LM748CN

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LM748CN Application Field and Working Principle

The LM748CN is a type of operational amplifier (op-amp) which falls into the linear amplifiers category known as instrumentation, op-amps, buffer amps, and more. It is an integrated semiconductor consisting of bipolar transistors, resistors, and diodes in a single package. The device is specifically designed to improve the performance of a variety of precision-oriented circuit operations, such as feedback loops, sensing operations, transducer amplifiers, and automatic gain control functions.

The LM748CN can be found in many industrial applications and has become a popular choice among engineers. Its most common uses include audio systems, industrial motor and motor control, laser and other optical systems, optical encoders, and closed-loop control systems. The op-amp is also known for its fairly low cost and reliability.

The LM748CN works by responding to input voltages and currents, amplifying these inputs and then providing a higher output to an output load. It does this by having two inputs, an inverting input and a non-inverting input. The non-inverting input (called the positive input) is connected to the output load, and the inverting input (called the negative input) is connected to the input signal from the sensor. When the input voltage potential is lower than the output voltage potential, the op-amp acts as an amplifier and outputs a higher voltage than the input, thus driving a load. Likewise, when the input voltage and current is greater than the output voltage, the op-amp acts as an attenuator and causes the output to have a lower voltage than the input.

The LM748CN possesses a wide range of features, such as high slew-rate, low input bias current, and high open-loop gain. Its power consumption is very low, and the op-amp can be operated at supply voltages as low as 3V. Furthermore, the input noise is minimal, and it has excellent voltage noise immunity, with a common-mode rejection of over 90dB at frequencies of up to 1MHz. Finally, the LM748CN has excellent power supply rejection, with over 70dB of rejection for changes in supply voltage.

In conclusion, the LM748CN is a highly versatile operational amplifier with many applications. It has excellent power supply rejection, low input bias current, and high open-loop gain. Furthermore, it has low power consumption, excellent voltage noise immunity, and high slew-rate. The LM748CN is well-suited for a wide range of industrial applications, including motor control, audio systems, laser systems, and closed-loop control systems.

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