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ADF4252 Datasheet

  • ADF4252

  • Dual Fractional-N/Integer-N Frequency Synthesizer

  • 800.38KB

  • 29页

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a
FEATURES
3.0 GHz Fractional-N/1.2 GHz Integer-N
2.7 V to 3.3 V Power Supply
Separate V
P
Allows Extended Tuning Voltage to 5 V
Programmable Dual Modulus Prescaler
RF: 4/5, 8/9
IF: 8/9, 16/17, 32/33, 64/65
Programmable Charge Pump Currents
3-Wire Serial Interface
Digital Lock Detect
Power-Down Mode
Programmable Modulus on Fractional-N Synthesizer
Trade-Off Noise versus Spurious Performance
APPLICATIONS
Base Stations for Mobile Radio (GSM, PCS, DCS,
CDMA, WCDMA)
Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA)
Wireless LANs
Communications Test Equipment
CATV Equipment
Dual Fractional-N/Integer-N
Frequency Synthesizer
ADF4252
GENERAL DESCRIPTION
The ADF4252 is a dual fractional-N/integer-N frequency
synthesizer that can be used to implement local oscillators
(LO) in the upconversion and downconversion sections of
wireless receivers and transmitters. Both the RF and IF syn-
thesizers consist of a low noise digital PFD (phase frequency
detector), a precision charge pump, and a programmable refer-
ence divider. The RF synthesizer has a - -based fractional
interpolator that allows programmable fractional-N division.
The IF synthesizer has programmable integer-N counters. A
complete PLL (phase-locked loop) can be implemented if the
synthesizer is used with an external loop filter and VCO (volt-
age controlled oscillator).
Control of all the on-chip registers is via a simple 3-wire inter-
face. The devices operate with a power supply ranging from
2.7 V to 3.3 V and can be powered down when not in use.
FUNCTIONAL BLOCK DIAGRAM
V
DD
1
V
DD
2
V
DD
3
DV
DD
V
P
1
V
P
2
R
SET
ADF4252
REFERENCE
4-BIT R
COUNTER
REF
IN
2
DOUBLER
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
CP
RF
REF
OUT
LOCK
DETECT
RF
IN
A
RF
IN
B
MUXOUT
OUTPUT
MUX
FRACTIONAL N
RF DIVIDER
CLK
DATA
LE
24-BIT
DATA
REGISTER
INTEGER N
IF DIVIDER
IF
IN
B
IF
IN
A
2
DOUBLER
15-BIT R
COUNTER
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
CP
IF
REV. B
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. 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.
A
GND
1
A
GND
2
D
GND
CP
GND
1
CP
GND
2
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
漏 2003 Analog Devices, Inc. All rights reserved.

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