Datasheet > LMX2487E

LMX2487E

更新时间： 2024-11-22 11:12:23

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	1127K
描述
用于射频个人通信的 3GHz 至 7.5GHz Δ-Σ 低功耗双路 PLL

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LMX2487E

SNAS404B –MAY 2007–REVISED JANUARY 2016

LMX2487E 7.5-GHz, High-Performance, Delta-Sigma Low-Power Dual PLLatinum™

Frequency Synthesizers With 3-GHz Integer PLL

1 Features

3 Description

The LMX2487E device is

performance delta-sigma fractional-N PLL with an

auxiliary integer-N PLL. It is fabricated using TI’s

advanced process.

a low power, high

•

Quadruple Modulus Prescaler for Lower Divids

–

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

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 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 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 that Requires

Single-Word Write

–

Integrated Time-Out Counter

•

Wide Operating Range

LMX2487E RF PLL: 3.0 GHz to 7.5 GHz

Useful Features

–

Serial data for programming the LMX2487E is

transferred through 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 × 4.0 × 0.8 mm WQFN

package.

–

Digital Lock Detect Output

Hardware and Software Power-Down Control

On-Chip Crystal Reference Frequency Doubler

RF Phase Comparison Frequency Up to 50

MHz

–

2.5-V to 3.6-V Operation With I_CC= 8.5 mA at

3.0 V

2 Applications

Device Information⁽¹⁾

•

Cellular Phones and Base Stations

Direct Digital Modulation Applications

Satellite and Cable TV Tuners

WLAN Standards

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LMX2487E

WQFN (24)

4.00 mm × 4.00 mm

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

the end of the data sheet.

Functional Block Diagram

ëddLC1

ëddLC2

LC b ꢂivider

. /ounꢀer

! /ounꢀer

8ꢁ9

CinLC

ꢄbꢅ{/

ꢅ{/in

thase

/omp

/harge

tump

16ꢁ17

trescaler

/touꢀLC

[ꢂ

LC w

ꢂivider

ꢅ{/ouꢀ

ëddwC1

Cꢀesꢀꢁ[ꢂ

ꢃÜó

Cꢀesꢀꢁ[ꢂ

wC w

ꢂivider

1X / 2X

ëddwC2

ëddwC3

ëddwC4

ëddwC5

CinwC

wC [ꢂ

wC b ꢂivider

/ /ounꢀer

16ꢁ17ꢁ20ꢁ21

32ꢁ33ꢁ36ꢁ37

trescaler

/harge

tump

thase

/omp

/touꢀwC

C[ouꢀwC

. /ounꢀer

wC b ꢂivider

FinRF*

! /ounꢀer

/ꢄ

wC Casꢀlock

/[Y

ꢃL/wꢅíLwꢄ

Lnꢀerface

ꢂ!Ç!

Dbꢂ

Compensation

[ꢄ

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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与LMX2487E相关器件

型号	品牌	获取价格	描述	数据表
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
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

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