AD8538ARZ

Overview

The AD8538ARZ is a single-channel, low-power, precision auto-zero operational amplifier manufactured by Analog Devices Inc. It operates on a single supply voltage ranging from 2.7 V to 5.5 V and is housed in an 8-lead narrow body SOIC package. The device features a maximum input offset voltage of 13 µV and an extremely low input offset drift of 0.03 µV/°C across the extended industrial temperature range of -40°C to +125°C. Supply current consumption is typically 180 µA per amplifier at 5.0 V. Key dynamic performance metrics include a gain bandwidth product of 430 kHz and a slew rate of 0.4 V/µs.

Feature Summary

• Auto-zero architecture ensures high DC precision with minimal offset voltage and drift over temperature variations.
• Low power consumption design suitable for battery-powered applications with typical supply current of 180 µA.
• High common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) for signal integrity.

Applications

• Portable instrumentation
• Battery-powered devices
• Sensor interfaces
• Temperature measurement
• Electronic scales

Procurement Notes

Verify the specific ordering suffix 'RZ' corresponds to the RoHS-compliant 8-lead SOIC package variant. Confirm that the automotive grade designation 'W' is not required if the application does not demand controlled manufacturing for automotive reliability. Ensure the component matches the commercial specifications provided in the datasheet rather than the potentially differing automotive model parameters.

Selection Notes

Select this component when high DC accuracy is required alongside low power consumption in single-supply systems. The auto-zero technology eliminates the need for external chopper stabilization circuits. Consider the 8-lead SOIC package for standard surface-mount assembly processes. Evaluate the 430 kHz bandwidth against system requirements to ensure adequate speed for the intended signal processing tasks.

Part Context

The AD8538ARZ belongs to the AD8538/AD8539 family of low-power, precision auto-zero amplifiers. While the AD8539 offers dual channels, the AD8538 provides a single channel configuration. Both share similar electrical characteristics but differ in channel count and pinout configurations within the 8-lead packages. This family is designed for applications requiring high precision without the complexity of traditional chopper-stabilized amplifiers.

Replacement Considerations

The AD8539ARZ serves as a functional substitute if dual-channel capability is needed, sharing identical electrical specifications and package options. Designers should verify pin compatibility and channel requirements before substitution.

FAQ

What is the maximum input offset voltage for the AD8538ARZ?

The maximum input offset voltage is 13 µV at 25°C and increases to 30 µV across the full operating temperature range of -40°C to +125°C.

Does the AD8538ARZ support rail-to-rail output?

No, the datasheet specifies output saturation voltages relative to the supply rails but does not claim true rail-to-rail output swing. The output can swing close to the negative rail and within millivolts of the positive rail under light loads.

Is the AD8538ARZ qualified for automotive applications?

The standard AD8538ARZ is a commercial grade part. Automotive qualification is available specifically for the AD8538W model, which may have different specifications.