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| 型號： | EVAL-ADF4252EBZ2 |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/28頁 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL ADF4252 NO VCO/FILTER |
| 標準包裝： | 1 |
| 主要目的： | 計時，頻率合成器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADF4252 |
| 主要屬性： | 雙路分數-N PLL II |
| 次要屬性： | 板不包括環路濾波器和 VCO |
| 已供物品： | 部分安裝的板，線纜，軟件 |
| 相關產品： | ADF4252BCPZ-R7-ND - IC PLL FREQ SYNTHESIZER 24LFCSP ADF4252BCPZ-RL-ND - IC PLL FREQ SYNTHESIZER 24LFCSP ADF4252BCPZ-ND - IC PLL FREQ SYNTHESIZER 24-LFCSP |
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REV. B
a
ADF4252
Dual Fractional-N/Integer-N
Frequency Synthesizer
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
2003 Analog Devices, Inc. All rights reserved.
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.
FEATURES
3.0 GHz Fractional-N/1.2 GHz Integer-N
2.7 V to 3.3 V Power Supply
Separate VP 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
FUNCTIONAL BLOCK DIAGRAM
ADF4252
2
DOUBLER
OUTPUT
MUX
4-BIT R
COUNTER
PHASE
FREQUENCY
DETECTOR
LOCK
DETECT
CHARGE
PUMP
REFERENCE
REFIN
REFOUT
VDD1
VDD2
VDD3
DVDD
VP1
VP2
RSET
24-BIT
DATA
REGISTER
CLK
DATA
LE
RFINA
RFINB
CPRF
CPIF
2
DOUBLER
15-BIT R
COUNTER
CHARGE
PUMP
PHASE
FREQUENCY
DETECTOR
MUXOUT
AGND1 AGND2
DGND
CPGND1
CPGND2
IFINB
IFINA
FRACTIONAL N
RF DIVIDER
INTEGER N
IF DIVIDER
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.
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