Datasheet > ADN4664

ADN4664

更新时间： 2024-11-27 12:52:23

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
12页	593K
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LVDS and M-LVDS Circuit Implementation Guide

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ADN4664 数据手册

AN-1177

APPLICATION NOTE

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

LVDS and M-LVDS Circuit Implementation Guide

by Dr. Conal Watterson

INTRODUCTION

LVDS/M-LVDS APPLICATION CONSIDERATIONS

Low voltage differential signaling (LVDS) is a standard for

communicating at high speed in point-to-point applications.

Multipoint LVDS (M-LVDS) is a similar standard for multi-

point applications. Both LVDS and M-LVDS use differential

signaling, a two-wire communication method where receivers

detect data based on the voltage difference between two

complementary electrical signals. This greatly improves noise

immunity and minimizes emissions.

This application note considers the following aspects

concerning LVDS/M-LVDS circuit implementation:

•

Bus types and topologies

Clock distribution applications

Characteristics of LVDS/M-LVDS signaling

Termination and PCB layout

Jitter and skew

Data encoding and synchronization

Isolation

LVDS

LVDS is a lower power alternative to emitter-coupled logic

(ECL) or positive emitter-coupled logic (PECL).The primary

standard for LVDS is TIA/EIA-644. An alternative standard

sometimes used for LVDS is IEEE 1596.3—SCI, scalable

coherent interface. LVDS has been widely adopted for high-

speed backplane, cabled, and board-to-board data transmission

and clock distribution, as well as communication links within a

single PCB.

WHY USE LVDS OR M-LVDS?

LVDS and M-LVDS are compared to other multipoint and point-

to-point protocols in Figure 1. Both standards have low power

requirements. LVDS and M-LVDS are characterized by differential

signaling with a low differential voltage swing. M-LVDS specifies

an increased differential output voltage compared to LVDS in order

to allow for the increased load from a multipoint bus.

Both protocols are designed for high-speed communication.

Typical applications utilize PCB traces or short wired/backplane

links. The common mode range of LVDS is designed for these

applications. M-LVDS has an extended common mode range

compared to LVDS to allow for the additional noise in a multipoint

topology.

Advantages of LVDS include

•

Communication at speeds of up to 1 Gbps or more

Reduced electromagnetic emissions

Increased immunity to noise

Low power operation

Common-mode range allowing differences of up to 1 V

in ground offset

MULTIPOINT

LOW POWER, HIGH SPEED

MEDIUM DISTANCES (MAX. 20m TO 40m)

TYP. DATA RATE: 100Mbps, 200Mbps

M-LVDS

The standard TIA/EIA-899 for multipoint low voltage differ-

ential signaling (M-LVDS) extends LVDS to address multipoint

applications. M-LVDS allows higher speed communication

links than TIA/EIA-485 (RS-485) or controller area network

(CAN) with lower power. See the References section for a list of

the standards referred to in this application note.

LONG DISTANCES (>1km)

TYP. MAX. DATA RATE: 16Mbps

RS-485

ROBUST PROTOCOL

MEDIUM DISTANCES (MAX. 40m)

MAX. DATA RATE: 1Mbps

CAN

POINT-TO-POINT

Additional features of M-LVDS over LVDS include

LOW POWER, HIGH SPEED

SHORT DISTANCES (MAX. 5m TO 10m)

MAX. DATA RATE: >1Gbps

LVDS

•

Increased driver output strength

Controlled transition times

Extended common-mode range

HIGH SPEED

SHORT DISTANCES

MAX. DATA RATE: ~3Gbps

PECL

Option of failsafe receivers for bus idle condition

Figure 1. Comparison of Communication Standards

Rev. 0 | Page 1 of 12

12 3 4 5 6 7...12

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与ADN4664相关器件

型号	品牌	获取价格	描述	数据表
ADN4664BRZ	ADI	获取价格	Dual, 3 V, CMOS, LVDS Differential Line Receiver
ADN4664BRZ-REEL7	ADI	获取价格	Dual, 3 V, CMOS, LVDS Differential Line Receiver
ADN4665	ADI	获取价格	3 V, LVDS, Quad, CMOS Differential Line Driver
ADN4665ARUZ	ADI	获取价格	3 V, LVDS, Quad, CMOS Differential Line Driver
ADN4665ARUZ-REEL7	ADI	获取价格	3 V, LVDS, Quad, CMOS Differential Line Driver
ADN4665ARZ	ADI	获取价格	3 V, LVDS, Quad, CMOS Differential Line Driver
ADN4665ARZ-REEL7	ADI	获取价格	3 V, LVDS, Quad, CMOS Differential Line Driver
ADN4666	ADI	获取价格	3 V, LVDS, Quad CMOS Differential Line Receiver
ADN4666ARUZ	ADI	获取价格	3 V, LVDS, Quad CMOS Differential Line Receiver
ADN4666ARUZ-REEL7	ADI	获取价格	3 V, LVDS, Quad CMOS Differential Line Receiver

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