LTM2881: Complete Isolated RS485/RS422 μModule Transceiver + Power Data Sheet11/23/2016580K
Features and Benefits
- RS485/RS422 Transceiver: 2500VRMS for 1 Minute
- UL-CSA Recognized File #E151738
- CSA Component Acceptance Notice 5A
- Isolated DC Power: 5V at Up to 200mA
- No External Components Required
- 20Mbps or Low EMI 250kbps Data Rate
- High ESD: ±15kV HBM on Transceiver Interface
- High Common Mode Transient Immunity: 30kV/μs
- Integrated Selectable 120Ω Termination
- 3.3V (LTM2881-3) or 5.0V (LTM2881-5) Operation
- 1.62V to 5.5V Logic Supply Pin for Flexible Digital Interface
- Maximum Continuous Working Voltage: 560VPEAK
- High Input Impedance Failsafe RS485 Receiver
- Current Limited Drivers and Thermal Shutdown
- Compatible with TIA/EIA-485-A and PROFIBUS
- High Impedance Output During Internal Fault Condition
- Low Current Shutdown Mode (< 10μA)
- General Purpose CMOS Isolated Channel
- 15mm × 11.25mm BGA and LGA Packages
The LTM2881 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.
- Isolated RS485/RS422 Interface
- Industrial Networks
- Breaking RS485 Ground Loops
- Isolated PROFIBUS-DP Networks
Markets and Technologies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (4)
DC1503A-B: Demo Board for the LTM2881 Complete Isolated RS485/RS422 µModule Transceiver Plus Power.
DC1503A-A: Demo Board for the LTM2881 Complete Isolated RS485/RS422 µModule Transceiver Plus Power.
DC1746A-B: Demo Board for LTM2881 Complete Isolated RS485/RS422 µModule Transceiver + Power.
DC1746A-A: Demo Board for LTM2881 Complete Isolated RS485/RS422 µModule Transceiver + Power.
Documentation & Resources
R596 Reliability Data3/26/201822 K
AN125 - Using the LTM2881 as an Isolated 5V Power Supply2/5/201092K
DC1746A - Demo Manual12/23/2010469K
DC1503A - Demo Manual6/2/2010531K
Digital Isolator Product Selection Guide10/3/20171M
RS485 Quick Guide7/13/2017524K
Ultra Rugged ±60V RS485 Transceivers3/15/2013282K
LTM2881 - Isolated RS485 + 1W Power2/1/20110M
Digital Isolation and Interface Technology Selection Guide2/7/20204 M
Tools & Simulations
LTM2881 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.