Datasheet > LMX2485E

LMX2485E

更新时间： 2023-09-03 20:31:52

品牌	Logo	应用领域
德州仪器 - TI		通信射频个人通信
页数	文件大小	规格书
48页	1174K
描述
用于射频个人通信的 50MHz 至 3GHz Δ-Σ 低功耗双路 PLL

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LMX2485E 技术参数

生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	HVQCCN,	针数：	24
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.7	模拟集成电路 - 其他类型：	PLL FREQUENCY SYNTHESIZER
JESD-30 代码：	S-PQCC-N24	长度：	4 mm
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
封装形状：	SQUARE	封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
认证状态：	Not Qualified	座面最大高度：	0.8 mm
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	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
宽度：	4 mm	Base Number Matches：	1

LMX2485E 数据手册

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LMX2485, LMX2485E

SNAS236G –OCTOBER 2005–REVISED JANUARY 2016

LMX2485x 3-GHz Delta-Sigma Low-Power Dual PLLatinum™ Frequency Synthesizer

1 Features

3 Description

The LMX2485 device is

performance delta-sigma fractional-N PLL with an

auxiliary integer-N PLL. The device is fabricated

using Texas Instruments' advanced process.

low power, high

•

Quadruple Modulus Prescaler for Lower Divides

–

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

IF PLL: 8/9 or 16/17

•

Advanced Delta-Sigma Fractional Compensation

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 processing. 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.

–

12-Bit or 22-Bit Selectable Fractional Modulus

Up to 4th Order Programmable Delta-Sigma

Modulator

Features for Improved Lock Time

–

Fastlock / Cycle Slip Reduction With Integrated

Time-Out Counter Which Requires Only a

Single-Word Write

•

Wide Operating Range

–

LMX2485 RF PLL: 500 MHz to 3.0 GHz

LMX2485E RF PLL: 50 MHz to 3.0 GHz

Useful Features

Serial data for programming the LMX2485 is

transferred through 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

modulation applications, where the N-counter is

directly modulated with information. The LMX2485 is

available in a 24-lead 4.0 × 4.0 × 0.8 mm WQFN

package.

–

Digital Lock Detect Output

Hardware and Software Power-Down Control

On-Chip Input Frequency Doubler.

RF Phase Detector Frequency up to 50 MHz

2.5 to 3.6 V Operation With I_CC= 5.0 mA

2 Applications

•

Cellular Phones and Base Stations

Direct Digital Modulation Applications

Satellite and Cable TV Tuners

WLAN Standards

Device Information⁽¹⁾

RF PLL Frequency IF PLL Frequency

PART NUMBER

LMX2485E

50 - 3000 MHz

500 - 3000 MHz

75 - 800 MHz

LMX2485

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Functional Block Diagram

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...48

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LMX2485E 替代型号

型号	品牌	替代类型	描述	数据表
LMX2571	TI	功能相似	具有移频键控 (FSK) 调制功能的 1.34GHz、低功耗、极端温度 RF 合成器
LMX2485	TI	功能相似	用于射频个人通信的 500MHz 至 3GHz Δ-Σ 低功耗双路 PLL

与LMX2485E相关器件

型号	品牌	获取价格	描述	数据表
LMX2485ESQ	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485ESQ/NOPB	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24, 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24, PLL or
LMX2485ESQ/NOPB	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 \| RTW \|
LMX2485ESQX	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485ESQX/NOPB	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 \| RTW \|
LMX2485Q-Q1	TI	获取价格	500MHz 至 3GHz 汽车类 Δ-Σ 低功耗双路 PLL
LMX2485QSQ/NOPB	TI	获取价格	500MHz 至 3GHz 汽车类 Δ-Σ 低功耗双路 PLL \| RTW \| 24 \|
LMX2485QSQX/NOPB	TI	获取价格	500MHz 至 3GHz 汽车类 Δ-Σ 低功耗双路 PLL \| RTW \| 24 \|
LMX2485SQ	NSC	获取价格	50 MHz - 3.0 GHz High Performance Delta-Sigma
LMX2485SQ/NOPB	NSC	获取价格	IC PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24, 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24, PLL or

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