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LTM8045IY 其他数据使用手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
稳压芯片
封装:
BGA-40
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LTM8045IY数据手册
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LTM2881
1
2881fc
Typical applicaTion
DescripTion
Complete Isolated
RS485/RS422 µModule
Transceiver + Power
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.
Coupled inductors and an isolation power transformer
provide 2500V
RMS
of isolation between the line transceiver
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.
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.
Enhanced ESD protection allows this part to withstand up
to ±15kV (human body model) on the transceiver interface
pins to isolated supplies and ±10kV through the isolation
barrier to logic supplies without latch-up or damage.
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Isolated Half-Duplex RS485 μModule Transceiver
FeaTures
applicaTions
n
UL Rated RS485/RS422 Transceiver: 2500V
RMS
UL Recognized
®
File #E151738
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: ±15kV HBM on Transceiver Interface
n
High Common Mode Transient Immunity: 30kV/μs
n
Integrated Selectable 120Ω Termination
n
3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation
n
1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface
n
Common Mode Working Voltage: 560V
PEAK
n
High Input Impedance Failsafe RS485 Receiver
n
Current Limited Drivers and Thermal Shutdown
n
Compatible with TIA/EIA-485-A Specification
n
High Impedance Output During Internal Fault Condition
n
Low Current Shutdown Mode (< 10µA)
n
General Purpose CMOS Isolated Channel
n
Small, Low Profile (15mm × 11.25mm)
Surface Mount BGA and LGA Packages
n
Isolated RS485/RS422 Interface
n
Industrial Networks
n
Breaking RS485 Ground Loops
LTM2881 Operating Through 35kV/μs CM Transients
2881 TA01
TWISTED-PAIR
CABLE
AVAILABLE CURRENT:
150mA (LTM2881-5)
100mA (LTM2881-3)
A
V
CC2
5V
RO
V
L
TE
RE
DE
DI
GND GND2
V
CC
3.3V (LTM2881-3)
5V (LTM2881-5)
LTM2881
B
Y
Z
PWR
ISOLATION BARRIER
2881 TA01a
500V/DIV
50ns/DIV
1V/DIV
1V/DIV
DI
MULTIPLE SWEEPS
OF COMMON MODE
TRANSIENTS
RO
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