AD8675ARZ

Overview

The AD8675ARZ is a single-channel precision operational amplifier manufactured by Analog Devices Inc. It features a 10 MHz gain bandwidth product and a 2.5 V/µs slew rate. The device operates on supply voltages ranging from ±5 V to ±18 V with a typical supply current of 2.9 mA. Key electrical specifications include a maximum input offset voltage of 75 µV, an input bias current of 2 nA, and a voltage noise density of 2.8 nV/√Hz at 1 kHz. It offers a common-mode rejection ratio of 130 dB and a power supply rejection ratio of 140 dB. The component supports rail-to-rail output swings and is housed in an 8-lead SOIC package.

Feature Summary

• Features proprietary nulling capability allowing external compensation for combined device and system offset errors up to 3.5 mV without affecting drift or rejection ratios.
• Provides rail-to-rail output swing while maintaining ultralow offset, drift, and voltage noise characteristics suitable for high-precision applications.
• Combines wide bandwidth with very low input bias current and low input current noise compared to other low-noise rail-to-rail amplifiers.

Applications

• Precision instrumentation
• PLL filters
• Laser diode control loops
• Strain gage amplifiers
• Medical instrumentation

Procurement Notes

Verify the specific package variant (SOIC-8) against the required footprint. Confirm RoHS compliance status as indicated by the Z suffix. Ensure supply sequencing guidelines are followed to prevent damage during power-up. Validate that the operating temperature range meets the environmental requirements of the target application.

Selection Notes

Select this component when high DC precision and low noise are critical alongside wide bandwidth. The availability of offset nulling pins distinguishes it from standard rail-to-rail op amps. Consider the extended industrial temperature range and the specific supply voltage requirements when designing the power stage.

Part Context

The AD8675ARZ belongs to the AD8675 series of ultra-precision, rail-to-rail output operational amplifiers. It shares core performance characteristics with the dual-channel AD8676. The family is designed to offer superior noise and precision metrics compared to industry-standard alternatives like the OP07 while providing wider bandwidth than traditional precision amplifiers.

Replacement Considerations

The AD8676 serves as the dual-channel equivalent within the same product family. Designers requiring a quad configuration should consult the AD8674 datasheet. Verify pin compatibility and thermal resistance values when substituting packages.

FAQ

How does the AD8675 handle offset voltage adjustments?

The device includes dedicated NULL pins (Pin 1 and Pin 8) that allow for external adjustment of both device and system offset errors up to 3.5 mV referred to the input, without adversely affecting offset drift, CMRR, or PSRR.

What is the input voltage range specification?

The input voltage range extends from −3.0 V to +3.0 V at ±5 V supplies and from −12.5 V to +12.5 V at ±15 V supplies, allowing operation close to the supply rails.