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LMX2487E の電気的特性と機能

LMX2487EのメーカーはNational Semiconductorです、この部品の機能は「High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizers」です。


製品の詳細 ( Datasheet PDF )

部品番号 LMX2487E
部品説明 High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizers
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 




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LMX2487E Datasheet, LMX2487E PDF,ピン配置, 機能
May 2007
LMX2487E
7.5 GHz High Performance Delta-Sigma Low Power Dual
PLLatinumFrequency Synthesizers with 3.0 GHz Integer
PLL
General Description
WLAN Standards
The LMX2487E is a low power, high performance delta-sigma
fractional-N PLL with an auxiliary integer-N PLL. It is fabricat-
ed using National Semiconductor’s advanced process.
With delta-sigma architecture, fractional spurs at lower offset
frequencies are pushed to higher frequencies outside the loop
bandwidth. The ability to push close in spur and phase noise
energy to higher frequencies is a direct function of the mod-
ulator order. Unlike analog compensation, the digital feed-
back technique used in the LMX2487E is highly resistant to
changes in temperature and variations in wafer processing.
The LMX2487E delta-sigma modulator is programmable up
to fourth order, which allows the designer to select the opti-
mum modulator order to fit the phase noise, spur, and lock
time requirements of the system.
Serial data for programming the LMX2487E is transferred via
a three line high speed (20 MHz) MICROWIRE interface. The
LMX2487E offers fine frequency resolution, low spurs, fast
programming speed, and a single word write to change the
frequency. This makes it ideal for direct digital modulation
applications, where the N counter is directly modulated with
information. The LMX2487E is available in a 24 lead
4.0 X 4.0 X 0.8 mm LLP package.
Applications
Cellular phones and base stations
Direct digital modulation applications
Satellite and cable TV tuners
Features
Quadruple Modulus Prescalers for Lower Divide Ratios
RF PLL: 16/17/20/21 or 32/33/36/37
IF PLL: 8/9 or 16/17
Advanced Delta Sigma Fractional Compensation
12 bit or 22 bit selectable fractional modulus
Up to 4th order programmable delta-sigma modulator
Features for Improved Lock Times and Programming
Fastlock / Cycle slip reduction
Integrated time-out counter
Single word write to change frequencies with Fastlock
Wide Operating Range
LMX2487E RF PLL: 3.0 GHz to 7.5 GHz
Useful Features
Digital lock detect output
Hardware and software power-down control
On-chip crystal reference frequency doubler.
RF phase comparison frequency up to 50 MHz
2.5 to 3.6 volt operation with ICC = 8.5 mA at 3.0 V
Functional Block Diagram
PLLatinumis a trademark of National Semiconductor Corporation.
© 2007 National Semiconductor Corporation 300139
30013901
www.national.com

1 Page





LMX2487E pdf, ピン配列
Absolute Maximum Ratings (Notes 1, 2)
Parameter
Power Supply Voltage
Voltage on any pin with GND = 0V
Storage Temperature Range
Lead Temperature (Solder 4 sec.)
Symbol
VCC
Vi
Ts
TL
Min
-0.3
-0.3
-65
Value
Typ
Max
4.25
VCC+0.3
+150
+260
Units
V
V
°C
°C
Recommended Operating Conditions
Parameter
Power Supply Voltage (Note 1)
Operating Temperature
Symbol
VCC
TA
Value
Min Typ
2.5 3.0
-40 25
Max
3.6
+85
Units
V
°C
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. "Recommended Operating Conditions" indicate conditions
for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the
Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. The voltage at all the power supply pins of VddRF1, VddRF2,
VddRF3, VddRF4, VddRF5, VddIF1 and VddIF2 must be the same. VCC will be used to refer to the voltage at these pins and ICC will be used to refer to the sum
of all currents through all these power pins.
Note 2: This Device is a high performance RF integrated circuit with an ESD rating < 2 kV and is ESD sensitive. Handling and assembly of this device should
only be done at ESD-free workstations.
Electrical Characteristics (VCC = 3.0V; -40°C TA +85°C unless otherwise specified)
Symbol
Parameter
Conditions
Value
Min Typ
Icc PARAMETERS
ICCRF
Power Supply Current,
RF Synthesizer
IF PLL OFF
RF PLL ON
Charge Pump TRI-STATE
5.7
ICCIF
Power Supply Current, IF
Synthesizer
IF PLL ON
RF PLL OFF
Charge Pump TRI-STATE
2.5
ICCTOTAL
Power Supply Current,
Entire Synthesizer
IF PLL ON
RF PLL ON
Charge Pump TRI-STATE
8.5
ICCPD
Power Down Current
CE = ENOSC = 0V
CLK, DATA, LE = 0V
<1
RF SYNTHESIZER PARAMETERS
fFinRF
Operating LMX2487 RF_P = 16
Frequency E
RF_P = 32
3000
3000
pFinRF
Input Sensitivity
3-6 GHz
6-7.5 GHz
-10
-5
fCOMP
Phase Detector
Frequency
(Note 3)
ICPoutRFSRCE
RF_CPG = 0
VCPoutRF = VCC/2
RF Charge Pump Source RF_CPG = 1
Current
VCPoutRF = VCC/2
(Note 4)
...
95
190
...
RF_CPG = 15
VCPoutRF = VCC/2
1520
Max
4000
7500
0
5
50
Units
mA
mA
mA
µA
MHz
dBm
MHz
µA
µA
µA
µA
3 www.national.com


3Pages


LMX2487E 電子部品, 半導体
Typical Performance Characteristics : Sensitivity (Note 7)
RF PLL Fin Sensitivity
TA = 25°C, RF_P = 32
RF PLL Fin Sensitivity
VCC = 3.0 V, RF_P = 32
30013945
www.national.com
6
30013946

6 Page



ページ 合計 : 38 ページ
 
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共有リンク

Link :


部品番号部品説明メーカ
LMX2487

Frequency Synthesizers With 3-GHz Integer PLL (Rev. C)

Texas Instruments
Texas Instruments
LMX2487

High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizers

National Semiconductor
National Semiconductor
LMX2487E

LMX2487E 7.5-GHz High-Performance Delta-Sigma Low-Power Dual PLLatinum Frequency Synthesizers With 3-GHz Integer PLL (Rev. B)

Texas Instruments
Texas Instruments
LMX2487E

High Performance Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizers

National Semiconductor
National Semiconductor


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