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參數(shù)資料
| 型號： | LMX2471 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL |
| 中文描述： | 3.6 GHz的Δ-Σ分數(shù)N與1.7 GHz的整數(shù)N分頻PLL鎖相環(huán) |
| 文件頁數(shù)： | 1/36頁 |
| 文件大?。?/td> | 458K |
| 代理商： | LMX2471 |
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LMX2471
3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz
Integer-N PLL
General Description
The LMX2471 is a low power, high performance delta-sigma
fractional-N PLL with an auxiliary integer-N PLL. The device
is fabricated using National Semiconductor’s advanced BiC-
MOS process.
With delta-sigma architecture, fractional spur compensation
is achieved with noise shaping capability of the delta-sigma
modulator and the inherent low pass filtering of the PLL loop
filter. Fractional spurs at lower frequencies are pushed to
higher frequencies outside the loop bandwidth. Unlike ana-
log compensation, the digital feedback techniques used in
the LMX2471 are highly resistant to changes in temperature
and variations in wafer processing. With delta-sigma archi-
tecture, the ability to push close in spur and phase noise
energy to higher frequencies is a direct function of the modu-
lator order. The higher the order, the more this energy can be
spread to higher frequencies. The LMX2471 has a program-
mable modulator up to order four, which allows the designer
to select the optimum modulator order to fit the phase noise,
spur, and lock time requirements of the system.
Programming is fast and simple. Serial data is transferred
into the LMX2471 via a three line MICROWIRE interface
(Data, Clock, Load Enable). Nominal supply voltage is 2.5 V.
The LMX2471 features a typical current consumption of 5.6
mA at 2.5 V. The LMX2471 is available in a 24 lead 3.5 X 4.5
X 0.6 mm package.
Features
n
Low in-band phase noise and low fractional spurs
n
12 bit or 22 bit selectable fractional modulus
n
Up to 4th order programmable delta-sigma modulator
n
Enhanced Anti-Cycle Slip Fastlock Circuitry
Fastlock
Cycle slip reduction
Integrated timeout counters
n
Digital lock detect output
n
Prescalers allow wide range of N values
RF PLL: 16/17/20/21
IF PLL: 8/9 or 16/17
n
Crystal Reference Frequency up to 110 MHz
n
On-chip crystal reference frequency doubler.
n
Phase Comparison Frequency up to 50 MHz
n
Hardware and software power-down control
n
Ultra low consumption: I
CC
= 5.6 mA (typical)
Applications
n
Cellular Phones and Base Stations
n
Applications requiring fine frequency resolution
n
Satellite and Cable TV Tuners
n
WLAN Standards
Functional Block Diagram
20072101
November 2003
L
2003 National Semiconductor Corporation
DS200721
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2471 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2471SLEX | 功能描述:IC PLL LP 3.6GHZ/1.7GHZ 24-CSP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設(shè)備封裝:* 包裝:* |
| LMX2471SLEX/NOPB | 制造商:Texas Instruments 功能描述:PLL Dual 250MHz to 3600MHz 24-Pin LAM CSP T/R |
| LMX2485 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800MHz Integer PLL |
| LMX2485_0610 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL |
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