REF198ES

Overview

The REF198ES is a precision micropower voltage reference from the Analog Devices REF19x series, providing a nominal output of 4.096 V. It features a maximum temperature coefficient of 5 ppm/°C and an initial accuracy of ±2 mV. The device operates with a supply current of 45 μA maximum and supports up to 30 mA output current. It includes short-circuit protection and low dropout characteristics. Available in an 8-lead SOIC package, it functions within a temperature range of -40°C to +85°C.

Feature Summary

• Utilizes patented temperature drift curvature correction and laser trimming for high stability.
• Features a dedicated sleep mode pin that reduces supply current significantly when disabled.
• Includes built-in short-circuit protection for robust operation under fault conditions.

Applications

• Portable instrumentation
• Analog-to-digital converters (ADCs)
• Digital-to-analog converters (DACs)
• Smart sensors
• Loop-current-powered instruments

Procurement Notes

Verify the specific electrical grade (E, F, or G) required for your application, as performance specifications vary by grade. Confirm the package suffix matches your PCB footprint requirements. Ensure the ordering code corresponds to the correct tube or reel packaging format specified by the distributor. Check for any recent product change notifications regarding manufacturing site updates.

Selection Notes

Select this component when a stable 4.096 V reference is needed with minimal power consumption. Consider the E grade for tighter accuracy and lower noise if budget permits. Verify that the input voltage remains within the specified limits to maintain regulation. Evaluate the thermal environment to ensure the temperature coefficient meets system drift requirements over the operating range.

Part Context

The REF198ES belongs to the REF19x family of precision band gap voltage references. This series is designed for applications requiring low power and high accuracy. The ES suffix indicates an 8-lead SOIC package version. Other variants in the series offer different fixed output voltages such as 2.048 V, 2.5 V, and 5.0 V, sharing similar architectural features.

Replacement Considerations

Direct replacements include other parts from the REF19x series with compatible output voltages and packages. Verify that substitute components meet the same temperature coefficient and accuracy grades. Ensure the replacement part supports the required output current and sleep mode functionality if applicable.

FAQ

What is the function of Pin 1 and Pin 5 on the REF198ES?

Pin 1 and Pin 5 are factory test points reserved for in-package Zener zapping during manufacturing. They should be left unconnected by the user to achieve the highest level of accuracy at the output.

How does the sleep mode operate on the REF198ES?

Sleep mode is enabled by applying a low TTL or CMOS level to the SLEEP pin. In this state, the output is turned off, and the supply current is reduced to less than 15 μA.