AD8571ARM-R2

Overview

The AD8571ARM-R2 is a single-channel, zero-drift operational amplifier from Analog Devices. It features rail-to-rail input and output capabilities and operates on a single supply voltage ranging from 2.7 V to 5 V. Key electrical specifications include a typical offset voltage of 1 μV with a drift of 0.005 μV/°C, an input bias current of 10 pA, and a gain bandwidth product of 1.5 MHz at 5 V. The device delivers a typical open-loop gain of 145 dB and consumes approximately 750 μA per amplifier. It is housed in an 8-lead MSOP package.

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 within the supply voltage limits.
• Features ultralow offset voltage and drift characteristics suitable for high-precision DC measurements.

Applications

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

Procurement Notes

Verify the specific ordering suffix R2 against the manufacturer's official documentation to confirm package type and reel specifications. Ensure compatibility with the required operating temperature range and supply voltage constraints before integration into the design.

Selection Notes

Select this component for applications demanding high DC precision and low noise without the complexity of external compensation. Consider the 8-lead MSOP package for space-constrained designs. Evaluate the trade-off between the low quiescent current and the specific slew rate requirements of the target signal path.

Part Context

This part belongs to the AD857x family of zero-drift amplifiers, which includes dual (AD8572) and quad (AD8574) variants. The family shares similar architectural benefits, such as CMOS construction and random frequency auto-zero stabilization, designed to replace expensive chopper-stabilized amplifiers in cost-sensitive precision applications.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD8571ARZ (SOIC package) or AD8571ARMZ (MSOP tube). Verify that any substitute maintains the required rail-to-rail performance and zero-drift specifications for the specific application environment.

FAQ

Does the AD8571 require external capacitors for stability?

No, the AD8571 does not require external capacitors for operation due to its internal spread-spectrum auto-zero technique.

What is the input common-mode voltage range?

The input common-mode voltage range extends from the negative supply rail to the positive supply rail, supporting full rail-to-rail input capability.