AD8629ARMZ

Overview

The AD8629ARMZ is a dual-channel, zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swing and operates on a single supply voltage ranging from 2.7 V to 5 V. The device utilizes a patented auto-zeroing and chopping topology to achieve ultralow offset voltage of 1 µV and minimal drift of 0.002 µV/°C. Key electrical parameters include a gain-bandwidth product of 2.5 MHz, a slew rate of 1 V/µs, and a maximum input bias current of 100 pA. It provides high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) at 130 dB. The component is housed in an 8-lead MSOP package and supports an extended industrial operating temperature range from -40°C to +125°C.

Feature Summary

• Patented combination of auto-zeroing and chopping techniques eliminates low-frequency noise and minimizes digital switching artifacts.
• Rail-to-rail input and output capability maximizes signal-to-noise ratio while reducing input biasing complexity.
• Ultralow offset voltage and drift ensure high precision across the full operating temperature range without requiring external components.
• Fast overload recovery time allows efficient operation when driving switched capacitor loads or handling transient inputs.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and packing quantity. Ensure compatibility with the required operating temperature range and supply voltage specifications for the target application environment before finalizing procurement decisions.

Selection Notes

Select this component for applications demanding high DC precision with minimal drift over wide temperature variations. The rail-to-rail I/O makes it suitable for low-voltage single-supply systems where maximizing dynamic range is critical. Consider the 8-lead MSOP package for space-constrained designs requiring surface-mount assembly.

Part Context

This part belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. While the AD8628 offers single-channel configurations and the AD8630 provides four channels, the AD8629 specifically integrates two independent channels within a compact footprint. All variants share the same core auto-zero technology and electrical characteristics.

Replacement Considerations

MS8629 is documented as pin-to-pin compatible with the AD8629 series.

FAQ

Does the AD8629 require external capacitors for its auto-zero function?

No, the AD8629 does not require any external components to operate its internal auto-zeroing and chopping circuitry.

How does the AD8629 handle output phase reversal?

The device is designed to prevent output phase reversal provided that both inputs remain within the supply voltage rails.