Datasheet > 信号电路 > 锁相环或频率合成电路> LMX2485SQX

LMX2485SQX

更新时间： 2024-11-21 03:04:35

品牌	Logo	应用领域
美国国家半导体 - NSC		半导体信号电路锁相环或频率合成电路
页数	文件大小	规格书
37页	881K
描述
50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer 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

LMX2485SQX 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, 0.8 MM, PLASTIC, LLP-24	Reach Compliance Code：	not_compliant
HTS代码：	8542.39.00.01	风险等级：	5.64
Is Samacsys：	N	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：	HVQCCN
封装等效代码：	LCC24,.16SQ,20	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, 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	技术：	CMOS
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

LMX2485SQX 数据手册

October 2006

LMX2485/LMX2485E

50 MHz - 3.0 GHz High Performance Delta-Sigma Low

™

Power Dual PLLatinum Frequency Synthesizers with

800 MHz Integer PLL

n Direct digital modulation applications

General Description

n Satellite and cable TV tuners

The LMX2485 is a low power, high performance delta-sigma

n WLAN Standards

fractional-N PLL with an auxiliary integer-N PLL. The device

is fabricated using National Semiconductor’s advanced pro-

cess.

Features

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 energy to higher frequencies is a direct function of the

modulator order. Unlike analog compensation, the digital

feedback technique used in the LMX2485 is highly resistant

to changes in temperature and variations in wafer process-

ing. The LMX2485 delta-sigma modulator is programmable

up to fourth order, which allows the designer to select the

optimum modulator order to fit the phase noise, spur, and

lock time requirements of the system.

Quadruple Modulus Prescalers for Lower Divide Ratios

n RF PLL: 8/9/12/13 or 16/17/20/21

n IF PLL: 8/9 or 16/17

Advanced Delta Sigma Fractional Compensation

n 12 bit or 22 bit selectable fractional modulus

n Up to 4th order programmable delta-sigma modulator

Features for Improved Lock Times and Programming

n Fastlock / Cycle slip reduction

n Integrated time-out counter

n Single word write to change frequencies with Fastlock

Serial data for programming the LMX2485 is transferred via

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

The LMX2485 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 modula-

tion applications, where the N counter is directly modulated

with information. The LMX2485 is available in a 24 lead

4.0 X 4.0 X 0.8 mm LLP package.

Wide Operating Range

n LMX2485 RF PLL: 500 MHz to 3.0 GHz

n LMX2485E RF PLL: 50 MHz to 3.0 GHz

Useful Features

n Digital lock detect output

n Hardware and software power-down control

n On-chip crystal reference frequency doubler.

n RF phase comparison frequency up to 50 MHz

n 2.5 to 3.6 volt operation with I_CC= 5.0 mA at 3.0 V

Applications

n Cellular phones and base stations

CDMA, WCDMA, GSM/GPRS, TDMA, EDGE, PDC

Functional Block Diagram

20087701

™

PLLatinum is a trademark of National Semiconductor Corporation.

DS200877

www.national.com

12 3 4 5 6 7...37

中文翻译

下载PDF

与LMX2485SQX相关器件

型号	品牌	获取价格	描述	数据表
LMX2485SQX/NOPB	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 \| RTW \|
LMX2486	NSC	获取价格	1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum TM Frequency Synth
LMX2486	TI	获取价格	用于射频个人通信的 1GHz 至 4.5GHz Δ-Σ 低功耗双路 PLL
LMX2486SQ	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 4500 MHz, PQCC24, 4 X 4 MM, 0.8 MM HEIGHT, PLASTIC, LLP-24,
LMX2486SQ/NOPB	TI	获取价格	用于射频个人通信的 1GHz 至 4.5GHz Δ-Σ 低功耗双路 PLL \| RTW \|
LMX2487	NSC	获取价格	1.0 GHz - 6.0 GHz High Performance Delta-Sigm
LMX2487	TI	获取价格	Low-Power Dual PLLatinum Frequency Synthesizers
LMX2487_08	NSC	获取价格	1.0 GHz - 6.0 GHz High Performance Delta-Sigm
LMX2487E	NSC	获取价格	7.5 GHz High Performance Delta-Sigma Low Powe
LMX2487E	TI	获取价格	用于射频个人通信的 3GHz 至 7.5GHz Δ-Σ 低功耗双路 PLL

与LMX2485SQX相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

27
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

19
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

49
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

47

产品中心

服务支持

精选活动

关于我们

帮助中心

LMX2485SQX

LMX2485SQX 技术参数

LMX2485SQX 数据手册

与LMX2485SQX相关器件

与LMX2485SQX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

LMX2485SQX

LMX2485SQX 技术参数

LMX2485SQX 数据手册

与LMX2485SQX相关器件

与LMX2485SQX相关文章

您还可以找

您在本页遇到什么问题？