AD8629ARZ-REEL

Overview

The AD8629ARZ-REEL is a dual-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swing, ultralow offset voltage of 1 µV, and input bias current of 100 pA maximum. The device operates on a single supply from 2.7 V to 5 V or dual supplies from ±1.35 V to ±2.5 V. Key electrical parameters include a gain bandwidth product of 2.5 MHz, slew rate of 1 V/µs, and noise density of 22 nV/√Hz at 1 kHz. It provides high CMRR and PSRR of 130 dB typical. The component is housed in an 8-lead SOIC package and supports the extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Utilizes patented auto-zeroing and chopping topology to eliminate 1/f noise and maintain low offset drift over temperature.
• Features rail-to-rail input and output swing capabilities for maximizing signal-to-noise ratio without external biasing complexity.
• Provides extremely fast overload recovery time due to internal settling within two clock cycles after output saturation.
• Operates with low supply current and requires no external capacitors for stabilization.

Applications

• Automotive sensors
• Pressure and position sensors
• Strain gage amplifiers
• Medical instrumentation
• Precision current sensing

Procurement Notes

Verify that the specific orderable part number matches the required package style and tape/reel quantity specifications. Confirm RoHS compliance status as indicated by the suffix. Ensure the procurement channel sources components directly from authorized distributors to guarantee authenticity and traceability for automotive or medical grade requirements.

Selection Notes

Select this component when system design demands ultralow DC error sources such as offset voltage and drift without the need for external trimming. The rail-to-rail I/O capability makes it suitable for low-voltage single-supply applications where maximizing dynamic range is critical. Consider the 2.5 MHz bandwidth and 1 V/µs slew rate for moderate-speed precision signal conditioning tasks.

Part Context

The AD8629ARZ-REEL belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. This series combines the benefits of auto-zeroing and chopping techniques to achieve superior precision compared to traditional chopper-stabilized amplifiers. The AD8629 specifically denotes the dual-channel version available in standard plastic packages like SOIC and MSOP.

Replacement Considerations

The AD8628WARTZ-R7 serves as a functional substitute within the same family, offering identical electrical characteristics but packaged in a 5-lead SOT-23 format instead of the 8-lead SOIC. Designers must account for pinout and physical footprint differences when transitioning between these package options.

FAQ

How does the AD8629 handle 1/f noise?

The AD8629 eliminates 1/f noise internally through its patented combination of auto-zeroing and chopping techniques, which corrects slowly varying offsets and prevents aliasing of wideband noise into the signal band.

What is the overload recovery behavior of this amplifier?

The internal settling occurs within two clock cycles after output saturation, resulting in a very short overload recovery time of less than 10 µs, which is significantly faster than many competing auto-zero amplifiers.