AD8629ARMZ-REEL

Overview

The AD8629ARMZ-REEL is a dual-channel, zero-drift operational amplifier featuring rail-to-rail input and output swing. It operates on a single supply from 2.7 V to 5 V or dual supplies of ±1.35 V to ±2.5 V. Key electrical specifications include a maximum offset voltage of 1 µV at 25°C and 10 µV across the temperature range, with an input offset drift of 0.002 µV/°C. The device offers a gain bandwidth product of 2.5 MHz, a slew rate of 1 V/µs, and a typical noise density of 22 nV/√Hz at 1 kHz. Peak-to-peak noise is 0.5 µV in the 0.1 Hz to 10 Hz band. It provides high gain (145 dB), CMRR (140 dB), and PSRR (130 dB) with a supply current of 1.0 mA per amplifier.

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 capability to maximize signal-to-noise ratio and simplify biasing.
• Features ultralow offset voltage and drift for high DC precision without requiring external components.
• 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 that the ordering suffix 'REEL' corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm the package type matches the MSOP footprint dimensions specified in the outline drawings. Ensure the component meets RoHS compliance standards as indicated by the 'Z' suffix in the base part number.

Selection Notes

Select this component when system requirements demand minimal offset voltage and drift over extended temperature ranges without the complexity of external trimming. The rail-to-rail I/O functionality makes it suitable for low-voltage single-supply designs where maximizing dynamic range is critical. Consider the 2.5 MHz bandwidth for applications requiring moderate speed alongside high DC accuracy.

Part Context

This device belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers manufactured by Analog Devices. The AD8629 specifically denotes the dual-channel variant housed in an 8-lead MSOP plastic package. It shares architectural similarities with the single-channel AD8628 and quad-channel AD8630 but is optimized for space-constrained dual-channel applications.

Replacement Considerations

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