AD8628ARZ-REEL

Overview

The AD8628ARZ-REEL is a single-channel, zero-drift operational amplifier from Analog Devices. It features rail-to-rail input and output swing with a supply voltage range of 2.7 V to 5.5 V. The device achieves ultralow offset voltage (1 µV typical) and drift (0.002 µV/°C). Key electrical parameters include a gain bandwidth product of 2.5 MHz, slew rate of 1 V/µs, and supply current of 1.0 mA. Input bias current is limited to 100 pA maximum. It operates within an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Combines auto-zeroing and chopping techniques to eliminate 1/f noise and minimize digital switching artifacts.
• Provides rail-to-rail input and output capability without requiring external components or capacitors.
• Delivers high precision through ultralow offset voltage and drift specifications across the operating temperature range.
• Features fast overload recovery time due to internal settling occurring within two clock cycles.

Applications

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

Procurement Notes

Verify that the specific package variant matches the design requirements, as the AD8628 family includes multiple pin configurations such as SOIC and SOT-23. Confirm RoHS compliance status for environmental regulations. Ensure the ordering suffix corresponds to the desired reel quantity and tape type. Cross-reference the datasheet revision to confirm all electrical characteristics align with the intended application constraints.

Selection Notes

Select this component when system accuracy requires minimal DC error sources like offset voltage and thermal drift. The rail-to-rail I/O feature simplifies biasing in low-voltage single-supply designs. Consider the 2.5 MHz bandwidth for applications needing moderate speed with high resolution. Verify that the 1.0 mA supply current fits the power budget constraints of the target system.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. While the AD8628 is a single-channel device, the family also includes dual-channel (AD8629) and quad-channel (AD8630) variants. These devices share the same patented ping-pong auto-zero and chopping topology designed to optimize noise performance and bandwidth simultaneously.

Replacement Considerations

Direct substitutes within the same family include AD8629ARZ-REEL (dual channel) and AD8630ARZ-REEL (quad channel), provided pin compatibility is verified. Automotive qualified versions are available as AD8628WARZ-REEL. Other generic chopper amplifiers may require external filtering to manage switching noise.

FAQ

Does the AD8628 require external capacitors for stability?

No, the AD8628 does not require external components or capacitors for operation.

How does the AD8628 handle 1/f noise?

The device internally eliminates 1/f noise using a combination of auto-zeroing and chopping techniques.

What is the overload recovery behavior of this amplifier?

Internal settling occurs within two clock cycles after output saturation, resulting in a very short recovery time compared to other auto-zero amplifiers.