AD8628WARZ-RL

Overview

The AD8628WARZ-RL is a single-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swing with a gain bandwidth product of 2.5 MHz at 5 V supply. The device exhibits an ultralow offset voltage of 1 µV and an input offset drift of 0.002 µV/°C. Operating from a single supply of 2.7 V to 5.5 V, it draws a typical supply current of 1.0 mA. The component is housed in an 8-lead SOIC package and is qualified for automotive applications.

Feature Summary

• Utilizes patented auto-zeroing and chopping topology to eliminate 1/f noise and minimize digital switching artifacts.
• Provides rail-to-rail input and output capability to maximize signal-to-noise ratio without external biasing complexity.
• Delivers high precision through extremely low offset voltage and drift across the extended industrial temperature range.
• Features rapid overload recovery time to maintain performance when driving switched capacitor loads.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and packing quantity. Ensure the automotive qualification status aligns with project requirements. Cross-reference the datasheet revision to validate electrical characteristics before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring high DC precision and low noise without external filtering capacitors. Consider the 8-lead SOIC package constraints regarding thermal dissipation and board space. Evaluate the 2.5 MHz bandwidth against system signal frequencies to ensure adequate gain margin and stability.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. The 'W' designation indicates automotive qualification, while 'ARZ' specifies the 8-lead SOIC package variant. The '-RL' suffix denotes reel packaging. This series combines low cost with high accuracy typically found in more expensive chopper-stabilized amplifiers.

Replacement Considerations

Direct functional substitutes within the same family include the AD8629 (dual channel) and AD8630 (quad channel). Verify pin compatibility and package dimensions when replacing with other variants in the AD862x series.

FAQ

Does the AD8628 require external capacitors for operation?

No, the AD8628 does not require external components or capacitors for its auto-zeroing function.

What is the mechanism used to reduce noise in this amplifier?

It uses a patented combination of auto-zeroing and chopping techniques to achieve low noise and eliminate 1/f noise internally.