Datasheet > LMX2471SLEX

LMX2471SLEX

更新时间： 2024-02-20 07:19:18

品牌	Logo	应用领域
德州仪器 - TI		信息通信管理
页数	文件大小	规格书
33页	571K
描述
PLL FREQUENCY SYNTHESIZER, 3600MHz, QCC24, 3.5 X 4.5 MM, 0.60 MM HEIGHT, TCSP-24

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LMX2471SLEX 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：	5.64	模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER
Base Number Matches：	1

LMX2471SLEX 数据手册

OBSOLETE

LMX2471

www.ti.com

SNAS213A –MAY 2004–REVISED MAY 2004

LMX2471 3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL

Check for Samples: LMX2471

FEATURES

– IF PLL: 8/9 or 16/17

•

Crystal Reference Frequency up to 110 MHz

On-chip crystal reference frequency doubler.

Phase Comparison Frequency up to 50 MHz

Hardware and software power-down control

Ultra low consumption: I_CC= 5.6 mA (typical)

•

Low in-band phase noise and low fractional

spurs

•

12 bit or 22 bit selectable fractional modulus

Up to 4th order programmable delta-sigma

modulator

•

Enhanced Anti-Cycle Slip Fastlock Circuitry

APPLICATIONS

–

Fastlock

Cycle slip reduction

Integrated timeout counters

•

Cellular Phones and Base Stations

Applications requiring fine frequency

resolution

•

Digital lock detect output

•

Satellite and Cable TV Tuners

WLAN Standards

Prescalers allow wide range of N values

–

RF PLL: 16/17/20/21

DESCRIPTION

The LMX2471 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL.

The device is fabricated using National Semiconductor’s advanced BiCMOS process.

With delta-sigma architecture, fractional spur compensation is achieved with noise shaping capability of the delta-

sigma modulator and the inherent low pass filtering of the PLL loop filter. Fractional spurs at lower frequencies

are pushed to higher frequencies outside the loop bandwidth. Unlike analog compensation, the digital feedback

techniques used in the LMX2471 are highly resistant to changes in temperature and variations in wafer

processing. With delta-sigma architecture, the ability to push close in spur and phase noise energy to higher

frequencies is a direct function of the modulator order. The higher the order, the more this energy can be spread

to higher frequencies. The LMX2471 has a programmable modulator up to order four, which allows the designer

to select the optimum modulator order to fit the phase noise, spur, and lock time requirements of the system.

Programming is fast and simple. Serial data is transferred into the LMX2471 via a three line MICROWIRE

interface (Data, Clock, Load Enable). Nominal supply voltage is 2.5 V. The LMX2471 features a typical current

consumption of 5.6 mA at 2.5 V. The LMX2471 is available in a 24 lead 3.5 X 4.5 X 0.6 mm package.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...33

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与LMX2471SLEX相关器件

型号	品牌	获取价格	描述	数据表
LMX2471SLEX/NOPB	NSC	获取价格	IC,PHASE-LOCKED LOOP,BICMOS,LLCC,24PIN,PLASTIC
LMX2485	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485	TI	获取价格	用于射频个人通信的 500MHz 至 3GHz Δ-Σ 低功耗双路 PLL
LMX2485_0610	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485_08	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485E	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485E	TI	获取价格	用于射频个人通信的 50MHz 至 3GHz Δ-Σ 低功耗双路 PLL
LMX2485ESQ	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485ESQ/NOPB	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24, 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24, PLL or
LMX2485ESQ/NOPB	TI	获取价格	用于射频个人通信的 50MHz 至 3GHz Δ-Σ 低功耗双路 PLL \| RTW \|

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