REF194GS

Overview

The REF194GS is a precision micropower low dropout voltage reference from the Analog Devices REF19x series. It provides a nominal output voltage of 4.50 V with an initial accuracy of ±2 mV maximum at 25°C. The device features a temperature coefficient of 5 ppm/°C maximum and operates over an extended industrial temperature range of −40°C to +85°C. It delivers a high output current of 30 mA while consuming a maximum supply current of 45 μA, which reduces to 15 μA in sleep mode. Electrical specifications include line regulation of 4 ppm/V and load regulation of 4 ppm/mA. The component is housed in an 8-lead SOIC package.

Feature Summary

• Utilizes patented temperature drift curvature correction circuitry and laser-trimmed thin-film resistors for high stability.
• Features a dedicated sleep mode pin that disables the output and significantly reduces supply current consumption.
• Incorporates internal 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 suffix (e.g., GS) against the manufacturer's ordering guide to ensure compliance with required accuracy and temperature coefficient specifications. Confirm package availability and lead times through authorized distributors. Ensure proper handling procedures are followed due to electrostatic sensitivity. Cross-reference datasheet revisions to confirm parameter consistency before finalizing procurement.

Selection Notes

Select this component when a stable 4.50 V reference is required with minimal power consumption. Consider the low dropout characteristic for battery-operated systems where supply voltage may approach the output level. Evaluate the sleep mode functionality if power management is critical. Verify that the 30 mA output current meets the load requirements of the downstream circuitry.

Part Context

The REF194GS belongs to the REF19x series of precision band gap voltage references manufactured by Analog Devices Inc. This series includes various nominal output voltages such as 2.048 V, 2.50 V, 3.00 V, 5.00 V, and others. All devices in the series share common architectural features including micropower operation, low dropout capability, and high initial accuracy achieved through laser trimming.

Replacement Considerations

Direct replacements within the same family include other REF19x variants with different output voltages or grades. For equivalent performance, verify compatibility regarding package type, operating temperature range, and electrical specifications such as line and load regulation.

FAQ

What is the function of Test Pins 1 and 5 on the REF194GS?

Test Pins 1 and 5 are reserved for in-package Zener zap trimming used to achieve high accuracy. They should be left unconnected by the user.

How does the REF194GS enter sleep mode?

Sleep mode is enabled by applying a low TTL or CMOS level to the SLEEP pin, which turns off the output and reduces supply current to less than 15 μA.