MAX22025AWA+

Drivers, Receivers, Transceivers Overview

The MAX22025AWA+ is a compact, isolated half-duplex RS-485/RS-422 transceiver featuring proprietary AutoDirection control. It provides 3.5kVRMS of digital galvanic isolation between the UART side and cable side. The device supports data rates up to 0.5Mbps with slew-rate limited drivers to minimize EMI. Logic-side supply voltage (VDDA) ranges from 1.71V to 5.5V, while cable-side supply (VDDB) operates at 4.75V to 5.25V. Driver outputs and receiver inputs withstand ±10kV electrostatic discharge (HBM). It is housed in an 8-pin wide body SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• AutoDirection control eliminates the need for separate driver-enable and receiver-enable signals by using an internal state machine.
• Slew-rate limited drivers reduce electromagnetic interference and reflections caused by improper cable termination.
• Integrated protection includes ±10kV HBM ESD on A/B pins and failsafe receiver functionality to prevent fault transitions during input shorts or opens.

Drivers, Receivers, Transceivers Applications

• Utility meters
• Industrial automation equipment
• Programmable logic controllers
• HVAC systems

Drivers, Receivers, Transceivers Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct manufacturer channels. Confirm RoHS compliance status and check for specific ordering suffixes that may indicate packaging variations. Ensure the procurement source provides valid traceability documentation to guarantee product integrity and adherence to safety regulatory approvals.

Drivers, Receivers, Transceivers Selection Notes

Select this model when designing isolated RS-485 ports requiring simplified control logic via AutoDirection. It is suitable for applications needing reduced EMI through slew-rate limiting. Verify that the system ground potential differences do not exceed the 3.5kVRMS isolation rating. Ensure external pullup/pulldown resistors are sized correctly to maintain bus idle states compatible with the receiver threshold.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX22025-MAX22028 family of compact isolated transceivers. It shares the same functional architecture as other variants in the series but is distinguished by its specific maximum data rate capability of 0.5Mbps due to slew-rate limiting. It utilizes the same 8-pin wide body SOIC package code W8MS+.

Drivers, Receivers, Transceivers Replacement Considerations

The MAX22025F is a failsafe variant within the same family offering identical isolation and interface characteristics. Other models such as the MAX22026, MAX22027, and MAX22028 provide higher data rates up to 16Mbps but lack the slew-rate limiting feature found in the MAX22025.

Drivers, Receivers, Transceivers FAQ

How does the AutoDirection circuitry function?

The AutoDirection circuitry uses an internal state machine and a differential comparator to automatically enable or disable the driver and receiver based on the TXD input and the current state of the bus (VA-VB), removing the need for external control signals.

What is the purpose of the slew-rate limited drivers?

The slew-rate limited drivers minimize electromagnetic interference (EMI) and reduce signal reflections caused by improper cable termination, ensuring error-free transmission up to 0.5Mbps.

Does the MAX22025AWA+ include a failsafe receiver?

No, the standard MAX22025 does not include a failsafe receiver. The failsafe feature, which guarantees a logic high output during input shorts or opens, is available only in the MAX22025F variant.