ADM485AN

The ADM485AN is a differential line transceiver from Analog Devices, suitable for high-speed bidirectional data communication on multipoint bus transmission lines. It complies with EIA standards RS-485 and RS-422, featuring both a differential line driver and receiver that can be enabled independently. The device operates from a single 5V power supply and boasts a data rate of 5 Mbps.

Key features include thermal shutdown protection and short-circuit protection to prevent damage from excessive power dissipation. The driver propagation delay is typically 10 ns, and the receiver propagation delay is typically 15 ns. The transceiver supports a wide bus common-mode voltage range of -7V to +12V. Its BiCMOS technology combines low power CMOS with fast switching bipolar technology.

Applications for the ADM485AN include low power RS-485 systems, DTE/DCE interfaces, packet switching, local area networks, data concentration, data multiplexers, and integrated services digital networks (ISDN). Up to 32 transceivers can be connected on a bus, with the device designed for high output impedance when disabled or powered down to minimize bus loading.

The ADM485AN is fabricated using BiCMOS technology, offering a balance of speed and low power consumption. All inputs and outputs are protected against ESD, and driver outputs have high source and sink current capability. The receiver includes a fail-safe feature for unconnected inputs.