The LTM®2881 is a complete galvanically isolated full-duplex RS485/RS422 μModule® (micromodule) 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 2500VRMS 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 common mode voltage variation. Uninterrupted communication 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.
