AD8639ACPZ-R2

Overview

The AD8639ACPZ-R2 is a dual-channel, auto-zero operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail output swing and operates on single supplies from 5 V to 16 V or dual supplies from ±2.5 V to ±8 V. Key electrical specifications include a maximum offset voltage of 9 μV, a maximum offset drift of 0.04 μV/°C, and a maximum input bias current of 40 pA. The device provides a typical gain bandwidth product of 1.5 MHz and a slew rate of 2 V/μs at 16 V operation. It is qualified for automotive applications and housed in an 8-lead LFCSP package.

Feature Summary

• Patented auto-zero topology that combines chopping and auto-zeroing techniques to minimize low-frequency noise and digital switching artifacts without requiring external filtering components.
• Rail-to-rail output capability that maximizes signal-to-noise ratio by utilizing the full available supply voltage range.
• Extremely low offset voltage and drift characteristics ensure high precision and stability across the extended industrial temperature range.

Applications

• Pressure and position sensors
• Strain gage amplifiers
• Medical instrumentation
• Thermocouple amplifiers
• Automotive sensors

Procurement Notes

Verify the specific suffix 'ACPZ-R2' against the manufacturer's official ordering guide to confirm the exact package type (LFCSP) and reel packaging configuration. Ensure compatibility with the required operating temperature range and automotive qualification standards before finalizing procurement decisions.

Selection Notes

Select this component when high DC precision is required alongside wide bandwidth and low noise. The dual-channel configuration is suitable for differential sensing or multi-channel data acquisition systems. Verify that the input common-mode voltage remains within the specified limits to prevent output phase reversal.

Part Context

The AD8639 is part of the AD8638/AD8639 series of wide bandwidth, auto-zero amplifiers. While the AD8638 offers a single channel, the AD8639 provides two channels in compact packages including MSOP, SOIC, and LFCSP. This series is designed to replace expensive zero-drift amplifiers while maintaining high accuracy.

Replacement Considerations

The AD8638 serves as the single-channel counterpart within the same family. Other members of the Analog Devices auto-zero op amp series may offer similar performance characteristics but differ in channel count, supply voltage ranges, or package options.

FAQ

Does the AD8639 exhibit output phase reversal?

No, the AD8639 is designed to prevent output phase reversal provided both inputs are maintained within the specified input voltage range.

How does the AD8639 handle overload recovery?

Internal settling occurs within two clock cycles after output saturation, resulting in a recovery time of less than 50 μs.