LM393ADT

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Comparator circuits are widely used in many non-linear applications. LM393ADT is a dual differential comparator that is widely used in various applications such as Amplifiers, Sign Detectors, Zero-Crossing Detectors, Automatic Gain Control, Automatic Frequency Control, and Limiters. This article will discuss the application fields and working principle of LM393ADT.

Features of LM393ADT

The LM393ADT is an industry-standard dual differential comparator, which contains two independent voltage comparators. This chip has voltage input levels of -2V and 2V, and the supply voltage used can be up to 20V. The low input offset voltage (<1mV) and low biased current (<100nA) provide excellent accuracy and precision. The high maximum output current (20mA) provides enough power to drive LED display circuits or devices that require a high current load. The chip is also designed with a low propagation delay time (15ns), providing fast detection of voltage changes within the input range. This makes it especially suitable for high-speed switching applications.

Application Fields of LM393ADT

The LM393ADT is widely used in Amplifiers, Sign Detectors, Zero-Crossing Detectors, and Automatic Gain Control, Automatic Frequency Control, and Limiters. The LM393ADT is used as an amplifier because of its low input offset voltage and low bias current. It is used to amplify the small signals received from the detectors into a more useful form. It is also used in sign detectors where it detects the change in the sign of the input, for example, from +1 to -1. With the aid of a window comparator, a sign detector can be used to detect the sign change and then activate an output.[/3] Moreover, in applications such as Automatic Gain Control and Automatic Frequency Control, the LM393ADT comparator can detect the fluctuations in the signal and then adjust the gain or frequency accordingly. Finally, the LM393ADT can be used as a limiter, which is a function of a comparator that prevents output signals from exceeding a predetermined amplitude.

Working Principle of LM393ADT

The LM393ADT comparator works by comparing two input voltages, one positive (V+) and one negative (V-). The internal circuitry compares these two voltages, and when the input of negative voltage (V-) is higher than the positive one (V+), the output of the comparator goes high and it becomes saturated. Then the output returns back to low when the input of negative voltage (V-) is lower than the positive voltage (V+). By doing this comparison, the LM393ADT can detect the sign changes of the input voltages and then output an appropriate signal.

In comparison to other conventional comparators, the LM393ADT has another advantage which is the presence of an enable pin. This pin allows the user to control the power consumed by the comparator. When the enable pin is low, the comparator remains in low power mode and when the pin is set high, the comparator turns on and works according to the input signals.

Conclusion

LM393ADT is an excellent choice of comparator for many non-linear applications, due to its low input offset voltage, low bias current, and fast response time. Its main application fields are Amplifiers, Sign Detectors, Zero-Crossing Detectors, Automatic Gain Control, Automatic Frequency Control, and Limiters. It works by comparing two input voltages and when the negative voltage is higher than the positive voltage, it outputs a signal. The enable pin of the LM393ADT allows the user to control the power consumption of the comparator.

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