AD8644ARU

Overview

The AD8644ARU is a quad, single-supply operational amplifier manufactured by Analog Devices Inc. It features a 5.5 MHz unity-gain bandwidth and a 7.5 V/μs slew rate. The device operates on supply voltages from 5 V to 18 V with a typical supply current of 800 μA per amplifier. It provides rail-to-rail input and output capabilities, an offset voltage of 1.0 mV, and an output short-circuit current of 70 mA. The component is housed in a 14-lead TSSOP package and functions within a temperature range of –20°C to +85°C.

Feature Summary

• Rail-to-rail inputs and outputs for maximum dynamic range
• High capacitive load drive stability
• Immunity to output phase reversal
• Low supply current consumption

Applications

• LCD gamma and VCOM drivers
• Modems
• Portable instrumentation
• Direct access arrangement circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and RoHS compliance status. Ensure that the procurement channel sources components directly from authorized distributors or the manufacturer to guarantee authenticity and traceability. Cross-reference the part number with the latest datasheet revision to confirm electrical specifications match the intended design requirements.

Selection Notes

Select this component when a quad configuration is required for space-constrained designs utilizing the 14-lead TSSOP package. It is suitable for applications demanding high output current capability and stable operation with large capacitive loads. Consider its single-supply operation range and low power consumption for battery-powered or densely packed portable systems requiring rail-to-rail signal swing.

Part Context

This component belongs to the AD8614/AD8644 family of single and quad 18 V operational amplifiers. These devices are processed using the Analog Devices HV XFCB process, which utilizes trench-isolated transistors to lower internal parasitic capacitance. This technology improves gain bandwidth, phase margin, and capacitive load drive performance compared to standard bipolar processes.

Replacement Considerations

The AD8614 serves as the single-channel equivalent within the same product family.

FAQ

Does the AD8644 include built-in output short-circuit protection?

No, the device does not have built-in short-circuit protection. Shorting the output directly can destroy the device, although it can typically withstand up to 70 mA.

How does the AD8644 handle input overvoltage conditions?

The device includes 1.5 kΩ resistors in series with each input to limit current during overvoltage events. If the input exceeds the supply rails by more than 0.6 V, internal junctions energize to protect the device.