HMC783LP6CETR

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HMC783LP6CETR is an example of a specialized clock/timing IC, which can be broadly grouped into clock generators, Phase Locked Loops (PLLs) and frequency synthesizers. It is heavily used in 4G/5G Small Cell applications, and is available as a 6-Output Programmable Clock Generator (PCG), a 6-Output dithered digital clock driver, and a 6-Output high impedance digital clock driver.

HMC783LP6CETR has multi-mode electronic switching, allowing different clock frequencies and various output types of the same frequency. This programmable clock generator is designed to support the 4G/5G Small Cell’s clock architecture and replaces the current Multi-Frequency Clock (MFC) devices. It provides a versatile, yet highly integrated solution to meet the needs of the demanding wireless infrastructure market.

The HMC783LP6CETR is equipped with a large library of multiplication modes and frequency combinations, thereby enabling an optimized system clock architecture. Moreover, in certain applications, the device can be programmed to provide a powerful jitter attenuation function when used as an oscillator circuit.

The device contains a Phase Locked Loop (PLL) frequency synthesizer that can be programmed to generate nearly any frequency up to 500 MHz, as well as a range of output formats such as CMOS, LVDS, and LVPECL. Each PLL within the device is comprised of a Voltage Controlled Oscillator (VCO) and a charge pump for loop control. The VCO produces a reference clock frequency that is a multiple of the system reference frequency. The charge pump in the loop locks the reference clock frequency to an external reference (system reference clock).

The device\'s function as a frequency synthesizer is enabled by the selection of an appropriate pre-divider ratio. The pre-divider ratio means that the output frequency is multipled by a factor. The pre-divider ratio can be programmed to a value of up to 8, which increases the flexibility and range of frequencies that the device can generate. Additionally, the phase adjust register can be used to vary the phase of the synthesized clock signals with respect to the system reference clock. This feature can be used to precisely synchronize multiple clock signals.

The device also provides a range of other features, such as programmable output impedance, programmable slew rate and programmable output current drive, which can be used to optimize the output signals for various applications. Furthermore, the device provides an on-chip temperature compensation feature, which can be used to reduce the effects of temperature variations on clock performance.

As a digital clock driver, the HMC783LP6CETR is capable of driving low voltage digital signals such as LVDS, LVPECL, CMOS and SSTL. The device has a dither mode, which aggregates multiple clocking frequencies to produce a single output, thus enabling a more robust clock output. The digital clock driver also supports a slew rate control and output impedance selection, providing a variety of programmable options.

The high impedance digital clock driver feature in the HMC783LP6CETR provides up to 6 bidirectional outputs, enabling them to be used in clock switching applications. This feature is useful in applications that require flexible switching capabilities such as when transitioning between multiple system clocks.

In summary, the HMC783LP6CETR is specifically designed to address the requirement of the 4G/5G Small Cell market. It is equipped with a wide range of features, such as a large library of frequency combinations, multifunctional electronic switching, programmable pre-divider ratios and more, making it an ideal choice for clock architectures in 4G/5G Small Cells.

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