NJM2520D

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The NJM2520D is an integrated circuit specially designed to act as a resistor-capacitor (RC) filter, a building block in electronic audio systems. It is a voltage-controlled low-pass filter designed to attenuate frequencies higher than the cutoff frequency and leave lower frequencies unaffected. It is broadly used in audio special purpose applications to shape, or filter, the frequency content of a signal.

The NJM2520D is popular because of its simple and effective design. It requires minimal external components to control cutoff frequencies, as only two external resistors and one external capacitor are necessary. It is also low-noise and low-distortion due to its large supply voltage and high current capacity. Additionally, the filter can be implemented in a variety of circuits such as single- and multiple-pole lower, band-pass, and high-pass filter topologies.

The working principle of the NJM2520D is based on an active voltage-controlled RC filter topology. This topology provides a high gain, low distortion, and adjustable cutoff frequency which is determined by the ratio of the external resistors.The NJM2520D uses two external resistor ratios to control the high- and low-frequency performance of the filter. By adjusting the resistor ratio, it is possible to control gain and phase response of the filter. The external capacitor adjusts the amount of filtering, providing additional control over the frequency content of a signal.

The NJM2520D is commonly used in audio special purpose applications such as equalizers, limiters, and noise reduction systems. It is also used as a pre- or post-filter stage in loudspeakers, headphones, and other audio transducers. Additionally, due to its ability to eliminate high-frequency noise, it is also well suited for use in communication and broadcast systems.

In conclusion, the NJM2520D is an integrated circuit used in audio special purpose applications as an RC filter with adjustable frequency response. It can be used to shape or filter the frequency content of a signal and is used in a variety of applications including equalizers, limiters, and noise reduction systems. It is also popular for its low-noise and low-distortion as well as its simple and effective design requiring only minimal external components.

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