MAX5420BEUA+

Overview

The MAX5420BEUA+ is a digitally programmable precision voltage divider optimized for programmable gain amplifier (PGA) configurations. 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 BEUA variant guarantees a resistor ratio accuracy of 0.09% over the extended temperature range of -40°C to +85°C. Control is managed via a CMOS/TTL compatible 2-wire parallel interface using D1 and D0 inputs.

Feature Summary

• Four precision divider ratios providing noninverting gains of 1, 2, 4, and 8
• 0.09% 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 digital interface

Applications

• General-purpose programmable noninverting amplifiers
• Programmable instrumentation amplifiers

Procurement Notes

Verify the component against the official Analog Devices datasheet to confirm the specific 'B' grade accuracy of 0.09%. Ensure the design supports the required 15kΩ impedance profile at the W terminal for the selected gain setting. Confirm that the system environment remains within the specified -40°C to +85°C operating temperature range.

Selection Notes

Select this part when a fixed 15kΩ total resistance is required for the divider network. The BEUA grade offers a balance of precision and cost compared to the AEUA (0.025%) and CEUA (0.5%) variants. Note that unlike the MAX5421, this device lacks an on-chip matching resistor for op amp bias-current compensation; external compensation or low-bias op amps are necessary.

Part Context

This component belongs to the MAX5420/MAX5421 family of digitally programmable voltage dividers. The MAX5420 series focuses on core division functionality, whereas the MAX5421 adds a matching resistor pin. Both share identical electrical characteristics regarding gain steps and interface protocols but differ in pin count and package options.

Replacement Considerations

The MAX5420AEUA+ and MAX5420CEUA+ are direct functional substitutes within the same package, differing only in ratio accuracy specifications. For designs requiring bias-current compensation, the MAX5421BEUB serves as a compatible alternative with additional pins.