DC1746A is a isolated RS485/RS422 μModule® transceiver + power demonstration circuit based on LTM®2881. The demo circuit is a 2500VRMS galvanically isolated RS485/RS422 transceiver interface.
This document provides setup and operating instructions for the DC1746A demonstration circuit, which integrates the LTM2881 isolated transceiver. The circuit is designed for EMI optimization with features like a four-layer PCB, bridge capacitors, and common mode filtering. It operates from a single external supply to generate a 5V output across an isolation barrier. The manual includes a quick start procedure, PCB layout, parts list, and safety notices for engineering evaluation purposes only.
The circuit supports half-duplex or full-duplex operation via a switch, with control signals configurable via jumpers. Performance specifications include 20 Mbps maximum data rate and 560V DC isolation. The document also includes a schematic diagram and EMI performance data measured using a GTEM cell.
| Input Supply Range | 3.05V to 35.5V |
|---|---|
| Output Voltage | 5V |
| Maximum Data Rate | 20 Mbps |
| Maximum Working Insulation Voltage | 560V DC |
| Common Mode Transient Immunity | 30 kV/μs |
The maximum data rate is 20 Mbps.
The output voltage is 5V.
Isolation is maintained by the separation of GND and GND2, allowing significant operating voltages and transients without affecting operation.
The maximum working insulation voltage is 560V DC.