AD8628WARTZ-R7

Overview

The AD8628WARTZ-R7 is a single-channel, zero-drift operational amplifier from Analog Devices, packaged in a 5-lead SOT-23. 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 exhibits an input offset voltage of 1 µV and an input bias current of 100 pA maximum. Operating on a supply voltage range of 2.7 V to 5.5 V, it consumes 1.1 mA of supply current. Key performance metrics include a common-mode rejection ratio of 140 dB and a power supply rejection ratio of 130 dB. It is qualified for automotive applications and operates within a temperature range of -40°C to +125°C.

Feature Summary

• Utilizes a patented auto-zeroing and chopping topology to achieve ultralow offset voltage and drift without requiring external components.
• Provides rail-to-rail input and output swing to maximize signal-to-noise ratio while reducing input biasing complexity.
• Features extremely low input bias current and eliminates 1/f noise internally to ensure high precision in DC-coupled measurements.
• Delivers fast overload recovery time due to internal settling occurring within two clock cycles after output saturation.

Applications

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

Procurement Notes

Verify the specific ordering suffix to confirm package type and reel quantity. Confirm that the 'W' designation indicates automotive qualification if required for the application. Ensure compatibility with the target PCB footprint for the 5-lead SOT-23 package. Check for RoHS compliance status as indicated by the 'Z' suffix. Validate supply voltage requirements against the 2.7 V to 5.5 V operating range.

Selection Notes

Select this component when high DC precision and low drift are critical over a wide temperature range. It is suitable for applications requiring rail-to-rail operation with minimal external filtering. Consider the 2.5 MHz bandwidth for systems needing true 16-bit accuracy. Evaluate the low supply current for battery-powered designs. Ensure the input signals remain within the supply rails to prevent phase reversal.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. The AD8628 is the single-channel variant, while the AD8629 and AD8630 offer dual and quad channels respectively. All variants share the same core technology and electrical characteristics, differing primarily in channel count and available packages. The 'W' suffix denotes automotive grade qualification.

Replacement Considerations

MS8628/MS8629 are pin-to-pin compatible alternatives offering similar output swing and low noise characteristics.

FAQ

Does the AD8628 require external capacitors for its auto-zero function?

No, the AD8628 does not require any external components for its auto-zeroing and chopping operation.

What is the typical overload recovery time for this amplifier?

The overload recovery time is less than 10 µs, specifically around 6 µs for positive and 9 µs for negative overload conditions.