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ADF4007 Scheda tecnica(PDF) 1 Page - Analog Devices

Il numero della parte ADF4007
Spiegazioni elettronici  High Frequency Divider/PLL Synthesizer
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Homepage  http://www.analog.com
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High Frequency Divider/PLL Synthesizer
ADF4007
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 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
FEATURES
7.5 GHz bandwidth
Maximum PFD frequency of 120 MHz
Divide ratios of 8, 16, 32, or 64
2.7 V to 3.3 V power supply
Separate charge pump supply (VP) allows
extended tuning voltage in 3 V systems
RSET contol of charge pump current
Hardware power-down mode
APPLICATIONS
Satellite communications
Broadband wireless access
CATV
Instrumentation
Wireless LANs
GENERAL DESCRIPTION
The ADF4007 is a high frequency divider/PLL synthesizer that
can be used in a variety of communications applications. It can
operate to 7.5 GHz on the RF side and to 120 MHz at the PFD.
It consists of a low noise digital PFD (phase frequency
detector), a precision charge pump, and a divider/prescaler. The
divider/ prescaler value can be set by two external control pins
to one of four values (8, 16, 32, or 64). The reference divider is
permanently set to 2, allowing an external REFIN frequency of
up to 240 MHz.
A complete PLL (phase-locked loop) can be implemented if the
synthesizer is used with an external loop filter and a VCO
(voltage controlled oscillator). Its very high bandwidth means
that frequency doublers can be eliminated in many high
frequency systems, simplifying system architecture and
reducing cost.
FUNCTIONAL BLOCK DIAGRAM
REFIN
RFINA
RFINB
VDD
N2
N1
GND
R COUNTER
÷ 2
MUX
MUXOUT
CPGND
RSET
VP
CP
PHASE
FREQUENCY
DETECTOR
REFERENCE
CHARGE
PUMP
ADF4007
N COUNTER
÷ 8, ÷ 16,
÷ 32, ÷ 64
M2
M1
Figure 1.


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