HMC724LC3TR-R5

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The HMC724LC3TR-R5 is a two output, low power clock synthesizer IC, designed especially to fulfill stringent timing requirements with the clock outputs from an HCSL source. The device features a fast lock time and low power operation in an 8-lead MSOP package.

The HMC724LC3TR-R5 belongs to the clock/timing family of Clock Buffers, Drivers. It is used for low phase-noise operations to produce a low power clock outputs with low spreads of skew. The device can down spread the original PLL output frequency from 1GHz to a value as low as 25. It also serves as a source for wideband signals whose frequency can be adjusted by programming the PLL frequency divider through the control inputs.

The application fields are mainly in communication and clock generation in high-speed digital systems. It can also be used in systems such as synthesizers, timing circuits and crystal oscillators.

In terms of working principle, the HMC724LC3TR-R5 consists of two main components: a phase-locked loop (PLL) and a frequency-locked loop (FLL). The PLL consists of a voltage-controlled oscillator (VCO) and a charge pump circuit which enables the frequency, pulse width and pulse shapes to be modulated. The FLL is used for the tracking of reference frequency, which is typically provided by an external crystal oscillator. The low power consumption and the fast settling time make it suitable for applications such as real-time clock generation in power limited systems.

The HMC724LC3TR-R5 features a zero-delay buffer which enables the VCO output to be buffered and properly synchronized before being output as the clock signal. This zero-delay provides a more precise clock output than other types of IC clocks as the zero-delay does not introduce extra jitter on the output.

The device also allows for the clock frequency to be changed dynamically by programming the PLL frequency divider through the control inputs. This means that the device can be used in applications where the clock frequency needs to be adjusted automatically.

In addition, the HMC724LC3TR-R5 also provides two output distributions circuits, which allow the two independent clock outputs to synchronize and maintain a constant phase and frequency relationship. This ensures that both outputs remain in tight synchronization even if the clock frequencies are varied independently.

The HMC724LC3TR-R5 is a great choice for communications, timing and clock generation applications that require low phase-noise, fast lock time and low power operation.

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