REF191GS

Overview

The REF191GS is a precision micropower, low dropout voltage reference from the Analog Devices REF19x series. It provides a nominal output voltage of 2.048 V with an initial accuracy of ±2 mV maximum and a temperature coefficient of 5 ppm/°C maximum. The device operates with a supply current of 45 μA maximum and features a sleep mode reducing consumption to 15 μA. It supports a high output current of 30 mA and includes short-circuit protection. Available in an 8-lead SOIC package, it functions over an extended industrial temperature range of −40°C to +85°C.

Feature Summary

• Utilizes patented temperature drift curvature correction circuitry and laser trimming for high stability.
• Features a dedicated SLEEP pin that reduces supply current when activated by TTL or CMOS logic levels.
• Incorporates internal short-circuit protection mechanisms.
• Provides stable output voltage with minimal dropout relative to the supply input.

Applications

• Portable instrumentation
• Analog-to-digital (ADC) and digital-to-analog (DAC) converters
• Smart sensors
• Solar powered applications
• Loop-current-powered instruments

Procurement Notes

Verify the specific electrical grade suffix (E, F, or G) required for your application's accuracy specifications. Confirm the package type matches the design requirements, as the GS suffix denotes the 8-lead SOIC package. Ensure compatibility with the system's supply voltage range and thermal operating conditions before finalizing procurement.

Selection Notes

Select the REF191GS when a precise 2.048 V reference is needed with low power consumption. Consider the E, F, or G grades based on the required initial accuracy and temperature coefficient limits. Verify that the load current requirements do not exceed the 30 mA capability and ensure the supply voltage remains within the specified dropout limits for optimal regulation.

Part Context

The REF191GS belongs to the REF19x series of precision band gap voltage references manufactured by Analog Devices. This series is designed for applications requiring high accuracy and low power consumption. The component utilizes thin-film resistors and curvature correction to achieve its performance characteristics across various industrial environments.

Replacement Considerations

Consult the official Analog Devices ordering guide for verified substitute part numbers within the REF19x family or other compatible voltage references. Ensure any replacement maintains the same nominal output voltage, package dimensions, and electrical performance specifications.

FAQ

What is the function of Test Pins 1 and 5?

Test Pins 1 and 5 are factory test points reserved for in-package Zener zap trimming. They should remain unconnected during normal operation as their resistance values vary widely between units.

How does the device operate in sleep mode?

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.