MAX5431AEUB+T

Overview

The MAX5431AEUB+T is a digitally programmable precision resistor array designed for programmable-gain amplifier (PGA) applications. It operates from single +12V to +15V or dual ±12V to ±15V supplies with a typical supply current of 35µA. The device provides four noninverting gain configurations (1, 2, 4, and 8) with a ratio accuracy of 0.025%. It features a CMOS/TTL compatible 2-wire parallel interface and includes an on-chip matching resistor for op amp input bias-current compensation. The component is housed in a 10-pin µMAX package and specified over the -40°C to +85°C temperature range.

Feature Summary

• Four noninverting PGA gain configurations: AV = 1, 2, 4, and 8
• Precision 0.025% divider ratio accuracy
• On-chip matching resistor for op amp bias-current compensation
• CMOS/TTL logic compatible 2-wire parallel interface

Applications

• General-purpose programmable noninverting amplifier
• Programmable instrumentation amplifier

Procurement Notes

Verify the ordering suffix '+T' corresponds to the reel packaging format as indicated in distributor listings. Confirm the 'A' grade ensures the 0.025% ratio accuracy specification. Ensure the µMAX package footprint matches the design requirements before procurement.

Selection Notes

Select the MAX5431 variant specifically when op amp input bias-current compensation is required via the internal matching resistor. Choose this part over the MAX5430 if the application demands precise impedance matching at the inverting input. Verify that the 57kΩ end-to-end resistance between H and L aligns with the target circuit impedance.

Part Context

This component belongs to the MAX5430/MAX5431 family of digitally programmable high-precision resistor arrays. The MAX5431 differs from the MAX5430 by including an integrated matching resistor terminal pair (MATCH_H, MATCH_L) to compensate for op amp offset voltage caused by input bias currents.

Replacement Considerations

The MAX5430AEUB+T serves as a direct functional substitute if the on-chip matching resistor feature is not utilized in the specific circuit design.