ADA4638-1ARZ-R7

Overview

The ADA4638-1ARZ-R7 is a single-channel, high-voltage precision zero-drift operational amplifier manufactured by Analog Devices Inc. It operates from 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 0.95 mA. It utilizes an 8-lead SOIC package.

Feature Summary

• Patented ping-pong auto-zeroing and chopping technique for ultralow offset voltage and drift
• Rail-to-rail output swing capability across the full operating supply range
• No output phase reversal when inputs are maintained within supply voltages
• High DC accuracy with typical CMRR of 142 dB and PSRR of 143 dB

Applications

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

Procurement Notes

Verify the specific ordering suffix 'R7' corresponds to the tape-and-reel packaging configuration required for automated assembly processes. Confirm that the 8-lead SOIC package variant matches the intended PCB footprint and thermal management requirements. Ensure compliance with RoHS directives as specified in the manufacturer's documentation before final procurement.

Selection Notes

Select this component for applications requiring high DC precision without the need for external calibration due to its zero-drift architecture. It is suitable for low-frequency signal conditioning where minimizing 1/f noise and offset errors is critical. Consider the rail-to-rail output feature if maximizing dynamic range with lower supply voltages is necessary.

Part Context

This part belongs to the ADA4638-1 series of zero-drift amplifiers designed for high-precision measurement systems. It complements other Analog Devices precision op-amps by offering a combination of high voltage operation and ultra-low drift characteristics. The device is distinct from standard chopper amplifiers by its specific patented topology that optimizes noise performance.

Replacement Considerations

Public confirmed substitute part numbers: None.