Datasheet > LMX2350TM

LMX2350TM

更新时间： 2024-09-20 22:36:15

品牌	Logo	应用领域
美国国家半导体 - NSC		射频光电二极管信息通信管理
页数	文件大小	规格书
20页	381K
描述
PLLatinum⑩ Fractional N RF / Integer N IF Dual Low Power Frequency Synthesizer

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中文翻译

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数据手册

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LMX2350TM 数据手册

PRELIMINARY

June 1999

LMX2350/LMX2352

™

PLLatinum Fractional N RF / Integer N IF

Dual Low Power Frequency Synthesizer

LMX2350 2.5 GHz/550 MHz

2352 family features very low current consumption; typically

LMX2350 (2.5 GHz) 6.75 mA, LMX2352 (1.2 GHz) 5.00 mA

at 3.0V. The LMX2350/2352 are available in a 24-pin TSSOP

surface mount plastic package.

LMX2352 1.2 GHz/550 MHz

General Description

The LMX2350/2352 is part of a family of monolithic inte-

grated fractional N/ Integer N frequency synthesizers de-

signed to be used in a local oscillator subsystem for a radio

transceiver. It is fabricated using National’s 0.5µ ABiC V sili-

con BiCMOS process. The LMX2350/2352 contains dual

modulus prescalers along with modulo 15 or 16 fractional

compensation circuitry in the RF divider. A 16/17 or 32/33

prescale ratio can be selected for the LMX2350, and the

LMX2352 provides 8/9 or 16/17 prescale ratios. The IF cir-

cuitry for both the LMX2350 and LMX2352 contains an 8/9

prescaler, and is fully programmable. Using a fractional N

phase locked loop technique, the LMX2350 /52 can gener-

ate very stable low noise control signals for UHF and VHF

voltage controlled oscillators (VCO’s).

Features

n 2.7 V to 5.5 V operation

n Low current consumption

LMX2350: Icc = 6.75mA typ at 3v

LMX2352: Icc = 5.00mA typ at 3v

n Programmable or logical power down mode

Icc = 5 µA typ 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 100µA to 1.6mA in 100µA steps

IF 100µA or 800 µA

n Digital filtered lock detect

For the RF PLL, a highly flexible 16 level programmable

charge pump supplies output current magnitudes from

100µA to 1.6mA. Two uncommitted CMOS outputs can be

used to provide external control signals, or configured to

Applications

n Portable wireless communications (PCS/PCN, cordless)

n Dual mode cellular telephone systems

n Zero blind slot TDMA systems

™

FastLock

mode. Serial data is transferred into the

n Spread spectrum communication systems (CDMA)

n Cable TV Tuners (CATV)

LMX2350/2352 via a three wire interface (Data, LE, Clock).

Supply voltage can range from 2.7 V to 5.5 V. The LMX2350/

Block Diagram

DS100831-1

™

FastLock is a trademark of National Semiconductor Corporation.

™

MICROWIRE is a trademark of National Semiconductor Corporation.

™

PLLatinum is a trademark of National Semiconductor Corporation.

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

DS100831

www.national.com

12 3 4 5 6 7...20

中文翻译

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与LMX2350TM相关器件

型号	品牌	获取价格	描述	数据表
LMX2350TM/NOPB	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 2500MHz, PDSO24, PLASTIC, TSSOP-24
LMX2350TMX	ETC	获取价格	Serial-Input Frequency Synthesizer
LMX2350TMX/NOPB	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 2500MHz, PDSO24, PLASTIC, TSSOP-24
LMX2352	ETC	获取价格
LMX2352TM	ROCHESTER	获取价格	PLL FREQUENCY SYNTHESIZER, 1200MHz, PDSO24, PLASTIC, TSSOP-24
LMX2352TM	NSC	获取价格	PLLatinum⑩ Fractional N RF / Integer N IF Dua
LMX2352TM/NOPB	ROCHESTER	获取价格	PLL FREQUENCY SYNTHESIZER, 1200MHz, PDSO24, PLASTIC, TSSOP-24
LMX2352TMX	ETC	获取价格	Serial-Input Frequency Synthesizer
LMX2352TMX/NOPB	TI	获取价格	IC PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO24, LEAD FREE, PLASTIC, TSSOP-24, PLL or Frequ
LMX2353	NSC	获取价格	PLLatinum⑩ Fractional N Single 2.5 GHz Freque

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