AD8021ARZ-REEL7

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The AD8021ARZ-REEL7 is an ultra-low power, low voltage, current feedback amplifier. Its power consumption makes is a desirable choice for portable and battery powered systems; additionally, the rail-to-rail output supports input signals down to ground, ideal for supplies as low as 1.8V. The AD8021ARZ-REEL7 performance is achieved via differential input and output stages with transconductance stages having propriety Slew Rate Enhanced (SRE) architecture with a maximum slew rate of 10 V/µs.

Application Field

The AD8021ARZ-REEL7 find use in a variety of applications. Its low power consumption, higher than average voltage gains, low distortion, and wide supply range, make it suitable for a variety of signal and data processing circuits, such as operational amplifiers, microphone pre-amplifiers, instrumentation amplifiers, noise-cancelling circuits, and filter circuits. Additionally, its high precision, wide signal band, and low noise make it suitable for a variety of telecommunications and computing applications, such as signal buffers, signal isolators, and analog-to-digital and digital-to-analog converters. Finally, it may be used as an impedance converter for ultrasound-based medical imaging systems.

Working Principle

The AD8021ARZ-REEL7 is an operational amplifier with two inputs, non-inverting and inverting, and one output. These terminals are connected to external components that establish the feedback circuit – the Closed Loop Gain (CLG) – of the amplifier. The inverting input terminal is biased by a resistor connected to ground and allows amplification of an input signal. The non-inverting input terminal is biased with a resistor connected to the fixed voltage of the voltage divider connected to the supply voltage, allowing the input signal amplified according to the feedback parameters configured by the values of the resistors.

The output signal of the amplifier passes through an output stage, where it is buffered with an output transistor before being presented at the output terminal. The output stage of the AD8021ARZ-REEL7 features Slew Rate Enhanced (SRE) architecture, allowing a maximum slew rate of 10 V/µS. The SRE architecture ensures low distortion, good linearity, and controlled transient response, allowing for clean and sharp audio and video signals.

The AD8021ARZ-REEL7 achieves its low current consumption due to the usage of advanced process technologies, as well as low-threshold transistors and low dielectric breakdown voltage devices. Additionally, it also features a current generator circuit that reduces the amount of power needed to operate the amplifier.

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