REF198ESZ-REEL7

Overview

The REF198ESZ-REEL7 is a micropower, low dropout voltage reference from the Analog Devices REF19x series. It provides a nominal output voltage of 4.096 V with an initial accuracy of ±2 mV maximum. The device features a temperature coefficient of 5 ppm/°C maximum and supports a high output current of 30 mA while consuming only 45 μA of supply current. It includes a sleep mode that reduces supply current to 15 μA maximum. The component 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 precision.
• Features a dedicated sleep pin to disable the output and minimize power consumption.
• Incorporates short-circuit protection for enhanced operational safety.
• Designed as a low dropout voltage (LDV) device requiring minimal headroom.

Applications

• Portable instruments
• ADCs and 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 by grade. Confirm the package suffix matches the desired form factor; the ESZ designation indicates an 8-lead SOIC package in a reel configuration. Ensure compatibility with the system's input voltage range, which must remain within the specified limits for proper operation.

Selection Notes

Select this component when a stable 4.096 V reference is needed with low quiescent current. Consider the REF19x series if the design requires a sleep function to extend battery life in portable devices. Evaluate the thermal performance and dropout voltage requirements against the available supply rail. Verify that the 30 mA output current capability meets the load demands without exceeding power dissipation limits.

Part Context

This part belongs to the REF19x Series, a family of precision band gap voltage references manufactured by Analog Devices Inc. The series is characterized by its use of thin-film resistors and advanced trimming techniques to achieve low temperature coefficients. The REF198 variant specifically targets applications requiring a 4.096 V output level within this micropower architecture.

Replacement Considerations

Direct replacements within the same family include other REF19x variants with different fixed output voltages, such as REF192 or REF195, provided the voltage requirement differs. Cross-referencing should focus on matching the output voltage, package type, and electrical grades to ensure functional equivalence in existing designs.

FAQ

What is the purpose of Test Pins 1 and 5?

Test Pins 1 and 5 are reserved for factory in-package Zener zap trimming. They are not intended for user connection and should be left unconnected to maintain accuracy.

How does the sleep mode function?

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