AD8638ARZ-REEL

Overview

The AD8638ARZ-REEL is a single-channel, auto-zero operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail output swing and operates on a single supply from 5 V to 16 V or dual supplies of ±2.5 V to ±8 V. The device provides high precision with a maximum offset voltage of 9 μV and an extremely low drift of 0.04 μV/°C. Key electrical parameters include a gain bandwidth product of 1.5 MHz, a slew rate of 2.5 V/μs, and a typical power supply rejection ratio of 143 dB. It consumes a maximum supply current of 1.5 mA per amplifier.

Feature Summary

• Utilizes a patented ping-pong auto-zeroing topology to eliminate 1/f noise and maintain ultra-low offset voltage across the operating temperature range.
• Features rail-to-rail output capability that maximizes signal-to-noise ratio in low-voltage applications.
• Provides fast overload recovery time of less than 50 μs, allowing rapid re-stabilization after saturation events.

Applications

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

Procurement Notes

Verify the specific package type against the datasheet ordering guide, as the AD8638 series includes multiple configurations such as SOT-23 and SOIC. Confirm that the REEL suffix corresponds to tape-and-reel packaging suitable for automated assembly processes. Ensure the component meets the required industrial temperature specifications before finalizing procurement.

Selection Notes

Select this component when high DC precision and low drift are critical requirements. The auto-zero architecture makes it suitable for applications where traditional chopper amplifiers introduce excessive switching noise. Consider the rail-to-rail output feature if maximizing dynamic range within limited supply voltages is necessary for the system design.

Part Context

This part belongs to the AD8638/AD8639 family of wide bandwidth, auto-zero amplifiers designed for ultrahigh precision applications. The AD8638 specifically denotes the single-channel version of this series, offering benefits previously found only in more expensive zero-drift amplifiers while maintaining low cost and low noise performance.

Replacement Considerations

The AD8639 serves as the dual-channel counterpart within the same family. Other members of the Analog Devices auto-zero op amp series include the AD8628, AD8629, AD8538, AD8539, and AD8630, which may offer different supply voltage ranges or channel counts depending on specific application needs.