Datasheet > LMX2471

LMX2471

更新时间： 2024-01-15 03:07:10

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
36页	453K
描述
3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL

阅读下载

中文翻译

获取价格

技术参数
数据手册

如果您发现信息不准确，欢迎纠错

LMX2471 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	QCCN, LCC24,.17X.14,20	Reach Compliance Code：	unknown
风险等级：	5.84	JESD-30 代码：	R-PQCC-N24
湿度敏感等级：	2	端子数量：	24
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	QCCN
封装等效代码：	LCC24,.17X.14,20	封装形状：	RECTANGULAR
封装形式：	CHIP CARRIER	电源：	2.5 V
认证状态：	Not Qualified	子类别：	PLL or Frequency Synthesis Circuits
标称供电电压 (Vsup)：	2.5 V	表面贴装：	YES
技术：	BICMOS	温度等级：	INDUSTRIAL
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	QUAD	Base Number Matches：	1

LMX2471 数据手册

November 2003

LMX2471

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

Integer-N PLL

General Description

Features

n Low in-band phase noise and low fractional spurs

n 12 bit or 22 bit selectable fractional modulus

n Up to 4th order programmable delta-sigma modulator

n Enhanced Anti-Cycle Slip Fastlock Circuitry

Fastlock

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 BiC-

MOS 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 ana-

log compensation, the digital feedback techniques used in

the LMX2471 are highly resistant to changes in temperature

and variations in wafer processing. With delta-sigma archi-

tecture, the ability to push close in spur and phase noise

energy to higher frequencies is a direct function of the modu-

lator order. The higher the order, the more this energy can be

spread to higher frequencies. The LMX2471 has a program-

mable 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.

Cycle slip reduction

Integrated timeout counters

n Digital lock detect output

n Prescalers allow wide range of N values

RF PLL: 16/17/20/21

IF PLL: 8/9 or 16/17

n Crystal Reference Frequency up to 110 MHz

n On-chip crystal reference frequency doubler.

n Phase Comparison Frequency up to 50 MHz

n Hardware and software power-down control

n Ultra low consumption: I_CC= 5.6 mA (typical)

Applications

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.

n Cellular Phones and Base Stations

n Applications requiring fine frequency resolution

n Satellite and Cable TV Tuners

n WLAN Standards

Functional Block Diagram

20072101

DS200721

www.national.com

12 3 4 5 6 7...36

中文翻译

下载PDF

与LMX2471相关器件

型号	品牌	获取价格	描述	数据表
LMX2471SLEX	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 3600 MHz, QCC24, 3.5 X 4.5 MM, 0.60 MM HEIGHT, TCSP-24, PLL
LMX2471SLEX	TI	获取价格	PLL FREQUENCY SYNTHESIZER, 3600MHz, QCC24, 3.5 X 4.5 MM, 0.60 MM HEIGHT, TCSP-24
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

产品中心

服务支持

精选活动

关于我们

帮助中心

LMX2471

LMX2471 技术参数

LMX2471 数据手册

与LMX2471相关器件

与LMX2471相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LMX2471

LMX2471 技术参数

LMX2471 数据手册

与LMX2471相关器件

与LMX2471相关文章

您还可以找

您在本页遇到什么问题？