MAX22028FAWA+T

Drivers, Receivers, Transceivers Overview

The MAX22028FAWA+T is a compact, isolated half-duplex RS-485/RS-422 transceiver featuring 3.5kVRMS digital galvanic isolation between the UART and cable sides. It supports data rates up to 16Mbps with non-slew-rate-limited drivers. The device utilizes AutoDirection control to eliminate separate driver-enable signals. Electrical specifications include a VDDA range of 1.71V to 5.5V and VDDB range of 4.75V to 5.25V. Common-mode transient immunity is rated at 50kV/μs. ESD protection on A/B pins reaches ±10kV (HBM). It operates from -40°C to +85°C in an 8-pin wide SOIC package.

Drivers, Receivers, Transceivers Feature Summary

• Integrated AutoDirection circuitry automatically manages driver and receiver states based on TXD input and bus voltage.
• Provides robust communication via high-voltage capacitive isolation breaking ground loops.
• Includes failsafe receiver functionality ensuring logic-high output during open or shorted input conditions.
• Features enhanced electrostatic discharge protection on differential I/O pins.

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. Confirm RoHS compliance status using the specific ordering suffix. Ensure proper handling procedures are followed due to the sensitivity of the isolation barrier components. Cross-reference datasheet revisions to ensure compatibility with current design requirements.

Drivers, Receivers, Transceivers Selection Notes

Select this model for applications requiring high-speed transmission up to 16Mbps where slew-rate limiting is unnecessary. Choose this variant over the F-series if failsafe receiver operation is not required. Verify that the system power supply meets the distinct voltage requirements for the logic side versus the cable side domains.

Drivers, Receivers, Transceivers Part Context

This component belongs to the MAX22025-MAX22028F family of isolated transceivers. It shares the same pinout and core architecture as other members but differs in driver speed characteristics. The 'F' suffix indicates the inclusion of failsafe receiver capabilities within the package.

Drivers, Receivers, Transceivers Replacement Considerations

MAX22028AWA+T serves as a direct functional substitute lacking failsafe features. MAX22027F provides similar isolation but with reduced maximum data rates. Verify pin compatibility and thermal performance when substituting across different series variants.

Drivers, Receivers, Transceivers FAQ

How does the AutoDirection feature function?

AutoDirection uses an internal state machine to enable the driver only when necessary, disabling it once the bus voltage exceeds a threshold, thereby eliminating the need for external DE/RE control signals.

What is the difference between MAX22028 and MAX22028F?

The MAX22028F includes a failsafe receiver that guarantees a logic-high output if inputs are open or shorted, whereas the standard MAX22028 does not guarantee this behavior.

Can the device operate with asymmetric power supplies?

Yes, the device requires independent power supplies: VDDA (1.71V to 5.5V) for the logic side and VDDB (4.75V to 5.25V) for the cable side.