AD8628ARZ-REEL7

Overview

The AD8628ARZ-REEL7 is a single-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swing with an ultralow offset voltage of 1 µV and drift of 0.002 µV/°C. The device operates on a single supply from 2.7 V to 5 V (±1.35 V to ±2.5 V dual). Key electrical parameters include a gain bandwidth product of 2.5 MHz, a slew rate of 1 V/µs, and a supply current of 1.0 mA. Input bias current is limited to 100 pA maximum, while CMRR and PSRR reach 130 dB. Voltage noise density is 22 nV/√Hz at 1 kHz, with peak-to-peak noise of 0.5 µV from 0.1 Hz to 10 Hz. It is housed in an 8-lead SOIC package.

Feature Summary

• Combines auto-zeroing and chopping technology to eliminate 1/f noise and minimize digital switching artifacts.
• Provides rail-to-rail input and output swing without requiring external components or capacitors.
• Features extremely low offset voltage and drift for high DC precision across the extended temperature range.
• Delivers fast overload recovery time due to internal settling within two clock cycles after saturation.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and packing quantity. The REEL7 suffix indicates a reel packaging format. Confirm RoHS compliance status and automotive qualification requirements if applicable to the target application environment before finalizing procurement specifications.

Selection Notes

Select this component when system design requires minimal DC error sources such as offset voltage and drift without the need for external trimming. The rail-to-rail capability simplifies input biasing and maximizes signal-to-noise ratio in single-supply systems. Ensure the required bandwidth and slew rate align with the 2.5 MHz GBP and 1 V/µs performance limits for the intended signal frequencies.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift, single-supply, rail-to-rail input/output operational amplifiers. The AD8628 variant specifically provides a single amplifier channel. The family utilizes a patented ping-pong arrangement of auto-zeroing and chopping to achieve low noise and high accuracy previously found only in more expensive amplifiers.

Replacement Considerations

Direct functional substitutes within the same series include the AD8629 (dual channel) and AD8630 (quad channel), provided pin compatibility and channel count requirements are met. Automotive qualified versions are available under the AD8628W designation.

FAQ

Does the AD8628 exhibit output phase reversal?

No, the AD8628 is designed to prevent output phase reversal as long as both inputs are maintained within the supply voltages.

How does the AD8628 handle 1/f noise?

The internal auto-zeroing mechanism corrects DC and low-frequency offsets, effectively eliminating 1/f noise internally.