The ADM1485 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus trans- mission lines. It is designed for balanced data transmission and complies with both RS-485 and RS-422 EIA Standards. The part contains a differential driver and receiver, along with a low-power, high-speed BiCMOS process. The ADM1485 also features thermal shutdown protection and short-circuit protection. It is the ideal replacement for the LTC1485.
The ADM1485 is a differential line transceiver designed for high‑speed bidirectional data communication on RS‑485 and RS‑422 buses. It operates from a single 5 V supply and includes thermal shutdown and short‑circuit protection to prevent damage under fault conditions.
The device supports up to 32 transceivers on a bus, with only one driver enabled at a time, and offers a wide common‑mode range of –7 V to +12 V. It is available in PDIP, SOIC, and MSOP packages and is specified for commercial (0 °C‑70 °C) and industrial (–40 °C‑+85 °C) temperature ranges.
| Supply Voltage | 5 V |
|---|---|
| Maximum Data Rate | 30 Mbps |
| Driver Propagation Delay | 10 ns |
| Receiver Propagation Delay | 15 ns |
| Common‑Mode Voltage Range | -7 V to +12 V |
| Package Options | PDIP, SOIC, MSOP |
The ADM1485 operates from a single 5 V power supply.
Up to 32 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at a time.
It includes thermal shutdown protection and short‑circuit protection to prevent excessive power dissipation.
The driver propagation delay is specified as 10 ns.