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LMX2470 PDF预览

LMX2470

更新时间: 2024-01-01 22:37:57
品牌 Logo 应用领域
美国国家半导体 - NSC /
页数 文件大小 规格书
36页 449K
描述
2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz Integer-N PLL

LMX2470 技术参数

是否无铅:不含铅是否Rohs认证:符合
生命周期:Active零件包装代码:QFN
包装说明:VQCCN, LCC24,.17X.14,20针数:24
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01Factory Lead Time:1 week
风险等级:1.28Is Samacsys:N
模拟集成电路 - 其他类型:PLL FREQUENCY SYNTHESIZERJESD-30 代码:S-PQCC-N24
长度:4.5 mm湿度敏感等级:1
功能数量:1端子数量:24
最高工作温度:85 °C最低工作温度:-40 °C
最大输出频率:2600 GHz封装主体材料:PLASTIC/EPOXY
封装代码:VQCCN封装等效代码:LCC24,.17X.14,20
封装形状:SQUARE封装形式:CHIP CARRIER, VERY THIN PROFILE
峰值回流温度(摄氏度):260电源:2.5 V
认证状态:Not Qualified座面最大高度:0.6 mm
子类别:PLL or Frequency Synthesis Circuits最大供电电流 (Isup):6 mA
最大供电电压 (Vsup):2.75 V最小供电电压 (Vsup):2.25 V
标称供电电压 (Vsup):2.5 V表面贴装:YES
技术:BICMOS温度等级:INDUSTRIAL
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 SPECIFIED
宽度:3.5 mmBase Number Matches:1

LMX2470 数据手册

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April 2003  
LMX2470  
2.6 GHz Delta-Sigma Fractional-N PLL with 800 MHz  
Integer-N PLL  
General Description  
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  
The LMX2470 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 LMX2470 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 LMX2470 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.  
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 30 MHz  
n Hardware and software power-down control  
n Ultra low consumption: ICC = 4.1 mA (typical)  
Applications  
Programming is fast and simple. Serial data is transferred  
into the LMX2470 via a three line MICROWIRE interface  
(Data, Clock, Load Enable). Nominal supply voltage is 2.5 V.  
The LMX2470 features a typical current consumption of 4.1  
mA at 2.5 V. The LMX2470 is available in a 24 lead 3.5 X 4.5  
X 0.6 mm package.  
n Cellular Phones and Base Stations  
CDMA, WCDMA, GSM/GPRS, TDMA, EDGE, PDC  
n Applications requiring fine frequency resolution  
n Satellite and Cable TV Tuners  
n WLAN Standards  
Functional Block Diagram  
20059301  
© 2003 National Semiconductor Corporation  
DS200593  
www.national.com  

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