ADM1485ARMZ-REEL

Overview

The ADM1485ARMZ-REEL 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 MSOP package. The device operates from a single 5 V power supply with a typical data rate of 30 Mbps. Key electrical parameters include a bus common-mode range of –7 V to +12 V, a maximum supply current of 2.2 mA when enabled, and propagation delays of 10 ns for the driver and 15 ns for the receiver. It functions reliably across an industrial temperature range of –40°C to +85°C.

Feature Summary

• Thermal shutdown protection prevents damage during fault conditions by disabling outputs at elevated temperatures.
• Fail-safe receiver design ensures a logic high output state when inputs are unconnected or floating.
• High output impedance in disabled and powered-down states minimizes bus loading effects.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and reel quantity. Ensure the component meets RoHS compliance requirements if mandated by your project specifications. Cross-reference the part number with authorized distributors to confirm availability and authenticity before procurement.

Selection Notes

Select this component for applications requiring high-speed data rates up to 30 Mbps over multipoint buses. Consider the 8-lead MSOP package for space-constrained designs. Verify that the system voltage aligns with the single 5 V supply requirement and that the operating environment falls within the specified industrial temperature range.

Part Context

This component belongs to the ADM1485 series of low-power EIA RS-485 transceivers manufactured by Analog Devices Inc. It serves as a successor to the LTC1485 model, offering improved performance characteristics while maintaining compatibility with standard RS-485 and RS-422 interface protocols.

Replacement Considerations

The datasheet identifies the ADM1485 as a superior upgrade for the LTC1485. No other specific substitute part numbers are documented in the provided source material.

FAQ

What is the fail-safe feature of the ADM1485?

The receiver includes a fail-safe feature that guarantees a logic high output state if the inputs are open circuit or floating.

How does the device handle excessive power dissipation?

Thermal shutdown circuitry detects increased die temperature during fault conditions and disables the driver outputs until the temperature cools below the threshold.

What is the common-mode voltage range of the bus?

The ADM1485 supports a bus common-mode range from –7 V to +12 V.