LM2903N

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LM2903N, a differential input quad single-ended output comparator from Texas Instruments, is classified in linear-comparators. It is designed to sense small voltage differences when high accuracy is required. Its wide range of output types and power schemes facilitate microprocessor-based regulation and permit interfacing to logic levels.

The LM2903N has a typical propagation delay of 550 ns for the rising output, and 500 ns for the falling output. The noise immunity ensures that you won\'t get random switching from spurious inputs and noise. Additionally, the output is much more robust than traditional comparators, with a limit of 30 mVpp, less than one fifth of the traditional comparator.

The LM2903N has a quieter output than other comparators due to its low-noise levels. It has input hysteresis of 0.15 V, allowing for fast switching and improved suppression of power line noise and leakage. On the flip side, its slew rate of 0.2 ms turnover is quite slow and needs to be taken into consideration prior to application. In addition, the LM2903N has a wide supply voltage range of 2.7 V to 5.25 V, meaning it can be powered using various power sources.

In terms of applications, the LM2903N is used for many different types of applications. For example, it can be used in medical equipment, consumer products, and industrial automation. It has been incorporated into systems such as precision thyristor controllers, temperature sensors and controllers, and gas concentration sensors.

The working principle of LM2903N is quite simple and straightforward. When the difference between the two inputs exceed the reference level, the output of the comparator swings to a certain level, typically ground or +Vcc. Depending on the reference voltage level and the input signal, the output of the LM2903N can be high or low level. The reference voltage level, or input hysteresis, is programmed by an external resistor between the two input pins of the LM2903N.

In conclusion, the LM2903N from Texas Instruments is a low-power, high-precision comparator. Its wide input voltage range, faster output time, and high noise immunity make it suitable for a wide range of applications. Its working principle is based on the comparison of two input signals and the generation of a certain output status when the reference voltage level is exceeded. It is a great choice for precision control and response systems.

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