REF194GS-REEL7

Overview

The REF194GS-REEL7 is a precision micropower low dropout voltage reference from the Analog Devices REF19x series, housed in an 8-lead SOIC package. 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 maximum temperature coefficient of 5 ppm/°C and a supply current of 45 μA maximum. It includes a sleep mode that reduces supply current to 15 μa maximum when enabled via the SLEEP pin.

Feature Summary

• Utilizes patented temperature drift curvature correction circuitry and laser-trimmed thin-film resistors for high stability.
• Operates as a micropower device with low dropout voltage capability, requiring minimal headroom above the output voltage.
• Includes a dedicated sleep mode pin to significantly reduce power consumption during inactive periods.

Applications

• Portable instruments
• ADCs and DACs
• Smart sensors
• Solar powered applications
• Loop-current-powered instruments

Procurement Notes

Verify the specific electrical grade (E 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, as the GS suffix indicates the SOIC package. Ensure the REEL7 designation aligns with your automated assembly requirements. Check the latest datasheet revision for any updates to absolute maximum ratings or thermal resistance values before finalizing the design.

Selection Notes

Select this component when a stable 4.5 V reference is needed with strict micropower constraints. The E grade offers superior line and load regulation compared to the G grade. Consider the extended industrial temperature range if operating conditions exceed standard commercial limits. Evaluate the need for the sleep function to optimize battery life in portable designs.

Part Context

This part belongs to the REF19x series of precision band gap voltage references. The series includes various nominal output voltages ranging from 2.048 V to 5.00 V. All devices in the series share similar architectural features, including low dropout operation and micropower consumption, but differ in their specific output voltage and available electrical grades.

FAQ

What is the purpose of Test Pins 1 and 5 on the REF194?

Test Pins 1 and 5 are reserved for in-package Zener zap trimming used by the manufacturer to achieve high accuracy. Users should leave these pins unconnected.

How does the solder heat effect impact the REF194's accuracy?

The initial accuracy specification does not include the shift due to the solder heat effect. Designers must account for potential voltage shifts after reflow soldering processes.