AD8548ARZ-R7

Overview

The AD8548ARZ-R7 is a quad micropower, high input impedance operational amplifier from Analog Devices. It features rail-to-rail input and output (RRIO) capabilities, optimized for low power consumption and wide operating supply voltage ranges. The device operates on single supplies from 2.7 V to 18 V or dual supplies from ±1.35 V to ±9 V. Key electrical specifications include a maximum supply current of 22 μA per amplifier, a gain bandwidth product of 240 kHz, and a slew rate of 80 V/ms. It is specified over an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Rail-to-rail input and output functionality provides increased dynamic range for driving low-frequency data converters.
• Micropower consumption with a maximum supply current of 22 μA per amplifier across the full operating voltage range.
• High immunity to electromagnetic interference (EMI) ensuring stable operation in noisy environments.
• Unity-gain stability with CMOS architecture offering high input impedance and low input bias current.

Applications

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

Procurement Notes

Verify the specific ordering suffix R-7 indicates tape and reel packaging when sourcing this component. Confirm that the part number corresponds to the quad configuration (AD8548) rather than the dual version (AD8546). Ensure compatibility with the required SOIC-14 package footprint and check for RoHS compliance status as defined by the manufacturer's current production standards.

Selection Notes

Select this component for applications requiring low power dissipation and wide supply voltage flexibility. The RRIO feature makes it suitable for single-supply systems where maximizing signal swing is critical. Consider the 240 kHz bandwidth and 80 V/ms slew rate for moderate-speed signal conditioning tasks. Verify that the 22 μA quiescent current aligns with battery life requirements for portable designs.

Part Context

The AD8548ARZ-R7 belongs to the AD8546/AD8548 family of micropower operational amplifiers. This series is designed for battery-powered applications due to its low current consumption. The AD8548 variant specifically contains four independent amplifiers within a single 14-lead SOIC_N package, distinguishing it from the dual-channel AD8546.

Replacement Considerations

The AD8546 serves as the dual-channel counterpart within the same family. Other micropower RRIO amplifiers may be considered if pinout compatibility is not required, but direct substitution should verify matching electrical characteristics such as supply current and bandwidth.

FAQ

What is the input common-mode voltage range?

The input common-mode voltage range extends from the negative supply rail (V−) to the positive supply rail (V+), enabling true rail-to-rail input capability.

Is the AD8548 unity-gain stable?

Yes, the AD8548 is unity-gain stable, allowing it to be used in voltage follower configurations without risk of oscillation.