AD8639WARZ-RL

Overview

The AD8639WARZ-RL is a dual-channel, wide bandwidth auto-zero operational amplifier manufactured by Analog Devices. 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 exhibits low offset voltage (maximum 9 μV), minimal drift (0.04 μV/°C maximum), and very low input bias current (40 pA maximum). It provides high gain (136 dB typical) and high CMRR (133 dB typical). Qualified for automotive applications, it functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Patented auto-zero topology combining chopping and auto-zeroing to minimize low-frequency noise and digital switching artifacts without external filtering.
• Rail-to-rail output capability maximizes signal-to-noise ratio across the full supply voltage range.
• Extremely low offset voltage and drift ensure stable precision over the entire operating temperature range.
• Very low input bias current reduces errors associated with high source impedances.

Applications

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

Procurement Notes

Verify the specific package type and tape-and-reel configuration against the official Analog Devices ordering guide. Confirm that the automotive qualification status aligns with your system requirements. Ensure the lead marking and date code match the intended production batch. Cross-reference the datasheet revision to confirm all electrical characteristics are current.

Selection Notes

Select this component when high DC precision and low drift are critical in harsh environments. The dual-channel architecture saves board space compared to single-channel alternatives. Consider the rail-to-rail output if maximizing dynamic range is necessary. Verify that the input common-mode voltage range accommodates your signal levels to prevent phase reversal.

Part Context

The AD8639 is part of the AD8638/AD8639 family of auto-zero amplifiers. It serves as the dual-channel counterpart to the single-channel AD8638. Both devices share identical electrical specifications and utilize the same patented ping-pong auto-zero topology. This family bridges the gap between standard precision op amps and expensive zero-drift solutions.

Replacement Considerations

The AD8638 is the single-channel equivalent within the same family. Other Analog Devices auto-zero amplifiers may offer different channel counts or supply ranges but require verification of pin compatibility and electrical performance overlap.