Quad low-power op-amp for signal conditioning in tight spaces
The Analog Devices AD8544ARZ-REEL7 is a quad general-purpose operational amplifier with rail-to-rail output, designed for applications where board space and power budget are constrained. Each of the four amplifiers draws 45 µA of supply current, making it a fit for multi-channel sensor interfaces, battery monitors, and portable instrumentation where every microamp counts. The 1 MHz gain-bandwidth product and 0.92 V/µs slew rate are enough for audio-band filtering, ADC drive, and low-speed control loops, while the 2.7 V to 5.5 V supply span lets it run from a single lithium cell or a regulated 3.3 V / 5 V rail.
At 180 µA total quiescent for all four amplifiers, this op-amp leaves headroom for the rest of the signal chain in a battery-powered design. The 30 mA output current per channel can drive moderate loads like a reference input or a small headphone, but the part is not intended for high-current line drivers. The low bias current of 4 pA suits high-impedance sources such as pH probes or photodiode transimpedance stages, though the 1 mV input offset means the designer should budget for a calibration step if sub-millivolt accuracy is needed.
The surface-mount package is compatible with reflow soldering; the ROHS3 compliance simplifies EU and global compliance.