AD8572AR-REEL7

Overview

The AD8572AR-REEL7 is a dual-channel, 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. Key electrical specifications include a maximum offset voltage of 10 μV across the extended temperature range, an input bias current of up to 4 nA at maximum temperature, and a gain-bandwidth product of 1 MHz at 2.7 V or 1.5 MHz at 5 V. The device provides high common-mode rejection ratio (CMRR) of 130 dB typical and power supply rejection ratio (PSRR) of 130 dB typical.

Feature Summary

• Utilizes spread-spectrum auto-zero technology to eliminate intermodulation distortion effects in AC applications while maintaining near-zero drift over the operating temperature range.
• Features rail-to-rail input and output swings, allowing operation with input common-mode voltages reaching both supply rails and output voltages extending close to the supply rails under light loads.
• Incorporates ultralow input bias current characteristics and requires no external capacitors for stabilization or offset correction.

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors as counterfeits exist. Confirm package integrity upon receipt, as the SOIC-8 form factor is susceptible to mechanical damage during handling. Ensure storage conditions adhere to moisture sensitivity levels specified in the datasheet to prevent soldering defects during assembly.

Selection Notes

Select this component when high DC precision and low drift are critical requirements. The dual-channel configuration offers space efficiency compared to single-channel alternatives. Consider the specific supply voltage constraints, as bandwidth and output swing performance vary between 2.7 V and 5 V operation points defined in the electrical characteristics tables.

Part Context

This part belongs to the AD857x family of zero-drift amplifiers, which includes the single-channel AD8571 and quad-channel AD8574 variants. All members share the same core auto-zero architecture and electrical performance profile, differing primarily in channel count and pinout configurations within standard surface-mount packages like SOIC and TSSOP.

Replacement Considerations

Direct functional substitutes within the same family include the AD8572ARZ and AD8572ARUZ. Verify that replacement parts match the required package type (SOIC-8 vs. TSSOP-8) and ensure that any alternative components maintain compatibility with the 2.7 V to 5 V single-supply operating range.

FAQ

Does the AD8572 require external capacitors for offset correction?

No, the AD8572 utilizes an internal auto-zero topology that eliminates the need for external capacitors for offset correction or stabilization.

What is the mechanism used to prevent intermodulation distortion?

The device employs a spread-spectrum auto-zero technique that randomizes the chopping frequency, thereby eliminating intermodulation distortion products that typically arise from the interaction of chopping functions with signal frequencies.