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參數資料
| 型號： | ADF4251 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Fractional-N/Integer-N Frequency Synthesizer |
| 中文描述： | 雙Fractional-N/Integer-N頻率合成器 |
| 文件頁數： | 1/28頁 |
| 文件大小： | 387K |
| 代理商： | ADF4251 |
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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.
ADF4251
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.
www.analog.com
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
Software and Hardware Power-Down
APPLICATIONS
Base Stations for Mobile Radio (GSM, PCS, DCS,
CDMA, WCDMA)
Wireless Handsets (GSM, PCS, DCS, CDMA, WCDMA,
PHS)
Wireless LANs
Communications Test Equipment
CATV Equipment
FUNCTIONAL BLOCK DIAGRAM
ADF4251
2
DOUBLER
OUTPUT
MUX
4-BIT R
COUNTER
PHASE
FREQUENCY
DETECTOR
LOCK
DETECT
CHARGE
PUMP
REFERENCE
REF
IN
V
DD
1
V
DD
2
V
DD
3
DV
DD
V
P
1
V
P
2
R
SET
24-BIT
DATA
REGISTER
CLK
DATA
LE
RF
IN
A
RF
IN
B
CP
RF
CP
IF
2
DOUBLER
15-BIT R
COUNTER
CHARGE
PUMP
PHASE
FREQUENCY
DETECTOR
MUXOUT
A
GND
1
A
GND
2
D
GND
CP
GND
1 CP
GND
2
IF
IN
B
IF
IN
A
FRACTIONAL N
RF DIVIDER
INTEGER N
IF DIVIDER
CE
FROM
REFIN
GENERAL DESCRIPTION
The ADF4251 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.
相關PDF資料 |
PDF描述 |
|---|---|
| ADF4251BCP | Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4251BCP-REEL | Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4251BCP-REEL7 | Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4252BCP | Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4252BCP-REEL | Dual Fractional-N/Integer-N Frequency Synthesizer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADF4251BCP | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Dual 24-Pin LFCSP EP |
| ADF4251BCP-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4251BCP-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4252 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Fractional-N/Integer-N Frequency Synthesizer |
| ADF4252BCP | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Dual 24-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:1000-2500MHZ FRAC-N PLL - Bulk 制造商:Analog Devices 功能描述:IC SYNTHESIZER PLL |
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