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LMX2487

更新时间： 2024-02-16 05:37:46
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
47页 1189K
描述
Low-Power Dual PLLatinum Frequency Synthesizers

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LMX2487 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Obsolete包装说明：QCCN, LCC24,.16SQ,20
Reach Compliance Code：compliantECCN代码：5A991.G
HTS代码：8542.39.00.01风险等级：5.68
模拟集成电路 - 其他类型：PLL FREQUENCY SYNTHESIZERJESD-30 代码：S-PQCC-N24
JESD-609代码：e3湿度敏感等级：3
端子数量：24最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：QCCN封装等效代码：LCC24,.16SQ,20
封装形状：SQUARE封装形式：CHIP CARRIER
峰值回流温度（摄氏度）：260电源：3 V
认证状态：Not Qualified子类别：PLL or Frequency Synthesis Circuits
标称供电电压 (Vsup)：3 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIEDBase Number Matches：1

LMX2487 数据手册

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LMX2487  
www.ti.com  
SNAS322B –FEBRUARY 2006–REVISED MARCH 2013  
LMX2487 1.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum™  
Frequency Synthesizers with 3.0 GHz Integer PLL  
Check for Samples: LMX2487  
1
FEATURES  
APPLICATIONS  
23  
•
Quadruple Modulus Prescalers for Lower  
Divide Ratios  
•
•
•
•
Cellular Phones and Base Stations  
Direct Digital Modulation Applications  
Satellite and Cable TV Tuners  
WLAN Standards  
–
–
RF PLL: 16/17/20/21 or 32/33/36/37  
IF PLL: 8/9 or 16/17  
•
•
Advanced Delta Sigma Fractional  
Compensation  
DESCRIPTION  
The LMX2487 is a low power, high performance  
delta-sigma fractional-N PLL with an auxiliary integer-  
N PLL. It is fabricated using TI’s advanced process.  
–
12 Bit or 22 Bit Selectable Fractional  
Modulus  
–
Up to 4th Order Programmable Delta-Sigma  
Modulator  
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 processing. 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.  
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  
LMX2487 RF PLL: 1.0 GHz to 6.0 GHz  
Useful Features  
–
–
–
Digital Lock Detect Output  
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  
modulation 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 WQFN  
package.  
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  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
PLLatinum is a trademark of Texas Instruments.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2006–2013, Texas Instruments Incorporated  
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