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ADF4251 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADF4251은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 ADF4251 기능
기능 Dual Fractional-N/Integer-N Frequency Synthesizer
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ADF4251 데이터시트, 핀배열, 회로
www.DataSheet4U.com
Dual Fractional-N/Integer-N
Frequency Synthesizer
ADF4251
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
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
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.
FUNCTIONAL BLOCK DIAGRAM
ADF4251
REFIN
VDD1 VDD2 VDD3 DVDD VP1
VP2
؋2
DOUBLER
4-BIT R
COUNTER
PHASE
FREQUENCY
DETECTOR
RSET
REFERENCE
CHARGE
PUMP
CE
CPRF
MUXOUT
CLK
DATA
LE
FROM
REFIN
OUTPUT
MUX
24-BIT
DATA
REGISTER
؋2
DOUBLER
LOCK
DETECT
FRACTIONAL N
RF DIVIDER
INTEGER N
IF DIVIDER
15-BIT R
COUNTER
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
RFINA
RFINB
IFINB
IFINA
CPIF
AGND1 AGND2 DGND CPGND1 CPGND2
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. 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 © 2003 Analog Devices, Inc. All rights reserved.




ADF4251 pdf, 반도체, 판매, 대치품
ADF4251
ABSOLUTE MAXIMUM RATINGS1, 2
(TA = 25°C, unless otherwise noted.)
VDD1, VDD2, VDD3, DVDD to GND3 . . . . . . . . –0.3 V to +4 V
REFIN, RFINA, RFINB to GND . . . . . . –0.3 V to VDD + 0.3 V
VP1, VP2 to GND . . . . . . . . . . . . . . . . . . . . . –0.3 V to +5.8 V
VP1, VP2 to VDD1 . . . . . . . . . . . . . . . . . . . . . –3.3 V to +3.5 V
Digital I/O Voltage to GND . . . . . . . . –0.3 V to VDD + 0.3 V
Analog I/O Voltage to GND . . . . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range
Industrial (B Version) . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . 150°C
LFCSP JA Thermal Impedance . . . . . . . . . . . . . . . . 122°C/W
Soldering Reflow Temperature
Vapor Phase (60 sec max) . . . . . . . . . . . . . . . . . . . . . 240°C
IR Reflow (20 sec max) . . . . . . . . . . . . . . . . . . . . . . . 240°C
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only and functional operation of
the device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2This device is a high performance RF integrated circuit with an ESD rating
of <2 kW, and it is ESD sensitive. Proper precautions should be taken for handling
and assembly.
3GND = CPGND1, AGND1, DGND, AGND2, and CPGND2.
PIN CONFIGURATION
CPRF 1
CPGND1 2
RFINA 3
RFINB 4
AGND1 5
MUXOUT 6
PIN 1
INDICATOR
ADF4251
TOP VIEW
(Not to Scale)
18 CPGND2
17 DVDD
16 IFINA
15 IFINB
14 AGND2
13 RSET
ORDERING GUIDE
Model
Temperature Range
ADF4251BCP
ADF4251BCP-REEL
ADF4251BCP-REEL7
–40ºC to +85ºC
–40ºC to +85ºC
–40ºC to +85ºC
*CP = Lead Frame Chip Scale Package
Package Option*
CP-24
CP-24
CP-24
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADF4251 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
–4– REV. 0

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ADF4251 전자부품, 판매, 대치품
Typical Performance Characteristics–ADF4251
0
VDD = 3V, VP = 5V
–10 ICP = 1.875mA
PFD FREQUENCY = 10MHz
–20 CHANNEL STEP = 200kHz
LOOP BANDWIDTH = 20kHz
–30 FRACTION = 59/100
RBW = 10Hz
–40
REFERENCE
LEVEL = – 4.2dBm
–50
–60
–70
–80 – 99.19dBc/Hz
–90
–100
–2kHz
–1kHz 1.7518GHz 1kHz
FREQUENCY
2kHz
TPC 1. Phase Noise Plot, Lowest Noise Mode,
1.7518 GHz RFOUT, 10 MHz PFD Frequency,
200 kHz Channel Step Resolution
0
VDD = 3V, VP = 5V
–10 ICP = 1.875mA
PFD FREQUENCY = 10MHz
–20 CHANNEL STEP = 200kHz
LOOP BANDWIDTH = 20kHz
–30 FRACTION = 59/100
RBW = 1kHz
–40
REFERENCE
LEVEL = – 4.2dBm
–50
–50dBc@
–60 100kHz
–70
–80
–90
–100
–400kHz
–200kHz 1.7518GHz 200kHz
FREQUENCY
400kHz
TPC 4. Spurious Plot, Lowest Noise Mode,
1.7518 GHz RFOUT, 10 MHz PFD Frequency,
200 kHz Channel Step Resolution
0
VDD = 3V, VP = 5V
–10 ICP = 1.875mA
PFD FREQUENCY = 10MHz
–20 CHANNEL STEP = 200kHz
LOOP BANDWIDTH = 20kHz
–30
FRACTION = 59/100
RBW = 10Hz
–40
REFERENCE
LEVEL = – 4.2dBm
–50
–60
–70 –90.36dBc/Hz
–80
–90
–100
–2kHz
–1kHz 1.7518GHz 1kHz
FREQUENCY
2kHz
TPC 2. Phase Noise Plot, Low Noise and Spur
Mode, 1.7518 GHz RFOUT, 10 MHz PFD Frequency,
200 kHz Channel Step Resolution
0
VDD = 3V, VP = 5V
–10 ICP = 1.875mA
PFD FREQUENCY = 10MHz
–20 CHANNEL STEP = 200kHz
LOOP BANDWIDTH = 20kHz
–30
FRACTION = 59/100
RBW = 1kHz
–40
–50
–51dBc@
100kHz
–60
REFERENCE
LEVEL = – 4.2dBm
–70
–80
–90
–100
–400kHz
–200kHz 1.7518GHz 200kHz
FREQUENCY
400kHz
TPC 5. Spurious Plot, Low Noise and Spur Mode,
1.7518 GHz RFOUT, 10 MHz PFD Frequency,
200 kHz Channel Step Resolution
0
VDD = 3V, VP = 5V
–10 ICP = 1.875mA
PFD FREQUENCY = 10MHz
–20 CHANNEL STEP = 200kHz
LOOP BANDWIDTH = 20kHz
–30
FRACTION = 59/100
RBW = 10Hz
–40
REFERENCE
LEVEL = – 4.2dBm
–50
–60
–85.86dBc/Hz
–70
–80
–90
–100
–2kHz
–1kHz 1.7518GHz 1kHz
FREQUENCY
2kHz
TPC 3. Phase Noise Plot, Lowest Spur Mode,
1.7518 GHz RFOUT, 10 MHz PFD Frequency,
200 kHz Channel Step Resolution
0
VDD = 3V, VP = 5V
–10 ICP = 1.875mA
PFD FREQUENCY = 10MHz
–20 CHANNEL STEP = 200kHz
LOOP BANDWIDTH = 20kHz
–30
FRACTION = 59/100
RBW = 1kHz
–40
REFERENCE
LEVEL = – 4.2dBm
–50
–72dBc@
–60 100kHz
–70
–80
–90
–100
–400kHz
–200kHz 1.7518GHz 200kHz
FREQUENCY
400kHz
TPC 6. Spurious Plot, Lowest Spur Mode,
1.7518 GHz RFOUT, 10 MHz PFD Frequency,
200 kHz Channel Step Resolution
TPCs 112 attained using EVAL-ADF4252EB1 Evaluation Board; measurements from HP8562E spectrum analyzer.
REV. 0
–7–

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