EMC-compliant RS485/RS422 transceivers

29 January 2003 Telecoms, Datacoms, Wireless, IoT

Analog Devices' ADM483 is a low power differential line transceiver suitable for communication on multipoint bus transmission lines. EMI immunity is in excess of 10 V/m meeting IEC1000-4-3. Unwanted emissions are carefully controlled using slew limiting on driver outputs. This limits the data rate to 250 Kbps. The ADM483 is intended for balanced data transmission and complies with both EIA Standards RS485 and RS422. It contains a differential line driver and a differential line receiver, with the driver output and receiver input pins commoned for half-duplex data transmission. Good input impedance allows up to 256 transceivers on the bus, and the device operates from a single 5 V ±10% power supply. Thermal shutdown circuit protects the device and the receiver has a fail-safe feature that forces a logic high output if the inputs float. It is specified over the industrial temperature range.

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