Datasheet > LTM2881CV-3

LTM2881CV-3

更新时间： 2022-12-14 17:56:50

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
20页	313K
描述
Complete Isolated RS485/RS422 μModule Transceiver + Power

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LTM2881CV-3 数据手册

LTM2881

Complete Isolated

RS485/RS422 µModule

Transceiver + Power

FEATURES

DESCRIPTION

Isolator ꢀModule Technology

The LTM^®2881 is a complete galvanically isolated full-

duplex RS485/RS422 μModule^®transceiver. No external

components are required. A single supply powers both

sides of the interface through an integrated, isolated, low

noise, efﬁcient 5V output DC/DC converter.

Isolated RS485/RS422 Transceiver: 2500V

RMS

Integrated Isolated DC/DC Converter: 1W, 62% Efﬁciency

No External Components Required

20Mbps or Low EMI 250kbps Data Rate

High ESD: 15kV HꢁM on Transceiver Interface

High Common Mode Transient Immunity: 30kV/μs

Integrated Selectable 120Ω Termination

Coupledinductorsandanisolationpowertransformerprovide

2500V

of isolation between the line transceiver and the

RMS

logic interface. This device is ideal for systems where the

ground loop is broken allowing for large common mode

voltagevariation.Uninterruptedcommunicationisguaranteed

for common mode transients greater than 30kV/ꢀs.

3.3V ꢁLTM2881-3ꢂ or 5.0V ꢁLTM2881-5ꢂ Operation

1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface

Common Mode Working Voltage: 560V

PEAK

High Input Impedance Failsafe RS485 Receiver

Current Limited Drivers and Thermal Shutdown

Compatible with TIA/EIA-485-A Speciﬁcation

High Impedance Output During Internal Fault Condition

Low Current Shutdown Mode ꢁ< 10μAꢂ

Maximum data rates are 20Mbps or 250kbps in slew

limited mode. Transmit data, DI and receive data, RO, are

implemented with event driven low jitter processing. The

receiver has a one-eighth unit load supporting up to 256

nodes per bus. A logic supply pin allows easy interfacing

with different logic levels from 1.62V to 5.5V, independent

of the main supply.

General Purpose CMOS Isolated Channel

Small, Low Proﬁle ꢁ15mm × 11.25mm × 2.8mmꢂ

Surface Mount LGA Package

Enhanced ESD protection allows this part to withstand up

to 15kVꢁhumanbodymodelꢂonthetransceiverinterface

pins to isolated supplies and 10kV through the isolation

barrier to logic supplies without latch-up or damage.

APPLICATIONS

Isolated RS485/RS422 Interface

Industrial Networks

Breaking RS485 Ground Loops

L, LT, LTC, LTM, Linear Technology, μModule and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

Isolated Half-Duplex RS485 μModule Transceiver

LTM2881 Operating Through 35kV/μs CM Transient

3.3V

MULTIPLE SWEEPS

OF COMMON MODE

TRANSIENTS

LTM2881

PWR

500V/DIV

TWISTED-PAIR

CABLE

1V/DIV

2881 TA01a

50ns/DIV

GND

GND2

2881 TA01

2881f

12 3 4 5 6 7...20

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