MAX5420CEUA+

Overview

The MAX5420CEUA+ is a digitally programmable precision voltage divider designed for programmable-gain amplifier (PGA) applications. It operates from a single +5V or dual ±5V supply with a typical supply current of 3µA. The device provides four noninverting gain ratios: 1, 2, 4, and 8. It features a 15kΩ end-to-end resistance between the H and L terminals. The C-grade variant guarantees a divider ratio accuracy of ±0.5% over the extended temperature range of -40°C to +85°C. Control is managed via a CMOS/TTL compatible two-bit parallel interface.

Feature Summary

• Four precision noninverting gain ratios: 1, 2, 4, and 8
• ±0.5% divider ratio accuracy guaranteed over -40°C to +85°C
• Low power consumption with 3µA typical supply current
• CMOS/TTL logic compatible 2-Wire parallel interface

Applications

• General-purpose programmable noninverting amplifiers
• Programmable instrumentation amplifiers

Procurement Notes

Verify the component grade suffix 'C' corresponds to the required ±0.5% accuracy specification. Confirm the package type matches the design requirements, as this part utilizes an 8-pin µMAX footprint. Ensure the system design accommodates the specified operating temperature range of -40°C to +85°C.

Selection Notes

Select the MAX5420CEUA+ when a ±0.5% resistor ratio accuracy is sufficient for the application. This model lacks the on-chip matching resistor found in the MAX5421 series; therefore, use it with op amps featuring ultra-low input bias currents or implement external compensation if necessary. Verify that the 15kΩ total resistance aligns with the impedance requirements of the target circuit.

Part Context

This component belongs to the MAX5420/MAX5421 family of digitally programmable precision voltage dividers. The MAX5420 variant does not include the internal matching resistor present in the MAX5421. The 'C' designation indicates the specific accuracy class within the product line, distinguishing it from higher-precision A and B grades.

Replacement Considerations

The MAX5420BEUA+ offers improved accuracy at ±0.09%. The MAX5420AEUA+ provides the highest accuracy at ±0.025%. For designs requiring bias-current compensation, the MAX5421CEUB+ serves as a functional equivalent with an integrated matching resistor.