ADM1487EARZ

Overview

The ADM1487EARZ is a half-duplex RS-485/RS-422 transceiver operating from a single 5 V power supply. It supports data rates up to 2.5 Mbps with ±15 kV ESD protection on I/O pins. The device features a 1/4 unit load receiver input impedance, allowing up to 128 nodes on the bus. Quiescent current ranges from 230 μA to 500 μA depending on state. It operates within an industrial temperature range of -40°C to +85°C and is housed in an 8-lead SOIC package.

Feature Summary

• Integrated ±15 kV human body model electrostatic discharge protection on differential I/O lines.
• Reduced slew rate driver outputs designed to minimize electromagnetic interference and signal reflections.
• Thermal shutdown circuitry prevents damage during excessive power dissipation caused by bus contention or output shorting.
• Fail-safe receiver design ensures a logic high output state when differential inputs are unconnected.

Applications

• Energy and power metering systems
• Industrial control networks
• Telecommunications equipment
• Security systems
• Instrumentation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging format and compliance status. The REEL7 suffix indicates tape and reel packaging, while the absence of this suffix typically denotes tube packaging. Ensure the component meets RoHS requirements for the intended deployment environment.

Selection Notes

Select the ADM1487EARZ for applications requiring higher node density compared to standard RS-485 devices, as its 1/4 unit load input impedance supports up to 128 transceivers on a single bus. This part is suitable for environments where reduced electromagnetic emissions are critical due to its slew-rate-limited drivers. Verify that the 5 V supply voltage aligns with the system power architecture.

Part Context

This component belongs to the ADM485E/ADM487E/ADM1487E family of ruggedized transceivers manufactured by Analog Devices. While sharing similar pinouts and core functionalities, the ADM1487E is distinguished by its 2.5 Mbps data rate capability and 1/4 unit load receiver impedance, differentiating it from the lower-speed ADM487E and the 1/8 unit load ADM485E.

Replacement Considerations

The MAX1487EESA+ serves as a functional equivalent within the same product family, offering identical electrical specifications and pinout compatibility. Designers should verify that any substitute component maintains the required 1/4 unit load input impedance and 2.5 Mbps data rate performance.