LTC6945IUFD#PBF

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The LTC6945IUFD#PBF is an integrated circuit with a broad range of applications in the clock/timing category. Specifically, it is a low-power, high-frequency clock generator, Programmable Frequency Synthesizer and Phase-Locked Loop (PLL) that High Performance Clock Solutions (HPCS) markets as the “Chronosynclast”. It is designed to enable significantly better timing synchronization in mobile devices such as smartphones, tablets and smart wearables.

The LTC6945IUFD#PBF is designed to provide a host of advantages including precision clocking, adaptive voltage control and superior output excess-noise cancellation. It is capable of generating clocks for a wide array of frequencies and formats, including LVDS, LVPECL, SONET/SDH, SONET/SDH/PDH and SPI. It can generate several clock outputs simultaneously with accurate frequency control, providing superior jitter immunity to data communications. Additionally, extremely low power consumption allows it to be used in battery operated and other low-power applications.

The underlying principle of operation of the LTC6945IUFD#PBF is a fractional-N frequency synthesizing loop implemented with a delta-sigma modulator. A multi-bit digital-to-analog converter (DAC) and voltage-controlled oscillator form the PLL input, and the modulator provides a programmable loop filter for frequency compensation. This enables the output to maintain a frequency for a wide range of VCO control voltages, which provides superior jitter suppression and low power consumption under varying nominal VCO frequencies.

The Chronosynclast also implements a range of advanced digital control and configuration features. These include an integrated non-volatile memory for frequency settings, an integrated configuration interface and an integrated digital-to-analog calibrator for automated frequency setting. Additionally, several self-test features are present for verifying the accuracy of the clock across multiple parameters.

In summary, the LTC6945IUFD#PBF is a versatile clock generator, PLL, and frequency synthesizer with a wide range of applications in the clock/timing space. Its combination of low power consumption, superior jitter suppression and advanced digital control features make it an excellent choice for mobile applications and other applications that depend on precision clocking and accurate timing.

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