Datasheet > 信号电路 > 锁相环或频率合成电路> LMX2487ESQX

LMX2487ESQX

更新时间： 2024-09-23 03:34:51

品牌	Logo	应用领域
美国国家半导体 - NSC		信号电路锁相环或频率合成电路
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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技术参数
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LMX2487ESQX 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
包装说明：	4 X 4 MM, 0.80 MM HEIGHT, LLP-24	Reach Compliance Code：	not_compliant
HTS代码：	8542.39.00.01	风险等级：	5.43
其他特性：	QUADRUPLE MODULUS PRESCALER (RF):16/17/20/21 OR 32/33/36/37	模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER
JESD-30 代码：	S-PQCC-N24	JESD-609代码：	e0
长度：	4 mm	湿度敏感等级：	2
功能数量：	1	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：	VQCCN
封装等效代码：	LCC24,.16SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, VERY THIN PROFILE	电源：	3 V
认证状态：	Not Qualified	座面最大高度：	0.8 mm
子类别：	PLL or Frequency Synthesis Circuits	最大供电电压 (Vsup)：	3.6 V
最小供电电压 (Vsup)：	2.5 V	标称供电电压 (Vsup)：	3 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn85Pb15)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
宽度：	4 mm	Base Number Matches：	1

LMX2487ESQX 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LMX2487ESQX相关器件

型号	品牌	获取价格	描述	数据表
LMX2487ESQX/NOPB	TI	获取价格	Delta-Sigma Low Power Dual PLL for RF Personal Communications 24-WQFN -40 to 85
LMX2487ESQX/NOPB	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 7500 MHz, PQCC24, 4 X 4 MM, 0.80 MM HEIGHT, LEAD FREE, LLP-2
LMX2487SQ	TI	获取价格	Low-Power Dual PLLatinum Frequency Synthesizers
LMX2487SQ	NSC	获取价格	3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum? Frequency Synthes
LMX2487SQ/NOPB	TI	获取价格	Low-Power Dual PLLatinum Frequency Synthesizers
LMX2487SQX	NSC	获取价格	3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum? Frequency Synthes
LMX2487SQX	TI	获取价格	Low-Power Dual PLLatinum Frequency Synthesizers
LMX2487SQX/NOPB	TI	获取价格	1 to 6 GHz Delta-Sigma Low Power Dual PLLatinum Frequency Synthesizer with 3.0 GHz Integer
LMX2491	TI	获取价格	具有斜坡/线性调频脉冲生成功能的 6.4GHz 低噪声分数 N PLL
LMX2491RTWR	TI	获取价格	具有斜坡/线性调频脉冲生成功能的 6.4GHz 低噪声分数 N PLL \| RTW \| 2

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