AD8572ARU

Overview

The AD8572ARU is a dual-channel, zero-drift operational amplifier from Analog Devices. It operates on a single supply voltage ranging from 2.7 V to 5 V. Key electrical characteristics include a typical input offset voltage of 1 μV and an input offset drift of 0.005 μV/°C. The device features rail-to-rail input and output capabilities, a gain bandwidth product of 1.5 MHz at 5 V, and a typical open-loop gain of 145 dB. Supply current is approximately 750 μA per amplifier.

Feature Summary

• Utilizes spread-spectrum auto-zero technology to eliminate intermodulation distortion without requiring external capacitors.
• Provides rail-to-rail input and output swing for maximum dynamic range in single-supply applications.
• Features ultralow input bias current and extremely low offset voltage drift over the operating temperature range.

Applications

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

Procurement Notes

Verify the specific package suffix against the datasheet ordering guide, as the RU suffix denotes an 8-lead TSSOP package. Confirm that the required supply voltage range aligns with the 2.7 V to 5 V specification. Ensure thermal management considerations are addressed for the TSSOP package type if operating near maximum temperature limits.

Selection Notes

Select this component when high DC precision and low drift are critical requirements. The dual-channel configuration is suitable for differential signal conditioning or dual sensor interfaces. Consider the 1.5 MHz gain bandwidth product for AC signal integrity. Verify that the single-supply operation fits within the system power constraints.

Part Context

The AD8572ARU belongs to the AD857x family of zero-drift amplifiers, which includes single (AD8571) and quad (AD8574) variants. This family shares identical core architecture and performance specifications, differing primarily in channel count and package options. The AD8572 specifically provides two independent amplifiers in a compact surface-mount footprint.

Replacement Considerations

Direct functional equivalents within the same family include the AD8571ARU (single channel) and AD8574ARU (quad channel). Other packages such as SOIC (R suffix) offer the same electrical performance but require different PCB footprints. Cross-referencing pinouts is essential when substituting package types.

FAQ

Does the AD8572ARU require external capacitors for its auto-zero function?

No, the AD8572ARU does not require external capacitors. The internal spread-spectrum auto-zero technique handles offset correction internally.

What is the input common-mode voltage range?

The input common-mode voltage range extends from the negative supply rail (V–) to the positive supply rail (V+), enabling true rail-to-rail input operation.