REF198GS

Overview

The REF198GS is a precision micropower voltage reference from the Analog Devices REF19x series, housed in an 8-lead SOIC package. It provides a nominal output voltage of 4.096 V with an initial accuracy of ±2 mV maximum. The device features a low dropout voltage design and consumes a maximum supply current of 45 μA. It includes a sleep mode that reduces supply current to less than 15 μA when enabled via the SLEEP pin. The unit 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 to disable the output and minimize power consumption.
• Includes internal short-circuit protection for enhanced reliability.
• Provides high output current capability suitable for driving ADCs and DACs.

Applications

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

Procurement Notes

Verify the specific suffix 'GS' corresponds to the 8-lead SOIC package variant. Confirm the electrical grade requirements against the datasheet specifications for line and load regulation. Ensure the application environment remains within the specified operating temperature range of −40°C to +85°C for guaranteed performance parameters.

Selection Notes

Select this component for designs requiring a stable 4.096 V reference with low quiescent current. Consider the low dropout characteristic for battery-powered systems where supply voltage may approach the output level. Evaluate the need for the sleep function if power conservation during idle states is critical for the system architecture.

Part Context

This part belongs to the REF19x series of precision band gap voltage references. The series offers various fixed output voltages including 2.048 V, 2.5 V, 3.0 V, 3.3 V, 4.5 V, and 5.0 V. All variants share similar architectural features such as micropower operation and low dropout capabilities, differing primarily in their nominal output voltage and available packaging options.

Replacement Considerations

Other members of the REF19x family, such as REF195 or REF192, serve as functional substitutes if different nominal output voltages are acceptable. Verify that any replacement maintains compatibility with the required output voltage and package type for the existing PCB layout.

FAQ

What is the purpose of Test Pins 1 and 5?

Test Pins 1 and 5 are factory test points reserved for in-package Zener zap trimming. They should be left unconnected by the user to achieve the highest level of accuracy at the output.

How is the sleep mode activated?

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.