNTER
N = BP + A
11-BIT RF
B-COUNTER
RF
IN
A
RF
IN
B
RF
PRESCALER
6-BIT RF
A-COUNTER
RF
LOCK
DETECT
CHARGE
PUMP
PHASE
COMPARATOR
CP
RF
DGND
RF
AGND
RF
DGND
IF
DGND
IF
AGND
IF
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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

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