AD8622ARMZ

Overview

The AD8622ARMZ is a dual precision operational amplifier from Analog Devices, housed in an 8-lead MSOP package. It features rail-to-rail output swing and operates within a supply voltage range of ±2.5 V to ±15 V. The device exhibits a maximum input offset voltage of 125 μV and a typical drift of 0.5 μV/°C across the −40°C to +125°C temperature range. Supply current is typically 215 μA per amplifier. Key electrical parameters include a gain-bandwidth product of 560 kHz at ±15 V, a slew rate of 0.48 V/μs, and a voltage noise density of 11 nV/√Hz.

Feature Summary

• Features input bias current cancellation circuitry for very low bias current over the full operating temperature.
• Provides rail-to-rail output swing with unity gain stability.
• Designed to prevent phase reversal when inputs exceed the common-mode voltage range but remain within supply rails.

Applications

• Portable precision instrumentation
• Laser diode control loops
• Strain gage amplifiers
• Medical instrumentation
• Thermocouple amplifiers

Procurement Notes

Verify that the ordering suffix matches the required packaging format, as the AD8622ARMZ designation specifically indicates the 8-lead MSOP tube configuration. Confirm RoHS compliance status if environmental regulations apply to the assembly process. Ensure the selected variant aligns with the specific thermal resistance requirements of the target PCB layout.

Selection Notes

Select this component for applications requiring high DC precision combined with low power consumption. The device is suitable where large error sources cannot be tolerated due to its ultralow offset and drift characteristics. Consider the MSOP package dimensions for space-constrained designs. Evaluate the trade-off between the 560 kHz bandwidth and the low quiescent current for battery-powered systems.

Part Context

This part belongs to the AD8622/AD8624 family of low-power, precision, rail-to-rail output operational amplifiers. The AD8622 provides two independent amplifiers in a single package, while the AD8624 offers four. Both families share similar electrical specifications and are designed to maximize signal-to-noise ratio and dynamic range for low-power operation.

Replacement Considerations

The AD8622ARZ serves as a direct pin-compatible alternative in the 8-lead SOIC package. Other members of the AD862x family may offer different channel counts or package options but maintain comparable performance metrics.

FAQ

Does the AD8622 experience phase reversal?

No, the AD8622 is designed to prevent output phase reversal even if one or both inputs exceed the specified input voltage range, provided they remain within the supply rails.

What is the purpose of the internal bias cancellation?

The input bias current cancellation circuitry ensures that the input bias current remains very low over the entire operating temperature range.