2.5KV Isolated RS232-TTL/CMOS Converter/Driver/Receiver

The ADM3251E is a transceiver which has a high speed, 2.5 kV fully isolated, single channel RS-232/V.28. This device is operates from a single 5 V power supply. The device is ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently being plugged and unplugged due to the high ESD protection on the RIN and TOUT pins.

The ADM3251E incorporates dual-channel digital isolators with isoPower™ integrated, isolated power. To use a separate isolated dc-to-dc converter needn’t a requirement. Both is used by Chip-scale trans-former iCoupler® technology from Analog Devices, Inc. for the isolation of the logic signals as well as for the integrated dc-to-dc converter. A total isolation solution is the result.

The ADM3251E contains isoPower technology. This technology uses high frequency switching elements to transfer power through the transformer. During printed circuit board (PCB) layout, we have to do special care to meet emissions standards. For details on board layout considerations, Refer to Application Note AN-0971, Control of Radiated Emissions with isoPower Devices. [Circuit’s schematic diagram source: Analog Devices]