AD8574ARZ

Overview

The AD8574ARZ is a zero-drift, single-supply, rail-to-rail input/output quad operational amplifier manufactured by Analog Devices. It operates from a 2.7 V to 5 V supply and features an ultralow offset voltage of 1 μV with a drift of 0.005 μV/°C. The device provides a typical gain of 145 dB, CMRR of 140 dB, and PSRR of 130 dB. It draws 750 μA per amplifier and offers a 1.5 MHz gain-bandwidth product with a 0.4 V/μs slew rate. The output can source or sink up to 30 mA.

Feature Summary

• Utilizes spread-spectrum auto-zero technology to eliminate intermodulation distortion caused by chopping functions interacting with signal frequencies.
• Features rail-to-rail input and output swings, allowing operation across the full supply voltage range without external capacitors.
• Provides ultralow input bias current and offset voltage drift, ensuring high precision over the extended industrial temperature range.

Applications

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

Procurement Notes

Verify the specific package suffix matches the required footprint, as the 'R' suffix denotes SOIC packaging. Confirm that the application environment stays within the specified 2.7 V to 5 V single-supply limits. Ensure thermal management accounts for the junction temperature ratings when operating at maximum load conditions.

Selection Notes

Select this component for designs requiring high DC accuracy combined with low AC distortion. The quad configuration reduces board space compared to using multiple single-channel units. Consider the 14-lead SOIC package dimensions for layout planning. Verify that the 30 mA output current capability meets the drive requirements of the downstream circuitry.

Part Context

The AD8574ARZ belongs to the AD857x family, which includes single (AD8571) and dual (AD8572) variants. All members share the same zero-drift architecture and electrical characteristics but differ in channel count and package options. This family is designed to replace expensive auto-zeroing amplifiers while maintaining high accuracy.

Replacement Considerations

Direct functional substitutes within the same package include the AD8571ARZ (single channel) and AD8572ARZ (dual channel). Cross-package replacements require verifying pin compatibility and thermal resistance differences between SOIC and TSSOP variants.