LM2903DG

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The LM2903DG is part of the linear comparator family. Comparators, as opposed to operational amplifiers, compare two voltages and judge their relationship. The LM2903DG takes an input voltage of up to 18V and compares it with the voltage applied to its adjustable reference input, which can range from -1.2V to 8V. An open-collector output gives an indication of the comparison. If the input voltage is higher than the voltage at the reference input, the output is pulled to a low state. If the input voltage is lower than the reference voltage, the output is left open.

The LM2903DG\'s advanced design eliminates much of the hysteresis effect seen in standard comparators. This reduces the amount of noise generated when the two inputs switch over from one state to another. This advanced design also means that the comparator\'s oscillation threshold and maximum frequency limit are far higher than would normally be expected of a standard comparator. This makes the LM2903DG perfectly suited for applications such as frequency-hopping receivers, wiper-positioners, and motor speed controls.

The LM2903DG is designed to operate in a very low-power environment, which makes it particularly suitable for battery-powered applications. Its operating current is typically only 7 µA, and it can operate over a voltage range of 2V to 18V, ensuring compatibility with a wide range of available power sources.

The LM2903DG also features monitoring of its own internal power supply, which ensures that the comparator will switch off if the power supply drops below a predetermined threshold. This is particularly useful in battery-powered applications, ensuring that the device will not continue to draw power when the battery is almost fully discharged.

Due to its low power draw and high frequency limit, the LM2903DG is ideally suited for a wide range of applications that require reliable, long-lasting comparator performance. The comparator also includes a hysteresis adjustment, which can be used to tailor the output’s switching threshold. This allows for a further level of customization, and ensures that the comparator’s output is consistent, regardless of the input voltage.

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