MAX5421CEUB+

Overview

The MAX5421CEUB+ is a digitally programmable precision voltage divider in a 10-pin µMAX package. It provides four noninverting gain ratios (1, 2, 4, and 8) for programmable gain amplifier applications. The device operates from a single +5V or dual ±5V supply with a typical supply current of 3µA. It features a 0.5% resistor ratio accuracy over the -40°C to +85°C temperature range. A key differentiator is the on-chip matching resistor for op amp bias-current compensation. The H-to-L resistance is 15kΩ, and it utilizes a CMOS/TTL compatible 2-wire parallel interface.

Feature Summary

• Four precision divider ratios (1, 2, 4, 8) for PGA configurations
• On-chip matching resistor for op amp bias-current compensation
• 0.5% ratio accuracy guaranteed over -40°C to +85°C
• Low 3µA supply current with single +5V or dual ±5V operation

Applications

• General-purpose programmable noninverting amplifiers
• Programmable instrumentation amplifiers

Procurement Notes

Verify the component matches the specific 0.5% accuracy grade (suffix 'C') and 10-pin µMAX package (suffix 'UB'). Confirm the datasheet revision and manufacturer documentation align with the requested part number before integration into designs.

Selection Notes

Select this model when bias-current compensation is required within the voltage divider network. Choose the 'C' suffix variant if 0.5% accuracy meets system requirements, as higher precision grades (A/B) are available in the same family. Ensure the 15kΩ end-to-end resistance fits the impedance constraints of the target amplifier stage.

Part Context

This component belongs to the MAX5420/MAX5421 family of digitally programmable voltage dividers. The MAX5421 variant specifically includes an internal matching resistor absent in the MAX5420. The CEUB designation identifies the 0.5% accuracy grade housed in a 10-lead µMAX package.

Replacement Considerations

The MAX5420CEUB+ serves as a functional substitute if external bias-current compensation is handled by the operational amplifier selection rather than the divider itself. Verify pin compatibility and accuracy specifications when substituting.