AD8639WARZ-R7

Overview

The AD8639WARZ-R7 is a dual-channel, auto-zero operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail output swing and operates on single supplies from 5 V to 16 V or dual supplies from ±2.5 V to ±8 V. The device offers a maximum offset voltage of 9 μV with a drift of 0.04 μV/°C. It provides high gain (136 dB typical), CMRR (133 dB typical), and PSRR (143 dB typical). Input bias current is limited to 40 pA maximum, while supply current per amplifier is 1.3 mA maximum. It is qualified for automotive applications and housed in an 8-lead MSOP package.

Feature Summary

• Auto-zero topology eliminates 1/f noise and maintains low offset voltage over temperature and time without external capacitors.
• Rail-to-rail output swing maximizes signal-to-noise ratio across the full supply range.
• Automotive qualification ensures reliability for demanding sensor environments.
• Very low input bias current minimizes errors when interfacing with high-impedance sources.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and reel specifications. Ensure compatibility with the required operating temperature range and supply voltage constraints before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring high DC precision and low drift without the digital switching noise associated with traditional chopper amplifiers. Consider the 8-lead MSOP package for space-constrained designs. Verify that input common-mode voltages remain within the specified range to prevent output phase reversal.

Part Context

The AD8639 is part of the AD8638/AD8639 family of wide bandwidth, auto-zero amplifiers. It serves as the dual-channel counterpart to the single-channel AD8638. Both devices utilize Analog Devices' patented ping-pong auto-zeroing and chopping arrangement to achieve ultrahigh precision and low noise performance suitable for harsh industrial and automotive environments.

Replacement Considerations

Consult the manufacturer's ordering guide for direct equivalents. Cross-referencing requires matching channel count, package style, and electrical characteristics such as offset voltage and supply range.

FAQ

Does the AD8639 exhibit output phase reversal?

No, the AD8639 is designed to prevent output phase reversal provided both inputs are maintained within the specified input voltage range.

How does the AD8639 handle overload recovery?

Internal settling occurs within two clock cycles after output saturation, resulting in a recovery time of less than 50 μs.