30 Mbps profibus RS485 transceiver

12 March 2003 Telecoms, Datacoms, Wireless, IoT

The ADM1486 is a differential line transceiver from Analog Devices suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission, complies with EIA Standards RS485 and RS422, and is recommended for Profibus applications.

The device contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled or with power off, the driver outputs are high impedance. The ADM1486 operates from a single 5 V power supply. Short circuit protection circuits limit the maximum output current to ±150 mA during fault conditions. A thermal shutdown circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition.

Up to 50 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at any given time. It is important, therefore, that the remaining disabled drivers do not load the bus. To ensure this, the ADM1486 driver features high output impedance when disabled and also when powered down.

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