ADM2561EBRNZ

Overview

The ADM2561EBRNZ is a 3 kV RMS signal and power isolated RS-485 transceiver manufactured by Analog Devices Inc. It operates with a VCC supply of 3 V to 5.5 V and a logic VIO supply of 1.7 V to 5.5 V. The device supports a maximum data rate of 500 kbps and features an integrated isolated DC-to-DC converter. Key electrical parameters include a propagation delay of 220 ns typical, common-mode transient immunity of 250 kV/µs, and ESD protection of ±15 kV air discharge on the A, B, Y, and Z pins. It is housed in a 28-lead SOIC_W package and functions within a temperature range of −40°C to +105°C.

Feature Summary

• Integrated low radiated emissions isolated DC-to-DC converter eliminates external isolated power supply requirements.
• Cable invert feature allows correction of reversed cable connections while maintaining receiver fail-safe performance.
• Robust IEC61000-4-2 electrostatic discharge protection on RS-485 bus pins ensures system-level EMC compliance.
• High common-mode transient immunity provides reliable operation in electrically noisy industrial environments.

Applications

• Heating, ventilation, and air conditioning (HVAC) networks
• Industrial field buses
• Building automation systems
• Utility networks and energy meters

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required package and tape/reel specifications. Ensure all safety regulatory approvals are current for the target application region before finalizing procurement orders.

Selection Notes

Select this model for applications requiring half-duplex communication at speeds up to 500 kbps. Choose variants from the same family if higher data rates such as 25 Mbps are necessary. Consider the full-duplex ADM2563E variant if independent driver and receiver cable inversion is required for complex bus topologies.

Part Context

This component belongs to the ADM256xE series of isolated RS-485 transceivers. The family includes models with varying data rates and duplex capabilities, such as the high-speed ADM2565E and the full-duplex ADM2563E. All members share the same 28-lead SOIC_W package and isolation architecture.

Replacement Considerations

Direct functional substitutes within the same product line include the ADM2563EBRNZ for full-duplex operation. For higher speed requirements, the ADM2565EBRNZ offers 25 Mbps capability. Verify pin compatibility and insulation ratings when considering cross-family replacements.

FAQ

How does the Cable Invert feature function?

The Cable Invert feature allows the user to correct reversed cable connections on the A, B, Y, and Z bus pins. This is achieved via dedicated control pins that invert the driver output or receiver input signals without losing the receiver fail-safe state.

What is the purpose of the VSEL pin?

The VSEL pin selects the output voltage of the integrated isolated DC-to-DC converter. Connecting VSEL to GNDISO sets the VISO output to 3.3 V, while connecting it to VISO sets the output to 5.0 V, provided VCC is greater than 4.5 V.

Does the device require an external isolated power supply?

No, the ADM2561EBRNZ includes an integrated isolated DC-to-DC converter. This internal converter generates the isolated power required for the RS-485 side, removing the need for an external isolated power source.