CY22801KFXC

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The CY22801KFXC is a frequency synthesizer capable of creating reliable, low-noise clock signals. It integrates 18 MHz crystal oscillator, a phase-locked loop (PLL) circuit, programmable dividers, clock switches and level translators into one integrated circuit. It is designed to generate low-noise clock signals over a wide frequency range while providing a wide flexibility in the configuration of its inputs and outputs.

The CY22801KFXC is primarily intended for use in high-power and high-sensitivity communications and applications. It is mostly used in mobile telecommunications, wireless sensors and embedded system applications. The PLL of the CY22801KFXC can produce a variety of frequencies for wireless transmitters, wireless receivers, data converters, base station systems, handsets, optics gear and other communications equipment.

The working principle of the CY22801KFXC is based on the phase-locked loop (PLL). A PLL is essentially a feedback control system that uses the output of its phase detector to adjust the frequency of its reference oscillator (or free-running oscillator). With the CY22801KFXC, the reference oscillator is programmed to operate at a fixed frequency of 18MHz. The feedback control system then adjusts the speed of the PLL to generate a precisely accurate output frequency.

The CY22801KFXC features an integrated phase-locked loop (PLL) circuit and a clock switch. The PLL circuit is used to produce a variety of clock frequencies from its 18MHz crystal oscillator reference. The clock switch enables the device to switch between two clock sources for its synchronous operation. The CLK_EXT input pin serves as an additional input for a user-provided reference clock. The CLK_OUT pin provides a clock frequency programmed by the user, which can be used as the system master clock, or as a reference clock for other components.

The PLL circuit also includes programmable dividers, which are used to divide down the clock frequency and produce a precise required output frequency. The clock output is selectable between two frequency ranges, thus providing the user with a large range of choices. The chip\'s integrated series resistance load allows the device to drive multiple outputs with a high degree of accuracy while providing very low power consumption.

In addition to its PLL circuit and clock switch, the CY22801KFXC also features a programmable low-power sleep and shutdown modes, a low-noise EMI filter and level translators. The low-power sleep mode reduces the device power consumption to 3uA, while the shutdown mode reduces it to 0.1uA, making the device ideal for low power applications. The level translators enable the chip to output a low-noise signal with level shifting capacitively, providing a superior solution for applications that require low-noise transfer of signals between different voltage domains.

Overall, the CY22801KFXC is a highly integrated and versatile device, capable of generating reliable and low-noise clock signals over a wide frequency range. Its integrated PLL, clock switch, level translators, low-power sleep and shutdown modes, EMI filter and 18MHz reference oscillator, provide the user with a great degree of flexibility when configuring its inputs and outputs. This makes the CY22801KFXC an ideal choice for high-power, high-sensitivity communications and applications.

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