AD621BNZ

AD621BNZ Application Field and Working Principle

The AD621BNZ is an integrated circuit, a type of linear amplifier in the instrumentation, operational amplifier (OP amp), buffer amp category of electronics. This type of instrumentation amplifier is widely used in various industrial applications – mostly in consumer and industrial electronic equipment, such as medical devices, automotive systems and tracking systems, in addition to power management, audio systems, displays and more.

The AD621BNZ instrumentation amplifier is composed of two independent gain stages; a differential amplifier and a differential output stage. The differential amplifier is composed of two series differential inputs with matched characteristics that ensures high linearity throughout the entire gain range and has improved common-mode linearity at lower gains. An on-chip capacitor provides selection of the AC gain differential and provides adjustment of the high frequency cutoff. The differential output stage is used to provide single-ended output signals with high common-mode rejection ratio.

The gain range of the AD621BNZ can be easily adjusted using an external resistor divider network or an integrated trim potentiometer. The AD621BNZ has a gain range of up to 200dB with a adjustable AC and DC gain of up to 20dB. Low voltage operation (2.7V) is also supported. This makes it ideal for low power applications where high precision and high gain is required. The input offset voltage and offset current of the AD621BNZ are both low, and thus the amplifier can be used for both low level signals, such as microphone input, and high level signals, such as digital systems.

The AD621BNZ operates from a single power supply and is Rated for operation from 10V to 30V. It is also fully specified over the extended temperature range of -40°C to +85°C. The AD621BNZ can also be powered by a dual DC power supply based on its dual-output current mirror interface. Dual supplies are useful for larger input signals such as those found in automotive applications.

The AD621BNZ has numerous applications in instrumentation and data acquisition. It is used for measuring small signals such as temperature, pressure, and strain, where high accuracy and wide dynamic range are required. It is also used for high level signal amplification, medical measurement systems, and industrial control applications such as in motor drive circuits, flow or level controls and vibration sensing.

To summarise, the AD621BNZ instrumentation amplifier is an integrated circuit designed for instrumentation applications which require high precision, wide dynamic range, accurate input offset voltage, low noise, and a wide gain range. It operates with a single supply and is rated for operation from 10V to 30V with an extended temperature range of -40°C to +85°C. It has low input offset voltage and offset current, making it ideal for both low level and high level signals, and has a gain range of up to 200dB with adjustable AC and DC gain of up to 20dB. It is used for various instrumentation and data acquisition purposes including temperature, pressure, strain measurement, medical measurement systems, and industrial control applications.