Datasheet > LMX2355SLB

LMX2355SLB

更新时间： 2024-09-20 22:18:51

品牌	Logo	应用领域
美国国家半导体 - NSC		半导体射频
页数	文件大小	规格书
23页	405K
描述
PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer

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LMX2355SLB 数据手册

August 2001

LMX2354

PLLatinum Fractional N RF/ Integer N IF Dual Low Power

Frequency Synthesizer

LMX2354 2.5 GHz/550 MHz

General Description

Features

n Pin compatible/functional equivalent to the LMX2350

n Enhanced Low Noise Fractional Engine

n 2.7V to 5.5V operation

The LMX2354 is part of a family of monolithic integrated

fractional N/Integer N frequency synthesizers designed to be

used in a local oscillator subsystem for a radio transceiver. It

is fabricated using National’s 0.5 µ ABiC V silicon BiCMOS

process. The LMX2354 contains quadruple modulus pres-

calers along with modulo 15 or 16 fractional compensation

circuitry in the RF divider. The LMX2354 provides a continu-

ous divide ratio of 80 to 32767 in 16/17/20/21

(1.2 GHz–2.5 GHz) fractional mode and 40 to 16383 in

8/9/12/13 (550 MHz–1.2 GHz) fractional mode. The IF cir-

cuitry for the LMX2354 contains an 8/9 prescaler, and is fully

programmable. Using a fractional N phase locked loop tech-

nique, the LMX2354 can generate very stable low noise

control signals for UHF and VHF voltage controlled oscilla-

tors (VCOs).

n Low current consumption

LMX2354: I_CC= 7 mA typical at 3V

n Programmable or logical power down mode:

I_CC= 5 µA typical at 3V

n Modulo 15 or 16 fractional RF N divider supports ratios

of 1, 2, 3, 4, 5, 8, 15, or 16

n Programmable charge pump current levels

RF 100 µA to 1.6 mA in 100 µA steps

IF 100 µA or 800 µA

n Digital filtered lock detect

n Available in 24-pin TSSOP and 24-pin CSP

For the RF PLL, a highly flexible 16 level programmable

charge pump supplies output current magnitudes from 100

µA to 1.6 mA. Two uncommitted CMOS outputs can be used

to provide external control signals, or configured to FastLock

mode. Serial data is transferred into the LMX2354 via a three

wire interface (Data, LE, Clock). Supply voltage can range

from 2.7V to 5.5V. The LMX2354 family features very low

current consumption; typically LMX2354 (2.5 GHz) — 7.0

mA. The LMX2354 are available in a 24-pin TSSOP surface

mount plastic package and 24-pin CSP.

Applications

n Portable wireless communications (PCS/PCN, cordless)

n Dual mode cellular telephone systems

n Zero blind slot TDMA systems

n Spread spectrum communication systems (CDMA)

n Cable TV Tuners (CATV)

Functional Block Diagram

20004801

DS200048

www.national.com

12 3 4 5 6 7...23

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与LMX2355SLB相关器件

型号	品牌	获取价格	描述	数据表
LMX2355TM	NSC	获取价格	PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
LMX2360TM	ROCHESTER	获取价格	PLL Frequency Synthesizer, BICMOS, PDSO24, PLASTIC, TSSOP-24
LMX2360TM	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 2500MHz, PDSO24, PLASTIC, TSSOP-24
LMX2360TM	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24, PLASTIC, TSSOP-24, PLL or Frequency Synthe
LMX2360TMX	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 2500MHz, PDSO24, PLASTIC, TSSOP-24
LMX2360TMX	ROCHESTER	获取价格	PLL Frequency Synthesizer, BICMOS, PDSO24, PLASTIC, TSSOP-24
LMX2360TMX	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 2500 MHz, PDSO24, PLASTIC, TSSOP-24, PLL or Frequency Synthe
LMX2362TM	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 1200MHz, PDSO24, PLASTIC, TSSOP-24
LMX2362TM	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO24, PLASTIC, TSSOP-24, PLL or Frequency Synthe
LMX2362TMX	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 1200MHz, PDSO24, PLASTIC, TSSOP-24

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