LM239DRG4

The LM239DRG4 is a quad voltage comparator from the National Semiconductor series of integrated circuits. It is a low power linear comparison device suitable for timing, sensing, level detection, pulse generation, frequency division and pulse shaping applications. The LM239DRG4 is specified for a wide range of operating conditions, either DC or AC. It has a wide range of operating voltages, from 3.0 volts up to 30 volts.

The LM239DRG4 has four comparators in one package. It also has two logic outputs and two reference inputs. The logic outputs indicate if the voltage at their corresponding reference inputs are higher or lower than the reference input. The logic outputs can be configured to be open or closed. The LM239DRG4 also has an input protection against over voltage.

The LM239DRG4 is divided into two sections, namely the input/output section, where the inputs and outputs are connected, and the operational amplifier section, which drives the comparators. The operational amplifier is a non-inverting amplifier made up of four cascading transistors. This circuit controls the gain, offset, and current. It regulates the voltage across the comparator and can be used to create a wide range of gains.

A typical application of the LM239DRG4 is in level sensing. Two resistors can be connected to each reference input and one end of the resistor connected to the reference input. The LM239DRG4 can then be used to detect when a signal passes below or above a certain level set by the reference input. The open collector logic outputs indicate if the voltage is higher or lower than the reference input.

Another application of the LM239DRG4 is in frequency division and pulse shaping. This can be achieved with the use of the two reference inputs and the open collector logic outputs. The input signals can be divided by the ratio of the two reference voltages and the open collector output will indicate the state of the signal (high low or inverted).

The LM239DRG4 is a versatile device, suitable for a variety of noise, logic, and timing applications. Its wide range of operating voltages combined with its input protection, make it an ideal choice for applications that require high accuracy. The LM239DRG4 is a reliable and cost-effective solution for linear comparison applications.