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LMX2542LQ2121/NOPB PDF预览

LMX2542LQ2121/NOPB

更新时间： 2024-11-25 19:43:35
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
25页 377K
描述
IC,FREQUENCY SYNTHESIZER,LLCC,28PIN,PLASTIC

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LMX2542LQ2121/NOPB 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/NOPB 数据手册

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OBSOLETE  
LMX2542  
www.ti.com  
SNWS015B –MARCH 2004–REVISED APRIL 2013  
TM  
LMX2542 PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated  
VCO  
Check for Samples: LMX2542  
1
FEATURES  
DESCRIPTION  
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 conversion in  
wireless communications devices.  
2
•
Small Size  
–
5.0 mm x 5.0 mm x 0.75 mm 28-Pin WQFN  
•
RF Synthesizer System  
–
–
–
Integrated RF VCO  
Integrated Loop Filter  
Low Spurious, Low Phase Noise Fractional-  
N RF PLL Based on 11-Bit ΔΣ Modulator  
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 (ΔΣ) modulator. In  
–
–
5 kHz Frequency Resolution  
Cellular-CDMA LO: 2105.28 MHz to 2155.14  
MHz (Requires an External LO /2 Circuit)  
concert, these blocks form  
a closed loop RF  
–
–
GPS LO: 2087.73 MHz  
synthesizer system. The RF synthesizer system  
operates from 2087.73 MHz to 2155.14 MHz.  
(Requires an External LO /1.5 Circuit)  
•
IF Synthesizer System  
LMX2542 includes an Integer-N IF PLL also. For  
more flexible loop filter designs, the IF PLL includes a  
4-level programmable 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.  
–
–
Integer-N IF PLL  
Programmable Charge Pump Current  
Levels  
–
IF LO: 367.20 MHz  
•
•
Supports Various Reference Oscillator  
Frequencies:  
Serial data is transferred to the device via a three-  
wire MICROWIRETM interface (DATA, LE, CLK).  
–
19.20 MHz/ 19.68 MHz  
Low Current Consumption:  
22 mA Typical at 2.8V  
Operating supply voltage ranges from 2.7V to 3.3V.  
LMX2542 features low current consumption: 22 mA at  
2.8V.  
–
•
•
•
2.7V to 3.3V Operation  
LMX2542 is available in  
Leadframe Package (WQFN).  
a
28-Pin Leadless  
RF Digital Filtered Lock Detect Output  
Hardware and Software Powerdown Control  
APPLICATIONS  
•
Cellular-CDMA 1xRTT and IS-95 Mobile  
Handsets with GPS  
•
Cellular-CDMA 1xRTT and IS-95 Mobile Data  
Systems with GPS  
Leadless Leadframe Package  
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
All 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 © 2004–2013, Texas Instruments Incorporated  
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