Datasheet > LMX2502

LMX2502

更新时间： 2024-02-21 20:12:19

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
18页	182K
描述
PLLatinum⑩ Frequency Synthesizer System with Integrated VCO

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中文翻译

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数据手册

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LMX2502 数据手册

June 2003

LMX2502/LMX2512

™

PLLatinum Frequency Synthesizer System with

Integrated VCO

General Description

Features

n Small Size

LMX2502 and LMX2512 are highly integrated, high perfor-

mance, low power frequency synthesizer systems optimized

for Korean PCS and Korean Cellular CDMA (1xRTT, IS-95)

mobile handsets. Using a proprietary digital phase locked

loop technique, LMX2502 and LMX2512 generate very

stable, low noise local oscillator signals for up and down

conversion in wireless communications devices.

5.0 mm X 5.0 mm X 0.75 mm 28-Pin LLP Package

n RF Synthesizer System

Integrated RF VCO

Integrated Loop Filter

Low Spurious, Low Phase Noise Fractional-N RF PLL

Based on 11-Bit Delta Sigma Modulator

10 kHz Frequency Resolution

n IF Synthesizer System

Integer-N IF PLL

Programmable Charge Pump Current Levels

Programmable Frequency

n Supports Various Reference Frequencies

19.20/19.68 MHz

n Fast Lock Time: 500 µs

n Low Current Consumption

17 mA at 2.8 V

n 2.7 V to 3.3 V Operation

LMX2502 and LMX2512 include a voltage controlled oscil-

lator (VCO), a loop filter, and a fractional-N RF PLL based on

a delta sigma modulator. In concert these blocks form a

closed loop RF synthesizer system. LMX2502 supports the

Korean PCS band and LMX2512 supports the Korean Cel-

lular band.

LMX2502 and LMX2512 include 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 exter-

nal VCO and loop filter, LMX2502 and LMX2512 make a

complete closed loop IF synthesizer system.

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

MICROWIRE interface (DATA, LE, CLK).

n Digital Filtered Lock Detect Output

n Hardware and Software Power Down Control

Operating supply voltage ranges from 2.7 V to 3.3 V.

LMX2502 and LMX2512 feature low current consumption:

17 mA at 2.8 V.

Applications

n Korean PCS CDMA Systems

n Korean Cellular CDMA Systems

LMX2502 and LMX2512 are available in a 28-pin leadless

leadframe package (LLP).

Functional Block Diagram

20068001

™

PLLatinum is a trademark of National Semiconductor Corporation.

DS200680

www.national.com

12 3 4 5 6 7...18

中文翻译

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与LMX2502相关器件

型号	品牌	获取价格	描述	数据表
LMX2502LQ1635	NSC	获取价格	PLLatinum⑩ Frequency Synthesizer System with
LMX2502LQ1635/NOPB	TI	获取价格	具有集成 VCO 的频率合成器系统 \| NJB \| 28 \| -30 to 85
LMX2502LQX1635	NSC	获取价格	PLLatinum⑩ Frequency Synthesizer System with
LMX2502LQX1635	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 19.68MHz, QCC28, 5 X 5 MM, 0.75 MM HEIGHT, LLP-28
LMX2505	NSC	获取价格	PLLatinu Dual Frequency Synthesizer System with Integrated VCOs
LMX2505LQ1321	NSC	获取价格	PLLatinu Dual Frequency Synthesizer System with Integrated VCOs
LMX2505LQX1321	NSC	获取价格	PLLatinu Dual Frequency Synthesizer System with Integrated VCOs
LMX2512	NSC	获取价格	PLLatinum⑩ Frequency Synthesizer System with
LMX2512LQ0967	NSC	获取价格	PLLatinum⑩ Frequency Synthesizer System with
LMX2512LQ1065	NSC	获取价格	PLLatinum⑩ Frequency Synthesizer System with

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