AD621BRZ

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The AD621BRZ is a high-precision general-purpose instrumentation amplifier with excellent accuracy and stable performance. This amplifier offers a wide range of capabilities that make it suitable for use in a variety of applications in industrial, scientific and medical fields.

Application Field

The AD621BRZ is an optimal solution for a wide range of applications, such as precision monitoring, control and data acquisition system, low-frequency strain gage instrumentation, medical equipment, portable instrumentation and test equipment.

The AD621BRZ can also be used in a variety of medical instrumentation systems, including patient monitoring, vital sign measurement and patient care medicine. Portable diagnostic equipment is also one of its most suitable application field. The low power consumption, small package size and low drift makes it a great choice for portable instrumentation.

The AD621BRZ is also commonly used in industrial processes. Its fast settling time, low power supply current and high open loop gain make it an ideal choice for industrial process and control. Its low power consumption and small size make it suitable for battery-operated systems and small embedded systems.

Working Principle

The AD621BRZ is an inverting (negative feedback) type instrumentation amplifier. It consists of two differential input amplifiers and a gain-setting resistor network (R1, R2 and R3). An internal buffer amplifier provides an additional gain and reduces the output impedance. A precision bandgap reference is used to provide low offset and temperature drift.

When there is a differential input voltage between the input terminals (IN1 and IN2), the differential amplifier amplifies this voltage and generates an output voltage that is proportional to the differential input voltage. The gain-setting resistor network (R1, R2 and R3) drives the output voltage to the output port (OUT). The internal buffer amplifier amplifies this output voltage and reduces the output impedance. This reduces the load on the output and increases the signal-to-noise ratio of the amplifier.

The precision bandgap reference is used to provide a low offset of the amplifier outputs. This reference is internally connected to the inverting input terminal of the gain-setting resistor network. The voltage of the reference changes slightly with respect to temperature. The main benefit of this reference is that it reduces the offset and drift of the instrumentation amplifier even at different temperatures.

In summary, the AD621BRZ is a high-precision instrumentation amplifier with excellent accuracy, wide range of applications and stable performance. Its low power consumption, low drift and flexible gain settings make it suitable for a wide range of industrial, scientific and medical applications.

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