LX5553LU

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RF Front End (LNA + PA)

The LX5553LU IC is a RoHS compliant Single Conversion Tuner IC that is primarily used in digital satellite and cable set-top boxes. It includes a low noise amplifier (LNA), a phase locked loop (PLL) frequency synthesizer, and a power amplifier (PA). It offers excellent performance over a wide frequency range, and it has a wide dynamic range, high linearity, low power consumption, and low cost.

Application Field

The LX5553LU is designed for digital satellite and cable set-top box applications. It can also be used in applications such as digital television broadcasting, terrestrial digital broadcasting, cable television, and satellite radio reception. Additionally, it can be used in automotive audio applications such as in-dash head units.

Working Principle

The LX5553LU IC works in the following way. First, it receives signals from a satellite or cable system. These signals are then amplified by the LNA stage to increase the signal strength. Next, the signal is mixed with an external reference signal in the PLL stage. The mixed signal is then passed through a digital filter in order to extract the wanted frequencies and reject the unwanted ones. Finally, the filtered signal is amplified by the PA stage and sent out to the consumer device.

The LX5553LU offers excellent performance over a wide frequency range, and it has a wide dynamic range, high linearity, low power consumption, and low cost. Additionally, it features on-chip temperature compensated power control, which allows it to be used in applications that require high levels of accuracy.

In conclusion, the LX5553LU is a RoHS compliant Single Conversion Tuner IC that is mainly used in digital satellite and cable set-top boxes. It includes an LNA, a PLL frequency synthesizer, and a PA, and it offers excellent performance over a wide frequency range, and it has a wide dynamic range, high linearity, low power consumption, and low cost.

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