ADA4638-1ARZ-RL

Overview

The ADA4638-1ARZ-RL is a single-channel, high-voltage precision zero-drift amplifier manufactured by Analog Devices Inc. It operates on a single supply of 4.5 V to 30 V or dual supplies of ±2.25 V to ±15 V. Key electrical specifications include a maximum input offset voltage of 4 μV at 10 V and 4.5 μV at 30 V, with an offset drift of 0.05 μV/°C (SOIC). The device features a gain-bandwidth product of 1.5 MHz, a slew rate of 1.5 V/μs, and a supply current of less than 0.95 mA. It offers rail-to-rail output swing, 130 dB minimum open-loop gain, and 142 dB typical CMRR.

Feature Summary

• Utilizes a patented combination of auto-zeroing and chopping techniques to achieve ultralow offset voltage and minimal drift over temperature.
• Features rail-to-rail output capability that maximizes signal-to-noise ratio in low-voltage applications.
• Designed with no output phase reversal when inputs are maintained within the supply voltage range.

Applications

• Electronic weigh scales
• Pressure and position sensors
• Strain gage amplifiers
• Medical instrumentation
• Thermocouple amplifiers

Procurement Notes

Verify the specific package type matches the required PCB footprint, as the ARZ suffix denotes an 8-lead SOIC package. Confirm the -RL suffix indicates reel packaging for automated assembly processes. Ensure the operating environment stays within the specified -40°C to +125°C industrial temperature range to maintain guaranteed electrical performance parameters.

Selection Notes

Select this component for applications requiring high DC accuracy without external trimming due to its zero-drift architecture. It is suitable for high-gain amplification of low-level signals where 1/f noise must be eliminated. Consider the 1.5 MHz bandwidth for dynamic signal requirements and verify that the 0.95 mA supply current aligns with power budget constraints.

Part Context

This part belongs to the ADA4638-1 series of high-voltage, high-precision zero-drift amplifiers. It is available in both 8-lead LFCSP and 8-lead SOIC packages. The device is designed to replace traditional chopper-stabilized amplifiers while offering superior low-frequency noise performance through its unique ping-pong auto-zeroing and chopping topology.

Replacement Considerations

Public confirmed substitute part numbers: AD8630.