High speed isolated RS485 transceiver
30 June 2004
Telecoms, Datacoms, Wireless, IoT
Infrastructure
The ADM24861 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. This Analog Devices product is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A and ISO 8482:1987(E).
The part employs Analog Devices' iCoupler technology to combine a 3-channel isolator, a 3-state differential line driver, and a differential input receiver into a single package. The logic side of the device can be powered with either a 5 V or a 3 V supply while the bus side is powered with a 5 V supply.
The ADM2486 driver has an active high enable. The driver differential outputs and the receiver differential inputs are connected internally to form a differential input/output port that imposes minimal loading on the bus when the driver is disabled or when VDD1 or VDD2 = 0. Also provided is an active high receiver disable that causes the receive output to enter a high impedance state.
The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention might cause excessive power dissipation.
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