AD8572ARUZ

Overview

The AD8572ARUZ is a dual zero-drift operational amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5 V and features rail-to-rail input and output capabilities. The device utilizes a spread-spectrum auto-zero technique to eliminate intermodulation distortion, ensuring high precision without external capacitors. Key electrical characteristics include a typical offset voltage of 1 μV, an input offset drift of 0.005 μV/°C, and a gain bandwidth product of 1.5 MHz at 5 V. It offers a typical open-loop gain of 145 dB, a common-mode rejection ratio of 140 dB, and a power supply rejection ratio of 130 dB. The supply current is approximately 750 μA per amplifier.

Feature Summary

• Zero-drift architecture using spread-spectrum auto-zero stabilization to maintain low offset voltage and minimize temperature drift.
• Rail-to-rail input and output swing capability allowing operation across the full supply voltage range.
• Ultralow input bias current and offset voltage suitable for high-precision signal conditioning applications.
• No external capacitors required for proper operation due to integrated internal compensation.

Applications

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

Procurement Notes

Verify the specific package suffix RU corresponds to the 8-lead TSSOP configuration required for your design. Confirm that the operating environment stays within the specified -40°C to +125°C temperature range. Ensure supply voltages do not exceed the absolute maximum ratings of 6 V. Check for RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component when high DC precision and low drift are critical in single-supply systems. The dual channel configuration is ideal for differential sensing or instrumentation amplifier front ends. Consider the 1.5 MHz gain bandwidth for moderate speed applications requiring minimal phase shift. Evaluate the 750 μA supply current against system power constraints.

Part Context

The AD8572ARUZ belongs to the AD857x family of zero-drift amplifiers, which includes the single-channel AD8571 and quad-channel AD8574 variants. This family shares the same core CMOS auto-zero topology and electrical performance characteristics. The 'RU' suffix specifically denotes the 8-lead Thin Shrink Small Outline Package (TSSOP) with a 0.173-inch width.

Replacement Considerations

Direct pin-compatible substitutes within the same family include the AD8571ARUZ (single channel) and AD8574ARUZ (quad channel). Verify that any alternative replacement maintains the same 8-lead TSSOP footprint and meets the 2.7 V to 5 V single-supply requirement.

FAQ

Does the AD8572ARUZ require external capacitors for stability?

No, the AD8572ARUZ does not require external capacitors for proper operation as it utilizes an integrated spread-spectrum auto-zero technique.

What is the input offset voltage drift specification?

The input offset voltage drift is typically 0.005 μV/°C over the operating temperature range of -40°C to +125°C.

Can the AD8572ARUZ handle negative input signals?

Yes, the amplifier features rail-to-rail input capability, allowing the input common-mode voltage to extend to the negative supply rail (GND).