LM239AN

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LM239AN is a linear comparator, which functions like a voltage comparator employed in various circuits, including window detector and other various logic applications. It is designed to compare two voltage patterns and output a logic level high or low. It is composed of differential amplifier along with hysteresis to eliminate any output due to minor input voltage changes. The LM239AN has many advantages, which include high voltage gain with wide input common-mode range, high reliability and fast response. It is available with different functions, such as normal switching, differential input type and open collector output type.

The Application Field

The LM239AN was designed to be versatile and effective tool in a wide range of applications. It can be used for voltage comparison functions in any application where it requires a comparison of two voltage inputs. This includes comparators used to detect windowing and other logic applications. It can also be used to create oscillators or used in time delay circuits. Moreover, this application field is not limited to the above-mentioned roles as the LM239AN is built for a variety of variable applications. As such, its application fields include:

• Linear voltage comparators.
• Logic gates.
• Latch circuits.
• Time delay circuits.
• Detection of windowing signals.
• Oscillators.
• Security and alarm systems.

The Working Principle

The LM239AN operates resistant to common-mode bias voltage, which determines the maximum voltages that can be applied to the inputs. In a voltage comparator circuit, the voltage source will be connected to both inputs. The same source can be connected to the positive or negative input so that the other input will be at a higher or lower voltage than the one connected to it. When the voltage levels of the two inputs are identical, the output of the LM239AN will be high. When the two input levels differ, the LM239AN output will be low.

The LM239AN is composed of a differential amplifier with hysteresis, which is needed to eliminate any incorrect output due to the insignificant changes in input voltage. Technically, the circuit has a differential amplifier on the input and an output buffer amplifier on the output. The differential input voltage will be multiplied by the differential amplifier’s gain to create the output voltage. The hysteresis adds a positive feedback loop in order to cancel any noise signals.

The LM239AN can be used in many systems that require a comparison of two signals such as systems that detect windowing signals and alarm systems. With its wide range of applications and its capacity to eliminate noise signals, the LM239AN provides a robust and reliable solution when designing a voltage comparator, logics gates and latch circuits.

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