AD8628WARTZ-RL

Overview

The AD8628WARTZ-RL is a single-channel, zero-drift operational amplifier from Analog Devices, designed for high-precision applications. It features rail-to-rail input and output capabilities with a gain-bandwidth product of 2.5 MHz at 5 V supply. Key electrical parameters include an input offset voltage of 1 µV, input bias current of 100 pA maximum, and supply current of 1.1 mA. The device operates within a supply voltage range of 2.7 V to 5 V (±1.35 V to ±2.5 V dual) and supports an extended industrial temperature range from -40°C to +125°C. It offers high common-mode rejection ratio (CMRR) of 140 dB and power supply rejection ratio (PSRR) of 130 dB.

Feature Summary

• Zero-drift architecture combining auto-zeroing and chopping techniques to minimize offset voltage and drift over temperature.
• Rail-to-rail input and output swing capability allowing full signal utilization across the supply range.
• Automotive qualification ensuring reliability and controlled manufacturing standards for vehicle applications.
• Low noise performance with internal elimination of 1/f noise for improved signal integrity in DC measurements.

Applications

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

Procurement Notes

Verify the specific package variant, as the AD8628 series includes both SOT-23 and TSOT packages. Confirm automotive grade requirements against commercial specifications if used in non-automotive contexts. Check for RoHS compliance status and ensure ESD precautions are observed during handling due to sensitivity. Validate supply voltage ranges match system design constraints before integration.

Selection Notes

Select this component when ultralow offset voltage and drift are critical for measurement accuracy. Consider the rail-to-rail I/O feature for maximizing dynamic range in single-supply systems. Evaluate the low input bias current requirement for high-impedance sensor interfaces. Ensure the operating temperature range aligns with the intended environmental conditions.

Part Context

The AD8628WARTZ-RL belongs to the AD8628/AD8629/AD8630 family of zero-drift operational amplifiers. It is specifically the single-channel version packaged in a 5-lead SOT-23 format. The 'W' suffix indicates automotive qualification, while 'ARTZ' denotes the specific package and RoHS compliance. This part is part of Analog Devices' precision amplifier portfolio designed for harsh environments.

Replacement Considerations

Direct substitutes within the same family include AD8628ARTZ-REEL7 and AD8628AUJZ-REEL7, though package differences must be accounted for. Cross-referencing with other zero-drift amplifiers requires verifying pin compatibility and electrical parameter equivalence, particularly offset voltage and bandwidth specifications.

FAQ

What is the typical overload recovery time for the AD8628?

The AD8628 has an overload recovery time of less than 10 µs, specifically 6 µs for positive overload and 9 µs for negative overload, which is significantly faster than many competing auto-zero amplifiers.

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. If inputs exceed supply rails, series resistors should be used to limit current.

How does the AD8628 handle 1/f noise?

The AD8628 internally eliminates 1/f noise through its auto-zeroing mechanism, which corrects slowly varying offsets, thereby reducing output errors in DC-coupled measurements without requiring external filtering.