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Linear - Comparators: MAX921CUA+ Application Field And Working Principle

A linear-comparator is an integrated circuit device which is used as a source of pulses of a fixed width from an input voltage in order to compare two voltages and generate an output. The MAX921CUA+ is a linear-comparator with an adjustable open-drain output configuration that provides an adjustable voltage reference. It is specifically designed for high-speed applications and is capable of providing high-amplitude, low-noise output pulses that readily adjust and tolerate varying input voltages.

Overview

The MAX921CUA+ provides a wide range of features to improve comparison accuracy and reduce noise. The open-drain output configuration offers no noise reduction, so it is ideal for applications where the differential input voltage must remain constant. The device also offers a high input-voltage range, from 5V to 15V, making it suitable for ±25V power supply applications common in telecom, automotive and industrial markets. It also offers adjustable thresholds for both rising and falling edges and a high output frequency range of up to 450kHz. Its wide temperature range and durable construction make it an ideal choice for embedded applications.

Working Principle

The MAX921CUA+ is designed for use as an adjustable linear-comparator. The comparator consists of two signal inputs, the voltage reference input (Vref) and the signal input (Vin). The comparator monitors the two inputs and compares their potential. When the potential of the two inputs are equal, the device will assert its output signal. The output signal is a pulse-width with a preset duration. This pulse-width ensures that the voltage difference between the two inputs is maintained and any resulting signal will remain stable.

The comparator also has an adjustable threshold level (THR), which sets the minimum difference between the two input voltages. This threshold is adjustable through the range of 5V to 15V. This allows for the comparator to identify the input signal values for which its output will trigger. The output of the comparator will remain low until the voltage level of the signal voltage rises above the threshold level set. When the signal voltage rises above the threshold, the output will switch to a high state and remain in that state until the signal voltage drops back below the threshold level.

Application Field

The MAX921CUA+ is commonly used in a wide range of industrial and consumer applications. In industrial applications, the comparator is used to create a level triggering point for a variety of devices. It is used in process control systems, to monitor a switching status of devices, to control process variation, to detect level changes and for pulse width modulation. In consumer applications, it is used to detect position, movement and speed in circuit boards and for microprocessor implementation. It is also commonly used in automotive applications for monitoring power supply and cooling systems.

Conclusion

The MAX921CUA+ provides reliable, adjustable and low-noise pulse-width output from an input voltage. Its wide input voltage range and adjustable threshold level makes it an ideal choice for use as a linear-comparator operator in a wide range of consumer and industrial applications. It is suitable for use in telecom, automotive and industrial markets where an adjustable voltage reference may be used. Moreover, its wide temperature range and rugged construction make it an ideal choice for embedded applications.

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