AD8628ART-R2

Overview

The AD8628ART-R2 is a single-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swing and operates on a single supply voltage ranging from 2.7 V to 5 V (or ±1.35 V to ±2.5 V dual supply). The device utilizes a patented auto-zeroing and chopping topology to achieve an ultralow offset voltage of 1 µV and an input offset drift of 0.002 µV/°C. It provides a gain bandwidth product of 2.5 MHz, a slew rate of 1 V/µs, and low supply current of 1.0 mA. The component is housed in a 5-lead SOT-23 package and is rated for an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Patented ping-pong auto-zeroing and chopping topology eliminates 1/f noise and minimizes digital switching artifacts.
• Rail-to-rail input and output capability maximizes signal-to-noise ratio while reducing input biasing complexity.
• Ultralow offset voltage and drift ensure high DC precision across the full operating temperature range without external trimming.
• Fast overload recovery time allows rapid settling after saturation, suitable for driving switched capacitor ADCs.

Applications

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

Procurement Notes

Verify the specific ordering suffix ARTZ-R2 against the manufacturer's official Ordering Guide to confirm the 5-Lead SOT-23 package and reel quantity specifications. Ensure that the automotive qualification status aligns with project requirements, as distinct W-suffixed variants may exist within the same family. Cross-reference the datasheet revision M electrical characteristics for accurate performance data at the intended supply voltages.

Selection Notes

Select this component when system design requires high DC accuracy with minimal offset error sources. The rail-to-rail architecture is optimal for low-voltage single-supply applications where maximizing dynamic range is critical. Consider the 2.5 MHz bandwidth and fast recovery times for applications involving moderate signal speeds or transient loads. Verify thermal management needs based on the SOT-23 package thermal resistance characteristics.

Part Context

The AD8628 belongs to a series of zero-drift amplifiers that includes the dual-channel AD8629 and quad-channel AD8630. All models share the same core auto-zero/chop technology and electrical performance profile. The AD8628 specifically offers a single amplifier configuration, making it suitable for cost-sensitive or space-constrained designs requiring only one channel of high-precision signal conditioning.

Replacement Considerations

Direct functional equivalents within the same package include the AD8628ARTZ-REEL7. For automotive-grade requirements, consider the AD8628WARTZ-R2 variant, which maintains identical electrical specifications but adheres to controlled manufacturing processes for automotive reliability.

FAQ

Does the AD8628 exhibit output phase reversal?

No, the AD8628 is designed to prevent output phase reversal provided that both inputs are maintained within the supply voltages.

How does the AD8628 handle 1/f noise?

The internal auto-zeroing mechanism corrects slowly varying offsets, effectively eliminating 1/f noise internally without requiring external filtering components.

What is the maximum differential input voltage?

The differential input voltage is limited to ±5.0 V or the supply voltage, whichever is less.