MAX22026AWA+T

Drivers, Receivers, Transceivers Overview

The MAX22026AWA+T 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 the cable side. The device supports data rates up to 16Mbps with non-slew-rate-limited drivers. It operates on a VDDA supply range of 1.71V to 5.5V and a VDDB supply range of 4.75V to 5.25V. The receiver input threshold is ±200mV, and it offers ±10kV ESD protection on driver outputs and receiver inputs per the Human Body Model.

Drivers, Receivers, Transceivers Feature Summary

• Integrated AutoDirection circuitry eliminates the need for separate DE and RE control signals by using an internal state machine to manage driver and receiver states based on TXD input and bus voltage.
• High-voltage capacitive isolation barrier breaks ground loops and withstands large potential differences between ports, ensuring robust communication in noisy environments.
• Driver outputs are not slew-rate limited, enabling high-speed transmission up to 16Mbps while maintaining signal integrity across the isolation barrier.

Drivers, Receivers, Transceivers Applications

• Utility Meters
• Industrial Automation Equipment
• Programmable Logic Controllers

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and RoHS compliance status. Ensure that the component matches the required thermal resistance characteristics for the intended PCB layout. Cross-reference the datasheet revision history to confirm the availability of the latest electrical specifications before finalizing procurement orders.

Drivers, Receivers, Transceivers Selection Notes

Select this model when high-speed data transmission up to 16Mbps is required alongside galvanic isolation. The non-slew-rate-limited driver distinguishes it from the MAX22025/MAX22027 variants which are limited to 0.5Mbps. Verify that the system design accommodates the specific VDDA and VDDB power supply requirements defined in the DC electrical characteristics table.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX22025-MAX22028 family of compact isolated transceivers. The '26' designation specifically indicates the variant with non-slew-rate-limited drivers capable of 16Mbps operation. The 'WA' suffix denotes the 8-pin wide body SOIC package, and the '+' indicates lead-free/RoHS compliant manufacturing.

Drivers, Receivers, Transceivers Replacement Considerations

MAX22028AWA+T

Drivers, Receivers, Transceivers FAQ

How does the AutoDirection feature function?

AutoDirection uses an internal state machine that monitors the TXD input and the differential bus voltage (VA-VB) to automatically enable or disable the driver and receiver, removing the need for external control signals.

What is the isolation voltage rating?

The device provides 3.5kVRMS of isolation voltage for 60 seconds and withstands a maximum working isolation voltage of 445VRMS continuously.

Does the receiver output follow the bus during transmission?

No, for the MAX22026, the receiver output does not follow (VA-VB) when the device is in the driver-enabled state, allowing for line interference detection.