LM339ADG4

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Linear - Comparators

The LM339ADG4 is a Linear - Comparator, commonly used in electronic applications where flip-flop and relay systems are used. Comparators are operational amplifiers specifically packaged and designed to provide a direct output to discrete logic or flip-flop circuitry upon comparison of two input signals. LM339ADG4 is a single channel device with an operating range of +3V to +30V, and can be used as high speed, single supply, low power Schmitt trigger. It also offers CPU and RAM protection, as well as system reset functionalities.

Working Principle

The LM339ADG4 uses two independent voltage comparators to compare two independent input signals. The output of the comparator will be either logic high or logic low, depending on whether the voltage present on one of the inputs is greater than that present on the other input. The differential input voltage should be between 0V and 30V, and the output will be between 0V and 5V. If a third input is provided and it is at a voltage greater than a preset reference voltage, the output will be logic low.

The comparator can operate with an input voltage between 0 and +30V, and it will respond immediately to the input voltage regardless of the input current. This is possible because it has an open loop gain of 1000, which is much higher than that of a conventional operational amplifier. This open loop gain means that any change in the input voltage will be immediately reflected in the output voltage, regardless of the bias current. The output will have a switching time of less than 15 microseconds, with a rise time of 6 microseconds and a fall time of 8 microseconds.

Application Field

The LM339ADG4 can be used in a wide variety of applications. It is typically used in high speed, low power analog-to-digital systems, and is also suitable for CPU and RAM protection, as well as black out detection. It can also be used in automotive electronics applications, such as spark ignition and airbag sensors. Other applications include proximity sensing, battery monitoring, and instrument auto-test systems. Additionally, it can be used in noise-immune applications such as EMI filters, logic controllers, and data transmission.

Whether you’re looking for fast-responding, low-power, single-supply comparator solutions, the LM339ADG4 provides an ideal solution. It offers an open loop gain of 1000, making it one of the most reliable comparators available. Make sure to choose the right supply voltage, input voltage range, and output types for your application.

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