LM358APT

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LM358APT Application Field and Working Principle

The LM358APT is a dual operational amplifier integrated circuit made by National Semiconductor. It is an eight-pin device with a quiescent current of only 1.5mA making it an ideal amplifier for low-power applications. The device is cheaper and more compact than competitors and provides excellent temperature stability, low distortion, and high Slew Rate.

Types of Applications

The LM358APT has several applications ranging from general-purpose amplification to specific circuits. It can be used as an audio amplifier for amplifying low-level signals for audio components such as speakers, microphones, and mixers. It is also suitable for use in test equipment and medical instruments where precision and accuracy are required. Additionally, with the high slew rate of 10V/μs, the LM358APT can be used for driving dc motors. Furthermore, its dual amplifier allows for more capabilities such as difference amplifiers, current-to-voltage converters, and low-frequency oscillators.

Working Principle

The LM358APT consists of two operational amplifiers in one device. An operational amplifier is a DC-coupled, high-gain electronic voltage amplifier composed of one input terminal, two output terminals, and two voltage-controlled feedback networks. The output voltage of an operational amplifier is determined by the differences between the two inputs. The amplifiers gain is set by the feedback resistance.

The LM358APT contains two amplifiers each with its own power supply connection (VCC). All the pins are electrically connected, allowing the two amplifiers to work in either a single or dual mode. When in single mode, the device operates just like any other single-supply amplifier. In dual mode, one amplifier is kept at a low voltage while the other is held at a higher voltage. The amplifier with the higher voltage is referred to as the “high-output” and the other is referred to as the “low-input”. By having the two amplifiers working in dual mode with different power supplies, it allows for better noise dampening, higher impedance levels, and improved dynamic range.

Conclusion

The LM358APT is a versatile operational amplifier. It offers excellent performance in a wide range of applications, from general-purpose amplification to specific circuits. Its dual amplifiers provide improved noise dampening, higher impedance levels, and improved dynamic range. The device is inexpensive, yet offers great temperature stability, low distortion, and high Slew Rate. The LM358APT is an ideal solution for low-power applications.

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