AD8548ARZ

Overview

The AD8548ARZ is a quad micropower, high input impedance CMOS operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output (RRIO) capabilities and operates on supply voltages ranging from 2.7 V to 18 V single-supply or ±1.35 V to ±9 V dual-supply. The device draws a maximum of 22 μA per amplifier at 18 V. Key electrical specifications include a gain bandwidth product of 240 kHz, a slew rate of 80 V/ms, an input bias current of 20 pA maximum, and an offset voltage of 3 mV maximum. It is housed in a 14-lead SOIC_N package and rated for operation between -40°C and +125°C.

Feature Summary

• Rail-to-rail input and output functionality provides increased dynamic range for driving low-frequency data converters.
• Micropower consumption optimized for wide operating supply voltage ranges with minimal current draw.
• High immunity to electromagnetic interference ensures stable performance in noisy environments.
• Unity-gain stability combined with high input impedance suitable for buffering high-impedance sources.

Applications

• Portable medical equipment
• Remote sensors
• Transimpedance amplifiers
• Current monitors
• 4 mA to 20 mA loop drivers

Procurement Notes

Verify the specific ordering suffix 'RZ' against the manufacturer's official documentation to confirm RoHS compliance status and lead-free packaging details. Ensure the selected package variant matches the required PCB footprint, as the AD8548 family includes different pin configurations such as the dual-channel MSOP version. Cross-reference the datasheet revision history to confirm that all electrical characteristics align with the intended design requirements before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring low power consumption alongside wide supply voltage flexibility. The quad configuration makes it efficient for multi-channel signal conditioning tasks where space is limited. Consider the rail-to-rail input/output capability if the application demands maximizing dynamic range near the supply rails. Verify that the 240 kHz bandwidth meets the frequency response needs of the target sensor signals.

Part Context

The AD8548ARZ belongs to the AD8546/AD8548 series of micropower operational amplifiers designed for battery-powered applications. While the AD8546 offers a dual-channel configuration in an 8-lead MSOP package, the AD8548 provides four channels in a 14-lead SOIC_N package. Both share identical electrical characteristics and are optimized for low power and high input impedance in portable devices.

Replacement Considerations

The AD8546ARMZ serves as a dual-channel alternative within the same family, sharing identical electrical specifications but differing in channel count and package type.

FAQ

What is the typical input bias current for the AD8548ARZ?

The typical input bias current is 5 pA at 25°C, with a maximum specification of 20 pA under standard conditions.

Does the AD8548ARZ require a shutdown pin?

No, the AD8548ARZ does not feature a shutdown pin; it operates continuously once powered within its specified voltage range.