LTM2881 - Complete Isolated RS485/RS422 μModule Transceiver + Power

Features

• Click Here for LTM2881 Evaluation Kit
• Isolated RS485/RS422 Transceiver: 2500V_RMS
• 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
• Common Mode Working Voltage: 560V_PEAK
• 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)
• General Purpose CMOS Isolated Channel
• Small, Low Profile (15mm × 11.25mm × 2.8mm) Surface Mount BGA and LGA Packages

Typical Application

Description

The LTM2881 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 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.

Packaging

15mm x 11mm x 2.8mm BGA or LGA

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTM2881CV-3#PBF	LGA	32	C	$12.07	$8.45	View
LTM2881CV-5#PBF	LGA	32	C	$12.07	$8.45	View
LTM2881CY-3#PBF	BGA	32	C	$12.07	$8.45	View
LTM2881CY-5#PBF	BGA	32	C	$12.07	$8.45	View
LTM2881IV-3#PBF	LGA	32	I	$14.24	$9.97	View
LTM2881IV-5#PBF	LGA	32	I	$14.24	$9.97	View
LTM2881IY-3#PBF	BGA	32	I	$14.24	$9.97	View
LTM2881IY-5#PBF	BGA	32	I	$14.24	$9.97	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number	Description	Price
DC1503A-A	LTM2881-3 uModule transceiver demoboard (3.3V input supply)	$50.00
DC1503A-B	LTM2881-5 uModule transceiver demoboard (5.0V input supply)	$50.00
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Applications

• Isolated RS485/RS422 Interface
• Industrial Networks
• Breaking RS485 Ground Loops

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