Date: 03/09/2009

Linear's new isolator µModule technology for serial data communication

Linear has introduced the LTM2881, an isolated RS485 uModule transceiver that protects from ground-to-ground differentials, common mode transients and the ground potentials vary from node to node, with an interruption of communications or destruction of a transceiver. The self-powered LTM2881 is suitable for safe and reliable communications in RS485 or RS422 systems, industrial network applications.

The LTM2881 breaks ground loops by isolating the logic level interface and line transceiver using internal inductive signal isolation that allows common mode voltage range plus superior common mode rejection of >30kV/uS.

Key features are,

Isolated RS485/RS422 transceiver: 2500VRMS
Integrated isolated DC/DC converter: 1W, 62% efficiency
20Mbps or low EMI 250kbps data rate
High ESD: ±15kV HBM on transceiver interface
High common mode transient immunity: 30kV/µs
Integrated selectable 120O termination
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: 560VPEAK
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 (< 5µA)
General purpose CMOS isolated channel

Package: 11.25 x 15mm x 2.8mm surface mount LGA and BGA package
Price: Starts at $8.45 for 1k pieces
For more details visit www.linear.com