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參數(shù)資料
| 型號： | LMX2487E |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| 中文描述： | 7.5 GHz的高性能Δ-Σ低功耗雙PLLatinum⑩頻率合成器與整數(shù)的3.0 GHz鎖相環(huán) |
| 文件頁數(shù)： | 1/38頁 |
| 文件大?。?/td> | 419K |
| 代理商： | LMX2487E |
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May 2007
LMX2487E
7.5 GHz High Performance Delta-Sigma Low Power Dual
PLLatinum
Frequency Synthesizers with 3.0 GHz Integer
PLL
General Description
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
■
WLAN Standards
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 I
CC
= 8.5 mA at 3.0 V
Functional Block Diagram
30013901
PLLatinum
is a trademark of National Semiconductor Corporation.
2007 National Semiconductor Corporation
300139
www.national.com
L
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| LMX2487ESQ | 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX2487ESQX | 7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2487E-EVM | 功能描述:EVAL MODULE FOR LMX2487 制造商:texas instruments 系列:PLLatinum?? 零件狀態(tài):在售 類型:頻率合成器 頻率:3GHz ~ 7.5GHz 配套使用產(chǎn)品/相關(guān)產(chǎn)品:LMX2487E 所含物品:板 標(biāo)準(zhǔn)包裝:1 |
| LMX2487ESQ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX2487ESQ/NOPB | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| LMX2487ESQE | 制造商:Texas Instruments 功能描述:PLL, 7.5GHZ, DUAL, DELTA SIGMA, SMD 制造商:Texas Instruments 功能描述:Delta-Sigma LPower Dual PLL,LMX2487ESQE |
| LMX2487ESQE/NOPB | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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