MAX5420CEUA+T

Overview

The MAX5420CEUA+T is a digitally programmable precision voltage divider optimized for programmable gain amplifier (PGA) configurations. It provides four noninverting gain ratios of 1, 2, 4, and 8 via a two-bit parallel interface. The device features a 15 kΩ end-to-end resistance with a ratio accuracy of ±0.5%. It operates from a single +5V or dual ±5V supply with a typical supply current of 3µA. The component is housed in an 8-pin µMAX package and is specified for operation over the -40°C to +85°C temperature range.

Feature Summary

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

Applications

• General-purpose programmable noninverting amplifiers
• Programmable instrumentation amplifiers

Procurement Notes

Verify that the ordering suffix '+T' corresponds to tape-and-reel packaging as indicated by distributor listings. Confirm the 'C' grade designation matches the required ±0.5% ratio accuracy specification. Ensure the 8-pin µMAX package form factor aligns with the target PCB footprint requirements.

Selection Notes

Select this part when a ±0.5% resistor ratio accuracy is sufficient for the application. The MAX5420 lacks the on-chip matching resistor found in the MAX5421; therefore, use an ultra-low input bias current op amp if offset compensation is needed. Verify that the 15 kΩ H-to-L resistance meets the impedance requirements of the connected circuitry.

Part Context

This component belongs to the MAX5420/MAX5421 family of digitally programmable precision voltage dividers. The MAX5420 variant differs from the MAX5421 by excluding the on-chip matching resistor used for op amp bias-current compensation. The 'C' suffix denotes the ±0.5% accuracy grade, while 'A' and 'B' grades offer higher precision at 0.025% and 0.09%, respectively.

Replacement Considerations

The MAX5420BEUA+T offers improved accuracy at 0.09% with identical pinout and functionality. For applications requiring bias-current compensation, the MAX5421CEUB+T provides the same accuracy but includes a matching resistor in a 10-pin package.