The ADM2483 differential bus transceiver is an integrated,
galvanically isolated component designed for bidirectional data
communication on balanced, multipoint bus transmission lines. It
complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E). Using
Analog Devices’ iCoupler technology, the ADM2483 combines a
3-channel isolator, a three-state differential line driver, and a
differential input receiver into a single package. The logic side
of the device is powered with either a 5 V or 3 V supply, and the
bus side uses a 5 V supply only. The ADM2483 is slew-limited to
reduce reflections with improperly terminated transmission lines.
The controlled slew rate limits the data rate to 500 kbps. The
device’s input impedance is 96 kΩ, allowing up to 256 transceivers
on the bus. Its driver has an active-high enable feature. The
driver differential outputs and receiver differential inputs are
connected internally to form a differential I/O port. When the
driver is disabled or when VDD1 or VDD2 = 0 V, this imposes minimal
loading on the bus. An active-high receiver disable feature, which
causes the receive output to enter a high impedance state, is
provided as well. The receiver inputs have a true fail-safe feature
that ensures a logic-high receiver output level when the inputs are
open or shorted. This guarantees that the receiver outputs are in a
known state before communication begins and at the point when
communication ends.
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