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LTM2881CV-3-PBF PDF预览

LTM2881CV-3-PBF

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
22页 456K
描述
Complete Isolated RS485/RS422 μModule Transceiver + Power

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LTM2881CV-3-PBF 数据手册

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LTM2881  
Complete Isolated  
RS485/RS422 µModule  
Transceiver + Power  
FeaTures  
DescripTion  
n
Isolated RS485/RS422 Transceiver: 2500V  
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.  
RMS  
n
Isolated DC Power: 5V at Up to 200mA  
n
No External Components Required  
n
20Mbps or Low EMI 250kbps Data Rate  
n
High ESD: ±±5kV HꢀM on Transceiver Interface  
High Common Mode Transient Immunity: 30kV/μs  
Integrated Selectable ±20Ω Termination  
n
n
n
n
n
n
n
n
n
n
n
n
Coupled inductors and an isolation power transformer  
provide2500V  
ofisolationbetweenthelinetransceiver  
RMS  
3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation  
1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface  
Common Mode Working Voltage: 560V  
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 (< 10µA)  
and the logic interface. This device is ideal for systems  
where the ground loop is broken allowing for large com-  
mon mode voltage variation. Uninterrupted communica-  
tion is guaranteed for common mode transients greater  
than 30kV/μs.  
PEAK  
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 × 2.8mm)  
Surface Mount BGA and LGA Packages  
applicaTions  
Enhanced ESD protection allows this part to withstand up  
to 15kV(humanbodymodel)onthetransceiverinterface  
pins to isolated supplies and 10kV through the isolation  
barrier to logic supplies without latch-up or damage.  
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Isolated RS485/RS422 Interface  
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Industrial Networks  
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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  
LTM288± Operating Through 35kV/μs CM Transients  
3.3V  
MULTIPLE SWEEPS  
OF COMMON MODE  
TRANSIENTS  
V
CC  
LTM2881  
AVAILABLE CURRENT:  
150mA (LTM2881-5)  
100mA (LTM2881-3)  
V
5V  
CC2  
A
PWR  
500V/DIV  
V
L
RO  
B
RE  
DI  
TWISTED-PAIR  
CABLE  
RO  
TE  
DE  
1V/DIV  
1V/DIV  
Y
Z
DI  
2881 TA01a  
50ns/DIV  
GND  
GND2  
2881 TA01  
2881fa  
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