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LMX2542LQ2121 PDF预览

LMX2542LQ2121

更新时间: 2024-01-03 05:35:52
品牌 Logo 应用领域
美国国家半导体 - NSC 半导体全球定位系统
页数 文件大小 规格书
22页 251K
描述
PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO

LMX2542LQ2121 技术参数

是否Rohs认证: 符合生命周期:Obsolete
包装说明:QCCN, LCC28,.2SQ,20Reach Compliance Code:compliant
风险等级:5.82JESD-30 代码:S-PQCC-N28
JESD-609代码:e3湿度敏感等级:2
端子数量:28最高工作温度:85 °C
最低工作温度:-30 °C封装主体材料:PLASTIC/EPOXY
封装代码:QCCN封装等效代码:LCC28,.2SQ,20
封装形状:SQUARE封装形式:CHIP CARRIER
电源:2.8 V认证状态:Not Qualified
子类别:PLL or Frequency Synthesis Circuits最大供电电流 (Isup):24 mA
标称供电电压 (Vsup):2.8 V表面贴装:YES
温度等级:OTHER端子面层:Matte Tin (Sn)
端子形式:NO LEAD端子节距:0.5 mm
端子位置:QUADBase Number Matches:1

LMX2542LQ2121 数据手册

 浏览型号LMX2542LQ2121的Datasheet PDF文件第2页浏览型号LMX2542LQ2121的Datasheet PDF文件第3页浏览型号LMX2542LQ2121的Datasheet PDF文件第4页浏览型号LMX2542LQ2121的Datasheet PDF文件第5页浏览型号LMX2542LQ2121的Datasheet PDF文件第6页浏览型号LMX2542LQ2121的Datasheet PDF文件第7页 
May 2004  
LMX2542  
PLLatinumTM Cellular and GPS Frequency Synthesizer  
System with Integrated VCO  
General Description  
Features  
n Small Size  
LMX2542 is a highly integrated, high performance, low  
power frequency synthesizer system optimized for Cellular-  
CDMA 1xRTT and IS-95 mobile handsets and data systems  
with GPS capabilities. Using a proprietary digital phase  
locked loop technique, LMX2542 provides very stable, low  
noise local oscillator (LO) signals for up and down conver-  
sion in wireless communications devices.  
5.0 mm x 5.0 mm x 0.75 mm 28-Pin LLP  
n RF Synthesizer System  
Integrated RF VCO  
Integrated Loop Filter  
Low Spurious, Low Phase Noise Fractional-N RF  
PLL Based on 11-Bit ∆Σ modulator  
5 kHz Frequency Resolution  
Cellular-CDMA LO: 2105.28 MHz to 2155.14 MHz  
(Requires an External LO /2 Circuit)  
GPS LO: 2087.73 MHz  
LMX2542 includes a Voltage Controlled Oscillator (VCO) for  
both the Cellular-CDMA and GPS frequency bands, a loop  
filter, and a Fractional-N RF PLL based on a Delta Sigma  
(∆Σ) modulator. In concert, these blocks form a closed loop  
RF synthesizer system. The RF synthesizer system oper-  
ates from 2087.73 MHz to 2155.14 MHz.  
(Requires an External LO /1.5 Circuit)  
n IF Synthesizer System  
Integer-N IF PLL  
Programmable Charge Pump Current Levels  
IF LO: 367.20 MHz  
LMX2542 includes an Integer-N IF PLL also. For more flex-  
ible loop filter designs, the IF PLL includes a 4-level pro-  
grammable charge pump. Together with an external VCO  
and loop filter, LMX2542 makes a complete closed loop IF  
synthesizer system. The default IF frequency is 367.20 MHz.  
n Supports Various Reference Oscillator Frequencies:  
19.20 MHz/ 19.68 MHz  
n
Low Current Consumption:  
22 mA typical at 2.8V  
Serial data is transferred to the device via a three-wire  
MICROWIRETM interface (DATA, LE, CLK).  
n 2.7V to 3.3V Operation  
n RF Digital Filtered Lock Detect Output  
n Hardware and Software Powerdown Control  
Operating supply voltage ranges from 2.7V to 3.3V.  
LMX2542 features low current consumption: 22 mA at 2.8V.  
LMX2542 is available in a 28-Pin Leadless Leadframe Pack-  
age (LLP).  
Applications  
n Cellular-CDMA 1xRTT and IS-95 Mobile Handsets with  
GPS  
n Cellular-CDMA 1xRTT and IS-95 Mobile Data Systems  
with GPS  
Leadless Leadframe Package (LQA28A)  
20082411  
PLLatinum , MICROWIRE are trademarks of National Semiconductor Corporation.  
TRI-STATE® is a registered trademark of National Semiconductor Corporation.  
© 2004 National Semiconductor Corporation  
DS200824  
www.national.com  

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