AD8609ARUZ

Overview

The AD8609ARUZ is a quad precision micro-power operational amplifier from Analog Devices, featuring rail-to-rail input and output capabilities. It utilizes a patented trimming technique to achieve superior precision without laser adjustment. The device operates on single supplies from 1.8 V to 5 V or dual supplies from ±0.9 V to ±2.5 V. Key electrical characteristics include a maximum offset voltage of 50 µV, a maximum input bias current of 1 pA, and a supply current of 40 µA per amplifier. It offers a gain bandwidth product of 400 kHz and unity gain stability.

Feature Summary

• Patented trimming technique achieves superior precision without laser adjustment
• Rail-to-rail input and output swing capability for wide dynamic range
• Unity gain stable with no phase reversal even under overdrive conditions
• Micro-power consumption suitable for battery-operated systems

Applications

• Battery-powered instrumentation
• Multipole filters
• Capacitive and inductive sensors
• Low power ASIC input or output amplifiers
• Photodiode transimpedance amplifiers

Procurement Notes

Verify the specific ordering suffix RUZ corresponds to the 14-lead TSSOP package variant. Confirm RoHS compliance status indicated by the Z suffix. Ensure the selected packing quantity matches project requirements, as reel options vary. Check for any recent revision changes in the datasheet that might affect pinout or electrical specifications.

Selection Notes

Select this component when high DC precision and low noise are required in space-constrained portable designs. The quad configuration reduces board area compared to single-channel alternatives. Consider the 14-lead TSSOP package for its thermal performance and footprint efficiency relative to SOIC variants. Evaluate the 400 kHz bandwidth against signal frequency requirements.

Part Context

The AD8609ARUZ belongs to the AD8603/AD8607/AD8609 family of precision CMOS operational amplifiers. This series shares core technologies including low offset voltage, low noise, and micro-power operation. The AD8609 specifically provides four independent amplifiers in one package, distinguishing it from the single-channel AD8603 and dual-channel AD8607 within the same product line.

Replacement Considerations

Official substitutes within the same family include the AD8609ARZ in the 14-lead SOIC package. Designers may also consider the AD8609ARUZ-REEL for tape-and-reel packaging needs. Cross-family replacements require verification of pin compatibility and electrical parameter alignment.

FAQ

Does the AD8609 exhibit phase reversal when the input voltage exceeds the common-mode range?

No, the AD8609 does not exhibit phase reversal. It can handle input voltages up to 1 V beyond the supply rails without inverting the output phase.

What is the maximum input bias current specification for the AD8609?

The maximum input bias current is 1 pA at 25°C. This value increases to 50 pA over the extended temperature range of -40°C to +85°C and 500 pA up to +125°C.

Is the AD8609ARUZ unity gain stable?

Yes, the AD8609 is unity gain stable, allowing it to be used in voltage follower configurations without risk of oscillation.