Datasheet > LMX2486SQ

LMX2486SQ

更新时间： 2024-01-17 16:28:50

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
37页	859K
描述
IC PLL FREQUENCY SYNTHESIZER, 4500 MHz, PQCC24, 4 X 4 MM, 0.8 MM HEIGHT, PLASTIC, LLP-24, PLL or Frequency Synthesis Circuit

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LMX2486SQ 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 HEIGHT, PLASTIC, LLP-24	Reach Compliance Code：	not_compliant
HTS代码：	8542.39.00.01	风险等级：	5.43
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

LMX2486SQ 数据手册

January 2006

LMX2486

1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low

™

Power Dual PLLatinum Frequency Synthesizers with

3.0 GHz Integer PLL

n Direct digital modulation applications

General Description

n Satellite and cable TV tuners

The LMX2486 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 LMX2486 is highly resistant

to changes in temperature and variations in wafer process-

ing. The LMX2486 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: 16/17/20/21 or 32/33/36/37

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 LMX2486 is transferred via

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

The LMX2486 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 LMX2486 is available in a 24 lead

4.0 X 4.0 X 0.8 mm LLP package.

Wide Operating Range

n LMX2486 RF PLL: 1.0 GHz to 4.5 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= 8.5 mA at 3.0 V

Applications

n Cellular phones and base stations

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

Functional Block Diagram

20156901

™

PLLatinum is a trademark of National Semiconductor Corporation.

DS201569

www.national.com

12 3 4 5 6 7...37

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与LMX2486SQ相关器件

型号	品牌	获取价格	描述	数据表
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
LMX2487ESQ	NSC	获取价格	7.5 GHz High Performance Delta-Sigma Low Powe
LMX2487ESQ/NOPB	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 \| RTW \|
LMX2487ESQE/NOPB	TI	获取价格	Delta-Sigma Low Power Dual PLL for RF Personal Communications 24-WQFN -40 to 85
LMX2487ESQX	NSC	获取价格	7.5 GHz High Performance Delta-Sigma Low Powe

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