AD8628WARZ-R7

Overview

The AD8628WARZ-R7 is a single-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output capabilities with a gain bandwidth product of 2.5 MHz and a slew rate of 1 V/µs. The device operates on a supply voltage range from 2.7 V to 5 V (±1.35 V to ±2.5 V dual). Key electrical specifications include an input offset voltage of 1 µV, input bias current of 100 pA maximum, and supply current of 1.1 mA. It provides a common-mode rejection ratio of 140 dB and operates within a temperature range of -40°C to +125°C.

Feature Summary

• Combines auto-zeroing and chopping technology to achieve ultralow offset voltage and drift while minimizing digital switching noise.
• Features rail-to-rail input and output swing capability for maximizing signal-to-noise ratio in low-voltage systems.
• Includes internal elimination of 1/f noise to reduce dc-coupled measurement errors without requiring external filtering components.

Applications

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

Procurement Notes

Verify the specific package type and automotive qualification status against the manufacturer's official ordering guide. Confirm that the component meets RoHS compliance requirements for your target market. Ensure that the operating conditions align with the specified absolute maximum ratings to prevent device damage.

Selection Notes

Select this component when high dc precision and low drift are critical over wide temperature ranges. The rail-to-rail performance suits single-supply applications where maximizing dynamic range is necessary. Consider the overload recovery time and noise characteristics relative to the system bandwidth requirements.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. The 'W' suffix indicates automotive qualification, while 'R7' denotes reel packaging. It shares core topology with commercial variants but adheres to stricter manufacturing controls for automotive reliability standards.

Replacement Considerations

Direct substitutes within the same family include AD8628ARZ or AD8628ARTZ for non-automotive grades. Verify pin compatibility and thermal characteristics when replacing with other packages such as MSOP or TSOT.

FAQ

How does the AD8628 handle 1/f noise?

The amplifier internally eliminates 1/f noise through its auto-zeroing mechanism, which corrects slowly varying offsets, thereby reducing dc measurement errors without external filtering.

What is the overload recovery time for this amplifier?

The internal settling occurs within two clock cycles after output saturation, resulting in an overload recovery time of less than 10 µs.