LT1468CDD-2#PBF

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LT1468CDD-2#PBF Application Field and Working Principle

The LT1468CDD-2#PBF is a dual, low-noise, low-distortion, variable gain amplifier with low dropout voltage, which can be used in a wide range of instrumentation, OP amps, buffer amps, and audio applications. This amplifier works with or without current-sense feedback, depending on the design choice. Voltage gain is adjustable from 0.5 to 4.5, with 0.5 dB steps, resulting in a low noise figure of 0.7 nV/√Hz and a flat response at the specified 1 kHz gain. The LT1468CDD-2#PBF is characterized for operation over a temperature range of –40°C to 85°C.

The working principle of the LT1468CDD-2#PBF is based on active transimpedance conversion, which uses the outputs of the two amplifiers to modulate the gain in the differential mode of operation. The amplified signal is then amplified with a differential transconductance amplifier. The transconductance amplifier offers a wide range of results and can adjust gain over a wide range of levels. This system offers minimal distortion, and the feedback loop ensures stability at any gain level. The chip is powered by a 5V supply with a max voltage of 14V.

The LT1468CDD-2#PBF has two inputs and two outputs to enable differential input and output in applications. The input can be DC or AC coupled and has an adjustable gain, which gives the amplifier a large range of uses. It is also designed for high bandwidth and low distortion, making it suitable for audio applications such as amplifying signals from microphone preamplifiers, headphone amplifiers, and speaker amplifiers. The amplifier can also be used in analogue-to-digital applications, where precision and accuracy is required.

For instrumentation, the LT1468CDD-2#PBF can be used for measuring and controlling. The adjustable gain is extremely useful for controlling the input voltage for various applications. It is also useful for low-noise operation, as adjustable gain can be used to control the output noise. For example, in a voltage regulation system, adjustable gain is used to control the output current and noise. Additionally, this amplifier can be used in high-impedance, capacitively coupled circuits, where an adjustable gain gives stability while controlling the voltage levels.

In OP amps, buffer amps, and audio applications, the LT1468CDD-2#PBF can be used as a driver between two high-impedance amplifiers, allowing it to act as a buffer. It can also be used as an amplifier for high-precision, low-level signals, for example in audio mixing and preamplifying. It can also be used as a voltage follower, which maintains the same voltage as the input signal, but with lower noise and distortion than a standard follower.

The LT1468CDD-2#PBF uses an advanced design to ensure fast turn-on time, high power supply rejection ratio, ultra-low distortion, and very low noise. The amplifier is robust and reliable for a wide range of applications and provides an excellent performance for instrumentation, OP amps, buffer amps, and audio applications.

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