AD8638ARZ-REEL7

Overview

The AD8638ARZ-REEL7 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 of 5 V to 16 V or dual supplies of ±2.5 V to ±8 V. Key electrical specifications include a maximum offset voltage of 9 μV, an input bias current of 40 pA, and a gain bandwidth product of 1.5 MHz. The device provides high precision with a typical open-loop gain of 136 dB and low noise characteristics.

Feature Summary

• Utilizes patented auto-zeroing topology to maintain extremely low offset voltage and drift across the operating temperature range.
• Features rail-to-rail output capability to maximize signal-to-noise ratio in single-supply applications.
• Incorporates internal elimination of 1/f noise to significantly reduce DC measurement errors.
• Provides fast overload recovery time of less than 50 μs following output saturation.

Applications

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

Procurement Notes

Verify that the specific package variant matches the design requirements, as the AD8638 series includes both SOT-23 and SOIC packages. Confirm the REEL7 suffix indicates tape and reel packaging for automated assembly. Ensure the component meets the required industrial temperature range specifications before finalizing procurement.

Selection Notes

Select this component when high DC precision and low drift are critical for the application. It is suitable for systems requiring true 16-bit accuracy within a 5 kHz to 10 kHz signal bandwidth. Consider the rail-to-rail output feature if maximizing dynamic range in single-supply designs is necessary.

Part Context

The AD8638/AD8639 series represents a family of wide bandwidth, auto-zero amplifiers designed to combine high accuracy with low cost. These devices utilize a ping-pong arrangement of auto-zeroing and chopping to optimize noise performance. The AD8638 specifically refers to the single-channel version available in compact surface-mount packages.

Replacement Considerations

Public confirmed substitute part numbers: AD8638ARJZ-R2 (SOT-23 package variant).