Datasheet > 信号电路 > 锁相环或频率合成电路> LMX3305SLBX

LMX3305SLBX

更新时间： 2024-02-20 12:41:09

品牌	Logo	应用领域
美国国家半导体 - NSC		信号电路锁相环或频率合成电路射频个人通信
页数	文件大小	规格书
24页	216K
描述
Triple Phase Locked Loop for RF Personal Communications

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技术参数
数据手册

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LMX3305SLBX 技术参数

生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	,	针数：	24
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.8	模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER
Base Number Matches：	1

LMX3305SLBX 数据手册

PRELIMINARY

August 2000

LMX3305

Triple Phase Locked Loop for RF Personal

Communications

General Description

Features

n Three PLLs integrated on a single chip

n RF PLL fractional-N counter

The LMX3305 contains three Phase Locked Loops (PLL) on

a single chip. It has a RF PLL, an IF Rx PLL and an IF Tx

PLL for CDMA applications. The RF fractional-N PLL uses a

16/17/20/21 quadruple modulus prescaler for PCS applica-

tion and a 8/9/12/13 quadruple modulus prescaler for cellular

application. Both quadruple modulus prescalers offer

modulo 1 through 16 fractional compensation circuitry. The

RF fractional-N PLL can be programmed to operate from 800

MHz to 1400MHz in cellular band and 1200MHz to 2300

MHz in PCS band. The IF Rx PLL and the IF Tx PLL are

integer-N frequency synthesizers that operate from 45 MHz

to 600 MHz with 8/9 dual modulus prescalers. Serial data is

transferred into the LMX3305 via a microwire interface

(Clock, Data, & LE).

n 16/17/20/21 RF quadruple modulus prescaler for PCS

application

n 8/9/12/13 RF quadruple modulus prescaler for cellular

application

n 2.7V to 3.6V operation

n Low current consumption: I_CC= 9 mA (typ) at 3.0V

n Programmable or logical power down mode: I_CC

10 µA (typ) at 3.0V

n RF PLL Fastlock feature with timeout counter

n Digital lock detect

n Microwire Interface with data preset

n 24-pin CSP package

The RF PLL provides a fastlock feature allowing the loop

bandwidth to be increased by 3X during initial lock-on.

Applications

n CDMA Cellular telephone systems

The supply voltage of the LMX3305 ranges from 2.7V to

3.6V. It typically consumes 9 mA of supply current and is

packaged in a 24-pin CSP package.

Block Diagram

DS101361-1

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

DS101361

www.national.com

12 3 4 5 6 7...24

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