參數(shù)資料
型號： LMX2487SQX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
中文描述： PLL FREQUENCY SYNTHESIZER, 6000 MHz, PQCC24
封裝： 4 X 4 MM, 0.80 MM HEIGHT, PLASTIC, LLP-24
文件頁數(shù)： 1/37頁
文件大?。?/td> 856K
代理商： LMX2487SQX
LMX2487
3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low
Power Dual PLLatinum
Frequency Synthesizers with
3.0 GHz Integer PLL
General Description
The LMX2487 is a low power, high performance delta-sigma
fractional-N PLL with an auxiliary integer-N PLL. It is fabri-
cated 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
modulator order. Unlike analog compensation, the digital
feedback technique used in the LMX2487 is highly resistant
to changes in temperature and variations in wafer process-
ing. The LMX2487 delta-sigma modulator is programmable
up to fourth order, which allows the designer to select the
optimum modulator order to fit the phase noise, spur, and
lock time requirements of the system.
Serial data for programming the LMX2487 is transferred via
a three line high speed (20 MHz) MICROWIRE interface.
The LMX2487 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 modula-
tion applications, where the N counter is directly modulated
with information. The LMX2487 is available in a 24 lead
4.0 X 4.0 X 0.8 mm LLP package.
Applications
n
Cellular phones and base stations
n
Direct digital modulation applications
n
Satellite and cable TV tuners
n
WLAN Standards
Features
Quadruple Modulus Prescalers for Lower Divide Ratios
n
RF PLL:
16/17/20/21 or 32/33/36/37
n
IF PLL:
8/9 or 16/17
Advanced Delta Sigma Fractional Compensation
n
12 bit or 22 bit selectable fractional modulus
n
Up to 4th order programmable delta-sigma modulator
Features for Improved Lock Times and Programming
n
Fastlock / Cycle slip reduction
n
Integrated time-out counter
n
Single word write to change frequencies with Fastlock
Wide Operating Range
n
LMX2487 RF PLL: 3.0 GHz to 6.0 GHz
Useful Features
n
Digital lock detect output
n
Hardware and software power-down control
n
On-chip crystal reference frequency doubler.
n
RF phase comparison frequency up to 50 MHz
n
2.5 to 3.6 volt operation with I
CC
= 8.5 mA at 3.0 V
Functional Block Diagram
20154701
PLLatinum
is a trademark of National Semiconductor Corporation.
February 2006
L
2006 National Semiconductor Corporation
DS201547
www.national.com
相關(guān)PDF資料
PDF描述
LMX3161 Single Chip Radio Transceiver(單芯片無線電收發(fā)器)
LMX3161VBH Single Chip Radio Transceiver
LMX3161VBHX Single Chip Radio Transceiver
LMX3162 Single Chip Radio Transceiver(單芯片無線電收發(fā)器)
LMX3162VBH Single Chip Radio Transceiver
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2487SQX/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
LMX2491RTWR 功能描述:HIGH FREQUENCY PLL 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:頻率合成器（RF） PLL:是 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:無/無 頻率 - 最大值:6.4GHz 分頻器/倍頻器:是/是 電壓 - 電源:3.15 V ~ 3.45 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-WFQFN 裸露焊盤 供應(yīng)商器件封裝:24-WQFN（4x4） 標(biāo)準(zhǔn)包裝:1
LMX2491RTWT 功能描述:6.4GHZ LOW NOISE FRACTIONAL N PL 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:頻率合成器（RF） PLL:是 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:無/無 頻率 - 最大值:6.4GHz 分頻器/倍頻器:是/是 電壓 - 電源:3.15 V ~ 3.45 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-WFQFN 裸露焊盤 供應(yīng)商器件封裝:24-WQFN（4x4） 標(biāo)準(zhǔn)包裝:1
LMX2492EVM 功能描述:LMX2492 - Timing, PLL Evaluation Board 制造商:texas instruments 系列:- 零件狀態(tài):有效 主要用途:計時，PLL 嵌入式:- 使用的 IC/零件:LMX2492 主要屬性:帶 VCO 的單路分?jǐn)?shù)-N PLL 輔助屬性:LED 狀態(tài)指示器 所含物品:板 標(biāo)準(zhǔn)包裝:1
LMX2492QRTWTQ1 功能描述:IC HIGH FREQ PLL 24VQFN 制造商:texas instruments 系列:汽車級，AEC-Q100 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:頻率合成器（RF） PLL:是 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:無/無 頻率 - 最大值:14GHz 分頻器/倍頻器:是/是 電壓 - 電源:3.15 V ~ 3.45 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-WFQFN 裸露焊盤 供應(yīng)商器件封裝:24-WQFN（4x4） 標(biāo)準(zhǔn)包裝:1
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*