REF194GSZ

Overview

The REF194GSZ is a precision micropower low dropout voltage reference from the Analog Devices REF19x series, featuring a nominal output voltage of 4.50 V. It utilizes a patented temperature drift curvature correction circuit and laser-trimmed thin-film resistors to achieve high initial accuracy and a maximum temperature coefficient of 5 ppm/°C. The device provides a high output current of 30 mA with a low supply current of 45 μA maximum. It includes short-circuit protection and operates within an extended industrial temperature range of −40°C to +85°C.

Feature Summary

• Patented temperature drift curvature correction circuit for high stability
• Laser trimming of highly stable thin-film resistors ensures high initial accuracy
• Micropower operation with low dropout voltage capability
• Integrated sleep mode functionality for reduced power consumption

Applications

• Portable instrumentation
• Analog-to-digital converters (ADCs)
• Digital-to-analog converters (DACs)
• Smart sensors
• 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 that the 8-lead SOIC package matches your PCB footprint. Ensure the input supply voltage remains within the specified limits relative to the output voltage to maintain proper dropout performance.

Selection Notes

Select the REF194GSZ when a precise 4.50 V reference is needed in space-constrained designs requiring surface-mount packaging. Consider the E grade for tighter regulation specifications if higher precision is critical. Evaluate the sleep pin requirement; if power saving is not needed, this pin can be left unconnected or configured according to the datasheet guidelines.

Part Context

The REF194GSZ belongs to the REF19x series of precision voltage references manufactured by Analog Devices Inc. This series encompasses various nominal output voltages, including 2.048 V, 2.50 V, 3.00 V, 4.50 V, 5.00 V, 3.30 V, and 4.096 V. All devices in the series share common architectural features like low dropout design and micropower consumption, differing primarily in their calibrated output voltage levels.

Replacement Considerations

Other members of the REF19x series, such as REF191, REF192, REF193, REF195, REF196, and REF198, offer different nominal output voltages but share similar package options and functional characteristics. When substituting, ensure the new part's output voltage meets the circuit requirements and verify that the electrical grade specifications are compatible.