AD8538AUJZ-R2

Overview

The AD8538AUJZ-R2 is a single-channel, low-power, precision auto-zero operational amplifier manufactured by Analog Devices Inc. It features an extremely low maximum input offset voltage of 13 µV and an input offset drift of 0.03 µV/°C across the extended industrial temperature range of −40°C to +125°C. The device operates on a single supply from 2.7 V to 5.5 V or dual supplies of ±1.35 V to ±2.5 V, consuming a typical supply current of 180 µA per amplifier. Key electrical specifications include a gain bandwidth product of 430 kHz, a slew rate of 0.4 V/µs, and a minimum common-mode rejection ratio of 115 dB.

Feature Summary

• Utilizes auto-zero architecture to achieve ultra-low offset voltage and minimal drift over temperature variations.
• Designed for high-precision applications with exceptionally low input bias current and low power consumption.
• Operates effectively within a wide single-supply voltage range suitable for battery-powered systems.

Applications

• Mobile communications
• Portable instrumentation
• Battery-powered devices
• Sensor interfaces
• Temperature measurement

Procurement Notes

Verify that the specific ordering suffix matches the required package type and reel configuration. Confirm RoHS compliance status as indicated by the Z suffix in the part number. Ensure the automotive qualification requirements are met if applicable, noting that standard commercial models differ from qualified automotive variants. Cross-reference the manufacturer's latest datasheet revision for any updates to mechanical dimensions or electrical limits before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring high DC accuracy with strict power constraints. The low supply current makes it suitable for portable equipment where battery life is critical. Consider the 5-lead TSOT-23 package for space-constrained layouts. Verify that the required gain bandwidth and slew rate meet the signal processing needs, as the device is optimized for precision rather than high-speed performance.

Part Context

This part belongs to the AD8538/AD8539 family of low-power, precision auto-zero amplifiers. The AD8538 is the single-channel version, while the AD8539 provides dual channels. Both share similar core technologies but differ in channel count and specific pin configurations. The AUJZ designation specifically identifies the 5-lead TSOT-23 surface-mount package variant.

Replacement Considerations

Direct functional substitutes within the same package may include other single-channel auto-zero amplifiers from Analog Devices, such as the AD8638 series, though electrical parameters like offset voltage and bandwidth will differ. Verify pin compatibility and thermal characteristics before substitution.

FAQ

What is the maximum input offset voltage specified for the AD8538?

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 AD8538 support rail-to-rail output?

No, the datasheet does not specify rail-to-rail output capability. The output voltage swing is limited relative to the supply rails depending on the load resistance.

Is the AD8538 qualified for automotive applications?

The standard AD8538AUJZ-R2 is a commercial grade part. Automotive qualification is available for the AD8538W model series, which has controlled manufacturing for automotive reliability requirements.