AD8574ARUZ

Overview

The AD8574ARUZ is a quad zero-drift operational amplifier from Analog Devices, featuring rail-to-rail input and output capabilities. It operates on a single supply voltage ranging from 2.7 V to 5 V. Key electrical characteristics include a typical offset voltage of 1 μV with a drift of 0.005 μV/°C, an ultralow input bias current of 10 pA, and a gain bandwidth product of 1.5 MHz at 5 V. The device provides high open-loop gain (145 dB typical) and common-mode rejection ratio (140 dB typical). Supply current per amplifier is typically 750 μA at 2.7 V and 850 μA at 5 V. It is specified for operation over an extended temperature range of −40°C to +125°C.

Feature Summary

• Utilizes spread-spectrum auto-zero technology to eliminate intermodulation distortion effects in AC applications without requiring external capacitors.
• Features rail-to-rail input and output swings, allowing full signal utilization across the entire supply voltage range.
• Provides exceptional DC precision with ultralow offset voltage and drift, ensuring minimal error sources over wide temperature variations.
• Includes internal overload recovery mechanisms and short-circuit protection for robust performance under fault conditions.

Applications

• Temperature sensors
• Pressure sensors
• Precision current sensing
• Strain gage amplifiers
• Medical instrumentation

Procurement Notes

Verify the specific package suffix against the ordering guide to ensure compatibility with the required footprint. Confirm that the supply voltage requirements align with the 2.7 V to 5 V operating range. Check thermal resistance values if high power dissipation is expected in dense layouts. Ensure ESD precautions are followed during handling due to the CMOS input structure.

Selection Notes

Select this component when high DC accuracy and low drift are critical, particularly in single-supply systems. The quad configuration makes it suitable for multi-channel sensor interfaces. Consider the 1.5 MHz gain bandwidth for moderate speed requirements. Evaluate the 750 μA per amplifier supply current for battery-powered applications where efficiency is important.

Part Context

The AD8574ARUZ belongs to the AD857x family of zero-drift amplifiers, which includes single (AD8571), dual (AD8572), and quad (AD8574) variants. All members share identical electrical characteristics and architectural features, differing only in channel count and pinout configurations. This family is designed to replace expensive chopper-stabilized amplifiers while maintaining high precision.

Replacement Considerations

Direct functional substitutes within the same family include the AD8571ARUZ (single channel) and AD8572ARUZ (dual channel). Verify pin compatibility when substituting between different channel counts in the same package type.

FAQ

Does the AD8574 require external capacitors for stabilization?

No, the AD8574 does not require external capacitors for its auto-zero function or stability.

What is the maximum supply voltage for the AD8574?

The absolute maximum supply voltage rating is 6 V, but the recommended operating range is 2.7 V to 5 V.