LM393MX

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LM393MX Application Field and Working Principle

The LM393MX is a dual comparator from Texas Instruments, an integrated circuit (IC) used for comparing two input signals

Introduction

This device belongs to Linear- Comparators ICs family, which is designed as one of the most basic comparators. The LM393MX is designed to operate with a minimum amount of external parts such as resistors and capacitors. This IC is usually used in voltage or current measurement, or any other application that needs two input signals to be compared.

Features

The LM393MX is a dual-channel device, which means it can handle two input signals at the same time. It also has power-down capability, which allows the device to be shut down completely in order to conserve energy. The LM393MX also features an internal voltage reference, which eliminates the need for external voltage references.

Comparator Operation

The operation of the LM393MX is quite simple. The two input signals are compared to determine which one is larger or smaller than the other. Generally, this comparison is made between two voltages or two currents. Depending on which one is larger, the output of the comparison is either a logic “high” (voltage greater than reference) or logic “low” (voltage lower than reference).

Common Uses

The LM393MX is most commonly used in voltage or current measurements, as well as other applications requiring two input signals to be compared. It is also used in various motor control applications, such as motor speed control or servo motor control.

Applications

The LM393MX can be used in various applications, such as:

• Measuring voltage or current.
• Low-cost current sensing.
• Audio level detection.
• Contact detection.
• Motor speed control.
• Servo motor control.
• Pulse-width modulation.

Pin Descriptions

The LM393MX has eight pins. These pins are numbered 1 to 8 as seen in the pin diagram. Their function is explained below:

• Pin 1 (VCC): This is the power supply pin, which supplies the operating power to the IC.
• Pin 2 (Ground): This is the ground pin, which connects the IC to the ground of the circuit.
• Pin 3 (Non-Inverting Input): This is the non-inverting input of the comparator.
• Pin 4 (Inverting Input): This is the inverting input of the comparator.
• Pin 5 (Reverse Output): This is the reverse output of the comparator, which is active when the non-inverting input voltage is higher.
• Pin 6 (Reference Input): This is the reference input of the comparator. It sets the point of comparison between the two input signals.
• Pin 7 (Forward Output): This is the forward output of the comparator, which is active when the inverting input voltage is higher.
• Pin 8 (Supply Voltage): This is the supply voltage pin, which supplies the voltage to the IC.

Working Principle

The working principle of the LM393MX is that it compares the two input signals and produces an output depending on which one is greater. The voltage of the reference input sets the point of comparison between the two input signals. When the non-inverting input voltage is higher than the inverting input voltage, the output is high, and vice versa.

Conclusion

The LM393MX is a popular choice for applications that require two input signals to be compared. It is a reliable and low-cost solution for voltage and current measurements, as well as other applications such as motor speed control or servo motor control. With its eight pins and a relatively simple working principle, the LM393MX can be used in many different applications.

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