LT1218CN8#PBF

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LT1218CN8#PBF Application Field and Working Principle

The LT1218CN8#PBF is an amplifier module integrated with a voltage buffer, connected to a signal source like a microphone, used to match input and output impedance while driving a low power device. It is specifically designed for durable, reliable, and high-performance audio applications within the field of linear-amplifiers, instrumentations, and buffer amps.

Structure of LT1218CN8#PBF Amplifier

The LT1218CN8#PBF amplifier is made up of four sub-circuits - Input, Gain, Output and Supply. The Input and Output sub-circuits are connected to each other on the middle of the circuit, thus forming a buffer amplifier. The input sub-circuit is a voltage buffer which is used to maintain an even impedance between the signal source and the output sub-circuit. The Gain sub-circuit is a differential amplifier, which is used to boost the input signal to a higher voltage level. The output sub-circuit is connected to the gain sub-circuit and provides the output of the amplifier. The Supply sub-circuit is used to supply the other sub-circuits with the necessary power.

Supply Sub-Circuit

The LT1218CN8#PBF is designed to operate on an external supply voltage of +2.2V to +18V. A conventional bipolar power supply is used as the power source. The power supply needs to be capable of providing enough energy to keep the input and output sub-circuits running and maintaining a constant voltage level at the output.

Input Sub-Circuit

The input sub-circuit is a voltage buffer which is connected to the signal source like a microphone or instrument. It provides a very high input impedance of 100K ohms, which allows it to drive a low power device, like a speaker, without being affected by the load. The input sub-circuit also offers a very low distortion (THD) of 0.02%.

Gain Sub-Circuit

The Gain sub-circuit is a differential amplifier, which is used to boost the input signal to a higher voltage level. It is connected to the power supply and provides a gain of 9.3dB (1V/V). The internal Gain sub-circuit also offers an Input Noise Voltage of -99dBu, which provides a very low distortion level of 0.005%.

Output Sub-Circuit

The Output sub-circuit is used to provide the amplified signal to the output (speaker). It provides a very low output impedance level, which means that it can drive a low power device without being affected by the load. It also offers a very low distortion (THD) of 0.005%. The output sub-circuit is connected to the supply sub-circuit and supplies the necessary power.

Uses of LT1218CN8#PBF Amplifier

The LT1218CN8#PBF amplifier is mainly used for audio applications like amplifying microphones, instruments and receivers. It is also used in automotive audio systems as a buffer amplifier for reducing background noise and increasing signal-to-noise ratio. The buffer amplifier can also be used in other linear-amplifiers, instruments and buffer amps for signal conditioning and matching input and output impedances.

Conclusion

The LT1218CN8#PBF amplifier is especially designed for audio applications within the field of linear-amplifiers, instrumentation, and buffer amps. It is made up of four sub-circuits which form the buffer amplifier and is powered by an external source. The input sub-circuit provides a very high input impedance level, the gain sub-circuit provides a gain of 9.3dB (1V/V), the output sub-circuit drives a low power device, and the supply sub-circuit provides the necessary power. The LT1218CN8#PBF is mainly used for amplifying microphones, instruments and receivers and in automotive audio systems as a buffer amplifier.

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