ADM1491EBRMZ

Overview

The ADM1491EBRMZ is a full-duplex RS-485/RS-422 transceiver designed for high-speed communication in multipoint transmission lines. It operates from a single 5 V power supply and supports data rates up to 16 Mbps. The device features ±8 kV ESD protection on the A, B, Y, and Z pins using the human body model. It includes thermal shutdown protection that activates when die temperature exceeds 150°C, and short-circuit protection limits output current to ±250 mA during faults. The receiver incorporates an open circuit fail-safe feature, ensuring a logic high output if inputs are unconnected. It complies with ANSI/TIA/EIA-485-A-1998 standards and allows up to 32 nodes on the bus.

Feature Summary

• Full-duplex operation supporting simultaneous transmission and reception on balanced transmission lines.
• Integrated electrostatic discharge protection providing robust immunity against transient events.
• Built-in thermal shutdown circuitry prevents damage by forcing outputs to a high impedance state under excessive heat conditions.
• Fail-safe receiver design ensures a defined logic high output state when differential inputs are floating or disconnected.

Applications

• High speed motor control applications requiring fast communication protocols.
• Industrial field networks utilizing multipoint data transmission systems.
• Single-ended-to-differential signal conversion interfaces.
• RS-485/RS-422 compliant communication buses.

Procurement Notes

Verify the specific package variant, as the ADM1491E series is available in both 14-lead SOIC and 10-lead MSOP configurations. Confirm RoHS compliance status through official manufacturer documentation, as ordering suffixes may indicate packaging or environmental attributes. Ensure the selected component matches the required pinout for the target PCB layout.

Selection Notes

Select this component for applications requiring full-duplex communication at speeds up to 16 Mbps. It is suitable for environments where ESD protection is critical. Verify that the system operates within the specified 5 V supply range and that the thermal management strategy accommodates the junction temperature limits. Ensure the bus topology supports the unit load requirements for up to 32 nodes.

Part Context

The ADM1491EBRMZ belongs to the ADM1490E/ADM1491E family of transceivers manufactured by Analog Devices. This family is engineered for high-speed, full-duplex communication on multipoint transmission lines. The ADM1491E specifically provides separate driver and receiver enable controls, distinguishing it from half-duplex variants. It is designed to comply with TIA/EIA-485-A-98 standards for balanced transmission lines.

Replacement Considerations

The ADM1491EBRZ serves as a direct replacement offering the same electrical specifications but housed in a 14-lead narrow-body SOIC package instead of the MSOP form factor. Both components share identical functionality, pinouts, and performance characteristics within the industrial temperature range.