AD8544ARZ

Overview

The AD8544ARZ is a quad-channel CMOS operational amplifier featuring rail-to-rail input and output capabilities. It operates on a single supply voltage ranging from 2.7 V to 5.5 V with a typical supply current of 45 µA per amplifier. The device provides a gain bandwidth product of 1 MHz, an input offset voltage of 1 mV, and an input bias current of 4 pA. It supports a maximum output current of 30 mA per channel and functions within an extended industrial temperature range of -40°C to +125°C.

Feature Summary

• Rail-to-rail input and output operation for maximizing dynamic range in low-voltage systems
• Extremely low power consumption of 45 µA per amplifier ideal for battery-powered applications
• High input impedance with very low input bias currents suitable for high-impedance sources
• No phase reversal during large signal transitions

Applications

• ASIC input or output buffering
• Sensor interfaces
• Piezoelectric transducer amplifiers
• Photodiode amplifiers
• Active filters and gain stages

Procurement Notes

Verify the specific package variant against project requirements, as the AD8544 series includes both SOIC and TSSOP options. Confirm that the standard commercial grade meets all environmental specifications, noting that automotive-grade variants carry a distinct 'W' suffix. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structure.

Selection Notes

Select this component when designing single-supply systems requiring full signal swing near ground and the positive rail. The low quiescent current makes it superior to older generation parts for portable devices. Verify that the 1 MHz bandwidth and slew rate meet the signal processing speed requirements. Consider the 4 pA input bias current for applications involving high source impedances or capacitive sensors.

Part Context

The AD8544ARZ belongs to the AD854x family of general-purpose amplifiers manufactured by Analog Devices Inc. This family includes single (AD8541), dual (AD8542), and quad (AD8544) configurations sharing identical electrical characteristics. The ARZ suffix indicates a lead-free, RoHS-compliant part housed in a 14-lead narrow SOIC package.

Replacement Considerations

The AD8544ARUZ serves as a direct pin-compatible alternative utilizing a 14-lead TSSOP package instead of the SOIC form factor.