ADM1485JR

Overview

The ADM1485JR is a differential line transceiver designed for high-speed bidirectional data communication on multipoint bus transmission lines. It complies with EIA RS-485 and RS-422 standards, featuring a single driver and receiver within an 8-lead SOIC package. The device operates from a single 5 V power supply with a typical operating current of 2.2 mA when enabled. It supports data rates up to 30 Mbps, with driver propagation delays as low as 10 ns and receiver delays at 15 ns. The component functions over the commercial temperature range of 0°C to 70°C.

Feature Summary

• Thermal shutdown protection prevents excessive power dissipation during fault conditions by disabling outputs upon detecting significant internal temperature increases.
• Fail-safe receiver design ensures a logic high output state when inputs are unconnected or floating, maintaining signal integrity.
• High output impedance in disabled and powered-down states minimizes bus loading effects across the full common-mode voltage range.

Applications

• Low Power RS-485 Systems
• DTE-DCE Interface
• Packet Switching

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm RoHS compliance status through the designated Z suffix if required. Ensure the selected variant matches the intended board layout dimensions and thermal requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring half-duplex communication with minimal propagation delay. Verify that the system operates within the specified 5 V supply tolerance and does not exceed the absolute maximum ratings for input voltages. Consider the thermal management capabilities if multiple units share a dense bus topology.

Part Context

This part belongs to the ADM1485 series of low-power RS-485 transceivers manufactured by Analog Devices. It serves as a successor to older components like the LTC1485, offering improved switching speeds and lower power consumption while maintaining compatibility with standard RS-485 network architectures.

Replacement Considerations

The datasheet identifies the ADM1485 as a superior upgrade for the LTC1485. Verify pinout compatibility and electrical specifications before substituting other RS-485 transceivers in existing designs.