AD8628ARTZ-R2

Overview

The AD8628ARTZ-R2 is a single-channel, zero-drift operational amplifier from Analog Devices. It features rail-to-rail input and output capabilities with a gain bandwidth product of 2.5 MHz at 5 V supply. The device operates on a single supply voltage ranging from 2.7 V to 5 V. Key electrical specifications include an input offset voltage of 1 µV, an input bias current of 30 pA typical, and a supply current of 0.85 mA typical. It provides a large signal voltage gain of 145 dB and a power supply rejection ratio of 130 dB.

Feature Summary

• Combines auto-zeroing and chopping techniques to achieve ultralow offset voltage and drift while minimizing digital switching noise.
• Features rail-to-rail input and output swing to maximize dynamic range and simplify input biasing requirements.
• Includes internal elimination of 1/f noise to reduce errors in DC-coupled measurements without external filtering components.

Applications

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

Procurement Notes

Verify the specific package marking code A0L for the 5-Lead SOT-23 configuration. Confirm that the Reel packing quantity matches project requirements. Ensure compatibility with the -40°C to +125°C operating temperature range. Check for RoHS compliance status as indicated by the Z suffix. Validate pinout alignment with the RJ-5 outline dimensions before PCB layout finalization.

Selection Notes

Select this component when high DC precision is required alongside low noise performance. The integrated zero-drift topology eliminates the need for external capacitors typically used in chopper amplifiers. Consider the 2.5 MHz bandwidth for applications requiring faster settling than standard auto-zero amplifiers. Evaluate the 100 pA maximum input bias current for high-impedance sensor interfaces.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. The AD8628 variant specifically denotes a single-channel configuration. It utilizes a patented ping-pong arrangement of auto-zeroing and chopping to optimize noise and bandwidth characteristics compared to previous generations.

Replacement Considerations

Direct substitutes within the same family include AD8628ARTZ-REEL7 for different reel quantities. Automotive qualified versions are available as AD8628WARTZ variants. Other channel counts in the series include AD8629 (dual) and AD8630 (quad).

FAQ

Does the AD8628ARTZ-R2 require external components for its zero-drift operation?

No external capacitor is required for the auto-zeroing function. The internal circuitry handles the correction automatically.

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.