AD8275BRMZ-RL

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AD8275BRMZ-RL application field and working principle

The AD8275BRMZ-RL is an analog signal conditioner designed to detect and amplify differential signals from bridge transducers, low-level sensors and various low-impedance voltage sources. As a high performance signal conditioner, it is used for interfacing low-earth-resistance signal sources to low-noise high-gain signal amplifiers, suitable for applications in industrial process control, instrumentation and data acquisition.

The device features a differential amplifier with a high input impedance and a low output impedance, a gain set resistor, a common-mode rejection circuit, a power amplifier and an isolation resistor connected together in an efficient and cost-effective package. The AD8275BRMZ-RL also includes an on-board charge pump voltage regulator to provide a regulated voltage to the analog signal conditioner, ensuring a reliable operation.

The characteristic feature of the AD8275BRMZ-RL which differs from other signal conditioners is its integrated common-mode rejection (CMR) circuit. This CMR circuit provides an intermediate stage which cancels any common-mode signal present at its input. This ensures that the output is equal to the differential signal amplified by the differential amplifier.

The gain of the signal conditioner is set by an external resistor connected between the GND and the OUT pins. The gain of the device is calculated by the formula:

Gain (dB) = 20log (100/Rg)

Where Rg denotes the resistance of the resistor connected between GND and OUT pins in ohms.

The AD8275BRMZ-RL comes with a wide band common mode rejection, high common-mode rejection, low noise and low power consumption features. It is also energy efficient and stable operation over temperature.

The AD8275BRMZ-RL is suitable for a variety of applications, such as in strain gauges, resistance temperature detectors and level sensors, where its wide input dynamic range, high-CMR, low-noise and low-power features make it an ideal solution for these applications.

The working principle of the AD8275BRMZ-RL is quite simple. The device amplifies the differential signal present between its two inputs while rejecting the common-mode component of the input signal. This is done by the integrated common-mode rejection (CMR) circuit. The CMR circuit provides an intermediate stage which cancels out any common-mode component of the signal present at its inputs. The gain of the device is set by an external resistor connected between GND and the OUT pins. The gain of the device is calculated by the formula:

Gain (dB) = 20log (100/Rg)

Where Rg denotes the resistance of the resistor connected between GND and OUT pins in ohms.

The output of the differential amplifier is then applied to a power amplifier to provide a low-impedance output signal. The output is then connected to an isolation resistor to protect the device from high voltages and electrical noise that might be present in the system. Finally, the output is connected to the load and the device is ready for operation.

In summary, the AD8275BRMZ-RL is an analog signal conditioner designed to amplify differential signals from bridge transducers, low-level sensors and various low-impedance voltage sources. It is suitable for a variety of applications in industrial process control, instrumentation and data acquisition due to its excellent common-mode rejection, low noise and low power characteristics. The device is based on the integration of a differential amplifier with a high input impedance and a low output impedance, a gain set resistor, a common-mode rejection circuit, a power amplifier and an isolation resistor.

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