Linear Technology: DC1746A Demo Board for LTM2881 Isolated RS485/RS422 μModule Transceiver + Power

atomar — Wed, 25 Jun 2014 00:52:46 GMT

Current Revision posted to Documents by atomar on 6/25/2014 12:52:46 AM

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Kit Overview

Demonstration circuit DC1746ADC1746A is an isolated RS485/RS422 μModule® transceiver + power featuring the LTM2881LTM2881. The demo circuit is a 2500VRMS galvanically isolated RS485/RS422 transceiver interface. The demo circuit features an EMI optimized circuit confi guration and printed circuit board layout. All components are integrated into the μModule transceiver. The demo circuit operates from a single external supply on VCC. The part generates the output voltage VCC2 and communicates all necessary signaling across the isolation barrier using LTC’s isolator μModule technology.

The LTM2881LTM2881 is a complete galvanically isolated fullduplex 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.

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.

Ordering Information:

MPN	Description
DC1746A-ADC1746A-A	LTM2881-3LTM2881-3 low EMI test board (for EMI evaluation purposes only,no VL & no GPIO)
DC1746A-BDC1746A-B	LTM2881-5LTM2881-5 low EMI test board (for EMI evaluation purposes only,no VL & no GPIO)

Key Applications: Isolated RS485/RS422 Interface, Industrial Networks, Breaking RS485 Ground Loops, Isolated PROFIBUS-DP Networks

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Technical Documents

Learning Center

Type	Description
User Manual	LTC: Demo Manual for DC1746A - LTM2881 Isolated RS485/RS422 μModule Transceiver + Power
User Guide	LTC: RS485 Quick Guide
Datasheet	LTC: Datasheet for LTM2881 - Complete Isolated Complete Isolated Transceiver + Power
Product Brief	LTC: Product Brief for Isolated RS485 & RS232 μModule Transceivers Now Specified for -55°C to 105°C for Military & Automotive Applications
Product Brief	LTC: Product Brief for RequiredIsolated RS485 + 1W Power
Product Brief	LTC: Product Brief for Ultra Rugged ±60V RS485 Transceivers
Whitepaper	LTC: White Paper for Isolated Data Transmission and Power Conversion Integrated Into a Surface Mount Package
Application Note	LTC: AN125 - Application Note for Using the LTM2881 as an Isolated 5V Power Supply

Design Elements

Type	Description
Schematics	LTC: Schematic File for DC1746A
Layout	LTC: Layout File for DC1746A
BOM	LTC: BOM File for DC1746A

Video

Video1	Video2
www.youtube.com/watch	www.youtube.com/watch

Kit Features

Features of LTM2881LTM2881:

UL Rated RS485/RS422 Transceiver: 2500V_RMSUL Recognized ® File #E151738
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 (LTM2881-3LTM2881-3) or 5.0V (LTM2881-5LTM2881-5) 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 and PROFIBUS
High Impedance Output During Internal Fault Condition
Low Current Shutdown Mode (< 10μA)
General Purpose CMOS Isolated Channel
Small, Low Profile (15mm × 11.25mm) Surface Mount BGA and LGA Packages

Kit Contents

The Linear Technology's DC1746A-ADC1746A-A supplied with below contents:
- DC1746A-ADC1746A-A Demo Board
The Linear Technology's DC1746A-BDC1746A-B supplied with below contents:
- DC1746A-BDC1746A-B Demo Board

Tags: ltm2881-3, dc1746a-a, demo_board, ltm2881, linear_technology, ltm2881-5, dc1746a, dc1746a-b