LM139DRG4

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LM139DRG4 is a common type of linear comparator. It is divided into two versions, low power (LM139) and high power (LM339). It is the standard CMOS dual general-purpose comparator, which can be used in power supplies, regulators, analog / digital converters and other circuits.

It is mainly used to compare two analog signals, or compare a signal with a reference voltage. When the voltage of one input is greater than the other, the output state is high, otherwise it is low and the output transitions.

LM139DRG4 mainly adopts integrated circuit, is formed by CMOS structure and the output is TTL compatible structure, the power consumption is very low. Combining with differential input stage, the bias current is extremely low.

In addition, LM139DRG4 also has large common mode input voltage range, and can cover ground. The open collector output state can be connected to other open collector or open drain output. Other features such as hysteresis (also called offset) and feedforward compensation are also available.

LM139DRG4 has wide application fields and can be used for motor control, switch mode power supply protection and regulation, as well as other applications that require comparison of two signals. The operating principle of LM139DRG4 is simple and straightforward. It compares two input signals to determine which one is greater and drives the output accordingly.

It can also help compare two input signals, one generated by an oscillator and the other from outside of the system. This can be used to determine whether an oscillator is at the correct frequency, for example.

The device includes hysteresis which helps to assure reliable "on-off" switching of the output and eliminates any bouncing when the input voltage is near the two voltage limits defining the hysteresis band. This is adjusted by connecting a resistor between the two comparator input pins.

In summary, LM139DRG4 is a reliable dual comparator device with wide application fields, low power consumption, large common mode input voltage range, hysteresis and open collector output state. It is used to compare two analog signals, or compare a signal with a reference voltage, and helps to determine whether an oscillator is at the correct frequency.

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