LMX2487E

更新时间： 2024-02-12 05:05:36

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
38页	733K
描述
7.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL

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LMX2487E 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	包装说明：	QCCN, LCC24,.16SQ,20
Reach Compliance Code：	compliant	ECCN代码：	5A991.G
HTS代码：	8542.39.00.01	风险等级：	5.68
模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER	JESD-30 代码：	S-PQCC-N24
JESD-609代码：	e3	湿度敏感等级：	3
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,.16SQ,20
封装形状：	SQUARE	封装形式：	CHIP CARRIER
峰值回流温度（摄氏度）：	260	电源：	3 V
认证状态：	Not Qualified	子类别：	PLL or Frequency Synthesis Circuits
标称供电电压 (Vsup)：	3 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

LMX2487E 数据手册

May 2007

LMX2487E

7.5 GHz High Performance Delta-Sigma Low Power Dual

PLLatinum™ Frequency Synthesizers with 3.0 GHz Integer

PLL

WLAN Standards

■

General Description

The LMX2487E is a low power, high performance delta-sigma

Features

fractional-N PLL with an auxiliary integer-N PLL. It is fabricat-

ed using National Semiconductor’s advanced process.

Quadruple Modulus Prescalers for Lower Divide Ratios

With delta-sigma architecture, fractional spurs at lower offset

frequencies are pushed to higher frequencies outside the loop

bandwidth. The ability to push close in spur and phase noise

RF PLL: 16/17/20/21 or 32/33/36/37

■

IF PLL: 8/9 or 16/17

■

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

ulator order. Unlike analog compensation, the digital feed-

back technique used in the LMX2487E is highly resistant to

changes in temperature and variations in wafer processing.

The LMX2487E delta-sigma modulator is programmable up

to fourth order, which allows the designer to select the opti-

mum modulator order to fit the phase noise, spur, and lock

time requirements of the system.

Advanced Delta Sigma Fractional Compensation

12 bit or 22 bit selectable fractional modulus

■

Up to 4th order programmable delta-sigma modulator

Features for Improved Lock Times and Programming

Fastlock / Cycle slip reduction

■

Integrated time-out counter

Serial data for programming the LMX2487E is transferred via

a three line high speed (20 MHz) MICROWIRE interface. The

LMX2487E offers fine frequency resolution, low spurs, fast

programming speed, and a single word write to change the

frequency. This makes it ideal for direct digital modulation

applications, where the N counter is directly modulated with

information. The LMX2487E is available in a 24 lead

4.0 X 4.0 X 0.8 mm LLP package.

Single word write to change frequencies with Fastlock

Wide Operating Range

LMX2487E RF PLL: 3.0 GHz to 7.5 GHz

■

Useful Features

Digital lock detect output

■

Hardware and software power-down control

On-chip crystal reference frequency doubler.

Applications

RF phase comparison frequency up to 50 MHz

Cellular phones and base stations

■

2.5 to 3.6 volt operation with I_CC= 8.5 mA at 3.0 V

■

Direct digital modulation applications

Satellite and cable TV tuners

Functional Block Diagram

30013901

PLLatinum™ is a trademark of National Semiconductor Corporation.

300139

www.national.com

12 3 4 5 6 7...38

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与LMX2487E相关器件

型号	品牌	描述	获取价格	数据表
LMX2487ESQ	NSC	7.5 GHz High Performance Delta-Sigma Low Powe	获取价格
LMX2487ESQ/NOPB	TI	用于射频个人通信的 3GHz 至 7.5GHz Δ-Σ 低功耗双路 PLL \| RTW \|	获取价格
LMX2487ESQE/NOPB	TI	Delta-Sigma Low Power Dual PLL for RF Personal Communications 24-WQFN -40 to 85	获取价格
LMX2487ESQX	NSC	7.5 GHz High Performance Delta-Sigma Low Powe	获取价格
LMX2487ESQX/NOPB	TI	Delta-Sigma Low Power Dual PLL for RF Personal Communications 24-WQFN -40 to 85	获取价格
LMX2487ESQX/NOPB	NSC	IC PLL FREQUENCY SYNTHESIZER, 7500 MHz, PQCC24, 4 X 4 MM, 0.80 MM HEIGHT, LEAD FREE, LLP-2	获取价格

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