REF191GS-REEL

Overview

The REF191GS-REEL 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 consumes a maximum supply current of 45 μA and features a sleep mode reducing consumption to 15 μA. It supports a high output current of 30 mA and includes short-circuit protection. Packaged in an 8-lead SOIC, it operates 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 disables the output and reduces supply current when activated by TTL or CMOS levels.
• Includes integrated short-circuit protection to safeguard the device during fault conditions.

Applications

• Portable instruments
• Analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
• Smart sensors
• Solar powered applications
• Loop-current-powered instruments

Procurement Notes

Verify the specific electrical grade (E, F, or G) required for your application, as specifications such as line regulation and load regulation vary between grades. Confirm the package suffix matches the desired form factor; GS indicates an 8-lead SOIC. Ensure the REEL designation aligns with automated assembly requirements. Check for any recent product change notices regarding manufacturing sites or materials.

Selection Notes

Select this component when a stable 2.048 V reference is needed with minimal power consumption. Consider the E grade for tighter performance limits on line and load regulation compared to F or G grades. Verify that the input supply voltage remains within the specified dropout range relative to the 2.048 V output. Ensure the load current does not exceed the 30 mA limit to maintain regulation and thermal safety.

Part Context

The REF191GS-REEL belongs to the REF19x series of precision band gap voltage references. This family offers various fixed output voltages including 2.5 V, 3.0 V, 4.5 V, 5.0 V, 3.3 V, and 4.096 V. All members share similar micropower characteristics, low dropout capabilities, and sleep mode functionality, differing primarily in their nominal output voltage and specific electrical grade availability.

Replacement Considerations

Direct substitutes within the same series include other REF19x variants with different output voltages if the system architecture allows. For identical 2.048 V output, verify compatibility with alternative packages like TSSOP (RU suffix) or PDIP (P suffix), noting that lower grades may be restricted to these packages. Cross-reference with other micropower low-dropout references if pin-out or voltage differs.

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 by the user as their resistance values vary widely between parts.

How is the sleep mode activated?

Sleep mode is enabled by applying a low logic level (TTL or CMOS compatible) to the SLEEP pin. In this state, the output is turned off and supply current drops below 15 μA.