Datasheet > LMX2542

LMX2542

更新时间： 2024-09-29 22:46:59

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

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LMX2542 数据手册

May 2004

LMX2542

PLLatinum^TMCellular 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

Low Current Consumption:

22 mA typical at 2.8V

Serial data is transferred to the device via a three-wire

MICROWIRE^TMinterface (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.

DS200824

www.national.com

12 3 4 5 6 7...22

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与LMX2542相关器件

型号	品牌	获取价格	描述	数据表
LMX2542LQ2121	NSC	获取价格	PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO
LMX2542LQ2121/NOPB	TI	获取价格	IC,FREQUENCY SYNTHESIZER,LLCC,28PIN,PLASTIC
LMX2542LQX2121	NSC	获取价格	PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO
LMX2542LQX2121/NOPB	TI	获取价格	IC,FREQUENCY SYNTHESIZER,LLCC,28PIN,PLASTIC
LMX2571	TI	获取价格	具有移频键控 (FSK) 调制功能的 1.34GHz、低功耗、极端温度 RF 合成器
LMX2571-EP	TI	获取价格	具有 FSK 调制功能的增强型 1.34GHz、低功耗、极端温度 RF 合成器
LMX2571NJKR	TI	获取价格	具有移频键控 (FSK) 调制功能的 1.34GHz、低功耗、极端温度 RF 合成器 \|
LMX2571NJKT	TI	获取价格	具有移频键控 (FSK) 调制功能的 1.34GHz、低功耗、极端温度 RF 合成器 \|
LMX2571SRHHTEP	TI	获取价格	具有 FSK 调制功能的增强型 1.34GHz、低功耗、极端温度 RF 合成器 \| RHH
LMX2572	TI	获取价格	6.4GHz 低功耗宽带射频合成器

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